A test method and system for anti-resonance products
By obtaining the resonant frequency of the test fixture and inputting an intervention vibration with opposite phase, the problem of test result distortion caused by the resonance of the test fixture is solved, achieving higher test reliability and accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GEER TECH CO LTD
- Filing Date
- 2024-01-26
- Publication Date
- 2026-07-17
AI Technical Summary
During product quality testing, testing fixtures are prone to entering a resonance state, leading to distorted test results and decreased accuracy.
By acquiring the resonant frequency of the test fixture and monitoring its vibration frequency during the test, when the resonant frequency is reached, an intervention vibration with the same frequency but opposite phase is input to counteract the vibration of the test fixture and prevent the occurrence of resonance.
It effectively prevents the test fixture from entering a resonance state, thereby improving the reliability and accuracy of test results.
Smart Images
Figure CN117939382B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of vibration technology, and in particular to a method for testing products to prevent resonance. This invention also relates to a system for testing products to prevent resonance. Background Technology
[0002] Currently, electronic products such as headphones and mobile phones are required to undergo product quality testing before leaving the factory. Typical product quality tests usually include at least acoustic testing and motion testing.
[0003] Acoustic testing primarily assesses the sound quality of electronic products such as headphones or mobile phones, including parameters like frequency, decibels, timbre, and distortion. Specifically, the product under test is placed on an acoustic testing fixture, and then plays a preset audio track. The test results are determined based on the actual playback effect. Motion testing primarily assesses the operational stability of attitude sensors such as gyroscopes and inertial motion units within electronic products like headphones or mobile phones under motion interference environments. Specifically, the product under test is mounted on a motion testing fixture, and then a drive motor on the fixture rotates the product at high speed. The test results are determined based on the actual detection data from the attitude sensors such as the gyroscope and inertial motion unit.
[0004] However, when the product under test (DUT) is tested on acoustic or motion testing fixtures, the sound emitted by the DUT or the high-speed movement of the drive motor will inevitably cause vibration to the testing fixture itself. In most cases, the vibration affecting the testing fixture is relatively small and its impact on the product quality test results is negligible. However, during the test, when the DUT emits a sound at a specific frequency or the drive motor reaches a certain speed range, the testing fixture may enter a resonance state. The amplitude of the testing fixture in a resonance state is large, which will have a significant impact on the product quality test results, leading to distortion and decreased accuracy of the test results.
[0005] Therefore, how to prevent the test fixture from entering a resonance state during the test process, avoid adverse effects on the test results, and improve the reliability and accuracy of the test results is a technical problem faced by those skilled in the art. Summary of the Invention
[0006] The purpose of this invention is to provide an anti-resonance product testing method that prevents the testing fixture from entering a resonant state during the testing process, avoiding adverse effects on the test results and improving the reliability and accuracy of the test results. Another purpose of this invention is to provide an anti-resonance product testing system.
[0007] To solve the above-mentioned technical problems, the present invention provides a method for testing anti-resonance products, comprising:
[0008] Obtain the resonant frequency of the test fixture;
[0009] The product under test is tested using the test fixture according to the preset test procedure, and the vibration frequency of the test fixture is monitored during the test.
[0010] When the vibration frequency of the test fixture reaches its resonant frequency, an intervention vibration is input to the test fixture; wherein the vibration frequency of the intervention vibration is the same as the resonant frequency of the test fixture, and the phase of the intervention vibration is opposite to the vibration phase of the test fixture.
[0011] In some specific embodiments, obtaining the resonant frequency of the test fixture specifically includes:
[0012] Install the vibration pickup and vibration source on the acoustic testing fixture;
[0013] The acoustic testing fixture is subjected to vibrations of different frequencies by the vibration source device, and the vibration state of the acoustic testing fixture is monitored by the vibration pickup device. When the amplitude of the acoustic testing fixture changes abruptly, the current vibration frequency is recorded as the resonance frequency.
[0014] In some specific embodiments, obtaining the resonant frequency of the test fixture specifically includes:
[0015] A microphone and a speaker are installed on the acoustic testing fixture;
[0016] The speaker plays audio at different frequencies, while the microphone receives sound signals. The sound signals received by the microphone are compared with the audio signals played by the speaker in real time, and the sound frequency at which the sound signal deviates abruptly from the audio signal is taken as the resonant frequency.
