CN112097893A - Noise source positioning method and system - Google Patents
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Abstract
The application provides a noise source positioning method and system. The noise source positioning method is used for positioning an action component generating abnormal noise in a micro device, and comprises the following steps: acquiring the motion characteristic frequency of a preset action part of the micro device; acquiring a first vibration spectrum of the preset action component when the micro device has abnormal noise and a second vibration spectrum of the preset action component when the micro device has no abnormal noise; determining the noise characteristic frequency of the micro device according to the first vibration spectrum and the second vibration spectrum; and determining an action component generating abnormal noise in the micro device according to the motion characteristic frequency and the noise characteristic frequency of the preset action component. The noise source positioning method can more accurately position the noise source, improves the positioning precision and the position resolution, and can effectively position the part generating the light-weight noise in the micro device.
Description
Technical Field
The invention relates to the technical field of noise detection, in particular to a method and a system for positioning a noise source.
Background
Noise is a common problem for mechanical, electromechanical products. The generation of noise not only has influence on the comfort of people and harms the physical and mental health of people, but also has strong correlation with the reliability problem of products. For products, the occurrence of noise problems often means that the products have reliability problems in terms of mechanical structures, and are generally caused by poor structural design, and long-term use of the products under the poor structural design can cause failure modes such as abrasion of the mechanical products. Therefore, the identification and localization of noise sources is critical to noise control. The problem of structural noise is solved by accurately positioning the source of noise, analyzing the mechanism of noise generation and further analyzing the propagation path, and then taking corresponding improvement measures aiming at the source of noise, the generation mechanism and the propagation path.
The traditional noise source positioning method mainly comprises a sound pressure test method and an acoustic array test method. However, both of these two testing methods have high environmental requirements, are easily interfered by external noise, and have low position resolution, which is not suitable for positioning the noise source of the micro device.
Disclosure of Invention
Therefore, it is necessary to provide an improved noise source positioning method and system for solving the problems that the conventional noise positioning method is low in position resolution, not suitable for micro devices, prone to being interfered by external noise and large in error.
A noise source positioning method for positioning an action part generating abnormal noise in a micro device, comprising:
acquiring the motion characteristic frequency of a preset action part of the micro device;
acquiring a first vibration spectrum of the preset action component when the micro device has abnormal noise and a second vibration spectrum of the preset action component when the micro device has no abnormal noise;
determining the noise characteristic frequency of the micro device according to the first vibration spectrum and the second vibration spectrum;
and determining an action component generating abnormal noise in the micro device according to the motion characteristic frequency and the noise characteristic frequency of the preset action component.
According to the noise source positioning method, the action component generating abnormal noise in the micro device is positioned from the aspect of vibration according to the homology of noise and vibration and the correlation between the noise and the motion frequency of the component, so that the interference of external noise can be avoided, and the effective positioning of the action component generating light-weight (namely low-decibel) noise in the micro device is facilitated; in addition, compared with the traditional sound pressure testing method and the traditional sound array testing method, the method has higher positioning precision and position resolution.
In one embodiment, the obtaining a first vibration spectrum of the preset action component when the micro device has abnormal noise includes driving the micro device to act under a first working condition; if the micro device has abnormal noise, acquiring a first vibration spectrum of the preset action part; the step of obtaining a second vibration spectrum of the preset action component when the micro device has no abnormal noise comprises the step of driving the micro device to act under a second working condition; and if the micro device has no abnormal noise, acquiring a second vibration spectrum of the preset action component.
In one embodiment, the obtaining a first vibration spectrum of the preset action component when the micro device has abnormal noise comprises providing a first micro device which has abnormal noise when driven under a third working condition; acquiring a first vibration spectrum of a preset action part of the first micro device when the first micro device is driven under the third working condition; the acquiring of the second vibration spectrum of the preset action component when the micro device has no abnormal noise comprises providing a second micro device which has no abnormal noise when driven under a third working condition; and acquiring a second vibration spectrum of a preset action part of the second micro device when the second micro device is driven under the third working condition.
