CN117145792A

CN117145792A - Fan abnormal sound detection method and fan abnormal sound detection system

Info

Publication number: CN117145792A
Application number: CN202310146410.6A
Authority: CN
Inventors: 李永杰; 陈仕彬; 贺军; 孔荣荣
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2023-02-07
Filing date: 2023-02-07
Publication date: 2023-12-01
Also published as: CN117759553A

Abstract

The embodiment of the application provides a method and a system for detecting abnormal sound of a fan, which are applied to the technical field of testing. According to the method, a fan control module is used for controlling a cooling fan to sequentially operate at a plurality of different preset rotating speeds, when the cooling fan operates at each preset rotating speed, a driving mechanism drives the cooling fan and at least one recording element on a test bottom plate to synchronously rotate to a plurality of different rotating angles, when the cooling fan and the at least one recording element synchronously rotate to each rotating angle, at least one recording element collects sound source signals of the cooling fan once, and a different sound detection module detects whether different sounds exist in the cooling fan according to each sound source signal. Therefore, the possibility that the abnormal sound is excited in the detection process of the radiating fan with the abnormal sound can be improved, and the consistency of sound source signals acquired by the recording element under different rotation angles of the radiating fan is improved, so that the accuracy of the abnormal sound detection result of the radiating fan is improved.

Description

Fan abnormal sound detection method and fan abnormal sound detection system

Technical Field

The present application relates to the field of testing technologies, and in particular, to a method and a system for detecting abnormal sound of a fan.

Background

With the continuous development of electronic technology, electronic devices such as notebook computers are becoming a relatively common tool in life and work of people. Certain heat can be generated in the running process of electronic equipment such as a notebook computer and the like, and in order to timely discharge the generated heat into the outside air, a cooling fan can be arranged in some electronic equipment to cool.

The heat dissipation fan may have some defects in the processing and assembling processes, and the defective heat dissipation fan may generate abnormal sounds in the running process, so that a bad visual feeling is brought to consumers. Therefore, how to screen out the heat dissipation fan without abnormal noise is a problem to be solved.

Disclosure of Invention

The embodiment of the application provides a method and a system for detecting abnormal sound of a fan, which are used for collecting sound source signals of the cooling fan when the cooling fan runs at a plurality of different preset rotating speeds and the cooling fan and at least one recording element synchronously rotate to a plurality of different rotating angles, so that the accuracy of abnormal sound detection results of the cooling fan is improved.

In a first aspect, an embodiment of the present application provides a method for detecting abnormal sound of a fan, which is applied to a system for detecting abnormal sound of a fan, where the system for detecting abnormal sound of a fan includes a sound source collecting device and an abnormal sound detecting module, the sound source collecting device includes a driving mechanism, a test base plate, at least one recording element and a fan control module, the driving mechanism is connected with the test base plate and the at least one recording element, a radiator fan is fixed on the test base plate, the fan control module is electrically connected with the radiator fan, and the at least one recording element is electrically connected with the abnormal sound detecting module. The method comprises the following steps: the fan control module controls the cooling fan to sequentially run at a plurality of different preset rotating speeds; under the condition that the cooling fan runs at each preset rotating speed, the driving mechanism drives the cooling fan and at least one recording element on the test bottom plate to synchronously rotate to a plurality of different rotating angles; under the condition that the cooling fan runs at each preset rotating speed and the cooling fan and at least one recording element synchronously rotate to each rotating angle, the at least one recording element collects sound source signals of the cooling fan once; at least one recording element transmits each acquired sound source signal to a different sound detection module; the abnormal sound detection module detects whether the heat dissipation fan has abnormal sound or not according to each sound source signal.

Therefore, compared with a manual detection mode, the embodiment of the application adopts the recording element to collect the sound source signal in the running process of the cooling fan, and analyzes the sound source signal through the abnormal sound detection module to automatically detect whether the cooling fan has abnormal sound, and in the detection process, the influence of the environmental noise and subjective factors of detection personnel is smaller, so that the accuracy of the abnormal sound detection result of the cooling fan can be improved, and the abnormal sound detection efficiency of the cooling fan can be improved. In addition, compared with a recording element fixedly arranged in the sound insulation box for collecting sound source signals when the cooling fan runs at different rotation angles so as to detect abnormal sound of the cooling fan, the embodiment of the application adopts the recording element to collect the sound source signals of the cooling fan at a plurality of different preset rotation speeds and a plurality of different rotation angles, and the cooling fan runs at a plurality of different preset rotation speeds, so that the possibility that the cooling fan with abnormal sound is excited in the detection process can be improved, and the accuracy of the abnormal sound detection result of the cooling fan is improved; when the cooling fan rotates to a plurality of different rotation angles, the recording element and the cooling fan synchronously rotate, so that the angle and the relative position between the cooling fan and the recording element are not changed when the cooling fan rotates to the different rotation angles, the consistency of sound source signals collected by the recording element can be improved under the different rotation angles of the cooling fan, and the accuracy of abnormal sound detection results of the cooling fan is improved.

In one possible implementation manner, the abnormal sound detection module detects whether the abnormal sound exists in the cooling fan according to each sound source signal, including: the abnormal sound detection module calculates the average spectral kurtosis and the average spectral peak value of each sound source signal; the abnormal sound detection module calculates the sound pressure level of each sound source signal; the abnormal sound detection module determines whether the abnormal sound exists in the cooling fan according to the average spectral kurtosis, the average spectral peak value and the sound pressure level of each sound source signal. In this way, the embodiment of the application considers the corresponding sound pressure level of the sound source signal of the cooling fan, and introduces the average spectrum kurtosis and the average spectrum peak value, namely, the average spectrum kurtosis, the average spectrum peak value and the sound pressure level are adopted to judge whether the cooling fan has abnormal sound or not, so that the interception rate of abnormal sound detection of the cooling fan is improved, the over-killing rate of abnormal sound detection of the cooling fan is reduced, and the accuracy of the abnormal sound detection result of the cooling fan is improved only in one step.

In one possible implementation, the alien detection module calculates an average spectral kurtosis and an average spectral peak for each of the sound source signals, including: the abnormal sound detection module carries out band-pass filtering processing on each sound source signal; the abnormal sound detection module performs Fourier transform on each sound source signal subjected to band-pass filtering processing to obtain a frequency spectrum corresponding to each sound source signal; the abnormal sound detection module extracts a frequency band to be analyzed in a frequency spectrum corresponding to each sound source signal; and the abnormal sound detection module calculates and obtains the average spectral kurtosis and the average spectral peak value of each sound source signal according to the frequency band to be analyzed corresponding to each sound source signal.

In one possible implementation, the frequency band to be analyzed includes a plurality of frequency multiplication frequency bands corresponding to the frequency conversion of the cooling fan. The abnormal sound detection module calculates and obtains the average spectral kurtosis and the average spectral peak value of each sound source signal according to the frequency band to be analyzed corresponding to each sound source signal, and the abnormal sound detection module comprises: the abnormal sound detection module calculates the spectral kurtosis and the spectral peak value corresponding to each frequency multiplication frequency band included in the frequency band to be analyzed corresponding to each sound source signal; the abnormal sound detection module calculates an average value of frequency spectrum kurtosis corresponding to a plurality of frequency multiplication frequency bands included in a frequency band to be analyzed corresponding to each sound source signal, and obtains the average frequency spectrum kurtosis of each sound source signal; the abnormal sound detection module calculates the average value of the frequency spectrum peak values corresponding to the multiple frequency multiplication frequency bands in the frequency bands to be analyzed corresponding to each sound source signal, and obtains the average frequency spectrum peak value of each sound source signal. Therefore, since the corresponding sound source signals of the failed cooling fan generate a plurality of frequency multiplication components with frequency conversion after Fourier transformation, based on analysis of the frequency bands to be analyzed in the frequency spectrum corresponding to each sound source signal, the average spectral kurtosis and the average spectral peak value are calculated, and whether abnormal sound exists in the cooling fan can be determined more accurately.

In one possible implementation, the abnormal sound detection module calculates a sound pressure level of each sound source signal, including: the abnormal sound detection module carries out high-pass filtering processing on each sound source signal; the abnormal sound detection module adopts a human ear auditory model to carry out filtering treatment on each sound source signal after the high-pass filtering treatment; the abnormal sound detection module calculates the sound pressure level of each sound source signal after filtering processing by adopting the human ear auditory model. In this way, since the correlation between the abnormal sound and the frequency conversion of some cooling fans is smaller, but the sound pressure level of the high frequency band is greatly different, the sound pressure level of the high frequency band is used as another part of detection index for judging whether the abnormal sound exists in the cooling fans, so that whether the abnormal sound exists in the cooling fans can be more accurately determined.

In one possible implementation, the abnormal sound detection module calculates a sound pressure level of each sound source signal after filtering with the human ear auditory model, including: the abnormal sound detection module calculates a sampling value corresponding to each sound source signal after filtering processing by adopting the human ear auditory model, and products of the sampling value and the reference voltage of analog-digital conversion to obtain a voltage value corresponding to each sound source signal; the abnormal sound detection module calculates a voltage value corresponding to each sound source signal and a ratio of the voltage value to the sensitivity of the recording element to obtain the sound pressure of each sound source signal; the abnormal sound detection module calculates the sound pressure level of each sound source signal according to the following formula: spl=20×lg (P _e /P _ref ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein SPL represents the sound pressure level of each sound source signal, P _e Representing the sound pressure of each sound source signal, P _ref Representing a reference sound pressure.

In one possible implementation manner, the abnormal sound detection module determines whether the abnormal sound exists in the cooling fan according to the average spectral kurtosis, the average spectral peak value and the sound pressure level of each sound source signal, and includes: when the average spectral kurtosis of each sound source signal is smaller than the spectral kurtosis threshold, the average spectral peak value of each sound source signal is smaller than the spectral peak value threshold, and the sound pressure level of each sound source signal is smaller than the sound pressure level threshold, the abnormal sound detection module determines that the heat dissipation fan does not have abnormal sound; when the average spectral kurtosis of the at least one sound source signal is greater than or equal to a spectral kurtosis threshold, and/or the average spectral peak of the at least one sound source signal is greater than or equal to a spectral peak threshold, and/or the sound pressure level of the at least one sound source signal is greater than or equal to a sound pressure level threshold, the abnormal sound detection module determines that the heat dissipation fan has abnormal sound. In this way, the average spectral kurtosis, the average spectral peak value and the sound pressure level of the sound source signal are respectively compared with the corresponding thresholds to judge whether the abnormal sound exists in the cooling fan, so that the interception rate of abnormal sound detection of the cooling fan is improved, the over-killing rate of abnormal sound detection of the cooling fan is reduced, and the accuracy of the abnormal sound detection result of the cooling fan is improved only in one step.

