A method for testing and evaluating abnormal vibration and noise of an automobile outside mirror

Abstract

The present application relates to a kind of automobile exterior mirror abnormal vibration and noise test and evaluation method, including statistical analysis user door closing speed distribution;Determine the maximum evaluation door closing speed, average door closing speed and minimum door closing speed;Determine the test evaluation process of exterior mirror abnormal vibration and noise;Install vibration sensor and artificial head;Coupling data acquisition system;Test the vibration and noise value of door closing process;Determine the limit of abnormal vibration and abnormal sound;Run vibration automatic judgment program, the vibration signal collected is data processing, determine whether there is abnormal vibration and abnormal sound, and give the maximum displacement value of rearview mirror in door closing process;Test at least 5 samples;Remove test equipment, complete test.The method improves the system and professionalism of automobile exterior mirror NVH test and evaluation, from user perception, realize the evaluation of user to exterior mirror vibration and abnormal sound when door closing, with simple and clear, easy to operate, evaluation accuracy higher and the like.

Description

Technical Field

[0001] This invention belongs to the field of automotive development technology, specifically relating to a method for testing and evaluating abnormal vibrations and noise in automotive exterior rearview mirrors. Background Technology

[0002] As consumers demand higher quality and superior manufacturing processes from automobiles, abnormal vibrations and noises from exterior rearview mirrors during door closing have become a significant concern, impacting purchasing decisions and user satisfaction. Currently, the industry lacks publicly available testing and evaluation methods for abnormal vibrations and noises in automotive exterior rearview mirrors. Analysis is still based on user complaints, without systematic research and analysis of user scenarios, and without clearly defined methods and rules for identifying abnormal vibrations and noises. Consequently, it is impossible to comprehensively predict and provide definitive conclusions regarding potential user issues during product development. Summary of the Invention

[0003] The purpose of this invention is to provide a method for testing and evaluating abnormal vibrations and noise of automotive exterior rearview mirrors, in order to solve the problem of being unable to predict and evaluate abnormal vibrations and noise of automotive exterior rearview mirrors during product development.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A method for testing and evaluating abnormal vibrations and noise in automotive exterior rearview mirrors, comprising the following steps:

[0006] A. Based on a certain sample of user usage scenarios, statistically analyze the distribution of user door closing speed;

[0007] B. Determine the three closing evaluation conditions: maximum closing speed, average closing speed, and minimum closing speed;

[0008] C. Determine the location and number of measurement points for abnormal vibration and noise based on the location most easily perceived by the user, and determine the test and evaluation process for abnormal vibration and noise of the exterior rearview mirror.

[0009] D. Install vibration sensors and artificial heads at the determined vibration and noise measurement points;

[0010] E. Connect the data acquisition system and set appropriate acquisition frequency and analysis bandwidth;

[0011] F. Close the door at three different speeds and test the vibration and noise levels during the closing process;

[0012] G. Determine the limits for abnormal vibrations and noises based on the user's visual perception of the critical state.

[0013] H. Run the automatic vibration judgment program to process the collected vibration signals, determine whether there is abnormal vibration and noise, and give the maximum displacement value of the rearview mirror during the closing process.

[0014] I. Repeat step DH to test at least 5 samples;

[0015] J. Remove the test equipment and complete the test.

[0016] Further, in step A, users select users of different professions, ages, and genders to conduct a door-opening and closing survey, with a sample size of no less than 50 people.

[0017] Further, step B specifically involves: installing a door closing speed measuring device on the car door, statistically analyzing the speed at which the user closes the door, sorting the statistical results from smallest to largest, selecting the closing speed greater than 95% of the statistical sample as the maximum closing speed, the average of the statistical samples as the average closing speed, and the closing speed greater than 5% of the statistical samples as the minimum evaluation speed.

[0018] Further, step C, determining the noise measurement points and evaluation locations, includes the following steps:

[0019] C1. Select the noise test and evaluation location when the vehicle door is closed: Assume that the distance from the user to the center point of the exterior rearview mirror in the X direction is Dx and the distance in the Y direction is Dy when the door is opened and closed. Calculate the X and Y distances D1x, D2x...Dnx and D1y, D2y...Dny when all evaluators evaluate the noise. Select the values ​​Dxt and Dyt of users whose distances are less than 95% as the final noise test and evaluation locations. The height of the noise measurement point is set at 1.5m.

[0020] C2. Noise test and evaluation location when the vehicle door is closed: The test points are set on the passenger seats corresponding to the door to be tested. For adjustable seats, the seats are adjusted to the middle position with the backrest at a 90-degree right angle. The distance between the artificial head's ears and the seat surface is guaranteed to be 70±2cm. If necessary, the seat belt can be used for fixation.