In one embodiment, the obtaining a first vibration spectrum of the preset action component when the micro device has abnormal noise includes obtaining first time domain vibration data of the preset action component when the micro device has abnormal noise; performing Fourier transform on the first time domain vibration data to obtain a first vibration spectrum; the obtaining of the second vibration spectrum of the preset action component when the micro device has no abnormal noise comprises obtaining second time domain vibration data of the preset action component when the micro device has no abnormal noise; and performing Fourier transform on the second time domain vibration data to obtain the second vibration spectrum.
In one embodiment, the preset action component has a plurality of action components, and the determining of the action component generating abnormal noise in the micro device according to the motion characteristic frequency and the noise characteristic frequency of the preset action component comprises: comparing the motion characteristic frequency of the preset action part with the noise characteristic frequency one by one, and if the fundamental frequency or the frequency multiplication of the motion characteristic frequency of a preset action part is matched with the noise characteristic frequency, determining the preset action part as an action part generating abnormal noise in the micro device.
The application also provides a noise source positioning system.
A noise source localization system for localizing an action part generating abnormal noise in the micro device by the noise source localization method as described above, comprising:
the driving device is connected with the micro device and used for driving the micro device to act;
the vibration measuring device is arranged around the micro device and used for recording the vibration of a preset action part of the micro device;
the data acquisition system is connected with the vibration measurement device and is used for acquiring time domain vibration data of the preset action component; and the number of the first and second groups,
and the processing system is used for receiving the time domain vibration data and determining the vibration spectrum of the preset action component according to the time domain vibration data.
According to the noise source positioning system, the vibration of the preset action part is recorded through the vibration measuring device, and the vibration spectrum of the preset action part is obtained through the processing system, so that the action part generating abnormal noise in the micro device can be positioned from the aspect of vibration according to the noise source positioning method, the interference of external noise can be avoided, and the action part generating light-weight (namely low-decibel) noise in the micro device can be effectively positioned with high precision and high resolution.
In one embodiment, the vibration measuring device comprises a non-contact vibration measuring device, and the non-contact vibration measuring device is used for forming at least one test site on the surface of each preset action component so as to record the vibration of the preset action component.
In one embodiment, the micro device further comprises a mounting fixture for fixing the micro device.
In one embodiment, the time-domain vibration data includes at least one of displacement data, velocity data, and acceleration data of the preset action component.
The application also provides a noise source positioning system.
A noise source localization system for localizing an action part generating abnormal noise in the micro device, comprising:
a mounting fixture for securing the micro device;
the driving device is connected with the micro device and used for driving the micro device to act;
the vibration measuring device is arranged around the micro device and used for recording the vibration of the preset action part of the micro device when the micro device has abnormal noise and the vibration of the preset action part of the micro device when the micro device has no abnormal noise;
the data acquisition system is connected with the vibration measurement device and is used for acquiring and storing time domain vibration data of the preset action part; and the number of the first and second groups,
the processing system is connected with the data acquisition system and stores the motion characteristic frequency of the preset action component, and is used for receiving the time domain vibration data, determining the vibration spectrum of the preset action component according to the time domain vibration data, determining the noise characteristic frequency of the micro device according to the vibration spectrum of the preset action component, and determining the action component generating abnormal noise in the micro device according to the motion characteristic frequency of the preset action component and the noise characteristic frequency.
The noise source positioning system can automatically position the action part generating the light-weight abnormal noise in the micro device, has high positioning accuracy and higher position resolution, and can better meet the noise source positioning requirement of the micro device.
Drawings
FIG. 1 is a schematic flow chart illustrating a noise source positioning method according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a noise source positioning system according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a noise source localization system according to another embodiment of the present application;
FIG. 4 is a first vibration spectrum of an embodiment of the present application;
FIG. 5 is a second vibration spectrum of an embodiment of the present application.