In one possible implementation manner, the fan control module includes an upper controller, a voltage output module and a counter module, where the upper controller is electrically connected with the voltage output module and the counter module respectively, and the voltage output module and the counter module are also electrically connected with the cooling fan. The fan control module controls the cooling fan to run at a plurality of different preset rotating speeds in sequence, and the fan control module comprises: the upper controller sends a control signal to the voltage output module; the voltage output module provides a voltage signal for the cooling fan according to the control signal, and the voltage signal is used for driving the cooling fan to operate; the counter module detects the fan rotating speed in the running process of the cooling fan and sends the fan rotating speed to the upper controller; the upper controller calculates the rotation speed deviation between the rotation speed of the fan and the preset rotation speed; the upper controller determines a voltage compensation value according to the rotation speed deviation; the upper controller adjusts a control signal sent to the voltage output module according to the voltage compensation value, so as to adjust a voltage signal provided by the voltage output module to the cooling fan, and the adjusted voltage signal is used for adjusting the fan rotating speed in the running process of the cooling fan to a preset rotating speed. Therefore, the upper controller, the voltage output module and the counter module are adopted to carry out closed-loop control on the fan rotating speed of the cooling fan, so that the fan rotating speed of the cooling fan can be accurately controlled, and the stability of abnormal sound detection of the cooling fan is improved.

In one possible implementation, the at least one recording element includes a first recording element and a second recording element, the first recording element and the second recording element being respectively located on opposite sides of the test floor; the plurality of different preset rotational speeds comprise a first preset rotational speed and a second preset rotational speed, wherein the first preset rotational speed is 4000+/-50 rpm, and the second preset rotational speed is 2500+/-50 rpm; the plurality of different rotation angles includes a first rotation angle of 0 °, a second rotation angle of 90 °, and a third rotation angle of 180 °.

In a second aspect, an embodiment of the present application provides a system for detecting abnormal sound of a fan, including a sound source collecting device and an abnormal sound detecting module, where the sound source collecting device includes a driving mechanism, a testing base plate, at least one recording element and a fan control module, the driving mechanism is connected with the testing base plate and the at least one recording element, a cooling fan is fixed on the testing base plate, the fan control module is electrically connected with the cooling fan, and the at least one recording element is electrically connected with the abnormal sound detecting module. The fan control module is used for controlling the cooling fan to sequentially run at a plurality of different preset rotating speeds; the driving mechanism is used for driving the cooling fan and at least one recording element on the test bottom plate to synchronously rotate to a plurality of different rotation angles under the condition that the cooling fan runs at each preset rotation speed; the sound source signal of the cooling fan is collected once under the condition that the cooling fan runs at each preset rotating speed and the cooling fan and the sound source signal of the cooling fan synchronously rotate to each rotating angle; the recording element is also used for sending each acquired sound source signal to the abnormal sound detection module; and the abnormal sound detection module is used for detecting whether the abnormal sound exists in the cooling fan according to each sound source signal.

In one possible implementation manner, the abnormal sound detection module is specifically configured to: calculating the average spectral kurtosis and the average spectral peak value of each sound source signal; calculating the sound pressure level of each sound source signal; and determining whether the heat radiation fan has abnormal sound according to the average spectral kurtosis, the average spectral peak value and the sound pressure level of each sound source signal.

In one possible implementation manner, the abnormal sound detection module is specifically configured to: carrying out band-pass filtering processing on each sound source signal; performing Fourier transform on each sound source signal subjected to band-pass filtering treatment to obtain a frequency spectrum corresponding to each sound source signal; extracting a frequency band to be analyzed in a frequency spectrum corresponding to each sound source signal; and calculating to obtain the average spectral kurtosis and the average spectral peak value of each sound source signal according to the frequency band to be analyzed corresponding to each sound source signal.

In one possible implementation, the frequency band to be analyzed includes a plurality of frequency multiplication frequency bands corresponding to the frequency conversion of the cooling fan. The abnormal sound detection module is specifically used for: calculating the spectral kurtosis and the spectral peak value corresponding to each frequency multiplication frequency band in the frequency band to be analyzed corresponding to each sound source signal; calculating an average value of the spectral kurtosis corresponding to a plurality of frequency doubling frequency bands in the frequency bands to be analyzed corresponding to each audio signal, and obtaining the average spectral kurtosis of each audio signal; and calculating the average value of the frequency spectrum peak values corresponding to the multiple frequency multiplication frequency bands in the frequency bands to be analyzed corresponding to each sound source signal, and obtaining the average frequency spectrum peak value of each sound source signal.

In one possible implementation manner, the abnormal sound detection module is specifically configured to: performing high-pass filtering processing on each sound source signal; each sound source signal after the high-pass filtering processing is subjected to filtering processing by adopting a human ear auditory model; and calculating the sound pressure level of each sound source signal after filtering processing by adopting the human ear auditory model.

In one possible implementation manner, the abnormal sound detection module is specifically configured to: calculating a sampling value corresponding to each sound source signal after filtering processing by adopting the human ear auditory model, and multiplying the sampling value by the reference voltage of analog-to-digital conversion to obtain a voltage value corresponding to each sound source signal; calculating the voltage value corresponding to each sound source signal and the ratio of the voltage value to the sensitivity of the recording element to obtain each soundSound pressure of the source signal; the sound pressure level of each sound source signal is calculated by the following formula: spl=20×lg (P _e /P _ref ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein SPL represents the sound pressure level of each sound source signal, P _e Representing the sound pressure of each sound source signal, P _ref Representing a reference sound pressure.

In one possible implementation manner, the abnormal sound detection module is specifically configured to: when the average spectral kurtosis of each sound source signal is smaller than the spectral kurtosis threshold, the average spectral peak value of each sound source signal is smaller than the spectral peak value threshold, and the sound pressure level of each sound source signal is smaller than the sound pressure level threshold, determining that no abnormal sound exists in the cooling fan; and determining that the heat radiation fan has abnormal sound when the average spectral kurtosis of the at least one sound source signal is greater than or equal to a spectral kurtosis threshold, and/or the average spectral peak of the at least one sound source signal is greater than or equal to a spectral peak threshold, and/or the sound pressure level of the at least one sound source signal is greater than or equal to a sound pressure level threshold.

In one possible implementation manner, the fan control module includes an upper controller, a voltage output module and a counter module, where the upper controller is electrically connected with the voltage output module and the counter module respectively, and the voltage output module and the counter module are also electrically connected with the cooling fan. The upper controller is used for sending a control signal to the voltage output module; the voltage output module is used for providing a voltage signal for the cooling fan according to the control signal, and the voltage signal is used for driving the cooling fan to operate; the counter module is used for detecting the rotating speed of the fan in the running process of the cooling fan and sending the rotating speed of the fan to the upper controller; the upper controller is also used for calculating the rotation speed deviation between the rotation speed of the fan and the preset rotation speed; the upper controller is also used for determining a voltage compensation value according to the rotation speed deviation; the upper controller is also used for adjusting a control signal sent to the voltage output module according to the voltage compensation value, so as to adjust a voltage signal provided by the voltage output module to the cooling fan, and the adjusted voltage signal is used for adjusting the fan rotating speed in the running process of the cooling fan to a preset rotating speed.

The effects of each possible implementation manner of the second aspect are similar to those of the first aspect and the possible designs of the first aspect, and are not described herein.

Drawings

Fig. 1 is a schematic structural diagram of a fan abnormal sound detection system according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a sound source acquisition device according to an embodiment of the present application;

fig. 3 is a schematic perspective view of a sound source collection device according to an embodiment of the present application under one view angle;

fig. 4 is a partial enlarged view of the fixing bracket and the test base plate in the sound source collecting device according to the embodiment of the present application;

FIG. 5 is a schematic diagram of a fan control module according to the related art;

FIG. 6 is a schematic diagram of a fan control module according to an embodiment of the present application;

fig. 7 is a flowchart of a method for detecting abnormal sound of a fan according to an embodiment of the present application;

FIG. 8 is a flowchart of a sound recording element for collecting sound source signals of a radiator fan according to an embodiment of the present application;

fig. 9 is a flowchart of detecting whether there is an abnormal sound in the cooling fan by the abnormal sound detection module according to the sound source signal in the embodiment of the present application.

Detailed Description

In order to clearly describe the technical solution of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", etc. are used to distinguish the same item or similar items having substantially the same function and effect. For example, the first chip and the second chip are merely for distinguishing different chips, and the order of the different chips is not limited. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.

It should be noted that, in the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural.

With the continuous development of electronic technology, electronic devices such as notebook computers are becoming a relatively common tool in life and work of people. In the operation process of electronic devices such as notebook computers, devices (such as a processor) arranged in the electronic devices can generate certain heat, and particularly in a high-load scene, the electronic devices can generate a large amount of heat. If the heat cannot be timely discharged into the outside air, the performance of devices such as a processor may be reduced, and in severe cases, the devices such as the processor may be damaged or the service life may be reduced.

Therefore, in order to timely discharge heat generated by the electronic devices into the air outside, some electronic devices may be provided with a heat dissipation fan for dissipating heat. In this way, the speed of the air flow is enhanced by the rotation of the heat radiation fan to accelerate the discharge of the heat generated by the electronic device into the air of the outside.

If the defective cooling fans are installed in the electronic equipment, the defective cooling fans also operate during the operation of the electronic equipment, so that abnormal sounds may be generated during the operation of the defective cooling fans, and bad visual feelings are brought to consumers. Therefore, before the heat radiation fan is mounted in the electronic device, it is necessary to perform abnormal sound detection on the heat radiation fan to intercept the heat radiation fan having abnormal sound, thereby screening out the heat radiation fan having no abnormal sound.

In some related arts, the abnormal sound detection of the heat radiation fan may be performed by a manual detection method. Specifically, the inspector holds the cooling fan in the running process and places the cooling fan on the ear side of the inspector, and the inspector listens to the sound in the running process of the cooling fan to judge whether abnormal sound exists in the cooling fan.

However, this manual detection method can lead to auditory fatigue of the detection personnel when the detection personnel listens to the sound in the running process of the cooling fan for a long time, which can affect the subjective judgment of the detection personnel on the abnormal sound detection result of the cooling fan, and the detection can also be affected by environmental noise, that is, the manual detection method is greatly affected by the environmental noise and the subjective factors of the detection personnel, thereby affecting the accuracy of the abnormal sound detection result of the cooling fan. In addition, the manual detection mode has the problem of lower detection efficiency.

In other related art, the cooling fan may be disposed in the sound insulation box, and a recording element is disposed in the sound insulation box to collect the sound source signal. In the abnormal sound detection process of the radiator fan, the radiator fan can be controlled to rotate to different rotation angles, sound source signals of the radiator fan when the radiator fan runs at different rotation angles are collected by the recording element, and the sound source signals of the radiator fan are analyzed by the software system to detect whether abnormal sound exists in the radiator fan.

