CN116429245B - Method and system for testing noise of wiper motor - Google Patents
Method and system for testing noise of wiper motor Download PDFInfo
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- CN116429245B CN116429245B CN202310695351.8A CN202310695351A CN116429245B CN 116429245 B CN116429245 B CN 116429245B CN 202310695351 A CN202310695351 A CN 202310695351A CN 116429245 B CN116429245 B CN 116429245B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H13/00—Measuring resonant frequency
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention discloses a method and a system for testing noise of a wiper motor, wherein the method specifically comprises the following steps: a wiper motor noise test bench is built in the anechoic room; subjective noise testing of the wiper motor is conducted; objective noise testing of the wiper motor is carried out; the objective noise test of the wiper motor comprises an air noise test of the wiper motor and a structural noise test of the wiper motor; evaluating whether subjective noise meets the requirement; and evaluating whether the air noise and the structural noise meet the requirements. According to the invention, the noise testing rack of the wiper motor is built in the silencing room to test the noise of the wiper motor body, so that noise interference signals generated by the wiper and other parts of the whole automobile are avoided, and the noise performance of the wiper motor body can be objectively evaluated.
Description
Technical Field
The invention relates to the technical field of automobile vibration and noise control, in particular to a method and a system for testing the noise of a wiper motor.
Background
With the vigorous development of the automobile industry, the life quality of people is continuously improved, and the requirements of people on automobile comfort, particularly automobile vibration and noise control, are higher and higher. The noise of the electrical accessories is very important performance in automobile noise, the front wiper and the rear wiper are important components of automobile electrical accessories, the noise of the automobile electrical accessories which are concerned by consumers is directly influenced by the noise generated during the operation of the motor, and the noise testing and evaluation of the wiper motor are very important engineering significance for optimizing the noise of the wiper motor body.
However, at present, a vibration and noise test for a wiper product is generally aimed at the study of a wiper, and a sound signal in the running process of the wiper is collected, and a test method for the noise of a wiper motor body is not provided yet; in addition, vibration and noise in the running process of the windscreen wiper are tested in the prior art, and the windscreen wiper is required to be installed on a vehicle, so that noise interference signals generated by other parts of the whole vehicle are difficult to avoid, and a certain deviation exists between a test result and an actual result.
Disclosure of Invention
The invention aims to improve and innovate defects and problems existing in the background technology, and provides a method and a system for testing noise of a wiper motor.
According to a first aspect of the present invention, there is provided a method for testing noise of a wiper motor, including:
a wiper motor noise test bench is built in the anechoic room;
subjective noise testing of the wiper motor is conducted;
objective noise testing of the wiper motor is carried out;
the objective noise test of the wiper motor comprises an air noise test of the wiper motor and a structural noise test of the wiper motor;
when the air noise test of the wiper motor is carried out, measuring and recording the air noise emitted by the wiper motor in the running process; when the structural noise test of the wiper motor is carried out, the structural noise emitted in the running process of the wiper motor is measured and recorded;
Evaluating whether subjective noise meets the requirement;
evaluating whether the air noise and the structural noise meet the requirements;
wherein, the wiper motor is the front wiper motor and the back wiper motor without the crank.
According to the technical scheme, the noise testing rack of the wiper motor is built in the noise elimination chamber, subjective testing and objective testing of the noise of the wiper motor body are carried out, noise interference signals generated by the wiper and other parts of the whole automobile can be avoided, the noise performance of the wiper motor body can be objectively evaluated, and the vibration noise is ensured to reach the standard from the source of the wiper (the wiper motor body); the objective test comprises an air noise test and a structural noise test, so that the noise performance of the wiper motor body can be evaluated more objectively and comprehensively, and the subjective noise evaluation is combined, so that the noise performance of the wiper motor body is evaluated through multi-dimensional analysis, and the noise performance of the wiper motor body is evaluated more comprehensively.