The reference numerals of the various elements in the figures denote the following:
10. the system comprises a noise source positioning system, 100, a micro device, 200, a driving device, 300, a vibration measuring device, 400, a data acquisition system, 500, a mounting fixture, 600, a mounting table, 700 and a processing system.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "upper," "lower," "front," "rear," "circumferential," and the like are based on the orientation or positional relationship shown in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The traditional noise source positioning method mainly comprises a sound pressure test method and an acoustic array test method.
The sound pressure testing method judges the influence degree of each sound source on the product by taking the sound pressure level as a measurement standard, and then identifies the noise source. And measuring the sound pressure level of each sound source part through a near field test, and comparing to obtain the contribution of each sound source to the noise. The sound pressure testing method has higher requirements on the measuring environment and is easily interfered by external noise; in addition, the position resolution of the method is poor, accurate positioning analysis cannot be carried out on small-size products, and a mechanism generated by a noise source cannot be explained.
The acoustic array test method is based on a sensor array measurement technology, and generates sound field distribution of sound on a plane through an array signal processing algorithm according to a beam forming principle and a phased array principle by measuring signal amplitude and phase difference from sound waves in a certain space to each sensor, so that the position of a sound source is determined, and the sound source is visualized in a cloud picture mode. The acoustic array test method needs a stable test environment, so that the acoustic array test method is easily interfered by external noise, more microphones need to be configured, and the test system is difficult to build; in addition, the method has poor position accuracy and sound accuracy, is generally suitable for large-scale equipment, is not suitable for analysis of miniature parts, and cannot explain the mechanism of noise source generation.
The noise in the device is usually caused by vibration when the internal operating member operates. Under the normal operation state of the device, the vibration magnitude generated by the action part is small, and the noise is usually small to be negligible; in the abnormal operation state of the device, the vibration generated by the action component is large in magnitude and the noise is obviously increased. Therefore, under the two states of normal operation and abnormal operation of the device, the vibration spectrum (including the frequency information of vibration) of the action component on the frequency domain has obvious difference, the characteristic frequency point of the difference has close relation with the motion characteristic frequency corresponding to the action component, and the specific action component generating noise can be positioned by comparing the characteristic frequency point of the difference and the motion characteristic frequency of the action component. On the other hand, since the noise is caused by improper matching of the action components, the mechanism of noise generation can be explained through analysis of the action components, and the matching of the action components is optimized correspondingly so as to eliminate the noise.
In view of the above, in order to overcome the deficiencies of the prior art, the present application provides an improved noise source positioning method for positioning an action component generating abnormal noise in a micro device. Referring to fig. 1, the noise source positioning method of the present application includes the following steps:
s101, acquiring the motion characteristic frequency of a preset action part of the micro device;
through analyzing the composition, the structure and the working principle of the action part in the micro device, one or more parts which are easy to generate noise are identified and obtained, namely the preset action part referred to in the application. The preset action component correspondence may have one or more. The motion characteristic frequency refers to the characteristic frequency generated by the periodic motion of the motion part, and the inherent motion characteristic frequency of each preset motion part can be obtained through data query, physical analysis and mathematical operation, for example, the motion characteristic frequency of the sun gear-planet gear meshing in the planetary gear box is 1100Hz, the motion characteristic frequency of the planet gear-gear ring meshing is 862.7Hz and the like.
S102, acquiring a first vibration spectrum of a preset action part when the micro device has abnormal noise and a second vibration spectrum of the preset action part when the micro device has no abnormal noise;
by designing a test scheme, a test environment (such as a laboratory environment), test equipment, a test fixture, an operation condition, a test site, a test physical quantity and the like are selected to build a test system of the micro device. Driving the micro device to act in various test states, and recording first time domain vibration data of a preset action part when the micro device has abnormal noise and second time domain vibration data of the preset action part when the micro device has no abnormal noise, wherein the time domain vibration data comprise real-time test data of displacement, speed and acceleration of the preset action part; after the first time domain vibration data and the second time domain vibration data are obtained, Fourier transform analysis can be respectively carried out, the first time domain vibration data are converted into corresponding first vibration spectrums, and the second time domain vibration data are converted into corresponding second vibration spectrums. It should be noted that, besides the fourier transform analysis, the transformation method for the time-domain vibration data further includes methods such as wavelet transform analysis, integrated empirical mode analysis, Gabor transform analysis, and short-time fourier transform analysis, and a skilled person may select the method according to actual requirements, which is not limited in this application.