However, in this detection mode, the heat dissipation fan is operated at a single rotation speed, and abnormal noise of the heat dissipation fan may not be excited at the single rotation speed, so that the heat dissipation fan with abnormal noise may occur, and the abnormal noise cannot be detected in the detection process, thereby affecting the accuracy of the abnormal noise detection result of the heat dissipation fan. In addition, the recording element is arranged at the fixed position of the sound insulation box in the detection mode, so that when the radiating fan rotates to different rotation angles, the angle and the relative position between the radiating fan and the recording element can be changed, and therefore the consistency of sound source signals collected by the recording element can be influenced, and the accuracy of abnormal sound detection results of the radiating fan can be further influenced.

Based on this, the embodiment of the application provides a fan abnormal sound detection method and a fan abnormal sound detection system, a fan control module controls a radiator fan to sequentially operate at a plurality of different preset rotating speeds, a driving mechanism drives the radiator fan and at least one recording element on a test base plate to synchronously rotate to a plurality of different rotating angles under the condition that the radiator fan operates at each preset rotating speed, and the radiator fan and the at least one recording element synchronously rotate to each rotating angle, at least one recording element collects sound source signals of the radiator fan once and sends the sound source signals to an abnormal sound detection module, and the abnormal sound detection module detects whether the radiator fan has abnormal sound according to each sound source signal.

Therefore, compared with a manual detection mode, the embodiment of the application adopts the recording element to collect the sound source signal in the running process of the cooling fan, and analyzes the sound source signal through the abnormal sound detection module to automatically detect whether the cooling fan has abnormal sound, and in the detection process, the influence of the environmental noise and subjective factors of detection personnel is smaller, so that the accuracy of the abnormal sound detection result of the cooling fan can be improved, and the abnormal sound detection efficiency of the cooling fan can be improved.

In addition, compared with a recording element fixedly arranged in the sound insulation box for collecting sound source signals when the cooling fan runs at different rotation angles so as to detect abnormal sound of the cooling fan, the embodiment of the application adopts the recording element to collect the sound source signals of the cooling fan at a plurality of different preset rotation speeds and a plurality of different rotation angles, and the cooling fan runs at a plurality of different preset rotation speeds, so that the possibility that the cooling fan with abnormal sound is excited in the detection process can be improved, and the accuracy of abnormal sound detection results of the cooling fan is improved. And, radiator fan is rotatory to the rotatory when a plurality of different rotation angles, recording element and radiator fan are synchronous rotation for when radiator fan is rotatory to different rotation angles, angle and relative position between radiator fan and the recording element all can not change, and it can improve radiator fan under different rotation angles, the uniformity of the sound source signal that recording element gathered, thereby improves radiator fan's abnormal sound testing result's accuracy.

It can be understood that the cooling fan in the embodiment of the present application may be a cooling fan to be installed in a notebook computer, and of course, the cooling fan in the embodiment of the present application may also be a cooling fan in other electronic devices, such as a cooling fan in a desktop computer, and the embodiment of the present application does not limit a specific device configuration of an electronic device to which the cooling fan is applied.

In order to better understand the embodiments of the present application, the following describes in detail a method and a system for detecting abnormal sound of a fan according to embodiments of the present application, where the method for detecting abnormal sound of a fan may be applied to the system for detecting abnormal sound of a fan.

Exemplary, fig. 1 is a schematic structural diagram of a fan abnormal sound detection system according to an embodiment of the present application. Referring to fig. 1, the abnormal sound detection system of the fan includes a sound source collecting device 110 and an abnormal sound detection module 120. The sound source collecting device 110 comprises a driving mechanism 111, a testing bottom plate 112, at least one recording element 113 and a fan control module 114, wherein the driving mechanism 111 is respectively connected with the testing bottom plate 112 and the at least one recording element 113, a cooling fan 200 is fixed on the testing bottom plate 112, the fan control module 114 is electrically connected with the cooling fan 200, and the at least one recording element 113 is electrically connected with the abnormal sound detection module 120.

The fan control module 114 is configured to control the cooling fan 200 to sequentially operate at a plurality of different preset rotational speeds. The driving mechanism 111 is used for driving the cooling fan 200 and the at least one recording element 113 on the test base 112 to synchronously rotate to a plurality of different rotation angles when the cooling fan 200 is operated at each preset rotation speed. The at least one recording element 113 is configured to collect sound source signals of the cooling fan 200 once when the cooling fan 200 is operated at each preset rotation speed and the cooling fan 200 and the at least one recording element 113 are synchronously rotated to each rotation angle; the at least one recording element 113 is further configured to send each collected sound source signal to the abnormal sound detection module 120. The abnormal sound detection module 120 is configured to detect whether the heat dissipation fan 200 has abnormal sound according to each sound source signal.

In some embodiments, the number of recording elements 113 in the sound source collection device 110 is at least one, i.e., the number of recording elements 113 in the sound source collection device 110 may be 1, 2, or 3, etc. The number of recording elements 113 in the sound source collecting device 110 is not limited in the embodiment of the present application, and may be set according to actual situations.

When the number of recording elements 113 in the sound source collecting device 110 is greater, the more sound source signals are collected during the abnormal sound detection of the cooling fan 200, the possibility that the abnormal sound is collected during the detection of the cooling fan 200 with abnormal sound can be further improved, so that the accuracy of the abnormal sound detection result of the cooling fan 200 is further improved.

Taking the number of recording elements 113 in the sound source collecting device 110 as two as an example, as shown in fig. 2, at least one recording element 113 in the sound source collecting device 110 includes a first recording element 1131 and a second recording element 1132, i.e. the two recording elements 113 in the sound source collecting device 110 may be respectively referred to as a first recording element 1131 and a second recording element 1132. The first recording element 1131 may also be referred to as an upmix, and the second recording element 1132 may also be referred to as a downmix.

The drive mechanism 111 is mechanically coupled to the first recording element 1131 and the second recording element 1132, respectively, and the drive mechanism 111 is also mechanically coupled to the test floor 112 (not shown in fig. 2). When the heat dissipation fan 200 is detected for abnormal sound, the heat dissipation fan 200 can be fixed on the test base 112, and the driving mechanism 111 can drive the test base 112, the first recording element 1131 and the second recording element 1132 to synchronously rotate according to the arrow direction shown in fig. 2, so that the heat dissipation fan 200, the first recording element 1131 and the second recording element 1132 on the test base 112 synchronously rotate to a preset rotation angle.

As shown in fig. 3, the driving mechanism 111 may include a structure of a servo motor 1111 and a rotating arm 1112, and the servo motor 1111 may be a mute direct drive motor. The servo motor 1111 is mechanically coupled to a rotating arm 1112, and the rotating arm 1112 is in turn mechanically coupled to the test base 112, a first recording element 1131, and a second recording element 1132. Wherein the first recording element 1131 and the second recording element 1132 are respectively located at two opposite sides of the test chassis 112.

When the heat radiation fan 200 is detected for abnormal sound, the servo motor 1111 drives the rotating arm 1112 to rotate, and since the rotating arm 1112 is mechanically connected with the test base plate 112, the first recording element 1131 and the second recording element 1132 respectively, the rotating arm 1112 drives the test base plate 112, the first recording element 1131 and the second recording element 1132 to synchronously rotate when rotating, that is, the test base plate 112, the first recording element 1131 and the second recording element 1132 synchronously rotate along with the rotating arm 1112, so that the heat radiation fan 200, the first recording element 1131 and the second recording element 1132 on the test base plate 112 synchronously rotate to a preset rotation angle.

In order to realize detection of abnormal sound conditions of the cooling fan 200 under a plurality of rotation angles, the embodiment of the present application may control the cooling fan 200 to rotate by using the servo motor 1111 and the rotating arm 1112 shown in fig. 3, so as to realize stepless angle control of the cooling fan 200, that is, control the cooling fan 200 to rotate at any angle from 0 ° to 360 °.

In performing abnormal sound detection on the heat radiation fan 200, as shown in fig. 3 and 4, the heat radiation fan 200 is disposed on the test base 112, and the heat radiation fan 200 is fixed on the test base 112 by the fixing bracket 115. In some embodiments, the number of the fixing brackets 115 in the sound source collecting apparatus 110 may be plural. In the process of detecting abnormal sounds of the cooling fan 200, the fixing bracket 115 may be controlled by a motor to fix the cooling fan 200 to the test floor 112, the motor for driving the fixing bracket 115 being not the same motor as the servo motor 1111 for driving the rotation of the rotation arm 1112.

After the cooling fan 200 is fixed on the test base 112, the first recording element 1131 and the second recording element 1132 are disposed perpendicular to the cooling fan 200. In addition, when the servo motor 1111 and the rotating arm 1112 are used to control the cooling fan 200, the first recording element 1131 and the second recording element 1132 to rotate synchronously, the angle and the relative position between the first recording element 1131 and the cooling fan 200 are not changed, and the angle and the relative position between the second recording element 1132 and the cooling fan 200 are not changed.

In addition, the sound source collecting device 110 further includes a support 116, a support bearing 117, and other accessory structures. The support 116 and the support bearing 117 are used for fixation with a base in the sound source-collecting device 110.

In some scenarios, the heat dissipation fan 200 may generate abnormal sound only in some placing postures or rotating speed states, so in order to improve the possibility that the heat dissipation fan with abnormal sound is excited in the detection process, the embodiment of the application may collect sound source signals when the heat dissipation fan 200 operates in different postures and different rotating speed states.

That is, when the fan control module 114 controls the cooling fan 200 to operate at each of a plurality of different preset rotational speeds, and the driving mechanism 111 drives the cooling fan 200, the first recording element 1131 and the second recording element 1132 to rotate synchronously to each of a plurality of different rotational angles, the first recording element 1131 and the second recording element 1132 each collect the sound source signal of the cooling fan 200 once.

In some embodiments, the plurality of different preset rotational speeds includes a first preset rotational speed that is greater than a second preset rotational speed, which may be referred to as a medium speed, and a second preset rotational speed that is referred to as a low speed. For example, the first preset rotational speed is 4000.+ -.50 rpm and the second preset rotational speed is 2500.+ -.50 rpm.

It is understood that the first preset rotational speed is not limited to 4000±50rpm, and the second preset rotational speed is not limited to 2500±50rpm, and specific values of the first preset rotational speed and the second preset rotational speed are not limited in the embodiment of the present application.

The fan control module 114 controls the cooling fan 200 to perform stepless speed regulation by using the voltage signal, so as to respectively adjust the fan speed of the cooling fan 200 to a first preset speed and a second preset speed. Stepless speed regulation refers to any speed regulation, i.e. the cooling fan 200 can realize any continuous speed change under the control of the fan control module 114.

