Abnormal sound testing equipment and method for product with rotating shaft

Abstract

The invention discloses abnormal sound testing equipment and method for a product with a rotating shaft. The abnormal sound testing equipment comprises a vibration transmission assembly, an audio playing assembly, an audio acquisition assembly and a control assembly. The first side of the vibration transmission assembly is provided with a test position, the audio playing assembly is arranged on the second side of the vibration transmission assembly and matched with the test position, the test position is provided with a sound wave conduction channel, a sound wave conduction gap is formed between the audio playing assembly and the vibration transmission assembly, and the audio collecting assembly is arranged on the first side of the vibration transmission assembly. The control assembly is electrically connected to the audio playing assembly and the audio collecting assembly, and the control assembly is used for sending a frequency sweeping signal with the frequency changing along with time in a preset frequency band to the audio playing assembly, collecting a sound signal through the audio collecting assembly and determining whether the target product assembly generates abnormal sound or not according to the sound signal. According to the invention, abnormal sound detection can be carried out on the target product assembly in a resonance mode to determine whether the target product assembly is poor in assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of product testing, and in particular to an abnormal sound testing device and method for a product with a rotating shaft. Background Art

[0002] An existing smart home product component includes an end cap and a rotating shaft (or rotating handle) installed on the end cap. During the production process, there may be poor assembly, resulting in loose parts (such as the rotating shaft), causing buzz (phonetic: Buzz) noise due to vibration during rotation. The buzz noise will reduce the user's product experience, so it is necessary to test the product before it leaves the factory. The relevant technology is to test the product by running the product and manually listening after the product components have completed the finished product assembly. However, this method has strong human subjectivity, low accuracy, and low efficiency, and can only test the finished product but not the local components of the product. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an abnormal sound testing device and method for a product with a rotating shaft, which can detect abnormal sound of a target product component by resonance to determine whether the target product component has a poor assembly problem.

[0004] On the one hand, an embodiment of the present invention provides an abnormal sound testing device for a product with a rotating shaft, which is suitable for testing a target product component, and includes: A vibration transmission component, having a first side and a second side distributed in a longitudinal direction, wherein a test position is provided on the first side of the vibration transmission component, a sound wave conduction channel is provided in the test position, and the test position is used to install the target product component; An audio playing component having a sound playing end, the audio playing component is arranged on the second side of the vibration transmission component and is adapted to the test position, a sound wave conduction gap is arranged between the audio playing component and the vibration transmission component, and the sound playing end faces the vibration transmission component; An audio collection component, disposed on the first side of the vibration transmission component, and used for collecting sound signals; A control component is electrically connected to the audio playback component and the audio collection component, respectively. The control component is used to send a sweep frequency signal with a frequency of a preset frequency band that changes over time to the audio playback component, collect sound signals through the audio collection component, and determine whether the target product component produces abnormal sound based on the sound signals.

[0005] According to some embodiments of the present invention, the test position of the vibration transmission component is provided with a mounting portion adapted to the target product component, and the target product component is snap-fittedly connected to the mounting portion.

[0006] According to some embodiments of the present invention, the vibration transfer assembly uses a vibration transfer plate, and the vibration transfer plate is arranged horizontally.

[0007] According to some embodiments of the present invention, the control component includes an audio analysis module, which includes multiple abnormal sound analysis units, a frequency domain conversion unit and an abnormal sound determination unit. The frequency domain conversion unit is used to convert the sound signal into the frequency domain to obtain a spectrum curve; the multiple abnormal sound analysis units are used to analyze the sound signal from multiple dimensions to obtain multiple analysis results, and the abnormal sound determination unit is used to determine whether the target product component has abnormal sound based on the multiple analysis results.