S103, determining the noise characteristic frequency of the micro device according to the first vibration spectrum and the second vibration spectrum;
by observing and comparing the frequency points with the maximum vibration response on the first vibration spectrum and the second vibration spectrum, the frequency points with the maximum vibration response (without abnormal noise) on the first vibration spectrum which do not cause the abnormal noise can be excluded according to the frequency points with the maximum vibration response (without the abnormal noise) on the second vibration spectrum, so that the maximum vibration response frequency points with the abnormal noise on the first vibration spectrum can be obtained, and the maximum vibration response frequency points with the abnormal noise on the part are the noise characteristic frequency of the micro device.
S104, determining an action component generating abnormal noise in the micro device according to the motion characteristic frequency and the noise characteristic frequency of the preset action component;
after the noise characteristic frequency is obtained, the action component generating abnormal noise in the micro device is determined by performing correlation analysis on the motion characteristic frequency of the preset action component and the noise characteristic frequency. Specifically, the difference between the motion characteristic frequency and the noise characteristic frequency of the preset motion component may be calculated, and a difference threshold may be set, so that when the difference between the motion characteristic frequency and the noise characteristic frequency of a certain preset motion component is less than or equal to the difference threshold, the preset motion component may be determined as one of the motion components or components of the micro device that generates abnormal noise.
According to the noise source positioning method, the action component generating abnormal noise in the micro device is positioned from the aspect of vibration according to the homology of noise and vibration and the correlation between the noise and the motion frequency of the component, so that the interference of external noise can be avoided, and the effective positioning of the action component generating light-weight (namely low-decibel) noise in the micro device is facilitated; in addition, compared with the traditional sound pressure testing method and the traditional sound array testing method, the method has higher positioning precision and position resolution.
Because the working state of the micro device is determined by the micro device (namely the test sample) and the test working condition together, the micro device and the test working condition can be combined and matched, and two working states of abnormal noise and no abnormal noise of the micro device can be obtained by controlling variables.
In one embodiment, for the same micro device, a first vibration spectrum corresponding to noise in a first working condition and a second vibration spectrum corresponding to no noise in a second working condition can be obtained. Specifically, acquiring a first vibration spectrum of a preset action part when the micro device has abnormal noise, wherein the step of driving the micro device to act under a first working condition is included; if the micro device has abnormal noise, acquiring a first vibration spectrum of a preset action part; acquiring a second vibration spectrum of a preset action part when the micro device has no abnormal noise, wherein the second vibration spectrum comprises the step of driving the micro device to act under a second working condition; and if the micro device has no abnormal noise, acquiring a second vibration spectrum of the preset action part.
In another embodiment, a first vibration spectrum corresponding to a first micro device that is noisy when driven under the operating condition and a second vibration spectrum corresponding to a second micro device that is quiet when driven under the operating condition may be obtained for the same operating condition. Specifically, acquiring a first vibration spectrum of a preset action part when the micro device has abnormal noise, wherein the first vibration spectrum comprises a first micro device with abnormal noise when the micro device is driven under a third working condition; acquiring a first vibration spectrum of a preset action part of the first micro device when the first micro device is driven under a third working condition; acquiring a second vibration spectrum of a preset action part when the micro device has no abnormal noise, wherein the second vibration spectrum comprises a second micro device which has no abnormal noise when being driven under a third working condition; and acquiring a second vibration spectrum of the preset action part of the second micro device when the second micro device is driven under a third working condition.