[0021] Furthermore, step C, measuring point and evaluation location, includes the following steps: taking the far end of the exterior rearview mirror, which is most easily observed by a person, as the vibration measuring point. This is also the point farthest from the rearview mirror installation point and has the largest vibration displacement.

[0022] Further, step F specifically involves: installing a door closing speed measuring device on the car door, opening and closing the door according to the three door closing speeds determined in step B, making a subjective evaluation while closing the door, and simultaneously collecting vibration and noise signals during the door closing process. The evaluation of abnormal noise and vibration needs to be carried out both inside and outside the vehicle to cover all user usage scenarios.

[0023] Furthermore, abnormal noise is assessed through subjective evaluation. This can be done by conducting on-site subjective evaluation when the door is closed or by playing back the collected sound signal in the listening room. There must be at least two on-site evaluators and at least three people conducting the sound playback evaluation in the listening room. A subjective score of 7 or higher is considered acceptable, while a score of less than 7 requires improvement.

[0024] Further, step G, determining the abnormal vibration limit, includes the following steps: based on the vibration visual perception limit, using the vibration displacement as a measure, if the maximum vibration displacement of the outermost edge of the rearview mirror when the door is closed is less than 8mm, it is acceptable; if it is greater than or equal to 8mm, it is judged to be an abnormal vibration.

[0025] Further, step H specifically involves: running an automatic vibration judgment program, integrating the collected vibration signals, obtaining the maximum displacement value of the outer edge of the rearview mirror, comparing it with the abnormal vibration limit, and automatically giving a conclusion on whether there is abnormal vibration and the maximum displacement value of the rearview mirror during the door closing process.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] This invention, based on a specific user sample, statistically analyzes user scenarios and various user habits regarding door closing. It proposes for the first time three door-closing evaluation conditions: maximum closing speed, average closing speed, and minimum closing speed. Simultaneously, it clarifies the testing and evaluation locations for abnormal vibration and noise, utilizing vibration sensors and microphones to measure vibration and noise values ​​at the measurement points. By developing a method for judging abnormal noise and vibration and implementing programmed automatic identification, problems can be quickly identified and judged, thus forming a complete method for testing and evaluating abnormal vibration and noise in automotive exterior rearview mirrors. This method enhances the systematicness and professionalism of NVH testing and evaluation of automotive exterior rearview mirrors, truly starting from user perception and reducing user complaints about vibration and abnormal noise from exterior rearview mirrors when closing doors. The method is simple, clear, easy to operate, and has high evaluation accuracy. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 Flowchart of the testing and evaluation methods for abnormal vibration and noise of automotive exterior rearview mirrors;

[0030] Figure 2 Schematic diagram of the installation location of the door closing speed measuring instrument;

[0031] Figure 3 Schematic diagram showing the location of external noise measurement points;

[0032] Figure 4 Schematic diagram of the location of noise measurement points inside the vehicle. Detailed Implementation

[0033] The present invention will be further described below with reference to embodiments:

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0035] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] This invention aims to provide a testing and evaluation method for abnormal vibration and noise of automotive exterior rearview mirrors based on user scenario analysis. Firstly, at the technical level, a certain number of user door closing speed tests and statistical analyses are conducted to determine three door closing evaluation conditions: maximum evaluation closing speed, average closing speed, and minimum closing speed. Simultaneously, the location and number of measurement points for abnormal vibration and noise are determined based on the most easily perceived locations by users, thus defining the testing and evaluation method for abnormal vibration and noise of the exterior rearview mirror. Then, based on the user's visual perception threshold, the limit value for abnormal vibration is determined and programmed, automatically determining the presence of abnormal vibration based on the test results. In terms of the testing process, an accelerometer and microphone are installed according to the determined testing and evaluation method for abnormal vibration and noise of the exterior rearview mirror, connected to a data acquisition system for test settings, and then the door is closed at the three determined speeds. The vibration and noise values ​​during the closing process are tested, and an automatic judgment program is run and the sound is played back to determine whether abnormal vibration and abnormal noise of the rearview mirror exist during the closing process.

[0037] This invention provides a method for testing and evaluating abnormal vibrations and noise in automotive exterior rearview mirrors, comprising the following steps:

[0038] A. Based on a sample of user scenarios, statistically analyze the distribution of user door closing speeds. The survey will involve users of different professions, ages, and genders, with a sample size of at least 50 people.