[0008] According to some embodiments of the present invention, the multiple abnormal sound analysis units include multiple ones of a HOHD analysis unit, a TD analysis unit, a THD analysis unit, a FR analysis unit and a TE analysis unit. The HOHD analysis unit is used to perform a high-order harmonic distortion analysis on the spectrum curve to obtain a first analysis result, the TD analysis unit is used to perform a total distortion analysis on the spectrum curve to obtain a second analysis result, the THD analysis unit is used to perform a total harmonic distortion analysis on the spectrum curve to obtain a third analysis result, the FR analysis unit is used to perform a frequency response analysis on the spectrum curve to obtain a fourth analysis result, and the TE analysis unit is used to perform a total harmonic energy distortion analysis on the spectrum curve to obtain a fifth analysis result.

[0009] According to some embodiments of the present invention, the control component further includes a main control module, and an audio sending module and an audio sampling module respectively connected to the main control module.

[0010] On the other hand, an embodiment of the present invention provides a method for testing abnormal sound of a product with a rotating shaft, which is applied to the abnormal sound testing device for the product with a rotating shaft, comprising: Installing the target product component at the test position of the vibration transmission component; The control component sends a sweep frequency signal of a preset frequency band to the audio playback component, so that the audio playback component transmits the energy fluctuation generated by the playing sound to the target product component through the vibration transmission component and the sound wave conduction channel; The control component collects sound signals through the audio collection component; The control component analyzes the sound signal to determine whether the target product component generates abnormal sound according to the sound signal.

[0011] According to some embodiments of the present invention, the control component sends a sweep frequency signal of a preset frequency band to the audio playback component, including: The control component sends a continuous frequency sweep signal with a frequency range of 30-2000 Hz and a change interval of 1 / 12 octave to the audio playback component.

[0012] According to some embodiments of the present invention, the control component analyzes the sound signal to determine whether the target product component generates abnormal sound according to the sound signal, including: The control component performs frequency domain transformation on the sound signal to obtain a frequency spectrum curve; The control component performs multiple analysis of HOHD analysis, TD analysis, THD analysis, FR analysis and TE analysis on the spectrum curve to obtain multiple analysis results; The control component determines whether the target product component generates abnormal sound according to the multiple analysis results.

[0013] According to some embodiments of the present invention, the control component determines whether the target product component generates abnormal sound according to the multiple analysis results, including: When any one of the plurality of analysis results exceeds the corresponding abnormal sound threshold, it is determined that the target product component generates an abnormal sound.

[0014] The embodiments of the present invention have at least the following beneficial effects: The energy fluctuations generated by the sound played by the audio playback component are transmitted to the target product component through the vibration transmission component. If the target product component is poorly assembled, the energy fluctuations will cause the target product component to resonate, thereby making the target product component emit abnormal sounds. By collecting the sound signal through the audio acquisition component and analyzing the sound signal, it can be determined whether the target product component produces abnormal sounds, and then whether the target product component has a problem of poor assembly. The detection efficiency is high and the detection is accurate.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 It is a structural schematic diagram of an abnormal sound testing device for a product with a rotating shaft according to an embodiment of the present invention; Figure 2 It is a principle block diagram of a control component of a device for testing abnormal noise of a product with a rotating shaft according to an embodiment of the present invention; Figure 3It is a principle block diagram of an audio analysis module of an abnormal sound testing device for a product with a rotating shaft according to an embodiment of the present invention; Figure 4 A flowchart of the steps of a method for testing abnormal noise of a product with a rotating shaft according to an embodiment of the present invention; Figure 5 HOHD analysis curve diagram of good and bad components of an embodiment of the present invention; Figure 6 TD analysis curve diagram of good and defective components of an embodiment of the present invention; Figure 7 is a THD analysis curve diagram of a good component and a defective component according to an embodiment of the present invention; Figure 8 FR analysis curve diagram of good and bad components of an embodiment of the present invention; Fig. 9 TE analysis curve diagram of good and defective components according to an embodiment of the present invention.

