CN114660452A - Method and device for detecting abnormality of generator - Google Patents
Method and device for detecting abnormality of generator Download PDFInfo
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- CN114660452A CN114660452A CN202011548907.3A CN202011548907A CN114660452A CN 114660452 A CN114660452 A CN 114660452A CN 202011548907 A CN202011548907 A CN 202011548907A CN 114660452 A CN114660452 A CN 114660452A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
Abstract
The application discloses an abnormity detection method and device of a generator, wherein the method comprises the following steps: collecting at least one decibel value of a plurality of preset directions of a generator to be measured in work; determining the current noise order of each preset position according to at least one decibel value of each preset position; and when the current noise order is larger than the preset order, judging that the generator to be detected is abnormal. Therefore, the problem that whether the generator has electromagnetic noise abnormity or not can not be accurately detected only through sound pressure level detection equipment at present is solved.
Description
Technical Field
The present disclosure relates to generator detection technologies, and in particular, to a method and an apparatus for detecting an abnormality of a generator.
Background
At present, the electromagnetic noise abnormity of the generator is usually detected by sound pressure level detection equipment before the generator leaves a factory, wherein the sound pressure level detection equipment is used for detecting decibel values.
However, the sound pressure level detection device can only test the decibel magnitude of the generator in operation, and cannot accurately judge the magnitude of the electromagnetic noise, so that the electromagnetic noise abnormality detection is easily inaccurate, the accuracy and the reliability of the electromagnetic noise abnormality detection of the generator are greatly reduced, and the problem to be solved is solved.
Content of application
The application provides a method and a device for detecting the abnormality of a generator, which are used for solving the problem that whether the generator has electromagnetic noise abnormality cannot be accurately detected only by sound pressure level detection equipment at present.
An embodiment of a first aspect of the present application provides an abnormality detection method for a generator, including the following steps: collecting at least one decibel value of a plurality of preset directions of a generator to be measured in work; determining the current noise order of each preset position according to at least one decibel value of each preset position; and when the current noise order is larger than a preset order, judging that the generator to be detected is abnormal.
Further, before determining the current noise order of each preset position according to at least one decibel value of each preset position, the method further includes: and pre-establishing a relation table between decibel values and noise orders so as to query the relation table to obtain the current noise order.
Further, still include: when the generator to be tested works, receiving a noise instruction input by a tester; and generating the preset order according to the noise instruction.
Further, the determining the current noise order of each preset position according to at least one decibel value of each preset position includes: determining the current noise order of each preset position according to each decibel value; and taking the highest noise order in the current noise orders of all preset directions as the current noise order.
Further, gather at least one decibel value in a plurality of predetermined positions of the generator that awaits measuring when working, include: setting the operating frequency and the motor speed of the generator to be tested in 1/3 octaves, and collecting at least one decibel value of the preset directions.
An embodiment of a second aspect of the present application provides an abnormality detection apparatus for a generator, including: the acquisition module is used for acquiring at least one decibel value of a plurality of preset directions of the generator to be measured when the generator to be measured works; the determining module is used for determining the current noise order of each preset position according to at least one decibel value of each preset position; and the judging module is used for judging that the generator to be detected is abnormal when the current noise order is greater than a preset order.
Further, still include: and the calibration module is used for establishing a relation table between the decibel value and the noise scale in advance before determining the current noise scale of each preset azimuth according to at least one decibel value of each preset azimuth so as to query the relation table to obtain the current noise scale.
Further, still include: and the generation module is used for receiving a noise instruction input by an inspector when the generator to be tested works and generating the preset order according to the noise instruction.
Further, the determining module is further configured to determine a current noise order of each preset position according to each decibel value, and use a highest noise order of the current noise orders of all preset positions as the current noise order.
Further, the acquisition module is used for setting the operating frequency and the motor speed of the generator to be tested in 1/3 octaves, and acquiring at least one decibel value of the preset directions.