In some embodiments, the plurality of different rotation angles includes a first rotation angle, a second rotation angle, and a third rotation angle, the first rotation angle, the second rotation angle, and the third rotation angle being different. For example, the first rotation angle is 0 °, the second rotation angle is 90 °, and the third rotation angle is 180 °.

It is understood that the first rotation angle is not limited to 0 °, the second rotation angle is not limited to 90 °, and the third rotation angle is not limited to 180 °, and specific values of the first rotation angle, the second rotation angle, and the third rotation angle are not limited in the embodiment of the present application.

The driving mechanism 111 may control the cooling fan 200 to hover at three postures of the first rotation angle, the second rotation angle and the third rotation angle, respectively. Taking the example that the first rotation angle is 0 °, the second rotation angle is 90 °, and the third rotation angle is 180 °, when the cooling fan 200 hovers in the horizontal direction shown in fig. 3, and the first recording element 1131 is located above the test base 112, and the second recording element 1132 is located below the test base 112, at this time, the rotation angle of the cooling fan 200 is 0 ° of the first rotation angle; when the heat radiation fan 200 hovers in the vertical direction, at this time, the rotation angle of the heat radiation fan 200 is the second rotation angle 90 °; when the heat radiation fan 200 hovers in the horizontal direction and the first recording element 1131 is located below the test base 112 and the second recording element 1132 is located above the test base 112, the rotation angle of the heat radiation fan 200 is the third rotation angle 180 °.

The specific process of the embodiment of the present application for collecting the sound source signal of the cooling fan 200 is described below by taking a plurality of different preset rotational speeds including a first preset rotational speed and a second preset rotational speed, and a plurality of different rotational angles including a first rotational angle, a second rotational angle, and a third rotational angle as an example.

When the abnormal sound detection is performed on the cooling fan 200, the fan control module 114 first adjusts the fan speed of the cooling fan 200 to a first preset speed. In the case of adjusting the fan rotation speed of the cooling fan 200 to a first preset rotation speed, the driving mechanism 111 drives the cooling fan 200, the first recording element 1131 and the second recording element 1132 on the test base 112 to synchronously rotate to a first rotation angle, and the first recording element 1131 and the second recording element 1132 at this time respectively collect the sound source signals of the cooling fan 200 once; the driving mechanism 111 then drives the cooling fan 200, the first recording element 1131 and the second recording element 1132 on the test base 112 to synchronously rotate to a second rotation angle, and the first recording element 1131 and the second recording element 1132 at this time respectively acquire the sound source signals of the cooling fan 200 once again; the driving mechanism 111 continues to drive the cooling fan 200, the first recording element 1131 and the second recording element 1132 on the test base 112 to synchronously rotate to a third rotation angle, and the first recording element 1131 and the second recording element 1132 at this time respectively acquire the sound source signals of the cooling fan 200 once again.

Then, the fan control module 114 adjusts the fan speed of the cooling fan 200 to a second preset speed. In the case of adjusting the fan rotation speed of the cooling fan 200 to the second preset rotation speed, the driving mechanism 111 drives the cooling fan 200, the first recording element 1131 and the second recording element 1132 on the test base 112 to synchronously rotate to the first rotation angle, and the first recording element 1131 and the second recording element 1132 at this time respectively collect the sound source signals of the cooling fan 200 once; the driving mechanism 111 then drives the cooling fan 200, the first recording element 1131 and the second recording element 1132 on the test base 112 to synchronously rotate to a second rotation angle, and the first recording element 1131 and the second recording element 1132 at this time respectively acquire the sound source signals of the cooling fan 200 once again; the driving mechanism 111 continues to drive the cooling fan 200, the first recording element 1131 and the second recording element 1132 on the test base 112 to synchronously rotate to a third rotation angle, and the first recording element 1131 and the second recording element 1132 at this time respectively acquire the sound source signals of the cooling fan 200 once again.

In summary, the embodiment of the present application adopts the first recording element 1131 and the second recording element 1132 to respectively collect the sound source signals of the radiator fan 200 at the first rotation angle, the second rotation angle and the third rotation angle when the first preset rotation speed is adopted, and to respectively collect the sound source signals of the radiator fan 200 at the first rotation angle, the second rotation angle and the third rotation angle when the second preset rotation speed is adopted. That is, the first recording element 1131 collects 6 sound source signals in total, and the second recording element 1132 also collects 6 sound source signals in total, that is, collects 12 sound source signals in total for the cooling fan 200. The 12 sound source signals may be transmitted to the abnormal sound detection module 120, and the abnormal sound detection module 120 may detect whether the abnormal sound exists in the cooling fan 200 according to the 12 sound source signals.

It is understood that the plurality of different preset rotational speeds in the embodiment of the present application is not limited to two preset rotational speeds, but may be other numbers of preset rotational speeds, for example, the plurality of different preset rotational speeds are three different preset rotational speeds, that is, the plurality of different preset rotational speeds include a first preset rotational speed, a second preset rotational speed, and a third preset rotational speed, and the first preset rotational speed, the second preset rotational speed, and the third preset rotational speed are all different. The number of preset rotating speeds is not limited, and the preset rotating speeds can be set according to actual conditions.

Accordingly, the plurality of different rotation angles in the embodiment of the present application is not limited to three rotation angles, and may be other numbers of rotation angles, for example, the plurality of different rotation angles are four different rotation angles, that is, the plurality of different rotation angles may include a first rotation angle, a second rotation angle, a third rotation angle, and a fourth rotation angle, and the first rotation angle, the second rotation angle, the third rotation angle, and the fourth rotation angle are all different. The number of rotation angles in the embodiment of the application is not limited, and can be set according to actual conditions.

Therefore, in the embodiment of the application, the sound source signals of the radiator fan 200 are collected by the recording element 113 under a plurality of different preset rotation speeds and a plurality of different rotation angles, and the abnormal sound detection module 120 is utilized to detect whether the radiator fan 200 has abnormal sound or not according to the collected plurality of sound source signals, which can improve the possibility that the radiator fan 200 with abnormal sound is excited to generate abnormal sound in the detection process, thereby improving the accuracy of the abnormal sound detection result of the radiator fan 200.

In addition, when the cooling fan 200 rotates to a plurality of different rotation angles, the angle and the relative position between the cooling fan 200 and the recording element 113 are not changed, which can improve the consistency of the sound source signals collected by the recording element 113 under the different rotation angles of the cooling fan 200, thereby improving the accuracy of the abnormal sound detection result of the cooling fan 200.

In some related art, as shown in fig. 5, the fan control module 114 may include a high-level controller 1141 and a voltage output module 1142. The upper controller 1141 may send a control signal to the voltage output module 1142, and the voltage output module 1142 may provide a voltage signal to the cooling fan 200 according to the control signal, where the voltage signal is used to drive the cooling fan 200 to operate.

However, when the above-mentioned open loop control method is used to control the cooling fan 200 to switch between the first preset rotational speed and the second preset rotational speed, the related art may cause a larger actual rotational speed deviation of different cooling fans 200 under the same voltage due to the characteristic deviation of the voltage-rotational speed curve of a part of the cooling fan 200 and the possible problems of scraping, swaying, vibration, etc. of the structure of the cooling fan 200, and the rotational speed deviation of different cooling fans 200 may cause inconsistent abnormal sounds of the cooling fan 200, thereby affecting the abnormal sound detection result of the cooling fan 200.

In order to accurately control the fan rotation speed of the cooling fan 200, a counter module is added to the fan control module 114, so as to realize closed-loop control of the fan rotation speed of the cooling fan 200. As shown in fig. 6, the fan control module 114 includes an upper controller 1141, a voltage output module 1142 and a counter module 1143, the upper controller 1141 is electrically connected to the voltage output module 1142 and the counter module 1143, and the voltage output module 1142 and the counter module 1143 are also electrically connected to the cooling fan 200.

The upper controller 1141 is configured to send a control signal to the voltage output module 1142; the voltage output module 1142 is configured to provide a voltage signal to the heat dissipation fan 200 according to the control signal, where the voltage signal is used to drive the heat dissipation fan 200 to operate; the counter module 1143 is configured to detect a fan rotation speed during operation of the cooling fan 200, and send the fan rotation speed to the upper controller 1141; the upper controller 1141 is further configured to calculate a rotational speed deviation between the rotational speed of the fan and a preset rotational speed; the upper controller 1141 is further configured to determine a voltage compensation value according to the rotation speed deviation; the upper controller 1141 is further configured to adjust a control signal sent to the voltage output module 1142 according to the voltage compensation value, so as to adjust a voltage signal provided by the voltage output module 1142 to the cooling fan 200, where the adjusted voltage signal is used to adjust a fan rotation speed to a preset rotation speed during the operation of the cooling fan 200.

When the upper controller 1141 sends a control signal to the voltage output module 1142, and the voltage output module 1142 provides a voltage signal to the cooling fan 200 according to the control signal to drive the cooling fan 200 to operate, the counter module 1143 may detect the fan rotation speed during the operation of the cooling fan 200 in real time, and send the detected fan rotation speed to the upper controller 1141.

Specifically, when the cooling fan 200 rotates, the counter module 1143 detects the frequency square wave signal generated by each rotation of the cooling fan 200, the counter module 1143 counts the number of the frequency square wave signals in the preset period, calculates the rotation frequency of the cooling fan 200, and converts the rotation speed of the cooling fan 200 according to the corresponding relationship between the rotation frequency of the cooling fan 200 and the rotation speed of the fan. The rotation frequency of the cooling fan 200 is in a direct proportion to the fan rotation speed.

The upper controller 1141 compares the fan rotation speed with a preset rotation speed, calculates a difference between the fan rotation speed and the preset rotation speed, and obtains a rotation speed deviation. For example, when the upper controller 1141 and the voltage output module 1142 control the cooling fan 200 to adjust from the first preset rotational speed to the second preset rotational speed, the upper controller 1141 compares the fan rotational speed collected by the counter module 1143 with the second preset rotational speed, and calculates a rotational speed deviation between the fan rotational speed and the second preset rotational speed.

Next, the upper controller 1141 determines a voltage compensation value corresponding to the rotational speed deviation according to a voltage-rotational speed curve of the standard cooling fan, which may also be referred to as voltage interpolation, and compensates the voltage signal provided to the cooling fan 200 through the voltage output module 1142, so that the actual fan rotational speed of the cooling fan 200 may reach a preset rotational speed range, thereby controlling the abnormal noise variable of the cooling fan 200.

For example, if the voltage value of the voltage signal corresponding to the preset rotation speed 4000rpm is 5V, the upper controller 1141 provides the voltage signal of 5V to the cooling fan 200 through the voltage output module 1142, at this time, the counter module 1143 collects that the actual fan rotation speed of the cooling fan 200 is 3900rpm, the upper controller 1141 calculates the rotation speed deviation to be 100rpm, the upper controller 1141 determines that the voltage compensation value corresponding to the rotation speed deviation 100rpm is 0.1V, and the upper controller 1141 compensates the voltage signal of the cooling fan 200 through the voltage output module 1142, that is, provides the voltage signal of 5.1V to the cooling fan 200 through the voltage output module 1142, so as to adjust the actual fan rotation speed of the cooling fan 200 to 4000rpm.