[0017] Reference numerals: Target product component 10, end cover 11, rotating shaft 12, vibration transmission component 100, sound wave conduction channel 101, audio playback component 200, audio acquisition component 300, main control module 410, audio sending module 420, audio sampling module 430, audio analysis module 440, frequency domain conversion unit 441, HOHD analysis unit 442, TD analysis unit 443, THD analysis unit 444, FR analysis unit 445, TE analysis unit 446, abnormal sound determination unit 447. DETAILED DESCRIPTION

[0018] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0019] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] In the description of the present invention, "several" means one or more, "multiple" means more than two, greater than, less than, and exceeding are understood as not including the number itself, and "above", "below", and "within" are understood as including the number itself. If there is a description of "first", "second", etc., it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0021] In the description of the present invention, unless otherwise clearly defined, words such as “setting”, “installation” and “connection” should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0022] Terminology Note: HOHD: High Order Harmonic Distortion, high-order harmonic distortion; TD: Total Distortion, total distortion; THD: Total Harmonic Distortion, total harmonic distortion; FR:Frequency Response,frequency response; TE: Total Energy, total harmonic energy distortion; Rub & Buzz: Rub and buzz.

[0023] Please refer to Figure 1 The present embodiment discloses an abnormal sound testing device for products with a rotating shaft, which is suitable for testing a target product component 10. The abnormal sound testing device for products with a rotating shaft includes a vibration transmission component 100, an audio playback component 200, an audio collection component 300, and a control component. The vibration transmission component 100 has a first side and a second side (such as an upper side and a lower side) distributed along the longitudinal direction. The first side of the vibration transmission component 100 is provided with a test position, and a sound wave conduction channel 101 is provided in the test position. The test position is used to install the target product component 10, and the target product component 10 covers the sound wave conduction channel 101. The audio playback component 200 has a sound playback end. The audio playback component 200 is provided on the second side of the vibration transmission component 100 and is adapted to the test position. A sound wave conduction gap (such as Figure 1The audio player component 200 is provided with a sound playing end facing the vibration transmission component 100, and the audio collection component 300 is provided on a first side of the vibration transmission component 100. The audio collection component 300 is used to collect sound signals. The control component is electrically connected to the audio player component 200 and the audio collection component 300 respectively. The control component is used to send a frequency sweep signal of a preset frequency band (i.e., a certain frequency range) that changes with time to the audio player component 200, collect sound signals through the audio collection component 300, and determine whether the target product component 10 generates abnormal sound according to the sound signals.

[0024] The target product assembly 10 of this embodiment includes an end cap 11 and a rotating shaft 12 rotatably mounted on the end cap 11. Of course, other parts may also be mounted on the end cap 11. During the assembly process, the end cap 11, the rotating shaft 12 and other parts need to be assembled. After the assembly is completed, the assembled product assembly (semi-finished product) is subjected to assembly quality inspection to prevent defective products from flowing into the subsequent process, and to prevent the subsequent process from rework or material waste due to the assembly of defective products.

[0025] The target product component 10 has the characteristics of small size and light weight. By properly configuring the sound playback power of the audio playback component 200, the energy fluctuations generated by the sound can be transmitted to the target product component 10 through the vibration transmission component 100. The installation position of the audio collection component 300 can be set according to the actual application scenario. For example, the abnormal sound test equipment for products with rotating shafts also includes an equipment shell, and a sound insulation cavity (such as Figure 1 As shown by mark Z in the figure), the soundproof cavity can reduce the interference of environmental noise on the test, the test position is set in the soundproof cavity, the audio collection component 300 has an audio collection end, for example, the audio collection component 300 adopts a microphone, in some application examples, the audio collection component 300 is installed in the soundproof cavity, and the audio collection end of the audio collection component 300 is facing the test position where the target product component 10 is located; or, in other application examples, the audio collection component 300 is embedded in the device housing, and the audio collection end of the audio collection component 300 extends to the soundproof cavity and faces the test position where the target product component 10 is located.