The method comprises the steps of determining the current noise order according to the decibel value of the generator to be detected, accurately determining the size of electromagnetic noise according to the current noise order, and judging that the generator to be detected is abnormal when the current noise order is larger than the preset order, so that the size of the electromagnetic noise can be accurately determined only through sound pressure level detection equipment, whether the electromagnetic noise abnormality exists in the generator can be accurately detected, and the accuracy and reliability of abnormal detection of the generator can be improved. Therefore, the problem that whether the generator has electromagnetic noise abnormity or not can not be accurately detected only through sound pressure level detection equipment at present is solved.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of an abnormality detection method for a generator according to an embodiment of the present application;
FIG. 2 is a diagram illustrating an example of an arrangement of a sound pressure level detecting apparatus according to an embodiment of the present application;
FIG. 3 is a diagram illustrating an example of noise orders according to an embodiment of the present application;
fig. 4 is an exemplary diagram of an abnormality detection apparatus of a generator according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
An abnormality detection method and apparatus for a generator according to an embodiment of the present application will be described with reference to the drawings. In the method, the current noise order is determined according to the decibel value of the generator to be detected, the size of electromagnetic noise is accurately determined according to the current noise order, and when the current noise order is larger than the preset order, the abnormality of the generator to be detected is judged, so that the size of the electromagnetic noise can be accurately determined only through the sound pressure level detection equipment, the electromagnetic noise abnormality of the generator is accurately detected, and the accuracy and the reliability of the abnormality detection of the generator are improved. Therefore, the problem that whether the generator has electromagnetic noise abnormity or not can not be accurately detected only through sound pressure level detection equipment at present is solved.
Specifically, fig. 1 is a schematic flow chart of an abnormality detection method for a generator according to an embodiment of the present disclosure.
As shown in fig. 1, the abnormality detection method of the generator includes the steps of:
in step S101, at least one decibel value of a plurality of preset orientations of the generator to be measured during operation is collected.
The preset position can be a plurality of positions such as the front side, the left side and the right side of the generator, and technicians in the field can acquire decibel values of a plurality of different positions according to actual measurement requirements.
The embodiment of the application can detect at least one decibel value of a plurality of set orientations through a plurality of sound pressure level detection devices. As shown in fig. 2, three positions of the front side, the left side and the right side of the generator are taken as examples, in the embodiment of the present application, a sound pressure level detection device, such as a decibel detection device, may be respectively set at a preset distance of the corresponding position of the generator to be detected, so as to collect decibel values in each position, and when the decibel values in three directions are the same, a decibel value is collected, and therefore, the collected decibel value is at least one decibel value, and the collected decibel value may be one or more. Wherein, the preset distance between three sound pressure level check out test set and the generator that awaits measuring can be the same also can be different, and the measurement personnel can set up according to actual detection demand, for example, three sound pressure level check out test set up all at the 15cm department of the generator that awaits measuring, do not do specific limit here.
In some embodiments, acquiring at least one decibel value for a plurality of preset orientations of the generator under test while in operation includes: the running frequency and the motor rotating speed of the generator to be tested are set according to 1/3 octaves, and at least one decibel value of a plurality of preset directions is collected.
It can be understood that after the generator to be tested is assembled, the embodiment of the present application establishes a limit value of the rotation speed corresponding to 1/3 octaves to perform decibel value detection on the generator to be tested.
In step S102, a current noise order of each preset position is determined according to at least one decibel value of each preset position.
It can be understood that, the embodiment of the application can directly determine the current noise order according to the decibel value detected by the sound pressure level detection equipment so as to accurately determine the size of the electromagnetic noise, and further improve the accuracy of the electromagnetic noise abnormity detection of the subsequent generator. The generator is formed by combining a stator and a rotor, and a stator coil of the generator cuts a magnetic field to generate current; when the generator coil cuts the magnetic field, the noise generated by the mechanical components or the volume of space vibrating due to the alternating electromagnetic field is called electromagnetic noise.
In this embodiment, the current noise order may be obtained by querying a relationship table according to the pre-established relationship table between the decibel value and the noise order. The relation table between the decibel value and the noise scale may be established in various ways, which is not limited herein.
As an example, the relation between decibel value and noise scale is established as follows:
(1) according to the embodiment of the application, the limit value of 1/3 octaves corresponding to the rotating speed can be set based on the sound pressure level detection equipment, as shown in table 1, so that decibel values of a plurality of generators under different frequencies and rotating speeds can be measured respectively. Wherein, the generators tested are the same type of generator.