The further scheme is that the step of building the wiper motor noise test bench in the silencing room specifically comprises the following steps:
the wiper motor is vertically suspended in a silencing chamber, and the noise level of the silencing chamber is smaller than a first preset noise value; the wiper motor is vertically suspended on the top wall of the anechoic chamber through an elastic rope, and the elastic suspension resonance frequency of the wiper motor and the elastic rope is less than 2Hz, so that the rigid body mode frequency is ensured to be less than the elastic mode frequency by more than 10%;
The wiring terminal of the wiper motor is connected with an external power supply through a wire.
According to the technical scheme, the wiper motor is suspended by the elastic rope, so that the rigid mode frequency of the system is smaller than 10% of the elastic mode frequency, and when the resonance frequency is high, the vibration quantity measured by the vibration acceleration sensor is possibly contained irrelevant components such as the elastic rope, and the measurement error of the vibration acceleration sensor is reduced.
The further scheme is that the step of carrying out subjective noise test of the wiper motor specifically comprises the following steps:
placing the wiper motor in a low-temperature box at the temperature of minus 40 ℃ for at least 4 hours until the temperature of the wiper motor is kept stable;
vertically suspending the cooled wiper motor in a sound-deadening chamber, and applying 13.3-13.7V voltage to a wiring terminal of the wiper motor;
sequentially selecting a high-speed gear and a low-speed gear, carrying out no-load operation on the front wiper motor, carrying out no-load operation on the rear wiper motor, and continuously reducing the voltage applied at the connecting terminal in preset time to cover the rotating speed range of the wiper motor;
observing whether resonance phenomenon occurs in the wiper motor in the deceleration process, and recording the voltage range in which the resonance phenomenon occurs to obtain a target voltage range;
And subjective evaluation staff performs subjective evaluation on the noise according to the specific expression of the heard noise.
According to the technical scheme, the cooled wiper motor is operated on the wiper motor noise test rack, and in the process of subjective evaluation personnel performing noise subjective evaluation, the noise of the wiper motor under different voltages is specifically expressed through hearing and vision evaluation, so that the phenomenon of resonance in the process of reducing the voltage applied by the connecting terminal can be observed at the same time, and a target voltage range is obtained.
The step of continuously reducing the voltage applied at the connecting terminal in the preset time to cover the rotating speed range of the wiper motor specifically comprises the following steps:
firstly, continuously reducing the voltage applied at the connecting terminal with a first interval voltage to cover the rotating speed range of the wiper motor;
when the phenomenon that the wiper motor resonates during the deceleration process is observed, the voltage applied to the connecting terminal is continuously reduced by a second interval voltage, wherein the second interval voltage is smaller than the first interval voltage.
The further scheme is that the step of carrying out objective noise test of the wiper motor specifically comprises the following steps:
the method comprises the steps that noise meters are respectively arranged right above the rear surfaces of a wiper motor gear box and a vehicle body mounting surface, right above the axis of a wiper motor and perpendicular to the wiper motor gear box and the vehicle body mounting surface and right behind the tail of the wiper motor along the axis of the wiper motor, and the noise meters in all directions are separated from the wiper motor by preset distances;
A vibration acceleration sensor is arranged on a front wiper motor gear box shell or at the output end of a rear wiper motor gear box;
the noise instrument and the vibration acceleration sensor are connected with the collector through data lines;
applying 13.3-13.7V voltage at a connecting terminal of the wiper motor;
sequentially selecting a front wiper motor for idle running of a high-speed gear and a low-speed gear, wherein the running time of the front wiper motor and the rear wiper motor is not more than 10 minutes after idle running;
each noise instrument respectively measures air noise in the running process of the wiper motor;
the vibration acceleration sensor measures structural noise in the running process of the wiper motor;
the collector screens air noise in the frequency range of 0.1-10KHz, uses a filter to record the noise value corresponding to 1/3 frequency multiplication air noise in the frequency range of 0.1-10KHz, and averages the noise values measured by each noise instrument for multiple times;
the collector screens the structural noise in the frequency range of 0.1-10KHz and calibrates the weight acceleration to 9.81 m/s 2 And recording a noise value corresponding to the 1/3 frequency multiplication structure noise by using a filter within the frequency range of 0.1-10KHz, and averaging the noise values measured by the vibration acceleration sensor for multiple times.