[0026] The audio player component 200 and the test position are distributed on opposite sides of the vibration transmission component 100, and the position of the audio player component 200 is adapted to the test position, for example, the audio player component 200 is located directly below the test position. The vibration transmission component 100 can play a bearing role for the target product component 10, and a sound wave conduction gap is set between the audio player component 200 and the vibration transmission component 100. The energy fluctuation generated by the audio player component 200 playing the sound is transmitted to the vibration transmission component 100 through the air, and the vibration transmission component 100 transmits the energy fluctuation to the target product component 10 in a solid conduction manner. The vibration transmission component 100 is provided with a sound wave conduction channel 101, and the energy fluctuation can also be transmitted to the target product component 10 through the sound wave conduction channel 101, thereby causing the resonance of the target product component 10 under the action of the sound wave energy of some frequencies. Among them, the size of the sound wave conduction channel 101 can be adaptively adjusted according to the actual application effect.

[0027] The test position of the vibration transmission component 100 is provided with a mounting portion adapted to the target product component 10, and the target product component 10 is snap-fitted and connected to the mounting portion. The mounting portion can be a contoured positioning structure provided on the vibration transmission component 100 and adapted to the target product component 10. For example, the target product component 10 includes an end cap 11 and parts mounted on the end cap 11. The bottom of the end cap 11 is connected to the vibration component. The structure of the mounting portion is adapted to the structure of the end cap 11 to position and fix the end cap 11.

[0028] The vibration transmission component 100 uses a vibration transmission plate, which is arranged horizontally and can be used to carry the target product component 10. It is worth mentioning that the target product component 10 has the characteristics of small size and light weight. Therefore, the vibration transmission plate can carry the target product component 10 and can also transmit the energy fluctuation of sound to the target product component 10. The vibration transmission plate has a simple structure and is easy to assemble and use.

[0029] It should be noted that the purpose of the test in this embodiment is to detect whether the target product component 10 is poorly assembled when the target product component 10 is in a semi-finished state. The relevant technology usually places the finished product of the target product in a running state and performs detection by artificial listening after the target product (the product corresponding to the target product component 10) is assembled into a finished product. This method mainly achieves the purpose of detection by simulating the actual working conditions of the target product. At present, there are few detection methods for the target product component 10 in a semi-finished state, and it is not possible to perform detection accurately and effectively.

[0030] The energy fluctuations generated by the sound played by the audio playback component 200 of this embodiment are transmitted to the target product component 10 through the vibration transmission component 100 and the sound wave conduction channel 101. If the target product component 10 is poorly assembled, the energy fluctuations will cause the target product component 10 to resonate, thereby causing the target product component 10 to emit abnormal sounds. By collecting the sound signal through the audio acquisition component 300 and analyzing the sound signal, it can be determined whether the target product component 10 generates abnormal sounds, and then determine whether the target product component 10 has a problem of poor assembly. The detection efficiency is high and the detection is accurate.

[0031] During the test, the sound played by the audio playback component 200 is a continuous signal whose frequency varies with time and whose frequency is known to the user. For example, the frequency sweep signal adopts a pure tone signal with a frequency variation. The sound played by the audio playback component 200 can be transmitted through the vibration transmission component 100 or through air vibration transmission, so as to be collected by the audio collection component 300. If the target product component 10 has a problem of poor assembly of parts, then under a sound signal of a certain frequency, the energy fluctuation of the sound signal will cause the target product component 10 to resonate and emit Rub & Buzz abnormal sound, that is, the sound signal collected by the audio collection component 300 will be doped with the signal component of Rub & Buzz abnormal sound. By analyzing the collected sound signal and determining whether the sound signal has an abnormal sound component, it can be determined whether the target product component 10 has a problem of poor assembly. In this way, the abstract problem of poor assembly of parts can be converted into a more familiar audio analysis problem, which is conducive to reducing the difficulty of detection and facilitating the provision of quantifiable detection indicators.