It should be noted that, in the manufacturing and assembling process, the micro device may include good products and non-good products due to different manufacturing precision of the parts or interference of other external factors. The non-defective products meet the preset production standard, and may be the second micro device without abnormal noise in the third working condition in the above embodiment, and the non-defective products do not meet the preset production standard, and may be the first micro device with abnormal noise in the third working condition in the above embodiment.
In the two embodiments, the indexes of the operating condition may include a pulse frequency of a driving signal of the motor, a magnitude of a voltage and a current, a load weight, an ambient temperature, and the like, and when a value of any one of the indexes is changed, it may be determined that the operating condition of the micro device is changed.
In an exemplary embodiment, when the preset action part has a plurality of action parts, determining an action part generating abnormal noise in the micro device according to a motion characteristic frequency and a noise characteristic frequency of the preset action part, includes: comparing the motion characteristic frequency of the preset action component with the noise characteristic frequency one by one, and if the fundamental frequency or the frequency multiplication of the motion characteristic frequency of the preset action component is matched with the noise characteristic frequency, determining the preset action component as an action component generating abnormal noise in the micro device. Specifically, the motion characteristic frequencies of a plurality of preset motion components can be differentiated from the noise characteristic frequency one by one, a difference threshold value is set, and when the difference between the motion characteristic frequency and the noise characteristic frequency of a certain preset motion component is smaller than or equal to the difference threshold value, the preset motion component can be determined to be one of the motion components or components generating abnormal noise in the micro device.
Referring to fig. 2, the present application further provides a noise source positioning system 10 for positioning the operating components of the micro device 100 generating abnormal noise by the noise source positioning method as described above.
The noise source localization system 10 includes a driving device 200. The driving device 200 is connected to the micro device 100, and can drive the micro device 100 to operate under different operating conditions.
The vibration measuring device 300 is disposed around the micro device 100 and is used for recording the vibration of the preset action component of the micro device 100 when abnormal noise exists in the micro device 100 and the vibration of the preset action component of the micro device 100 when abnormal noise does not exist in the micro device 100. Further, the vibration measuring device 300 may be a non-contact vibration measuring device, for example, a laser vibration meter may be used for testing. At the moment, the laser vibration meter can emit a plurality of beams of laser and form a laser test site on the surface of each preset action part so as to record the vibration corresponding to the preset action part. By the non-contact vibration measurement, the test error caused by contact can be avoided, and particularly in the vibration measurement of a micro device, the test error can be caused by a few contact disturbances, so that the non-contact vibration measurement device is particularly important in the noise source positioning system.
And the data acquisition system 400 is connected with the vibration measurement device 300 and is used for acquiring and storing time domain vibration data of the preset action component. Specifically, the time-domain vibration data includes at least one of displacement data, velocity data, and acceleration data of the preset action component. Furthermore, technicians can take out the time domain vibration data of the preset action component in a copying mode to perform subsequent processing and comparison operations.
The processing system 700 is configured to receive the time-domain vibration data of the preset action component brought out from the data acquisition system 400, and determine a vibration spectrum of the preset action component according to the time-domain vibration data.
After obtaining the vibration spectrum of the preset action component, the technician can determine the action component generating abnormal noise in the micro device 100 according to the positioning method described above.
In the noise source positioning system, the vibration of the preset action part is recorded by the vibration measuring device 300 and the vibration spectrum of the preset action part is obtained by the processing system 700, so that the positioning of the part generating abnormal noise in the micro device 100 from the aspect of the vibrology according to the noise source positioning method is facilitated, the interference of external noise can be avoided, the noise source can be positioned more accurately, and in addition, the part generating light-weight noise in the micro device 100 can be effectively positioned with high precision and high resolution.
The noise source positioning system utilizes the homology of noise and vibration, tests the vibration characteristics of the preset action part by means of a precise vibration measuring instrument, determines the noise source through the frequency spectrum analysis of time domain vibration data and the characteristic frequency analysis comparison based on the motion characteristics, and finally effectively solves the noise test positioning problem of a precise mechanical structure.
Further, the noise source localization problem of the micro device with moving parts can be solved by the noise source localization method and system of the present application.