[0017] In some specific embodiments, obtaining the resonant frequency of the test fixture specifically includes:
[0018] Install vibration pickups on the motion testing fixture;
[0019] The power component of the motion test fixture is activated, and the vibration state of the motion test fixture is monitored by the vibration pickup. When the amplitude of the motion test fixture changes abruptly, the current vibration frequency is recorded as the resonance frequency.
[0020] In some specific embodiments, obtaining the resonant frequency of the test fixture specifically includes:
[0021] An accelerometer is installed on the motion testing fixture;
[0022] The drive motor of the motion test fixture is started, and the acceleration of the motion test fixture is monitored by the accelerometer. When the acceleration of the motion test fixture changes abruptly, the current vibration frequency of the motion test fixture is calculated, and the calculation result is the resonance frequency.
[0023] In some specific embodiments, monitoring the vibration frequency of the test fixture during the test specifically includes:
[0024] The vibration state of the test fixture is monitored during the test by a vibration pickup installed on the test fixture, and the vibration frequency of the test fixture is obtained in real time.
[0025] The specific methods for intervening in vibration input to the test fixture include:
[0026] Intervention vibration is input to the test fixture by an exciter installed on the test fixture.
[0027] In some specific embodiments, after obtaining the resonant frequency of the test fixture, and before testing the product under test, the method further includes:
[0028] The test fixture is brought into a resonant state;
[0029] A verification vibration is input to the test fixture by an exciter installed on the test fixture; wherein the vibration frequency of the verification vibration is the same as the obtained resonance frequency, and the phase of the verification vibration is opposite to the resonance phase of the test fixture.
[0030] The vibration state of the test fixture is detected by a vibration pickup installed on the test fixture, and the frequency of the verification vibration input to the test fixture is corrected accordingly until the vibration state of the test fixture tends to be still. Then the frequency of the current verification vibration is output as the resonance frequency.
[0031] The present invention also provides an anti-resonance product testing system, comprising:
[0032] The frequency acquisition module is used to acquire the resonant frequency of the test fixture;
[0033] The test monitoring module is used to test the product under test through the test fixture according to the preset test procedure, and to monitor the vibration frequency of the test fixture during the test.
[0034] The resonance intervention module is used to input intervention vibration to the test fixture when the vibration frequency of the test fixture reaches its resonance frequency; wherein the vibration frequency of the intervention vibration is the same as the resonance frequency of the test fixture, and the phase of the intervention vibration is opposite to the resonance phase of the test fixture.
[0035] In some specific embodiments, the testing fixture is an acoustic testing fixture;
[0036] The frequency acquisition module includes:
[0037] A vibration source is used to input vibrations of different frequencies into the acoustic testing fixture;
[0038] A vibration pickup is used to monitor the vibration state of the acoustic testing fixture and record the current vibration frequency as the resonant frequency when the amplitude of the acoustic testing fixture changes abruptly.
[0039] In some specific embodiments, the testing fixture is a motion testing fixture;
[0040] The frequency acquisition module includes:
[0041] A vibration pickup is used to monitor the vibration state of the motion test fixture after the power component of the motion test fixture is started, and to record the current vibration frequency as the resonance frequency when the amplitude of the motion test fixture changes abruptly.
[0042] The anti-resonance product testing method provided by this invention mainly includes three steps. The first step primarily involves acquiring the resonant frequency of the test fixture. Generally, different test fixtures have different resonant frequencies. The second step primarily involves testing the product under test using the test fixture with the acquired resonant frequency according to a preset test procedure, and monitoring the vibration frequency of the test fixture during the test to obtain real-time information. Since both acoustic and motion tests will cause vibration to the test fixture during the product testing process, the vibration frequency of the test fixture changes in real-time with the test progress. In the third step, when the vibration frequency of the test fixture reaches its resonant frequency (acquired in the first step) during the test, an intervention vibration is input to the test fixture; the vibration frequency of this intervention vibration is the same as the resonant frequency of the test fixture (acquired in the first step), and the phase of this intervention vibration is opposite to the phase of the vibration of the test fixture. Thus, two vibrational energies or two vibrational waves exist simultaneously on the test fixture. One vibrational wave is formed by the sound emitted by the product under test or the rotational motion of the drive motor, and the other vibrational wave is formed by externally input interference vibration. The two vibrational waves have the same frequency and opposite phase, which can form an interference phenomenon. Moreover, the peaks and troughs of the two vibrational waves superimpose each other to achieve vibration cancellation or neutralization effect, so that the vibration on the test fixture tends to zero, that is, tends to remain in a static state, preventing the test fixture from entering a resonance state, thereby avoiding interference or influence on the testing process of the product under test caused by the test fixture.