Through testing, the rotational speed deviation of the cooling fan 200 can reach ±300rpm by performing an open loop control of the fan rotational speed of the cooling fan 200 as shown in fig. 5, and the rotational speed deviation of the cooling fan 200 can be reduced to 50rpm by performing a closed loop control of the fan rotational speed of the cooling fan 200 as shown in fig. 6. Therefore, in the embodiment of the present application, in the manner of performing closed-loop control on the fan rotation speed of the cooling fan 200 as shown in fig. 6, accuracy control on the fan rotation speed of the cooling fan 200 can be achieved, so that stability of abnormal sound detection of the cooling fan 200 is improved.

It should be noted that, the upper controller 1141 and the abnormal sound detection module 120 in the fan control module 114 may be integrated together or may be separately provided.

In the embodiment of the present application, the abnormal sound detection module 120 may be an upper computer, and the abnormal sound detection module 120 is specifically configured to: calculating the average spectral kurtosis and the average spectral peak value of each sound source signal; calculating the sound pressure level of each sound source signal; whether or not the heat radiation fan 200 has a foreign sound is determined according to the average spectral kurtosis, the average spectral peak value, and the sound pressure level of each sound source signal.

The abnormal sound source of the cooling fan 200 may be the reasons of unbalanced rotor, uneven blade quality, periodic rubbing of the blades and the frame structural member, and loosening caused by uneven winding of the motor winding. In some related arts, only the abnormal sound itself is focused on to determine whether the abnormal sound exists in the cooling fan 200 according to the sound pressure level of some frequency bands in the collected sound source signal. However, this method is easily affected by equipment noise, environmental noise, fan rotation speed, etc., and particularly, low-frequency noise is more disturbed, so that the interception rate and the overdriving rate of the abnormal sound detection of the cooling fan 200 are difficult to meet the requirements due to the poor interception effect of the sound pressure level on the low-frequency abnormal sound, and thus, when only the sound pressure level is used to determine whether the abnormal sound exists in the cooling fan 200, the accuracy of the abnormal sound detection result of the cooling fan 200 is low.

Therefore, the embodiment of the application not only considers the corresponding sound pressure level of the sound source signal of the cooling fan 200, but also focuses the specific frequency band, and introduces the average spectral kurtosis and the average spectral peak value, namely, the average spectral kurtosis, the average spectral peak value and the sound pressure level are adopted to jointly judge whether the cooling fan 200 has abnormal sound, so that the interception rate of abnormal sound detection of the cooling fan 200 is improved, the over-killing rate of abnormal sound detection of the cooling fan 200 is reduced, and the accuracy of the abnormal sound detection result of the cooling fan 200 is further improved.

In some embodiments, the abnormal sound detection module 120 is specifically configured to: carrying out band-pass filtering processing on each sound source signal; performing Fourier transform on each sound source signal subjected to band-pass filtering treatment to obtain a frequency spectrum corresponding to each sound source signal; extracting a frequency band to be analyzed in a frequency spectrum corresponding to each sound source signal; and calculating to obtain the average spectral kurtosis and the average spectral peak value of each sound source signal according to the frequency band to be analyzed corresponding to each sound source signal.

Specifically, the frequency band to be analyzed includes a plurality of frequency multiplication frequency bands corresponding to the frequency conversion of the cooling fan 200. The abnormal sound detection module 120 is specifically configured to: calculating the spectral kurtosis and the spectral peak value corresponding to each frequency multiplication frequency band in the frequency band to be analyzed corresponding to each sound source signal; calculating an average value of the spectral kurtosis corresponding to a plurality of frequency doubling frequency bands in the frequency bands to be analyzed corresponding to each audio signal, and obtaining the average spectral kurtosis of each audio signal; and calculating the average value of the frequency spectrum peak values corresponding to the multiple frequency multiplication frequency bands in the frequency bands to be analyzed corresponding to each sound source signal, and obtaining the average frequency spectrum peak value of each sound source signal.

Each of the sound source signals collected by the recording element 113 is a time domain waveform, and after the band-pass filtering process is performed on each of the sound source signals, each of the sound source signals after the band-pass filtering process is also a time domain waveform. Then, fourier transform (Fourier transform) may be used to transform each of the sound source signals after the band-pass filtering process to a frequency domain, so as to obtain a frequency spectrum corresponding to each of the sound source signals.

Since the heat radiation fan 200 is a rotary mechanical structure, most of the faults thereof are characterized by a rotating frequency. The characteristic frequency of the failure may also be expressed as a period in which the failure occurs, and the rotation frequency refers to a rotation frequency, that is, a rotation frequency when the cooling fan 200 rotates.

If the failure of the heat radiation fan 200 is a single point contact, the failure waveform is a sine wave with a frequency of a revolution; if the fault is a line or surface contact, the fault waveform is a superposition of waveforms of the same frequency (frequency conversion), different amplitudes and different phases, so that the distortion of the waveform is generated, and the greater the fault degree is, the greater the distortion degree of the waveform is. If the cooling fan 200 has no fault, the frequency spectrum of the corresponding sound source signal after fourier transformation does not have frequency multiplication components of the converted frequency, if the cooling fan 200 has fault, the waveform of the corresponding sound source signal after fourier transformation corresponding to the converted frequency will be distorted, and the frequency multiplication components of the corresponding sound source signal need to be synthesized, so that the frequency spectrum salient frequency can generate a plurality of frequency multiplication components of the converted frequency besides the converted frequency.

Therefore, in the low frequency band, some frequency doubling frequency bands of the frequency conversion are used as the frequency band to be analyzed, that is, the frequency band to be analyzed includes a plurality of frequency doubling frequency bands corresponding to the frequency conversion of the cooling fan 200. Calculating the spectral kurtosis and the spectral peak value corresponding to each frequency multiplication frequency band in the frequency band to be analyzed corresponding to each sound source signal; then, an average value is calculated for the spectral kurtosis corresponding to a plurality of frequency doubling frequency bands in the frequency band to be analyzed of each sound source signal to obtain an average spectral kurtosis of each sound source signal, and an average value is calculated for the spectral peak values corresponding to a plurality of frequency doubling frequency bands in the frequency band to be analyzed of each sound source signal to obtain an average spectral peak value of each sound source signal. The detection index is used as a part of the detection index for judging whether or not the heat radiation fan 200 has abnormal noise based on the average spectral kurtosis and the average spectral peak.

The spectral kurtosis corresponding to the frequency-doubled frequency band refers to the steepness of the frequency-doubled frequency band, which is defined as: the fourth-order central moment of the random variable divided by the fourth power of the standard deviation is a dimensionless factor used to verify the degree of deviation of the signal from normal distribution.

It should be noted that, the frequency spectrum corresponding to each audio signal includes a plurality of frequency bands, for example, frequency bands from 1 to 30 frequency multiples of the converted frequency, and the embodiment of the application can extract a part of the frequency multiplication frequency bands from the frequency spectrum corresponding to the audio signal as the frequency bands to be analyzed. The embodiment of the application does not limit the specific range of the frequency multiplication frequency band included in the frequency band to be analyzed.

Taking the to-be-analyzed frequency band of each audio signal as an example, after the frequency spectrum kurtosis and the frequency spectrum peak value corresponding to each frequency doubling frequency band in the N frequency doubling frequency bands are obtained by calculation, calculating an average value of the frequency spectrum kurtosis corresponding to the N frequency doubling frequency bands to obtain an average frequency spectrum kurtosis, and calculating an average value of the frequency spectrum peak values corresponding to the N frequency doubling frequency bands to obtain an average frequency spectrum peak value.

In some embodiments, the abnormal sound detection module 120 is specifically configured to: performing high-pass filtering processing on each sound source signal; each sound source signal after the high-pass filtering processing is subjected to filtering processing by adopting a human ear auditory model; and calculating the sound pressure level of each sound source signal after filtering processing by adopting the human ear auditory model.

Since the correlation of the abnormal sound of some cooling fans 200 with the frequency conversion is small, there is a large difference from the sound pressure level of the high frequency band. Therefore, in the high frequency band, after the high-pass filtering process and the human ear auditory model filtering process are adopted, the sound pressure level of some high frequency bands is calculated as another part of the detection index for judging whether or not the heat radiation fan 200 has abnormal sound.

After each sound source signal is subjected to high-pass filtering treatment, a human ear auditory model can be adopted to carry out filtering treatment on each sound source signal subjected to the high-pass filtering treatment, so that objective indexes of the sound pressure level obtained through final calculation are unified with subjective feelings of human ears.

For example, the frequency range of the high-pass filtering is 10KHz to 24KHz, so that the frequency range of each sound source signal after the high-pass filtering and the human ear auditory model filtering is 10KHz to 24KHz, and the frequency range of the high-pass filtering is not limited in the embodiment of the application.

Specifically, the abnormal sound detection module 120 is specifically configured to: calculating a sampling value corresponding to each sound source signal after filtering processing by adopting the human ear auditory model, and multiplying the sampling value by the reference voltage of analog-to-digital conversion to obtain a voltage value corresponding to each sound source signal; calculating the ratio of the voltage value corresponding to each sound source signal and the sensitivity of the recording element 113 to obtain the sound pressure of each sound source signal; the sound pressure level of each sound source signal is calculated by the following formula: spl=20×lg (P _e /P _ref ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein SPL represents the sound pressure level of each sound source signal, P _e Each representation isSound pressure of individual sound source signal, P _ref Representing a reference sound pressure.

In research fields such as hearing test and noise detection, sound pressure levels (sound pressure level, SPL) are frequently used as indicators, and the sound pressure levels are derived from a pair of numbers to represent the magnitude of sound according to the response characteristics of human ears to sound intensity changes for convenience of application. The sound pressure level is expressed in decibels (dB), and when the sound pressure level is higher, the sound volume of the sound source signal is larger, and when the sound pressure level is lower, the sound volume of the sound source signal is smaller.

After high-pass filtering processing and auditory model filtering processing are carried out on each sound source signal, sampling is carried out on each sound source signal, and the product of a sampling value obtained by sampling and the reference voltage of analog-to-digital conversion is calculated to obtain a voltage value corresponding to each sound source signal, namely, the voltage value=the sampling value multiplied by the reference voltage of analog-to-digital conversion. The voltage value is in volts (V), the sampling value is in pascals (Pa), and the reference voltage for analog-to-digital conversion is in V/Pa.

Next, the voltage value corresponding to each sound source signal is divided by the sensitivity of the recording element 113 to obtain the sound pressure of each sound source signal, that is, sound pressure=voltage value/sensitivity. The unit of sensitivity is V/Pa and the unit of sound pressure is Pa.