[0032] It is worth mentioning that the target product component 10 has the characteristics of small size and light weight. In view of this feature, the present embodiment adopts the audio player component 200 as the resonance source of the target product component 10, which also has the advantage of small size, and the peripheral structure of the audio player component 200 is simple, and does not require large and complex equipment to drive, which is conducive to the miniaturization design of the abnormal sound test equipment with a rotating shaft product. In addition, the sound signal played by the audio player component 200 has a wide frequency range, such as the frequency range that the human ear can hear (20Hz~20KHz). The frequency range of the audio player component 200 is much wider than that of the mechanical vibration source (the vibration frequency is usually at the level of ten hertz or one hundred hertz, which cannot meet the test requirements), which can meet the test requirements; in addition, the audio player component 200 plays sound and almost no noise signal is generated, which can reduce the interference factors of the test; in addition, the size of the mechanical vibration source cannot meet the test requirements of the target product component 10; during the test, the vibration frequency of the mechanical vibration source is usually fixed (that is, it cannot change with time), which cannot be used to detect the resonance frequency of the target product component 10.

[0033] Please refer to Figure 2 and Figure 3 In order to accurately analyze whether there are abnormal sound components in the sound signal, the control component includes an audio analysis module 440, which includes multiple abnormal sound analysis units, a frequency domain conversion unit 441 and an abnormal sound determination unit 447. The frequency domain conversion unit 441 is used to convert the sound signal into the frequency domain to obtain a spectrum curve; the multiple abnormal sound analysis units are used to analyze the sound signal from multiple dimensions to obtain multiple analysis results, and the abnormal sound determination unit 447 is used to determine whether there is an abnormal sound in the target product component 10 according to the multiple analysis results. The collected sound signal is a time domain signal that changes with time. The time domain signal is not convenient for analyzing the signal components of each frequency. For this reason, the sound signal is converted from the time domain to the frequency domain by the frequency domain conversion unit 441 to obtain a frequency curve, which is convenient for subsequent signal analysis. This embodiment implements multi-dimensional analysis by configuring multiple abnormal sound analysis units, and can accurately and effectively determine whether there are abnormal sound components in the sound signal.

[0034] Please refer to Figure 3 The plurality of abnormal sound analysis units include a plurality of HOHD analysis units 442, TD analysis units 443, THD analysis units 444, FR analysis units 445, and TE analysis units 446. The HOHD analysis unit 442 is used to perform a high-order harmonic distortion analysis on the spectrum curve to obtain a first analysis result, the TD analysis unit 443 is used to perform a total distortion analysis on the spectrum curve to obtain a second analysis result, the THD analysis unit 444 is used to perform a total harmonic distortion analysis on the spectrum curve to obtain a third analysis result, the FR analysis unit 445 is used to perform a frequency response analysis on the spectrum curve to obtain a fourth analysis result, and the TE analysis unit 446 is used to perform a total harmonic energy distortion analysis on the spectrum curve to obtain a fifth analysis result. The abnormal sound determination unit 447 is used to determine whether the target product component 10 has an abnormal sound according to a plurality of the first analysis result, the second analysis result, the third analysis result, the fourth analysis result, and the fifth analysis result.

[0035] Please refer to Figure 2, the control component also includes a main control module 410 and an audio sending module 420 and an audio sampling module 430 respectively connected to the main control module 410. Exemplarily, the control component can adopt an electronic computer, the main control module 410 can be a mainboard in the electronic computer, and the audio sending module 420 and the audio sampling module 430 can be modules integrated in the sound card. The audio analysis module 440 can be a software application in the electronic computer, or the audio analysis module 440 can be an integrated hardware circuit module. The main control module 410 is used to coordinate the audio sending module 420 and the audio sampling module 430, the audio sending module 420 is used to send the sweep signal to the audio playback component 200, and the audio sampling module 430 is used to receive the sound signal from the audio acquisition component 300 and send the sound signal to the audio analysis module 440.