TABLE 1
(2) In the manner shown in fig. 2, a sound pressure level detection device is arranged at the front end, the left side and the right side of the generator respectively, and the distance is 15 cm.
(3) After processing the collected data, noise orders are detected using NVH detection equipment, as shown in fig. 3.
(4) The decibel value of each stage is determined through the steps, so that a relation table between the decibel value and the noise scale can be established.
In some embodiments, determining the current noise order for each preset orientation based on at least one decibel value for each preset orientation comprises: determining the current noise order of each preset position according to each decibel value; and taking the highest noise order in the current noise orders of all the preset directions as the current noise order.
It can be understood that after a plurality of decibel values are acquired, the highest noise order in the current noise order is used as the current noise order in the embodiment of the application, so that whether the generator to be detected is abnormal or not is determined through the highest noise order, the noise size is detected through a plurality of directions, and the detection accuracy can be improved.
In step S103, when the current noise order is greater than the preset order, it is determined that the generator to be detected is abnormal.
The preset order may be set according to an actual situation, and is not specifically limited herein.
As a possible implementation mode, when the generator to be tested works, the noise instruction input by an inspector is received, and the preset order is generated according to the noise instruction.
It is understood that the embodiment of the application can determine the preset order according to the input of the inspector, so as to be used for judging the generator abnormity.
As another possible implementation manner, the preset order may also be determined in a scoring manner in the embodiment of the present application. For example, the data shown in table 1 is collected, after all the collected data are processed, an organizer can perform subjective evaluation and scoring, as shown in table 2, to determine the generators with electromagnetic anomalies according to the scoring condition of each generator, and the minimum noise order in the generators with electromagnetic anomalies is taken as a preset order.
It should be noted that, after the minimum noise order in the generator is determined in the embodiment of the present application, a decibel value corresponding to the minimum noise order may also be directly used as a preset value, and when the detected decibel value exceeds the preset value, it is determined that the generator to be detected is abnormal.
The method for detecting the abnormality of the generator according to the embodiment includes a step of pre-establishing a correspondence between decibel values and noise levels and a step of detecting the generator, and specifically includes the following steps:
s1, the order of the electromagnetic noise is judged by comparing and analyzing the electromagnetic noise of the generator, and the decibel value of each stage is confirmed after conversion, which comprises the following steps:
s1.1, after the generator is assembled, setting a limit value of the rotating speed corresponding to 1/3 octaves
S1.2, sound pressure level detection equipment is respectively arranged at the front end, the left side and the right side of the generator, and the distance is 15 cm.
S1.3, subjectively grading and evaluating the acquired data and detecting noise orders through NVH professional design;
s2, the simple NVH detection equipment is manufactured to confirm whether the product is qualified or not, and the method comprises the following steps:
s2.1, a small NVH detection room is established before the generator leaves a factory, and sound pressure level detection equipment is arranged at the front end, the left side and the right side of the generator respectively and is 15cm away.
S2.2, the generator operation console formulates operation programs of all stages, is connected with sound pressure level detection equipment at the same time, sets a decibel value target, alarms when the decibel value is exceeded, automatically carries out offline detection on the generator, and flows into the next procedure after the generator is qualified.
According to the abnormity detection method of the generator, the current noise order is determined according to the decibel value of the generator to be detected, the electromagnetic noise is accurately determined according to the current noise order, and when the current noise order is larger than the preset order, the abnormity of the generator to be detected is judged, so that the electromagnetic noise can be accurately determined only through sound pressure level detection equipment, whether the electromagnetic noise abnormity exists in the generator is accurately detected, and the abnormity detection accuracy and reliability of the generator abnormity are improved.
Next, an abnormality detection device of a generator according to an embodiment of the present application will be described with reference to the drawings.
Fig. 4 is a block diagram schematically illustrating an abnormality detection device for a generator according to an embodiment of the present application.
As shown in fig. 4, the abnormality detection device 10 for a power generator includes: an acquisition module 100, a determination module 200, and a decision module 300.
The acquisition module 100 is configured to acquire at least one decibel value of a plurality of preset orientations of the generator to be measured when the generator to be measured operates; the determining module 200 is configured to determine a current noise order of each preset position according to at least one decibel value of each preset position; the determining module 300 is configured to determine that the generator to be detected is abnormal when the current noise order is greater than the preset order.