Finally, spl=20×lg (P _e /P _ref ) The sound pressure level of each sound source signal is calculated, that is, the sound pressure level is obtained by multiplying the ratio of the sound pressure of each sound source signal to the reference sound pressure by 20 after taking the common logarithm.

It should be noted that the reference voltage and the reference sound pressure of the analog-to-digital conversion may be preset fixed values. For example, the reference voltage for analog-to-digital conversion may be 4.88V/Pa, and the reference sound pressure in air may be 2×10 ^-5 Pa. The sensitivity is a value associated with the recording element 113.

Taking at least one recording element 113 including a first recording element 1131 and a second recording element 1132, and a plurality of different preset rotational speeds including a first preset rotational speed and a second preset rotational speed, and a plurality of different rotational angles including a first rotational angle, a second rotational angle and a third rotational angle as an example, a total of 12 sound source signals can be collected, and by adopting the above manner for each sound source signal, an average spectral kurtosis, an average spectral peak value and a sound pressure level of the 12 sound source signals can be calculated.

The abnormal sound detection module 120 is specifically configured to: when the average spectral kurtosis of each sound source signal is smaller than the spectral kurtosis threshold, the average spectral peak of each sound source signal is smaller than the spectral peak threshold, and the sound pressure level of each sound source signal is smaller than the sound pressure level threshold, determining that no abnormal sound exists in the cooling fan 200; when the average spectral kurtosis of the at least one sound source signal is greater than or equal to the spectral kurtosis threshold, and/or the average spectral peak of the at least one sound source signal is greater than or equal to the spectral peak threshold, and/or the sound pressure level of the at least one sound source signal is greater than or equal to the sound pressure level threshold, it is determined that the heat radiation fan 200 is in the presence of a foreign sound.

The alien detection module 120 compares the average spectral kurtosis of each of the sound source signals to a spectral kurtosis threshold, compares the average spectral peak of each of the sound source signals to a spectral peak threshold, and compares the sound pressure level of each of the sound source signals to a sound pressure level threshold.

Taking a total of 12 sound source signals as an example, when the average spectral kurtosis of each of the 12 sound source signals is less than the spectral kurtosis threshold, the average spectral peak of each of the 12 sound source signals is less than the spectral peak threshold, and the sound pressure level of each of the 12 sound source signals is less than the sound pressure level threshold, the alien sound detection module 120 determines that the heat dissipation fan 200 is not present.

And when the average spectral kurtosis of at least one of the 12 sound source signals is greater than or equal to the spectral kurtosis threshold, and/or the average spectral peak of at least one of the 12 sound source signals is greater than or equal to the spectral peak threshold, and/or the sound pressure level of at least one of the 12 sound source signals is greater than or equal to the sound pressure level threshold, the abnormal sound detection module 120 determines that the radiator fan 200 is abnormal sound.

It should be noted that, for the same recording element 113 with the same preset rotation speed, the corresponding spectral kurtosis thresholds at different rotation angles are the same, the corresponding spectral peak thresholds at different rotation angles are the same, and the corresponding sound pressure level thresholds at different rotation angles are the same.

Thus, taking a total of 12 audio signals collected as an example, there are 4 spectral kurtosis thresholds, which are respectively a spectral kurtosis threshold corresponding to the first recording element 1131 at a first preset rotational speed, a spectral kurtosis threshold corresponding to the first recording element 1131 at a second preset rotational speed, a spectral kurtosis threshold corresponding to the second recording element 1132 at the first preset rotational speed, and a spectral kurtosis threshold corresponding to the second recording element 1132 at the second preset rotational speed, where the 4 spectral kurtosis thresholds may not be equal; correspondingly, the total of 4 spectrum peak thresholds are respectively a spectrum peak threshold corresponding to the first recording element 1131 at a first preset rotating speed, a spectrum peak threshold corresponding to the first recording element 1131 at a second preset rotating speed, a spectrum peak threshold corresponding to the second recording element 1132 at the first preset rotating speed, and a spectrum peak threshold corresponding to the second recording element 1132 at the second preset rotating speed, and the 4 spectrum peak thresholds may not be equal; correspondingly, the sound pressure level thresholds are 4, which are respectively a sound pressure level threshold corresponding to the first recording element 1131 at the first preset rotation speed, a sound pressure level threshold corresponding to the first recording element 1131 at the second preset rotation speed, a sound pressure level threshold corresponding to the second recording element 1132 at the first preset rotation speed, and a sound pressure level threshold corresponding to the second recording element 1132 at the second preset rotation speed, and the 4 sound pressure level thresholds may not be equal.

The fan abnormal sound detection system provided by the embodiment of the present application is described in detail above, and the method for detecting abnormal sound of the fan provided by the embodiment of the present application is described in detail below based on the fan abnormal sound detection system shown in fig. 1. Fig. 7 is a flowchart of a method for detecting abnormal noise of a fan according to an embodiment of the present application. Referring to fig. 7, the method for detecting abnormal noise of a fan may specifically include the following steps:

in step 701, the fan control module controls the cooling fan to sequentially operate at a plurality of different preset rotational speeds.

When the abnormal sound detection is performed on the cooling fan 200, the cooling fan 200 is first placed in the limit groove of the test base 112, and the cooling fan 200 is fixed on the test base 112 by using the fixing bracket 115. Then, a test process is started, specifically, the fan control module 114 controls the cooling fan 200 to sequentially operate at a plurality of different preset rotational speeds.

The plurality of different preset rotating speeds comprise a first preset rotating speed and a second preset rotating speed, wherein the first preset rotating speed is 4000+/-50 rpm, and the second preset rotating speed is 2500+/-50 rpm. That is, the fan control module 114 may control the cooling fan 200 to rotate at a first preset rotation speed, and then control the cooling fan 200 to operate at a second preset rotation speed.

In some embodiments, the fan control module 114 includes a host controller 1141, a voltage output module 1142, and a counter module 1143, where the host controller 1141 is electrically connected to the voltage output module 1142 and the counter module 1143, and the voltage output module 1142 and the counter module 1143 are further electrically connected to the cooling fan 200.

Specifically, the fan control module 114 may control the radiator fan 200 to sequentially operate at a plurality of different preset rotational speeds in the following manner: the upper controller 1141 sends a control signal to the voltage output module 1142; the voltage output module 1142 provides a voltage signal to the heat dissipation fan 200 according to the control signal, where the voltage signal is used to drive the heat dissipation fan 200 to operate; the counter module 1143 detects a fan rotation speed during the operation of the cooling fan 200, and sends the fan rotation speed to the upper controller 1141; the upper controller 1141 calculates a rotational speed deviation between the rotational speed of the fan and a preset rotational speed; the upper controller 1141 determines a voltage compensation value according to the rotation speed deviation; the upper controller 1141 adjusts a control signal sent to the voltage output module 1142 according to the voltage compensation value, so as to adjust a voltage signal provided by the voltage output module 1142 to the cooling fan 200, where the adjusted voltage signal is used to adjust the fan rotation speed to a preset rotation speed during the operation of the cooling fan 200.

Taking the example that the plurality of different preset rotational speeds include a first preset rotational speed and a second preset rotational speed, the upper controller 1141, the voltage output module 1142 and the counter module 1143 may adopt the above manner to control the cooling fan 200 to perform rotational speed at the first preset rotational speed, and then control the cooling fan 200 to perform operation at the second preset rotational speed.

Step 702, under the condition that the cooling fan runs at each preset rotation speed, the driving mechanism drives the cooling fan and at least one recording element on the test base plate to synchronously rotate to a plurality of different rotation angles.

In step 703, when the cooling fan is operated at each preset rotation speed, and the cooling fan and the at least one recording element synchronously rotate to each rotation angle, the at least one recording element collects the sound source signal of the cooling fan once.

Taking a plurality of different preset rotational speeds including a first preset rotational speed and a second preset rotational speed as an example. Under the condition that the fan control module 114 controls the cooling fan 200 to operate at the first preset rotation speed, the driving mechanism 111 drives the cooling fan 200 and the at least one recording element 113 on the test base 112 to rotate synchronously to a plurality of different rotation angles, and under the condition that the cooling fan 200 operates at the first preset rotation speed and the cooling fan 200 and the at least one recording element 113 rotate synchronously to each rotation angle of the plurality of different rotation angles, the at least one recording element 113 collects the sound source signal of the cooling fan 200 under each rotation angle.

Next, under the condition that the fan control module 114 controls the cooling fan 200 to operate at the second preset rotation speed, the driving mechanism 111 drives the cooling fan 200 and the at least one recording element 113 on the test base 112 to rotate synchronously to a plurality of different rotation angles, and under the condition that the cooling fan 200 operates at the second preset rotation speed and the cooling fan 200 and the at least one recording element 113 rotate synchronously to each rotation angle of the plurality of different rotation angles, the at least one recording element 113 collects the sound source signal of the cooling fan 200 under each rotation angle.

In some embodiments, the at least one recording element 113 includes a first recording element 1131 and a second recording element 1132, the first recording element 1131 and the second recording element 1132 being located on opposite sides of the test chassis 112, respectively. The plurality of different rotation angles includes a first rotation angle of 0 °, a second rotation angle of 90 °, and a third rotation angle of 180 °.

Step 704, at least one recording element sends each acquired sound source signal to the abnormal sound detection module.

Step 705, the abnormal sound detection module detects whether the abnormal sound exists in the cooling fan according to each sound source signal.

The specific process of the embodiment of the present application for collecting the sound source signal of the radiator fan 200 is described below by taking the example that the at least one recording element 113 includes a first recording element 1131 and a second recording element 1132, the plurality of different preset rotational speeds includes a first preset rotational speed and a second preset rotational speed, the plurality of different rotational angles includes a first rotational angle, a second rotational angle and a third rotational angle, the first rotational angle is 0 °, the second rotational angle is 90 °, and the third rotational angle is 180 °.

Fig. 8 is a flowchart of an embodiment of the present application for collecting sound source signals of a cooling fan by using a recording element. Referring to fig. 8, the method specifically includes the following steps:

step 801, placing a cooling fan in a limit groove of a test base plate.

Step 802, fixing the cooling fan on the test base plate by using the fixing bracket.

In the embodiment of the present application, the cooling fan 200 may be manually placed in the limit groove of the test base 112, and then the cooling fan 200 is fixed on the test base 112 by driving the fixing bracket 115 with a motor. Next, the following test flow starts to be executed.

In step 803, the fan control module controls the cooling fan to operate at a first preset rotational speed.

Step 804, under the condition that the cooling fan runs at the first preset rotation speed, the driving mechanism drives the cooling fan, the first recording element and the second recording element on the test base plate to synchronously rotate to 0 °, 90 ° and 180 °, and the first recording element and the second recording element are adopted to respectively collect the sound source signals under each rotation angle.