[0036] Please refer to Figure 4 This embodiment provides a method for testing abnormal sound of a product with a rotating shaft, which is applied to the abnormal sound testing device for the product with a rotating shaft, and includes steps S100 to S400. It should be noted that the numbering of the steps in this embodiment is only for the convenience of review and understanding, and does not limit the execution order of the steps. Please refer to Figure 1 , the following is a detailed description of each step: S100, installing the target product component 10 at the test position of the vibration transmission component 100; Exemplarily, the target product component 10 can be an assembly structure of the end cover 11 and the rotating shaft 12, or an assembly structure of the end cover 11 and the parts on the end cover 11. The structure of the test position of the vibration transmission component 100 is adapted to the structure of the target product component 10. The target product component 10 is a structure in a semi-finished state. The assembly quality inspection is performed in the semi-finished state to detect poorly assembled product components in time, prevent poorly assembled product components from flowing into the next process, and prevent rework or material waste due to assembly of defective products in the later process, which is conducive to controlling production costs.

[0037] S200, the control component sends a sweep frequency signal of a preset frequency band to the audio playing component 200, so that the audio playing component 200 transmits the energy fluctuation generated by the playing sound to the target product component 10 through the vibration transmission component 100 and the sound wave conduction channel 101; Exemplarily, the target product component 10 of this embodiment has the characteristics of small size and light weight. By reasonably configuring the audio playback power of the audio playback component 200 and selecting a vibration transmission component 100 with a suitable thickness, the energy fluctuations generated by the audio playback component 200 playing the sound can be transmitted to the target product component 10 through the vibration transmission component 100 in the form of solid conduction and air conduction, thereby causing the resonance of the target product component 10 under certain frequency energy fluctuations. Resonance refers to the phenomenon that the amplitude of a mechanical system (such as the target product component 10) is significantly increased when the frequency of the excitation (such as the energy fluctuations generated by playing the sound) is close to a certain order of the natural frequency of the system. Among them, the control component sends a continuous sweep signal with a frequency range of 30~2000Hz and a change interval of 1 / 12 octave to the audio playback component 200. Before the test, it is unknown whether there is an assembly problem with the target product component 10 and at what frequency the abnormal sound produced by the target product component 10 is manifested. Therefore, it is necessary to send a sweeping signal with a wider frequency range to the target product component 10. The frequency change interval of the sweeping signal is 1 / 12 octave, which can make the frequency precision of the sweeping signal higher and meet the detection requirements. It should be noted that during the initial detection, the frequency band of the sweeping signal can be configured to a wider range. After preliminarily determining the frequency band of the abnormal sound signal of the target product component 10, the frequency band of the sweeping signal can be configured to a narrower range, such as 100~600Hz, so as to perform more accurate detection and analysis.

[0038] S300, the control component collects sound signals through the audio collection component 300; Exemplarily, in order to reduce the interference of environmental noise, the target product component 10 is usually enclosed in a relatively quiet environment (such as a soundproof room or a soundproof chamber) for testing. In theory, for good components, the sound signal collected by the audio acquisition component 300 includes the sound signal played by the audio playback component 200, while for defective components, the sound signal collected by the audio acquisition component 300 includes both the sound signal played by the audio playback component 200 and the abnormal sound signal generated by the resonance of the target product component 10.

[0039] S400, the control component analyzes the sound signal to determine whether the target product component 10 generates abnormal sound according to the sound signal.

[0040] The energy fluctuation generated by the sound played by the audio playback component 200 of this embodiment is transmitted to the target product component 10 through the vibration transmission component 100. If the target product component 10 is poorly assembled, the energy fluctuation will cause the target product component 10 to resonate, thereby making the target product component 10 emit an abnormal sound. By collecting the sound signal through the audio acquisition component 300 and analyzing the sound signal, it can be determined whether the target product component 10 produces an abnormal sound, and then determine whether the target product component 10 has a problem of poor assembly. The detection efficiency is high and the detection is accurate.