[0039] B. Determine three door closing evaluation conditions: maximum evaluation closing speed, average closing speed, and minimum closing speed. Specifically, install a door closing speed measuring device on the door, statistically analyze the speed at which the user closes the door, sort the results from smallest to largest, select the closing speed greater than 95% of the statistical sample as the maximum closing speed, the average closing speed as the average of the statistical samples, and the closing speed greater than 5% of the statistical samples as the minimum evaluation speed.

[0040] C. Determine the location and number of measurement points for abnormal vibration and noise based on the location most easily perceived by the user, and determine the test and evaluation process for abnormal vibration and noise of the exterior rearview mirror.

[0041] The determination of noise measurement points and evaluation locations includes the following steps:

[0042] C1. Select the noise test and evaluation location when the vehicle door is closed: Assume that the distance from the user to the center point of the exterior rearview mirror in the X direction is Dx and the distance in the Y direction is Dy when the door is opened and closed. Calculate the X and Y distances D1x, D2x...Dnx and D1y, D2y...Dny when all evaluators evaluate the noise. Select the values ​​Dxt and Dyt of users whose distances are less than 95% as the final noise test and evaluation locations. The height of the noise measurement point is set at 1.5m.

[0043] C2. Noise test and evaluation location when the vehicle door is closed: The test points are set on the passenger seats corresponding to the door to be tested. For adjustable seats, the seats are adjusted to the middle position with the backrest at a 90-degree right angle. The distance between the artificial head's ears and the seat surface is guaranteed to be 70±2cm. If necessary, the seat belt can be used for fixation.

[0044] The measurement point and evaluation location include the following steps: take the far end of the exterior rearview mirror, which is the easiest for a person to observe, as the vibration measurement point. This is also the point farthest from the rearview mirror installation point and has the largest vibration displacement.

[0045] D. Install vibration sensors and artificial heads at the determined vibration and noise measurement points.

[0046] E. Connect the data acquisition system and set appropriate acquisition frequency and analysis bandwidth.

[0047] F. Close the door at three different speeds and test the vibration and noise levels during the closing process. Specifically, install a door closing speed measuring device on the door, open and close the door at the three closing speeds determined in step B, and conduct subjective evaluations while closing the door. Simultaneously collect vibration and noise signals during the closing process. Evaluations of abnormal noise and vibration should be conducted both inside and outside the vehicle to cover all user scenarios. Abnormal noise is evaluated subjectively, either through on-site subjective evaluation during door closing or by playing back the collected sound signals in a listening room. At least two people should conduct on-site evaluations, and at least three people should conduct sound playback evaluations in the listening room. A subjective score of 7 or higher is considered passing; a score below 7 requires improvement.

[0048] G. Determine the limits for abnormal vibration and noise based on the user's visual perception threshold. The determination of abnormal vibration limits includes the following steps: Based on the vibration visual perception limit, using the vibration displacement as a measure, if the maximum vibration displacement of the outermost edge of the rearview mirror is less than 8mm when the door is closed, it is acceptable; if it is greater than or equal to 8mm, it is judged as having abnormal vibration.

[0049] H. Run the automatic vibration judgment program to process the collected vibration signals, determine whether there is abnormal vibration or noise, and provide the maximum displacement value of the rearview mirror during the door closing process. Specifically: run the automatic vibration judgment program, perform integral processing on the collected vibration signals, obtain the maximum displacement value of the outer edge of the rearview mirror, compare it with the abnormal vibration limit, and automatically give a conclusion on whether there is abnormal vibration and the maximum displacement value of the rearview mirror during the door closing process.

[0050] I. Repeat step DH to test at least 5 samples;

[0051] J. Remove the test equipment and complete the test.

[0052] Example 1

[0053] like Figure 1 As shown, a method for testing and evaluating abnormal vibrations and noise in automotive exterior rearview mirrors includes the following steps:

[0054] 1. Based on a sample of user scenarios, statistical analysis is used to determine the closing speed, test evaluation location, and evaluation method.

[0055] Step S1: Survey user selection:

[0056] A door-opening survey was conducted among users of different professions, ages, and genders, with a sample size of no less than 50 people to ensure that the statistical results are representative.

[0057] Step S2, Determining the door closing condition:

[0058] Install a door closing speed measuring device on the vehicle door. See [link / details] for installation method and location. Figure 2 As shown, the closing speed of the user's door was statistically analyzed, and the results were sorted from smallest to largest (v1, v2, ..., vn). The closing speed greater than 95% of the statistical samples was selected as the maximum closing speed, the average closing speed was selected as the average closing speed, and the closing speed greater than 5% of the statistical samples was selected as the minimum evaluation speed. Considering different driving habits and the masking effect of door closing sound on abnormal noise from the rearview mirror, the abnormal vibration and noise of the rearview mirror during the closing process were ultimately evaluated using the three closing conditions: maximum closing speed, average closing speed, and minimum closing speed.