In an exemplary embodiment, the noise source locating system further includes a mounting fixture 500 for securing the micro device 100. Specifically, the mounting fixture 500 can firmly fix the micro device 100, and does not generate large shake when the micro device 100 is operated to generate vibration, which is beneficial to avoiding the micro device 100 from generating extra vibration during testing. It is understood that the structural design of the mounting fixture 500 is not exclusive and that the technician may adapt the structure of the mounting fixture 500 to the micro device 100 having different actuation configurations so that the mounting fixture 500 can always securely hold the micro device 100. Further, the noise source positioning system further comprises an installation table 600, so that each testing device can be stably placed, and the vibration measurement effect is guaranteed.
In another embodiment, referring to fig. 3, the noise source positioning system 10 of the present application includes a mounting fixture 500 for fixing the micro device 100; a driving device 200 connected to the micro device 100 for driving the micro device 100 to operate; a vibration measuring device 300 disposed around the micro device 100 for recording the vibration of the preset operation part of the micro device 100 when the micro device 100 has abnormal noise and the vibration of the preset operation part of the micro device 100 when there is no abnormal noise; the data acquisition system 400 is connected with the vibration measurement device 300 and is used for acquiring and storing time domain vibration data of a preset action part; and the processing system 700 is connected with the data acquisition system 400 and stores the motion characteristic frequency of the preset action component, and the processing system 700 is used for receiving the time-domain vibration data, determining the vibration spectrum corresponding to the preset action component according to the time-domain vibration data, determining the noise characteristic frequency of the micro device 100 according to the vibration spectrum of the preset action component, and determining the action component generating abnormal noise in the micro device 100 according to the motion characteristic frequency and the noise characteristic frequency of the preset action component.
The noise source positioning system can automatically position the action part generating abnormal noise in the micro device, has high positioning accuracy and higher position resolution, and can better meet the noise source positioning requirement of the micro device.
The noise localization method and system of the present application will be described below by way of a specific embodiment.
An actual micro device was selected with dimensions of about 13mm by 16mm by 4 mm. In the manufacturing process, the micro devices with partial batches are easy to generate abnormal noise. Therefore, the noise source generating abnormal noise in the micro device is located by the following steps.
(1) Acquiring the motion characteristic frequency of a preset action part of the micro device;
first, the components in which noise is easily generated need to be analyzed in conjunction with the operation principle of the micro device. The micro device drives a stepping motor to rotate by sending an electric pulse signal, and then reduces the speed and increases the thrust sequentially through the primary speed reduction of a planetary gear box and the secondary speed reduction of a secondary speed reducer. The part of the micro device emits abnormal noise under the condition that the pulse frequency of the driving signal is 2000pps, and possible noise sources are a planetary gear box and a secondary speed reducer through preliminary investigation.
According to the physical structure parameters of the motor, the rotation frequency of the motor shaft of the stepping motor is 100Hz, so that the characteristic frequency of the motion of the gear meshing and the rotation of the planetary gear box and the secondary speed reducer in the motion state can be obtained according to the structure transmission relation, and the analysis result is shown in Table 1.
TABLE 1 characteristic frequency of motion of planetary gear box and two-stage speed reducer
(2) Acquiring a first vibration spectrum of a preset action part when the micro device has abnormal noise and a second vibration spectrum of the preset action part when the micro device has no abnormal noise;
specifically, the vibration test is performed by using the noise source positioning system 10 as shown in fig. 2, wherein the vibration measuring device uses a precision laser vibration measuring apparatus. The method comprises the steps of selecting a micro device G1 without abnormal noise and a micro device F1 with abnormal noise under the drive of a pulse frequency of a driving signal of a stepping motor of 2000pps, and respectively obtaining second time domain vibration data of a planetary gear box and a secondary speed reducer of the micro device G1 under the drive of the pulse frequency of the driving signal of 2000pps and first time domain vibration data of the planetary gear box and the secondary speed reducer of the micro device F1 under the drive of the pulse frequency of the driving signal of 2000pps through laser vibration measurement equipment, wherein the time domain vibration data are collected by speed vibration quantity which is collected and stored by a data collection system 400.