Under the condition that the fan control module 114 controls the cooling fan 200 to operate at a first preset rotation speed, the driving mechanism 111 drives the cooling fan 200, the first recording element 1131 and the second recording element 1132 on the test base 112 to synchronously rotate to 0 °, and at this time, the first recording element 1131 and the second recording element 1132 respectively collect sound source signals of the cooling fan 200 once; the driving mechanism 111 then drives the cooling fan 200, the first recording element 1131 and the second recording element 1132 on the test base 112 to synchronously rotate to 90 °, and the first recording element 1131 and the second recording element 1132 at this time respectively acquire the sound source signals of the cooling fan 200 once again; the driving mechanism 111 continues to drive the cooling fan 200, the first recording element 1131 and the second recording element 1132 on the test base 112 to synchronously rotate to 180 °, and the first recording element 1131 and the second recording element 1132 at this time respectively acquire the sound source signals of the cooling fan 200 once again.

In step 805, the fan control module controls the cooling fan to operate at a second preset rotation speed.

Step 806, under the condition that the cooling fan runs at the second preset rotation speed, the driving mechanism drives the cooling fan, the first recording element and the second recording element on the test base plate to synchronously rotate to 0 °, 90 ° and 180 °, and the first recording element and the second recording element are adopted to respectively collect the sound source signals under each rotation angle.

After the first recording element 1131 and the second recording element 1132 respectively collect the sound source signals under the conditions that the rotation angles are 0 °, 90 ° and 180 ° respectively, the fan control module 114 adjusts the fan rotation speed of the cooling fan 200 to the second preset rotation speed.

Under the condition that the fan control module 114 controls the cooling fan 200 to operate at the second preset rotation speed, the above process is repeatedly executed, that is, the driving mechanism 111 drives the cooling fan 200, the first recording element 1131 and the second recording element 1132 on the test base 112 to synchronously rotate to 0 ° at first, and the first recording element 1131 and the second recording element 1132 at this time respectively collect the sound source signals of the cooling fan 200 once; the driving mechanism 111 then drives the cooling fan 200, the first recording element 1131 and the second recording element 1132 on the test base 112 to synchronously rotate to 90 °, and the first recording element 1131 and the second recording element 1132 at this time respectively acquire the sound source signals of the cooling fan 200 once again; the driving mechanism 111 continues to drive the cooling fan 200, the first recording element 1131 and the second recording element 1132 on the test base 112 to synchronously rotate to 180 °, and the first recording element 1131 and the second recording element 1132 at this time respectively acquire the sound source signals of the cooling fan 200 once again.

In step 807, the first recording element and the second recording element send the collected sound source signals to the abnormal sound detection module to detect whether the abnormal sound exists in the cooling fan.

Step 808, the fixing support loosens the cooling fan and removes the cooling fan on the test base.

After the first recording element 1131 and the second recording element 1132 send the collected plurality of sound source signals to the abnormal sound detection module 120, the abnormal sound detection module 120 detects whether the abnormal sound exists in the cooling fan 200 according to the plurality of sound source signals, thereby completing an abnormal sound detection process of the cooling fan 200. Then, the fixing bracket is driven by the motor to loosen the heat radiation fan 200, and the heat radiation fan 200 on the test floor 112 is manually taken away.

Fig. 9 is a flowchart illustrating a detection of whether a noise exists in a cooling fan according to a sound source signal by a noise detection module according to an embodiment of the present application. Referring to fig. 9, the method specifically includes the following steps:

step 901, the abnormal sound detection module acquires each sound source signal acquired by the recording element.

In the embodiment of the present application, taking at least one recording element 113 including a first recording element 1131 and a second recording element 1132 as an example, the first recording element 1131 sends the collected sound source signal of the cooling fan 200 to the abnormal sound detection module 120, and the second recording element 1132 also sends the collected sound source signal of the cooling fan 200 to the abnormal sound detection module 120.

In step 902, the alien sound detection module performs bandpass filtering processing on each sound source signal.

In step 903, the abnormal sound detection module performs fourier transform on each sound source signal after the band-pass filtering process, so as to obtain a frequency spectrum corresponding to each sound source signal.

In step 904, the alien detection module extracts a frequency band to be analyzed in the frequency spectrum corresponding to each sound source signal.

In step 905, the abnormal sound detection module calculates an average spectral kurtosis and an average spectral peak value of each sound signal according to the frequency band to be analyzed corresponding to each sound signal.

In some embodiments, the frequency band to be analyzed includes a plurality of frequency multiplication frequency bands corresponding to the frequency conversion of the cooling fan 200. Specifically, the abnormal sound detection module 120 calculates an average spectral kurtosis and an average spectral peak value of each sound source signal as follows: the abnormal sound detection module 120 calculates the spectral kurtosis and the spectral peak value corresponding to each frequency multiplication frequency band included in the frequency band to be analyzed corresponding to each sound source signal; the abnormal sound detection module 120 calculates an average value of the spectral kurtosis corresponding to a plurality of frequency multiplication frequency bands included in the frequency band to be analyzed corresponding to each sound source signal, and obtains the average spectral kurtosis of each sound source signal; the abnormal sound detection module 120 calculates an average value of spectrum peaks corresponding to a plurality of frequency multiplication frequency bands included in the frequency band to be analyzed corresponding to each sound source signal, so as to obtain an average spectrum peak value of each sound source signal.

Thus, according to the implementation of steps 902 to 905 described above, the alien detection module 120 may calculate an average spectral kurtosis and an average spectral peak for each of the sound source signals.

In step 906, the alien sound detection module performs high-pass filtering processing on each sound source signal.

In step 907, the abnormal sound detection module uses the human ear auditory model to perform filtering processing on each sound source signal after the high-pass filtering processing.

In step 908, the abnormal sound detection module calculates a sound pressure level of each sound source signal after filtering with the human ear auditory model.

In some embodiments, the abnormal sound detection module 120 specifically calculates as followsTo the sound pressure level of each sound source signal after filtering processing using the human ear auditory model: the abnormal sound detection module 120 calculates a sampling value corresponding to each sound source signal after filtering processing by adopting the human ear auditory model, and products the sampling value and the reference voltage of analog-digital conversion to obtain a voltage value corresponding to each sound source signal; the abnormal sound detection module 120 calculates a voltage value corresponding to each sound source signal, and a ratio of the voltage value to the sensitivity of the recording element 113, so as to obtain the sound pressure of each sound source signal; the abnormal sound detection module 120 calculates the sound pressure level of each sound source signal according to the following formula: spl=20×lg (P _e /P _ref ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein SPL represents the sound pressure level of each sound source signal, P _e Representing the sound pressure of each sound source signal, P _ref Representing a reference sound pressure.

Thus, the abnormal sound detection module 120 may calculate the sound pressure level of each of the sound source signals in the manner of step 906 and step 908 described above.

In step 909, the abnormal sound detection module determines whether the heat dissipation fan has abnormal sound according to the average spectral kurtosis, the average spectral peak value and the sound pressure level of each sound source signal.

In some embodiments, the abnormal sound detection module 120 may determine whether the abnormal sound exists in the cooling fan 200 as follows: when the average spectral kurtosis of each sound source signal is smaller than the spectral kurtosis threshold, the average spectral peak of each sound source signal is smaller than the spectral peak threshold, and the sound pressure level of each sound source signal is smaller than the sound pressure level threshold, the abnormal sound detection module 120 determines that the cooling fan 200 does not have abnormal sound; the abnormal sound detection module 120 determines that the cooling fan 200 is present when the average spectral kurtosis of the at least one sound source signal is greater than or equal to the spectral kurtosis threshold, and/or the average spectral peak of the at least one sound source signal is greater than or equal to the spectral peak threshold, and/or the sound pressure level of the at least one sound source signal is greater than or equal to the sound pressure level threshold.

In summary, in the embodiment of the present application, when the cooling fan 200 is at a plurality of different preset rotational speeds and a plurality of different rotational angles, the recording element 113 is used to collect the sound source signals of the cooling fan 200, and the cooling fan 200 operates at a plurality of different preset rotational speeds, which can improve the possibility that the cooling fan 200 with abnormal sound is excited to generate abnormal sound in the detection process, thereby improving the accuracy of the abnormal sound detection result of the cooling fan 200. In addition, when the cooling fan 200 rotates to a plurality of different rotation angles, the recording element 113 and the cooling fan 200 synchronously rotate, so that when the cooling fan 200 rotates to different rotation angles, the angle and the relative position between the cooling fan 200 and the recording element 113 are not changed, the consistency of sound source signals collected by the recording element 113 under different rotation angles of the cooling fan 200 can be improved, and the accuracy of abnormal sound detection results of the cooling fan 200 is improved.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods and apparatus (systems) according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processing unit of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processing unit of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The foregoing detailed description of the application has been presented for purposes of illustration and description, and it should be understood that the foregoing is by way of illustration and description only, and is not intended to limit the scope of the application.

Claims

1. The abnormal sound detection method of the fan is characterized by being applied to an abnormal sound detection system of the fan, wherein the abnormal sound detection system of the fan comprises a sound source acquisition device and an abnormal sound detection module, the sound source acquisition device comprises a driving mechanism, a test base plate, at least one recording element and a fan control module, the driving mechanism is respectively connected with the test base plate and the at least one recording element, a cooling fan is fixed on the test base plate, the fan control module is electrically connected with the cooling fan, and the at least one recording element is electrically connected with the abnormal sound detection module; the method comprises the following steps:

the fan control module controls the cooling fan to sequentially run at a plurality of different preset rotating speeds;

Under the condition that the cooling fan runs at each preset rotating speed, the driving mechanism drives the cooling fan and the at least one recording element on the test bottom plate to synchronously rotate to a plurality of different rotating angles;

under the condition that the cooling fan runs at each preset rotating speed and the cooling fan and the at least one recording element synchronously rotate to each rotating angle, the at least one recording element collects sound source signals of the cooling fan once;

the at least one recording element sends each acquired sound source signal to the abnormal sound detection module;

and the abnormal sound detection module detects whether abnormal sound exists in the cooling fan according to each sound source signal.

2. The method of claim 1, wherein the abnormal sound detection module detects whether the abnormal sound exists in the cooling fan according to each sound source signal, comprising:

the abnormal sound detection module calculates average spectrum kurtosis and average spectrum peak value of each sound source signal;

the abnormal sound detection module calculates the sound pressure level of each sound source signal;

the abnormal sound detection module determines whether abnormal sound exists in the cooling fan according to the average spectral kurtosis, the average spectral peak value and the sound pressure level of each sound source signal.