[0041] Step S400: the control component analyzes the sound signal to determine whether the target product component 10 generates abnormal sound according to the sound signal, including: S410, the control component performs frequency domain transformation on the sound signal to obtain a frequency spectrum curve; S420, the control component performs multiple analysis of HOHD analysis, TD analysis, THD analysis, FR analysis and TE analysis on the spectrum curve to obtain multiple analysis results; S430. The control component determines whether the target product component 10 generates abnormal sound according to the multiple analysis results.

[0042] Exemplarily, the sound signal is a time domain signal that changes with time. The control component converts the sound signal from the time domain to the frequency domain through Fourier transform to obtain a spectrum curve for subsequent spectrum analysis. Among them, the abnormal sound generated by the target product component 10 of this embodiment is similar to the Rub & Buzz abnormal sound test in the acoustic test. Therefore, by performing multi-dimensional analysis of the spectrum curve through HOHD analysis, TD analysis, THD analysis, FR analysis and TE analysis, it is possible to more accurately analyze whether the target product component 10 has abnormal sound.

[0043] Step S430 includes: when any one of the plurality of analysis results exceeds the corresponding abnormal sound threshold, determining that the target product component 10 generates an abnormal sound.

[0044] For example, Figures 5 to 9 The graphs of good and bad components under different analyses are shown. The curve marked L1 in the figure represents the curve of a good motor, and the curve marked L2 represents the curve of a bad component. The unit of the horizontal axis is Hz (Hertz). Figure 5 The graph of HOHD analysis is shown, and the unit of the ordinate is percentage. The curves of good and defective components are significantly different at the position indicated by the mark P in the graph. Therefore, by reasonably setting the HOHD abnormal sound threshold (as indicated by the mark L3 in the graph), it is possible to detect whether the target product component 10 has abnormal sound. Figure 6 Shown is the curve of TD analysis, the unit of the ordinate is 1; Figure 7Shown is a graph of THD analysis, with the unit of the ordinate being percentage; Figure 8 Shown is a graph of FR analysis, with the unit of the ordinate being dB; Fig. 9 The graph shown is a TE analysis graph, and the unit of the ordinate is 1. Figures 6 to 9 It can be seen that good and defective components do not show much difference in TD, THD, FR and TE dimensions. Therefore, multi-dimensional analysis of the spectrum curve is conducive to improving the accuracy of detection. For example, when any of the multiple analysis results obtained by HOHD analysis, TD analysis, THD analysis, FR analysis and TE analysis exceeds the corresponding abnormal sound threshold, it can be determined that the target product component 10 produces abnormal sound, and then it can be determined that the target product component 10 has a poor assembly problem.

[0045] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A noise testing device for a product with a rotating shaft, suitable for testing a target product component (10), characterized in that: include: A vibration transmission component (100) having a first side and a second side distributed in a longitudinal direction, wherein the first side of the vibration transmission component (100) is provided with a test position, wherein a sound wave conduction channel (101) is provided in the test position, and the test position is used to install the target product component (10); An audio playback component (200) having a sound playback end, the audio playback component (200) being arranged on the second side of the vibration transmission component (100) and adapted to the test position, a sound wave conduction gap being arranged between the audio playback component (200) and the vibration transmission component (100), and the sound playback end facing the vibration transmission component (100); An audio collection component (300) is arranged on the first side of the vibration transmission component (100), and the audio collection component (300) is used to collect sound signals; A control component is electrically connected to the audio playback component (200) and the audio collection component (300), respectively, and is used to send a sweep frequency signal of a preset frequency band whose frequency varies with time to the audio playback component (200), collect sound signals through the audio collection component (300), and determine whether the target product component (10) generates abnormal sound based on the sound signals.

2. The abnormal sound testing equipment for products with rotating shafts according to claim 1, characterized in that: The test position of the vibration transmission component (100) is provided with a mounting portion adapted to the target product component (10), and the target product component (10) is buckled and connected to the mounting portion.