[0059] Step S3: Determining the location of noise measurement points and evaluation points:

[0060] (1) Selection of the location for noise testing and evaluation when the vehicle door is closed from the outside:

[0061] Assuming the distance from the user to the center point of the exterior rearview mirror in the X direction is Dx, and the distance in the Y direction is Dy when the door is opened or closed, calculate the X and Y distances D1x, D2x...Dnx and D1y, D2y...Dny for all evaluators. Select the values ​​Dxt and Dyt, which are less than 95% of the distances for users, as the final noise testing and evaluation locations, with the noise measurement point height set at 1.5m. This selection ensures that the auditory experience of the vast majority of users is covered during testing and evaluation, as shown in the attached diagram. Figure 3 As shown.

[0062] (2) Location for noise testing and evaluation when the vehicle door is closed:

[0063] The testing points inside the vehicle are located on the occupant seats corresponding to the doors being tested. A test artificial head designed to incorporate the physiological structure of the human ear can be used, or a professional microphone can be employed. For adjustable seats, the seat is adjusted to the center position with the backrest at a 90-degree angle. The distance between the artificial head's ears and the seat surface is maintained at (70±2) cm. If necessary, a seatbelt can be used for securing the artificial head. (Specific details are as follows...) Figure 4 As shown.

[0064] Step S4: Determining the vibration measuring points and evaluation locations:

[0065] The vibration measurement point is the far end of the exterior rearview mirror, which is most easily observed by the human eye. This point is also the furthest from the mirror's mounting point and has the largest vibration displacement. Figure 3 As shown.

[0066] 2. Identify abnormal vibrations and noises and automate the process.

[0067] Step S5: Determining Abnormal Vibration Limits:

[0068] Based on the visual perception limit of vibration, and using the amount of vibration displacement as the measurement index, it is acceptable if the maximum vibration displacement of the outermost edge of the rearview mirror is less than 8mm when the door is closed, and it is judged to be abnormal vibration if it is greater than or equal to 8mm.

[0069] Step S6, Data Processing and Programming:

[0070] Using the software interface of the data acquisition system, the acquired vibration signal is integrated through programming to obtain the maximum displacement value of the outer edge of the rearview mirror. This value is then compared with the abnormal vibration limit to automatically determine whether abnormal vibration exists and the maximum displacement value of the rearview mirror during the door closing process.

[0071] Step S7, Evaluation method for abnormal noise:

[0072] Abnormal noise is assessed subjectively, either by on-site evaluation with the door closed or by playing back the collected sound signal in the listening room. At least two people must be present for on-site evaluation, and at least three people for evaluation during sound playback in the listening room. A subjective score of 7 or higher is considered passing; a score below 7 requires improvement. The subjective scoring table for abnormal noise issues is shown in Table 1.

[0073] Table 1

[0074]

[0075]

[0076] 3. Determine the testing procedure for abnormal vibration and noise of automotive exterior rearview mirrors.

[0077] Based on the above-mentioned test and evaluation locations and working conditions for abnormal vibration and noise of exterior rearview mirrors, the test procedure for abnormal vibration and noise of automotive exterior rearview mirrors is determined as follows:

[0078] Step S8: Install vibration sensors and artificial heads (or professional microphones) at the vibration and noise measurement point locations determined in steps S3 and S4.

[0079] Step S9: Connect the data acquisition system and set appropriate parameters such as acquisition frequency and analysis bandwidth.

[0080] Step S10: Install a door closing speed measuring device on the car door, open and close the door according to the three closing speeds determined in step S2, make a subjective evaluation while closing the door, and collect vibration and noise signals during the closing process. The evaluation of abnormal noise and vibration needs to be carried out simultaneously inside and outside the vehicle to cover all user scenarios.

[0081] Step S11: Run the automatic vibration judgment program compiled in step S6 to determine whether there is abnormal vibration and give the maximum displacement value of the rearview mirror during the closing process.

[0082] Step S12: Due to installation and manufacturing errors, there is a certain dispersion in the vibration and abnormal noise of the rearview mirror. Therefore, it is necessary to repeat the above steps S8-S11 and test at least 5 samples.

[0083] Step S13: Remove the test equipment to complete the test.