[0043] In summary, the anti-resonance product testing method provided by this invention can prevent the test fixture from entering a resonance state during the testing process by intervening in the vibration of the test fixture, thereby avoiding adverse effects on the test results and improving the reliability and accuracy of the test results. Attached Figure Description
[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0045] Figure 1 A flowchart illustrating a specific embodiment of the present invention.
[0046] Figure 2 This is a schematic diagram of the structure for testing the product under test using acoustic testing fixtures.
[0047] Figure 3 This is a schematic diagram of the structure used to test the product under test using a motion testing fixture.
[0048] Figure 4 This is a system structure diagram of a specific embodiment of the present invention.
[0049] in, Figure 2 — Figure 4 middle:
[0050] Frequency acquisition module—1, test and monitoring module—2, resonance intervention module—3;
[0051] Acoustic testing fixture—4, motion testing fixture—5;
[0052] Vibration source—6, vibration pickup—7, exciter—8;
[0053] Power components—51. Detailed Implementation
[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0055] Please refer to Figure 1 , Figure 1This is a schematic diagram of the overall structure of a specific embodiment of the present invention.
[0056] In one specific embodiment of the present invention, the anti-resonance product testing method mainly includes three steps:
[0057] S1. Obtain the resonant frequency of the test fixture;
[0058] S2. Test the product under test using the test fixture according to the preset test procedure, and monitor the vibration frequency of the test fixture during the test.
[0059] S3. When the vibration frequency of the test fixture reaches its resonant frequency, an intervention vibration is input to the test fixture; wherein the vibration frequency of the intervention vibration is the same as the resonant frequency of the test fixture, and the phase of the intervention vibration is opposite to the vibration phase of the test fixture.
[0060] In step S1, the main task is to obtain the resonant frequency of the test fixture. Generally, different test fixtures have different resonant frequencies. For example, the resonant frequency of the acoustic test fixture 4 is usually different from that of the motion test fixture 5.
[0061] In step S2, the main content involves testing the product under test using a test fixture with the resonant frequency already obtained, following a preset test procedure. During the test, the vibration frequency of the test fixture is monitored to obtain real-time information about its vibration frequency. Since both acoustic and motion tests will cause vibration to the test fixture during the product testing process, the vibration frequency of the test fixture changes in real-time following the test progress.
[0062] In step S3, when the vibration frequency of the test fixture is detected to reach its resonant frequency (obtained in the first step) during the test, an intervention vibration is input to the test fixture; the vibration frequency of the intervention vibration is the same as the resonant frequency of the test fixture (obtained in the first step), and the phase of the intervention vibration is opposite to the vibration phase of the test fixture.
[0063] Thus, two vibrational energies or two vibrational waves exist simultaneously on the test fixture. One vibrational wave is formed by the sound emitted by the product under test or the rotational motion of the drive motor, and the other vibrational wave is formed by externally input interference vibration. The two vibrational waves have the same frequency and opposite phase, which can form an interference phenomenon. Moreover, the peaks and troughs of the two vibrational waves superimpose each other to achieve vibration cancellation or neutralization effect, so that the vibration on the test fixture tends to zero, that is, tends to remain in a static state, preventing the test fixture from entering a resonance state, thereby avoiding interference or influence on the testing process of the product under test caused by the test fixture.
[0064] In summary, the anti-resonance product testing method provided in this embodiment can prevent the test fixture from entering a resonance state during the testing process by intervening in the vibration of the test fixture, thereby avoiding adverse effects on the test results and improving the reliability and accuracy of the test results.
[0065] Considering that the vibration source of the acoustic testing fixture 4 is mainly the sound emitted by the product under test, while the vibration source of the motion testing fixture 5 is mainly the rotational motion of the drive motor installed on the motion testing fixture 5, it can be seen that the vibration sources of the acoustic testing fixture 4 and the motion testing fixture 5 are different. In this embodiment, the method for obtaining the resonant frequency of the acoustic testing fixture 4 is also different from the method for obtaining the resonant frequency of the motion testing fixture 5.
[0066] like Figure 2 As shown, Figure 2 This is a schematic diagram of the structure for testing the product under test using acoustic testing fixture 4.