The obtained first time domain vibration data and the second time domain vibration data are processed through special analysis software, and a corresponding first vibration spectrum (shown in fig. 4) and a corresponding second vibration spectrum (shown in fig. 5) are obtained.
(3) Determining the noise characteristic frequency of the micro device according to the first vibration spectrum and the second vibration spectrum;
as shown in fig. 4, the maximum vibration response of the micro device F1 occurs at 748.09Hz, 1019.20Hz, 1489.41Hz, 2035.87Hz, etc., and as shown in fig. 5, the maximum vibration response of the micro device G1 occurs at 1014.97Hz, 2031.63 Hz. Analysis shows that the maximum vibration response frequency point of G1 is consistent with the cogging torque ripple frequency and the current harmonic torque ripple frequency of the claw pole stepping motor, and corresponding to fig. 4, the maximum vibration response frequency points 1019.20Hz and 2035.87Hz in fig. 4 can be removed, so that the remaining 748.09Hz and 1489.41Hz are the noise characteristic frequency of the micro device F1.
(4) Determining an action component generating abnormal noise in the micro device according to the motion characteristic frequency and the noise characteristic frequency of the preset action component;
since 748.09Hz and 1489.41Hz are noise characteristic frequencies of the micro device F1, it can be known that the noise characteristic frequencies respectively correspond to the fundamental frequency and the frequency multiplication of 2 times of the meshing frequency of the planet gear and the ring gear, so that the position of the micro device F1 where abnormal noise is generated can be determined as the meshing position of the planet gear and the ring gear, corresponding to the data in table 1.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A noise source positioning method for positioning an operation member generating abnormal noise in a micro device, comprising:
acquiring the motion characteristic frequency of a preset action part of the micro device;
acquiring a first vibration spectrum of the preset action component when the micro device has abnormal noise and a second vibration spectrum of the preset action component when the micro device has no abnormal noise;
determining the noise characteristic frequency of the micro device according to the first vibration spectrum and the second vibration spectrum;
and determining an action component generating abnormal noise in the micro device according to the motion characteristic frequency and the noise characteristic frequency of the preset action component.
2. The noise source positioning method according to claim 1,
the acquiring of the first vibration spectrum of the preset action component when the micro device has abnormal noise comprises,
driving the micro device to act under a first working condition;
if the micro device has abnormal noise, acquiring a first vibration spectrum of the preset action part;
the obtaining of the second vibration spectrum of the preset action component when the micro device has no abnormal noise comprises,
driving the micro device to act under a second working condition;
and if the micro device has no abnormal noise, acquiring a second vibration spectrum of the preset action component.
3. The noise source positioning method according to claim 1,
the acquiring of the first vibration spectrum of the preset action component when the micro device has abnormal noise comprises,
providing a first micro device having abnormal noise when driven under a third condition;
acquiring a first vibration spectrum of a preset action part of the first micro device when the first micro device is driven under the third working condition;
the obtaining of the second vibration spectrum of the preset action component when the micro device has no abnormal noise comprises,
providing a second micro device without abnormal noise when driven under a third working condition;
and acquiring a second vibration spectrum of a preset action part of the second micro device when the second micro device is driven under the third working condition.
4. The noise source positioning method according to any one of claims 1 to 3,
the acquiring of the first vibration spectrum of the preset action component when the micro device has abnormal noise comprises,
acquiring first time domain vibration data of the preset action component when the micro device has abnormal noise;
performing Fourier transform on the first time domain vibration data to obtain a first vibration spectrum;
the obtaining of the second vibration spectrum of the preset action component when the micro device has no abnormal noise comprises,
acquiring second time domain vibration data of the preset action component when the micro device has no abnormal noise;
and performing Fourier transform on the second time domain vibration data to obtain the second vibration spectrum.