3. The abnormal sound testing device for products with rotating shafts according to claim 1 or 2, characterized in that: The vibration transmission component (100) adopts a vibration transmission plate, and the vibration transmission plate is arranged in a transverse direction.

4. The abnormal sound testing equipment for products with rotating shafts according to claim 1, characterized in that: The control component comprises an audio analysis module (440), the audio analysis module (440) comprising a plurality of abnormal sound analysis units, a frequency domain conversion unit (441) and an abnormal sound determination unit (447), the frequency domain conversion unit (441) being used to perform frequency domain conversion on the sound signal to obtain a frequency spectrum curve; the plurality of abnormal sound analysis units being used to analyze the sound signal from multiple dimensions to obtain a plurality of analysis results, and the abnormal sound determination unit (447) being used to determine whether the target product component (10) has an abnormal sound based on the plurality of analysis results.

5. The abnormal sound testing device for products with rotating shafts according to claim 4, characterized in that: The multiple abnormal sound analysis units include multiple ones of a HOHD analysis unit (442), a TD analysis unit (443), a THD analysis unit (444), a FR analysis unit (445) and a TE analysis unit (446); the HOHD analysis unit (442) is used to perform a high-order harmonic distortion analysis on the frequency spectrum curve to obtain a first analysis result; the TD analysis unit (443) is used to perform a total distortion analysis on the frequency spectrum curve to obtain a second analysis result; the THD analysis unit (444) is used to perform a total harmonic distortion analysis on the frequency spectrum curve to obtain a third analysis result; the FR analysis unit (445) is used to perform a frequency response analysis on the frequency spectrum curve to obtain a fourth analysis result; and the TE analysis unit (446) is used to perform a total harmonic energy distortion analysis on the frequency spectrum curve to obtain a fifth analysis result.

6. The abnormal sound testing device for products with rotating shafts according to claim 4 or 5, characterized in that: The control component further comprises a main control module (410), and an audio sending module (420) and an audio sampling module (430) respectively connected to the main control module (410).

7. A method for testing abnormal sound of a product with a rotating shaft, applied to the abnormal sound testing device for a product with a rotating shaft as claimed in any one of claims 1 to 6, characterized in that: include: Installing a target product component (10) at a test position of the vibration transmission component (100); The control component sends a sweep frequency signal of a preset frequency band to the audio playback component (200), so that the audio playback component (200) transmits the energy fluctuation generated by the playback sound to the target product component (10) through the vibration transmission component (100) and the sound wave conduction channel (101); The control component collects sound signals through the audio collection component (300); The control component analyzes the sound signal to determine whether the target product component (10) generates abnormal sound based on the sound signal.

8. The abnormal sound testing method for a product with a rotating shaft according to claim 7, characterized in that: The control component sends a sweep frequency signal of a preset frequency band to the audio playback component (200), comprising: The control component sends a continuous frequency sweep signal with a frequency range of 30-2000 Hz and a variation interval of 1 / 12 octave to the audio playback component (200).

9. The abnormal sound testing method for a product with a rotating shaft according to claim 7 or 8, characterized in that: The control component analyzes the sound signal to determine whether the target product component (10) generates abnormal sound according to the sound signal, including: The control component performs frequency domain transformation on the sound signal to obtain a frequency spectrum curve; The control component performs multiple analysis of HOHD analysis, TD analysis, THD analysis, FR analysis and TE analysis on the spectrum curve to obtain multiple analysis results; The control component determines whether the target product component (10) generates abnormal sound based on the multiple analysis results.

10. The abnormal sound testing method for a product with a rotating shaft according to claim 9, characterized in that: The control component determines whether the target product component (10) generates abnormal sound according to the multiple analysis results, including: When any one of the plurality of analysis results exceeds the corresponding abnormal sound threshold, it is determined that the target product component (10) produces an abnormal sound.

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