[0067] Specifically, in step S1, obtaining the resonant frequency of the acoustic testing fixture 4 includes:
[0068] Install the vibration pickup 7 and the vibration source 6 on the acoustic testing fixture 4;
[0069] The acoustic testing fixture 4 is fed with vibrations of different frequencies by the vibration source 6, and the vibration state of the acoustic testing fixture 4 is monitored by the vibration pickup 7. When the amplitude of the acoustic testing fixture 4 changes abruptly, the current vibration frequency is recorded as the resonance frequency.
[0070] Specifically, the acoustic testing fixture 4 mainly includes components such as a base plate and a support. The base plate is primarily used to mount the product under test; in this embodiment, it also mounts the vibration source 6. The vibration pickup 7 is mounted on the support and connected to the base plate via the support. After both the vibration pickup 7 and the vibration source 6 are installed, the vibration source 6 is first activated to generate vibrations and input vibrations of different frequencies to the base plate of the acoustic testing fixture 4. For example, the frequency of the generated vibrations is gradually increased from small to large according to a certain frequency gradient to ensure that the frequency range of the vibrations generated by the vibration source 6 can completely cover the resonant frequency of the acoustic testing fixture 4. At the same time, after the vibration source 6 is activated, the vibration pickup 7 also enters the working state. The vibration pickup 7 can monitor the vibration state of the acoustic testing fixture 4 in real time, such as detecting parameters such as the vibration frequency, vibration amplitude, and vibration phase of the acoustic testing fixture 4. When the frequency of vibration generated by the vibrator 6 does not reach the resonant frequency of the acoustic testing fixture 4, the impact on the acoustic testing fixture 4 is small, and the vibration amplitude of the acoustic testing fixture 4 is also small. However, when the frequency of vibration generated by the vibrator 6 reaches the resonant frequency of the acoustic testing fixture 4, the impact on the acoustic testing fixture 4 is large, and the vibration amplitude of the acoustic testing fixture 4 is also large. Therefore, according to this logic, when the vibration pickup 7 detects a sudden change in the amplitude of the acoustic testing fixture 4, it indicates that the acoustic testing fixture 4 has resonated. At this time, the current vibration frequency of the acoustic testing fixture 4 is recorded, which is the resonant frequency. Of course, the resonant frequency of the acoustic testing fixture 4 is generally a frequency range, rather than a fixed frequency value.
[0071] Generally, the vibration source 6 can be a component such as an audio speaker, placed on the base plate surface of the acoustic testing fixture 4. The vibration pickup 7 can be a component such as a microphone, clamped and fixed on the bracket of the acoustic testing fixture 4, with the microphone's pickup port facing the audio speaker to ensure sound pickup effect. Specifically, after the audio speaker and microphone are installed, audio of different frequencies can be played through the audio speaker, while the microphone receives the sound signal and compares the sound signal received by the microphone with the audio signal played by the audio speaker in real time. For example, the sound signal received by the microphone can be processed to generate a curve, and then compared with the curve of the audio signal played by the audio speaker, so that the sound frequency at which the sound signal deviates abruptly from the audio signal is taken as the resonant frequency. Of course, the time point at which the sound signal deviates abruptly from the audio signal can also be recorded. If the audio file played by the product under test during the test is the same as the audio file played by the vibration source 6, intervention vibration can be directly input into the acoustic testing fixture 4 within the corresponding time period according to the recorded time point.
[0072] like Figure 3 As shown, Figure 3 This is a schematic diagram of the structure of the motion testing fixture 5 used to test the product under test.
[0073] Specifically, in step S1, obtaining the resonant frequency of the motion testing fixture 5 includes:
[0074] Install the vibration pickup 7 on the motion testing fixture 5;
[0075] The power component 51 of the motion test fixture 5 is started, and the vibration state of the motion test fixture 5 is monitored by the vibration pickup 7. When the amplitude of the motion test fixture 5 changes abruptly, the current vibration frequency is recorded as the resonance frequency.