5. The noise source positioning method according to claim 4, wherein the preset action component has a plurality of action components, and the determining of the action component generating abnormal noise in the micro device according to the motion characteristic frequency and the noise characteristic frequency of the preset action component comprises:
comparing the motion characteristic frequency of the preset action part with the noise characteristic frequency one by one, and if the fundamental frequency or the frequency multiplication of the motion characteristic frequency of a preset action part is matched with the noise characteristic frequency, determining the preset action part as an action part generating abnormal noise in the micro device.
6. A noise source localization system for localizing an action part generating abnormal noise in said micro device by the noise source localization method according to any one of claims 1 to 5, comprising:
the driving device is connected with the micro device and used for driving the micro device to act;
the vibration measuring device is arranged around the micro device and used for recording the vibration of a preset action part of the micro device;
the data acquisition system is connected with the vibration measurement device and is used for acquiring and storing time domain vibration data of the preset action part; and the number of the first and second groups,
and the processing system is used for receiving the time domain vibration data and determining the vibration spectrum of the preset action component according to the time domain vibration data.
7. The noise source positioning system according to claim 6, wherein the vibration measuring device comprises a non-contact vibration measuring device for forming at least one test site on a surface of each of the preset action components to record vibration of the preset action components.
8. The noise source positioning system according to claim 6 or 7, further comprising a mounting fixture for fixing the micro device.
9. The noise source positioning system of claim 6, wherein the time domain vibration data comprises at least one of displacement data, velocity data, and acceleration data of the preset action component.
10. A noise source localization system for localizing an action part generating abnormal noise in a micro device, comprising:
a mounting fixture for securing the micro device;
the driving device is connected with the micro device and used for driving the micro device to act;
the vibration measuring device is arranged around the micro device and used for recording the vibration of the preset action part of the micro device when the micro device has abnormal noise and the vibration of the preset action part of the micro device when the micro device has no abnormal noise;
the data acquisition system is connected with the vibration measurement device and is used for acquiring and storing time domain vibration data of the preset action part; and the number of the first and second groups,
the processing system is connected with the data acquisition system and stores the motion characteristic frequency of the preset action component, and is used for receiving the time domain vibration data, determining the vibration spectrum of the preset action component according to the time domain vibration data, determining the noise characteristic frequency of the micro device according to the vibration spectrum of the preset action component, and determining the action component generating abnormal noise in the micro device according to the motion characteristic frequency of the preset action component and the noise characteristic frequency.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858778A (en) * | 2010-05-28 | 2010-10-13 | 浙江大学 | Vibration monitoring-based wind generator set automatic fault diagnosis method |
| JP2012112799A (en) * | 2010-11-25 | 2012-06-14 | Tokyo Metropolitan Univ | Abnormality detection method and device for vibrator |
| JP2015184029A (en) * | 2014-03-20 | 2015-10-22 | 原子燃料工業株式会社 | Diagnostic method for swing check valve |
| CN107436236A (en) * | 2016-05-25 | 2017-12-05 | 长城汽车股份有限公司 | The noise detecting method and detecting system of vehicle gear box |
-
2020
- 2020-08-06 CN CN202010783013.6A patent/CN112097893A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858778A (en) * | 2010-05-28 | 2010-10-13 | 浙江大学 | Vibration monitoring-based wind generator set automatic fault diagnosis method |
| JP2012112799A (en) * | 2010-11-25 | 2012-06-14 | Tokyo Metropolitan Univ | Abnormality detection method and device for vibrator |
| JP2015184029A (en) * | 2014-03-20 | 2015-10-22 | 原子燃料工業株式会社 | Diagnostic method for swing check valve |
| CN107436236A (en) * | 2016-05-25 | 2017-12-05 | 长城汽车股份有限公司 | The noise detecting method and detecting system of vehicle gear box |
Non-Patent Citations (2)
| Title |
|---|
| 杨璐: "行星齿轮箱的振动响应分析与故障诊断", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅱ辑》 * |
| 潘高元: "车辆变速箱多相关振动噪声源识别方法研究", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅱ辑》 * |
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