Further, the apparatus 10 of the embodiment of the present application further includes: and a calibration module. The calibration module is used for establishing a relation table between the decibel value and the noise scale in advance before determining the current noise scale of each preset azimuth according to at least one decibel value of each preset azimuth, and obtaining the current noise scale by inquiring the relation table.
Further, the apparatus 10 of the embodiment of the present application further includes: and generating a module. The generating module is used for receiving a noise instruction input by a detector when the generator to be detected works, and generating a preset order according to the noise instruction.
Further, the determining module 200 is further configured to determine a current noise order of each preset position according to each decibel value, and use a highest noise order of the current noise orders of all the preset positions as the current noise order.
Further, the acquisition module 100 is configured to set the operating frequency and the motor speed of the generator to be measured at 1/3 octaves, and acquire at least one decibel value of a plurality of preset orientations.
It should be noted that the foregoing explanation of the embodiment of the method for detecting an abnormality of a generator is also applicable to the apparatus for detecting an abnormality of a generator of this embodiment, and will not be described herein again.
According to the abnormity detection device of the generator, the current noise order is determined according to the decibel value of the generator to be detected, the electromagnetic noise is accurately determined according to the current noise order, and when the current noise order is larger than the preset order, the abnormity of the generator to be detected is judged, so that the electromagnetic noise can be accurately determined only through sound pressure level detection equipment, whether the electromagnetic noise abnormity exists in the generator is accurately detected, and the abnormity detection accuracy and reliability of the abnormity detection of the generator are improved.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "N" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or N wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Further, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer-readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. An abnormality detection method for a generator, characterized by comprising the steps of:
collecting at least one decibel value of a plurality of preset directions of a generator to be measured in work;
determining the current noise order of each preset position according to at least one decibel value of each preset position; and
and when the current noise order is larger than a preset order, judging that the generator to be detected is abnormal.
2. The method of claim 1, further comprising, prior to determining the current noise order for each preset orientation based on at least one decibel value for each preset orientation:
and pre-establishing a relation table between decibel values and noise orders so as to query the relation table to obtain the current noise order.
3. The method of claim 1, further comprising:
when the generator to be tested works, receiving a noise instruction input by a tester;
and generating the preset order according to the noise instruction.
4. The method of claim 1, wherein said determining a current noise level for each preset orientation based on at least one decibel value for each preset orientation comprises:
determining the current noise order of each preset position according to each decibel value;
and taking the highest noise order in the current noise orders of all preset directions as the current noise order.
5. The method of claim 1, wherein collecting at least one decibel value for a plurality of predetermined orientations of the generator under test while in operation comprises:
and setting the operating frequency and the motor rotating speed of the generator to be tested in 1/3 octaves, and acquiring at least one decibel value of the preset directions.
6. An abnormality detection device for a generator, characterized by comprising:
the acquisition module is used for acquiring at least one decibel value of a plurality of preset directions of the generator to be measured when the generator to be measured works;
the determining module is used for determining the current noise order of each preset position according to at least one decibel value of each preset position; and
and the judging module is used for judging that the generator to be detected is abnormal when the current noise order is greater than a preset order.
7. The apparatus of claim 6, further comprising:
and the calibration module is used for establishing a relation table between the decibel value and the noise scale in advance before determining the current noise scale of each preset azimuth according to at least one decibel value of each preset azimuth so as to query the relation table to obtain the current noise scale.
8. The apparatus of claim 6, further comprising:
and the generation module is used for receiving a noise instruction input by a detector when the generator to be detected works, and generating the preset order according to the noise instruction.
9. The apparatus of claim 6, wherein the determining module is further configured to determine a current noise order for each predefined orientation from each decibel value, and to use a highest noise order among the current noise orders for all predefined orientations as the current noise order.
10. The apparatus of claim 6, wherein the collecting module is configured to set an operating frequency and a motor speed of the generator under test at 1/3 octaves and collect at least one decibel value for the plurality of predetermined orientations.
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| CN202011548907.3A CN114660452A (en) | 2020-12-24 | 2020-12-24 | Method and device for detecting abnormality of generator |
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| CN202011548907.3A CN114660452A (en) | 2020-12-24 | 2020-12-24 | Method and device for detecting abnormality of generator |
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