[0076] Specifically, the motion testing fixture 5 mainly includes a base plate, a support base, a bracket, and a power unit 51. The support base is mounted on the base plate, and the power unit 51 is mounted on the support base. The bracket is rotatably mounted on the support base and connected to the output end of the power unit 51, primarily used for rotational movement driven by the power unit 51. The product under test is mounted on the bracket and rotates synchronously with it. The vibration pickup 7 is mounted on the base plate, directly sensing the vibration state of the base plate. After the vibration pickup 7 is installed, the power unit 51 of the motion testing fixture 5 is first activated. This power unit 51 drives the bracket to rotate, which in turn generates vibration on the base plate through the support base. As the rotational speed of the bracket changes, vibrations of different frequencies are input to the base plate of the motion testing fixture 5. For example, the rotational speed of the bracket is gradually increased according to a certain frequency gradient, thereby gradually increasing the frequency of the generated vibration to ensure that the frequency range of the vibration generated by the power unit 51 can completely cover the resonant frequency of the motion testing fixture 5. Simultaneously, after the power component 51 is activated, the vibration pickup 7 also enters its working state. The vibration pickup 7 can monitor the vibration state of the motion testing fixture 5 in real time, such as detecting parameters like vibration frequency, amplitude, and phase. When the frequency of vibration generated by the power component 51 does not reach the resonant frequency of the motion testing fixture 5, the impact on the fixture is small, and the vibration amplitude is also small. Conversely, when the frequency of vibration generated by the power component 51 reaches the resonant frequency, the impact on the fixture is significant, and the vibration amplitude is also large. Therefore, according to this logic, when the vibration pickup 7 detects a sudden change in the amplitude of the motion testing fixture 5, it indicates that resonance has occurred. The current vibration frequency of the fixture is then recorded as the resonant frequency. Of course, the resonant frequency of the motion testing fixture 5 is generally a frequency range, not a fixed value.
[0077] Generally, the power component 51 can be a drive motor or similar component. The vibration pickup 7 can be an accelerometer or similar component. After the accelerometer is installed, the drive motor can be started to drive the bracket to rotate. At the same time, the acceleration of the motion test fixture 5 is monitored by the accelerometer. When the acceleration of the motion test fixture 5 changes abruptly, the current vibration frequency of the motion test fixture 5 is calculated according to the correspondence between acceleration and vibration frequency. The calculated result is the resonant frequency. Of course, the time point when the acceleration changes abruptly can also be recorded. If the operating condition of the power component 51 is consistent with the operating condition of the power component 51 during the process of obtaining the resonant frequency of the motion test fixture 5 during the entire testing process, then intervention vibration can be directly input into the motion test fixture 5 within the corresponding time period according to the recorded time point.
[0078] In step S2, monitoring the vibration frequency of the test fixture during the test specifically includes:
[0079] The vibration pickup 7 installed on the test fixture monitors the vibration state of the test fixture during the test and obtains the vibration frequency of the test fixture in real time.
[0080] Specifically, the vibration pickup 7 is the same as the vibration pickup 7 in step S1 above, and will not be described again here.
[0081] In step S3, the specific steps of inputting intervention vibration into the test fixture include:
[0082] The vibration is introduced into the test fixture by the exciter 8 installed on the test fixture.
[0083] Specifically, the exciter 8 can be installed on the bottom surface of the base plate of the acoustic testing fixture 4 or the motion testing fixture 5, thereby avoiding the surface of the base plate of the acoustic testing fixture 4 or the motion testing fixture 5 to prevent interference with the installation of the product under test or the vibration source 6. Simultaneously, the exciter 8 is mainly used to generate vibration and transmit it to the testing fixture, such as to the base plate of the acoustic testing fixture 4 or the motion testing fixture 5. The operating state of the exciter 8 is adjustable, capable of generating different frequencies, thereby inputting different frequencies of intervention vibration to the testing fixture.
[0084] In addition, to improve the accuracy of detecting and acquiring the resonant frequency of the test fixture, a verification measure is added in this embodiment. Specifically, between step S1 and step S2, the following is also included:
[0085] Step S1.1: Bring the test fixture into a resonance state;
[0086] Step S1.2: Input the verification vibration to the test fixture through the exciter 8 installed on the test fixture; wherein, the vibration frequency of the verification vibration is the same as the obtained resonance frequency, and the phase of the verification vibration is opposite to the resonance phase of the test fixture.
[0087] Step S1.3: Detect the vibration state of the test fixture by using the vibration pickup 7 installed on the test fixture, and correct the frequency of the verification vibration input to the test fixture accordingly, until the vibration state of the test fixture tends to be still, and output the frequency of the current verification vibration as the resonance frequency.