[0084] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for testing and evaluating abnormal vibration and noise of automotive exterior rearview mirrors, characterized in that, Includes the following steps: A. Based on a certain sample of user usage scenarios, statistically analyze the distribution of user door closing speed; B. Determine the three closing evaluation conditions: maximum closing speed, average closing speed, and minimum closing speed; C. Determine the location and number of measurement points for abnormal vibration and noise based on the location most easily perceived by the user, and determine the test and evaluation process for abnormal vibration and noise of the exterior rearview mirror. D. Install vibration sensors and artificial heads at the determined vibration and noise measurement points; E. Connect the data acquisition system and set appropriate acquisition frequency and analysis bandwidth; F. Close the door at three different speeds and test the vibration and noise levels during the closing process; G. Determine the limits for abnormal vibrations and noises based on the user's visual perception of the critical state. H. Run the automatic vibration judgment program to process the collected vibration signals, determine whether there is abnormal vibration and noise, and give the maximum displacement value of the rearview mirror during the closing process. I. Repeat step DH to test at least 5 samples; J. Dismantle the test equipment and complete the test; Step F specifically involves: installing a door closing speed measuring device on the car door, opening and closing the door according to the three door closing speeds determined in step B, making a subjective evaluation while closing the door, and collecting vibration and noise signals during the closing process. The evaluation of abnormal noise and vibration needs to be carried out simultaneously inside and outside the vehicle to cover all user scenarios. Step G, determining the abnormal vibration limit, includes the following steps: based on the vibration visual perception limit, using the vibration displacement as the measurement index, if the maximum vibration displacement of the outermost edge of the rearview mirror when the door is closed is less than 8mm, it is acceptable; if it is greater than or equal to 8mm, it is judged to be an abnormal vibration.

2. The method for testing and evaluating abnormal vibration and noise of a car exterior rearview mirror according to claim 1, characterized in that: Step A: Users select users of different professions, ages, and genders to conduct a door opening and closing survey, with a sample size of no less than 50 people.

3. The method for testing and evaluating abnormal vibration and noise of a car exterior rearview mirror according to claim 1, characterized in that, Step B specifically involves: installing a door closing speed measuring device on the car door, statistically analyzing the speed at which the user closes the door, sorting the statistical results from smallest to largest, selecting the closing speed greater than 95% of the statistical sample as the maximum closing speed, the average of the statistical samples as the average closing speed, and the closing speed greater than 5% of the statistical samples as the minimum evaluation speed.

4. The method for testing and evaluating abnormal vibration and noise of a car exterior rearview mirror according to claim 1, characterized in that, Step C, determining the noise measurement points and evaluation locations, includes the following steps: C1. Select the noise test and evaluation location when the vehicle door is closed: Assume that the distance from the user to the center point of the exterior rearview mirror in the X direction is Dx and the distance in the Y direction is Dy when the door is opened and closed. Calculate the X and Y distances D1x, D2x...Dnx and D1y, D2y...Dny when all evaluators evaluate the noise. Select the values ​​Dxt and Dyt of users whose distances are less than 95% as the final noise test and evaluation location. The height of the noise measurement point is set at 1.5m. C2. Noise test and evaluation location when the vehicle door is closed: The test points are set on the passenger seats corresponding to the door to be tested. For adjustable seats, the seats are adjusted to the middle position with the backrest at a 90-degree angle. The distance between the artificial head's ears and the seat surface is guaranteed to be 70±2cm, and the seats are secured with seat belts.

5. The method for testing and evaluating abnormal vibration and noise of a car exterior rearview mirror according to claim 4, characterized in that, Step C, measuring point and evaluation location, includes the following steps: take the far end of the exterior rearview mirror, which is most easily observed by a person, as the vibration measuring point. This is also the point farthest from the rearview mirror installation point and has the largest vibration displacement.

6. The method for testing and evaluating abnormal vibration and noise of a car exterior rearview mirror according to claim 1, characterized in that, Abnormal noise is assessed through subjective evaluation. This can be done by conducting a subjective evaluation on-site when the door is closed or by playing back the collected sound signal in the listening room. There should be no fewer than two on-site evaluators and no fewer than three people conducting the sound playback evaluation in the listening room. A subjective score of 7 or higher is considered acceptable, while a score of less than 7 requires improvement.

7. The method for testing and evaluating abnormal vibration and noise of a car exterior rearview mirror according to claim 1, characterized in that, Step H specifically involves running an automatic vibration judgment program, integrating the collected vibration signals, obtaining the maximum displacement value of the outer edge of the rearview mirror, comparing it with the abnormal vibration limit, and automatically giving a conclusion on whether there is abnormal vibration and the maximum displacement value of the rearview mirror during the door closing process.

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