3. The method of claim 2, wherein the alien detection module calculates an average spectral kurtosis and an average spectral peak for each of the sound source signals, comprising:

the abnormal sound detection module carries out band-pass filtering processing on each sound source signal;

the abnormal sound detection module performs Fourier transform on each sound source signal subjected to band-pass filtering processing to obtain a frequency spectrum corresponding to each sound source signal;

the abnormal sound detection module extracts a frequency band to be analyzed in a frequency spectrum corresponding to each sound source signal;

and the abnormal sound detection module calculates and obtains the average spectral kurtosis and the average spectral peak value of each sound source signal according to the frequency band to be analyzed corresponding to each sound source signal.

4. The method of claim 3, wherein the frequency band to be analyzed comprises a plurality of frequency multiplication frequency bands corresponding to the frequency conversion of the cooling fan; the abnormal sound detection module calculates an average spectral kurtosis and an average spectral peak value of each sound source signal according to the frequency band to be analyzed corresponding to each sound source signal, and the abnormal sound detection module comprises the following steps:

the abnormal sound detection module calculates the spectral kurtosis and the spectral peak value corresponding to each frequency multiplication frequency band in the frequency band to be analyzed corresponding to each sound source signal;

The abnormal sound detection module calculates an average value of the spectral kurtosis corresponding to the multiple frequency multiplication frequency bands in the frequency bands to be analyzed corresponding to each sound source signal, and obtains the average spectral kurtosis of each sound source signal;

and the abnormal sound detection module calculates the average value of the frequency spectrum peak values corresponding to the multiple frequency multiplication frequency bands in the frequency bands to be analyzed corresponding to each sound source signal, and obtains the average frequency spectrum peak value of each sound source signal.

5. The method of claim 2, wherein the abnormal sound detection module calculates a sound pressure level of each of the sound source signals, comprising:

the abnormal sound detection module carries out high-pass filtering processing on each sound source signal;

the abnormal sound detection module adopts a human ear auditory model to carry out filtering treatment on each sound source signal after the high-pass filtering treatment;

and the abnormal sound detection module calculates the sound pressure level of each sound source signal after the filtering processing of the human ear auditory model.

6. The method of claim 5, wherein the abnormal sound detection module calculates a sound pressure level of each of the sound source signals filtered using the human ear auditory model, comprising:

The abnormal sound detection module calculates a sampling value corresponding to each sound source signal after filtering processing by the human ear auditory model, and products of the sampling values and reference voltages of analog-to-digital conversion to obtain a voltage value corresponding to each sound source signal;

the abnormal sound detection module calculates a voltage value corresponding to each sound source signal and a ratio of the voltage value to the sensitivity of the recording element to obtain the sound pressure of each sound source signal;

the abnormal sound detection module calculates the sound pressure level of each sound source signal according to the following formula:

SPL＝20×lg(P _e /P _ref )；

wherein SPL represents the sound pressure level of each of the sound source signals, P _e Representing the sound pressure, P, of each of the source signals _ref Representing a reference sound pressure.

7. The method of claim 2, wherein the abnormal sound detection module determines whether the heat dissipation fan has abnormal sound based on the average spectral kurtosis, the average spectral peak, and the sound pressure level of each of the sound source signals, comprising:

when the average spectral kurtosis of each sound source signal is smaller than a spectral kurtosis threshold, the average spectral peak of each sound source signal is smaller than a spectral peak threshold, and the sound pressure level of each sound source signal is smaller than a sound pressure level threshold, the abnormal sound detection module determines that the cooling fan has no abnormal sound;

The abnormal sound detection module determines that the cooling fan has abnormal sound when the average spectral kurtosis of at least one of the sound source signals is greater than or equal to the spectral kurtosis threshold, and/or the average spectral peak of at least one of the sound source signals is greater than or equal to the spectral peak threshold, and/or the sound pressure level of at least one of the sound source signals is greater than or equal to the sound pressure level threshold.

8. The method of claim 1, wherein the fan control module comprises a superordinate controller, a voltage output module and a counter module, the superordinate controller being electrically connected to the voltage output module and the counter module, respectively, the voltage output module and the counter module being further electrically connected to the cooling fan; the fan control module controls the cooling fan to sequentially run at a plurality of different preset rotating speeds, and the fan control module comprises:

the upper controller sends a control signal to the voltage output module;

the voltage output module provides a voltage signal for the cooling fan according to the control signal; the voltage signal is used for driving the cooling fan to operate;

the counter module detects the fan rotating speed in the running process of the cooling fan and sends the fan rotating speed to the upper controller;

The upper controller calculates the rotation speed deviation between the rotation speed of the fan and the preset rotation speed;

the upper controller determines a voltage compensation value according to the rotating speed deviation;

the upper controller adjusts the control signal sent to the voltage output module according to the voltage compensation value, and then adjusts the voltage signal provided to the cooling fan by the voltage output module; the adjusted voltage signal is used for adjusting the fan rotating speed in the running process of the cooling fan to the preset rotating speed.

9. The method of any of claims 1 to 8, wherein the at least one sound recording element comprises a first sound recording element and a second sound recording element, the first sound recording element and the second sound recording element being located on opposite sides of the test chassis, respectively;

the plurality of different preset rotational speeds comprise a first preset rotational speed and a second preset rotational speed, wherein the first preset rotational speed is 4000+/-50 rpm, and the second preset rotational speed is 2500+/-50 rpm;

the plurality of different rotation angles includes a first rotation angle of 0 °, a second rotation angle of 90 °, and a third rotation angle of 180 °.

10. The abnormal sound detection system of the fan is characterized by comprising a sound source acquisition device and an abnormal sound detection module, wherein the sound source acquisition device comprises a driving mechanism, a test bottom plate, at least one recording element and a fan control module, the driving mechanism is respectively connected with the test bottom plate and the at least one recording element, a cooling fan is fixed on the test bottom plate, the fan control module is electrically connected with the cooling fan, and the at least one recording element is electrically connected with the abnormal sound detection module;

the fan control module is used for controlling the cooling fan to sequentially run at a plurality of different preset rotating speeds;

the driving mechanism is used for driving the cooling fan and the at least one recording element on the test bottom plate to synchronously rotate to a plurality of different rotation angles under the condition that the cooling fan runs at each preset rotation speed;

the at least one recording element is used for collecting sound source signals of the cooling fan once under the condition that the cooling fan runs at each preset rotating speed and the cooling fan and the at least one recording element synchronously rotate to each rotating angle;

The at least one recording element is further configured to send each collected sound source signal to the abnormal sound detection module;

and the abnormal sound detection module is used for detecting whether the abnormal sound exists in the cooling fan according to each sound source signal.

11. The system according to claim 10, wherein the abnormal sound detection module is specifically configured to:

calculating the average spectral kurtosis and the average spectral peak value of each sound source signal;

calculating the sound pressure level of each sound source signal;

determining whether or not the heat radiation fan has abnormal sound according to the average spectral kurtosis, the average spectral peak value and the sound pressure level of each sound source signal.

12. The system of claim 11, wherein the abnormal sound detection module is specifically configured to:

carrying out band-pass filtering processing on each sound source signal;

performing Fourier transform on each sound source signal subjected to band-pass filtering processing to obtain a frequency spectrum corresponding to each sound source signal;

extracting a frequency band to be analyzed in a frequency spectrum corresponding to each sound source signal;

and calculating to obtain the average spectral kurtosis and the average spectral peak value of each sound source signal according to the frequency band to be analyzed corresponding to each sound source signal.

13. The system of claim 12, wherein the frequency band to be analyzed comprises a plurality of frequency multiplication frequency bands corresponding to a frequency conversion of the cooling fan; the abnormal sound detection module is specifically configured to:

calculating the spectral kurtosis and the spectral peak value corresponding to each frequency multiplication frequency band in the frequency band to be analyzed corresponding to each sound source signal;

calculating the average value of the spectral kurtosis corresponding to the multiple frequency multiplication frequency bands in the frequency bands to be analyzed corresponding to each sound source signal to obtain the average spectral kurtosis of each sound source signal;

and calculating the average value of the frequency spectrum peak values corresponding to the multiple frequency multiplication frequency bands in the frequency bands to be analyzed corresponding to each sound source signal, and obtaining the average frequency spectrum peak value of each sound source signal.

14. The system of claim 11, wherein the abnormal sound detection module is specifically configured to:

carrying out high-pass filtering processing on each sound source signal;

filtering each sound source signal subjected to high-pass filtering by adopting a human ear auditory model;

and calculating the sound pressure level of each sound source signal after the filtering processing of the human ear auditory model.

15. The system of claim 14, wherein the abnormal sound detection module is specifically configured to:

calculating a sampling value corresponding to each sound source signal after filtering processing by adopting the human ear auditory model, and multiplying the sampling value by the reference voltage of analog-to-digital conversion to obtain a voltage value corresponding to each sound source signal;

calculating the voltage value corresponding to each sound source signal and the ratio of the voltage value to the sensitivity of the recording element to obtain the sound pressure of each sound source signal;

the sound pressure level of each sound source signal is calculated by the following formula:

SPL＝20×lg(P _e /P _ref )；

16. The system of claim 11, wherein the abnormal sound detection module is specifically configured to:

when the average spectral kurtosis of each sound source signal is smaller than a spectral kurtosis threshold, the average spectral peak of each sound source signal is smaller than a spectral peak threshold, and the sound pressure level of each sound source signal is smaller than a sound pressure level threshold, determining that abnormal sound does not exist in the cooling fan;

determining that the cooling fan has abnormal sound when the average spectral kurtosis of at least one of the sound source signals is greater than or equal to the spectral kurtosis threshold, and/or the average spectral peak of at least one of the sound source signals is greater than or equal to the spectral peak threshold, and/or the sound pressure level of at least one of the sound source signals is greater than or equal to the sound pressure level threshold.

17. The system of claim 10, wherein the fan control module comprises a superordinate controller, a voltage output module and a counter module, the superordinate controller being electrically connected to the voltage output module and the counter module, respectively, the voltage output module and the counter module being further electrically connected to the cooling fan;

the upper controller is used for sending a control signal to the voltage output module;

the voltage output module is used for providing a voltage signal for the cooling fan according to the control signal; the voltage signal is used for driving the cooling fan to operate;

the counter module is used for detecting the fan rotating speed in the running process of the cooling fan and sending the fan rotating speed to the upper controller;

the upper controller is also used for calculating the rotation speed deviation between the rotation speed of the fan and the preset rotation speed;

the upper controller is also used for determining a voltage compensation value according to the rotating speed deviation;

the upper controller is further configured to adjust the control signal sent to the voltage output module according to the voltage compensation value, so as to adjust the voltage signal provided to the cooling fan by the voltage output module; the adjusted voltage signal is used for adjusting the fan rotating speed in the running process of the cooling fan to the preset rotating speed.

18. The system of any of claims 10 to 17, wherein the at least one sound recording element comprises a first sound recording element and a second sound recording element, the first sound recording element and the second sound recording element being located on opposite sides of the test chassis, respectively;