[0088] In step S1.1, for the acoustic testing fixture 4, vibration can be generated by the vibrator 6 mounted on the base plate of the acoustic testing fixture 4 until the acoustic testing fixture 4 enters a resonance state (the resonance state can be measured by the vibration pickup 7 mounted on the acoustic testing fixture 4). For the motion testing fixture 5, it is only necessary to start the power component 51 on the motion testing fixture 5 until the motion testing fixture 5 enters a resonance state (the resonance state can be measured by the vibration pickup 7 mounted on the motion testing fixture 5).
[0089] In step S1.2, a verification vibration is input to the test fixture via the exciter 8 installed on the test fixture. The vibration frequency of this verification vibration is the resonant frequency of the test fixture obtained in step S1. Of course, the phase of the verification vibration needs to be opposite to the phase of the vibration of the test fixture so that the verification vibration and the vibration of the test fixture can counteract each other.
[0090] In step S1.3, the vibration state of the test fixture is detected by the vibration pickup 7 installed on the test fixture to determine whether the test fixture has exited the resonance state or whether the amplitude has significantly decreased to a normal state after the verification vibration is input. If the amplitude of the test fixture has significantly decreased, it means that the test fixture has exited the resonance state, and the resonance frequency obtained in step S1 is relatively accurate and does not need to be modified. If the amplitude of the test fixture does not change significantly, it means that the resonance frequency obtained in step S1 is not very accurate and needs to be modified. After modifying the resonance frequency, steps S1.1 and S1.2 are repeated until the vibration state of the test fixture tends to be still, and the frequency of the current verification vibration is output as the resonance frequency.
[0091] With this setup, after obtaining the resonant frequency of the test fixture, the obtained resonant frequency value is further checked and corrected to improve the accuracy of the obtained results, thereby ensuring the effectiveness of the intervention vibration input to the test fixture during the test process.
[0092] like Figure 4 As shown, Figure 4 This is a system structure diagram of a specific embodiment of the present invention.
[0093] This embodiment also provides an anti-resonance product testing system, mainly including a frequency acquisition module 1, a test monitoring module 2, and a resonance intervention module 3. The frequency acquisition module 1 is mainly used to acquire the resonant frequency of the test fixture. The test monitoring module 2 is mainly used to test the product under test through the test fixture according to a preset test procedure, and to monitor the vibration frequency of the test fixture during the test. The resonance intervention module 3 is mainly used to input intervention vibration to the test fixture when the vibration frequency of the test fixture reaches its resonant frequency; wherein the vibration frequency of the intervention vibration is the same as the resonant frequency of the test fixture, and the phase of the intervention vibration is opposite to the resonant phase of the test fixture.
[0094] The anti-resonance product testing system provided in this embodiment works on the same principle as the aforementioned anti-resonance product testing method and has the same beneficial effects, which will not be repeated here.
[0095] In one specific embodiment of the frequency acquisition module 1, when the test fixture is specifically an acoustic test fixture 4, the frequency acquisition module 1 mainly includes a vibration source 6 and a vibration pickup 7. The vibration source 6 is mainly used to input vibrations of different frequencies into the acoustic test fixture 4. The vibration pickup 7 is mainly used to monitor the vibration state of the acoustic test fixture 4 and record the current vibration frequency as the resonance frequency when the amplitude of the acoustic test fixture 4 changes abruptly. Specifically, the vibration source 6 and the vibration pickup 7 can be referred to in the section on "acquiring the resonance frequency of the acoustic test fixture 4" in the aforementioned anti-resonance product testing method, and will not be repeated here.
[0096] In another specific embodiment of the frequency acquisition module 1, when the test fixture is specifically a motion test fixture 5, the frequency acquisition module 1 mainly includes a vibration pickup 7. This vibration pickup 7 is mainly used to monitor the vibration state of the motion test fixture 5 after the power component 51 of the motion test fixture 5 is started, and to record the current vibration frequency as the resonant frequency when the amplitude of the motion test fixture 5 changes abruptly. Specifically, the vibration pickup 7 can refer to the vibration pickup 7 in the section on "acquiring the resonant frequency of the motion test fixture 5" in the aforementioned anti-resonance product test method, and will not be repeated here.
[0097] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A method for testing anti-resonance products, characterized in that, include: The resonant frequency of the test fixture is obtained, wherein the test fixture includes an acoustic test fixture. Specifically, obtaining the resonant frequency of the test fixture includes: installing a vibration pickup and a vibration source on the acoustic test fixture; inputting vibrations of different frequencies to the acoustic test fixture through the vibration source; simultaneously monitoring the vibration state of the acoustic test fixture through the vibration pickup; and recording the current vibration frequency as the resonant frequency when the amplitude of the acoustic test fixture changes abruptly. The product under test is tested using the test fixture according to the preset test procedure, and the vibration frequency of the test fixture is monitored during the test. When the vibration frequency of the test fixture reaches its resonant frequency, an intervention vibration is input to the test fixture; wherein the vibration frequency of the intervention vibration is the same as the resonant frequency of the test fixture, and the phase of the intervention vibration is opposite to the resonant phase of the test fixture.
2. The anti-resonance product testing method according to claim 1, characterized in that, Obtaining the resonant frequency of the test fixture specifically includes: A microphone and a speaker are installed on the acoustic testing fixture; The speaker plays audio at different frequencies, while the microphone receives sound signals. The sound signals received by the microphone are compared with the audio signals played by the speaker in real time, and the sound frequency at which the sound signal deviates abruptly from the audio signal is taken as the resonant frequency.
3. The anti-resonance product testing method according to claim 1, characterized in that, The test fixture also includes a motion test fixture, and obtaining the resonant frequency of the test fixture specifically includes: A vibration pickup is installed on the motion testing fixture; The power component of the motion test fixture is activated, and the vibration state of the motion test fixture is monitored by the vibration pickup of the motion test fixture. When the amplitude of the motion test fixture changes abruptly, the current vibration frequency is recorded as the resonance frequency.
4. The anti-resonance product testing method according to claim 3, characterized in that, Obtaining the resonant frequency of the test fixture specifically includes: An accelerometer is installed on the motion testing fixture; The drive motor of the motion test fixture is started, and the acceleration of the motion test fixture is monitored by the accelerometer. When the acceleration of the motion test fixture changes abruptly, the current vibration frequency of the motion test fixture is calculated, and the calculation result is the resonance frequency.
5. The anti-resonance product testing method according to claim 1, characterized in that, Monitoring the vibration frequency of the test fixture during the test specifically includes: The vibration state of the test fixture is monitored during the test by a vibration pickup installed on the test fixture, and the vibration frequency of the test fixture is obtained in real time. The specific methods for intervening in vibration input to the test fixture include: Intervention vibration is input to the test fixture by an exciter installed on the test fixture.
6. The anti-resonance product testing method according to any one of claims 1-5, characterized in that, After obtaining the resonant frequency of the test fixture, and before testing the product under test, the following steps are also included: The test fixture is brought into a resonant state; A verification vibration is input to the test fixture by an exciter installed on the test fixture; wherein the vibration frequency of the verification vibration is the same as the obtained resonance frequency, and the phase of the verification vibration is opposite to the vibration phase of the test fixture. The vibration state of the test fixture is detected by a vibration pickup installed on the test fixture, and the frequency of the verification vibration input to the test fixture is corrected accordingly until the vibration state of the test fixture tends to be still. Then, the frequency of the current verification vibration is output as the resonance frequency.
7. A product testing system for preventing resonance, characterized in that, include: A frequency acquisition module is used to acquire the resonant frequency of the test fixture, the test fixture including an acoustic test fixture. The frequency acquisition module includes: a vibration source, used to input vibrations of different frequencies to the acoustic test fixture; and a vibration pickup of the acoustic test fixture, used to monitor the vibration state of the acoustic test fixture and record the current vibration frequency as the resonant frequency when the amplitude of the acoustic test fixture changes abruptly. The test monitoring module is used to test the product under test through the test fixture according to the preset test procedure, and to monitor the vibration frequency of the test fixture during the test. The resonance intervention module is used to input intervention vibration to the test fixture when the vibration frequency of the test fixture reaches its resonance frequency; wherein the vibration frequency of the intervention vibration is the same as the resonance frequency of the test fixture, and the phase of the intervention vibration is opposite to the resonance phase of the test fixture.
8. The anti-resonance product testing system according to claim 7, characterized in that, The testing fixture also includes a motion testing fixture; The frequency acquisition module includes: The vibration pickup of the motion test fixture is used to monitor the vibration state of the motion test fixture after the power component of the motion test fixture is started, and to record the current vibration frequency as the resonance frequency when the amplitude of the motion test fixture changes abruptly.