According to the technical scheme, the noise instrument and the vibration acceleration sensor are adopted to simultaneously and respectively measure the air noise and the structural noise of the wiper motor body, so that the noise of different wiper motor bodies can be tested, evaluated and analyzed based on a unified test method, the noise performance of the wiper motor body can be evaluated more objectively and comprehensively, and the noise performance of the wiper motor body can be evaluated comprehensively based on a unified test method.
Further, the step of performing objective noise test of the wiper motor further includes:
continuously reducing the voltage at the connecting terminal at a second interval voltage at the connecting terminal of the wiper motor, wherein the voltage is within a target voltage range;
each noise instrument respectively measures air noise in the running process of the wiper motor;
the vibration acceleration sensor measures structural noise in the running process of the wiper motor;
the collector acquires a noise-frequency curve obtained by measurement;
and screening out a noise maximum value corresponding to the target voltage range, finding out a corresponding frequency according to the noise maximum value, and calculating the corresponding motor rotating speed through frequency conversion.
According to the technical scheme, objective noise test is guided through the target voltage range obtained through subjective test, so that the subjective test and the objective test complement each other and are matched with each other; the target voltage range is applied to the connecting terminal of the wiper motor at a second interval voltage, a corresponding vibration-frequency curve and motor rotating speed are obtained, the existence of resonance phenomenon can be confirmed through the vibration frequency curve, the corresponding motor rotating speed can guide the wiper motor to switch between a high-speed gear and a low-speed gear when the wiper motor runs on the whole car, and the motor rotating speed range which should be avoided is avoided, so that the resonance phenomenon occurs when the wiper motor runs on the whole car, and customer experience is affected.
The further scheme is that the step of evaluating whether the air noise and the structural noise meet the requirements specifically comprises the following steps:
evaluating whether the maximum noise value measured by each noise instrument of the front wiper motor is smaller than a third preset noise value when the front wiper motor operates in a high-speed gear and a low-speed gear within the frequency range of 0.1-2 KHz;
evaluating whether the maximum noise value measured by each noise instrument of the front wiper motor is smaller than a fourth preset noise value when the front wiper motor operates in a high-speed gear and a low-speed gear within the frequency range of 2-10 KHz;
Evaluating whether the maximum noise value measured by each noise instrument is smaller than a fifth preset noise value when the rear wiper motor operates within the frequency range of 0.1-10 KHz;
evaluating whether the maximum noise value measured by the vibration acceleration sensor of the front wiper motor is smaller than a sixth preset noise value when the front wiper motor operates in a high-speed gear and a low-speed gear within the frequency range of 0.1-0.4 KHz;
evaluating whether the maximum noise value measured by the vibration acceleration sensor of the front wiper motor is smaller than a seventh preset noise value when the front wiper motor operates in a high-speed gear and a low-speed gear within the frequency range of 0.4-10 KHz;
evaluating whether the maximum noise value measured by the vibration acceleration sensor of the rear wiper motor is smaller than an eighth preset noise value when the rear wiper motor operates within the frequency range of 0.1-0.4 KHz;
and evaluating whether the maximum noise value measured by the vibration acceleration sensor of the rear wiper motor is smaller than a ninth preset noise value when the rear wiper motor runs within the frequency range of 0.4-10 KHz.
Further, the step of evaluating whether subjective noise meets the requirement specifically includes:
when the noise heard by the subjective evaluator is embodied as noiseless, the subjective evaluator is rated as high, and the corresponding rating is rated as 10;
When the noise heard by the subjective evaluator is particularly detected by sound, the subjective evaluator is very good, and the corresponding grade is 9;
when the noise heard by the subjective evaluator is embodied as only reverse noise, the subjective evaluator is good, and the corresponding grading grade is 8 grade;
when the noise heard by the subjective evaluator is embodied as reverse noise and higher decibel squeak, the subjective evaluator is generally judged, and the corresponding grade is grade 7;
when the noise heard by the subjective evaluator is embodied as slightly low-decibel scraping noise, the subjective evaluator is judged to be in a critical state, and the corresponding grading grade is grade 6;
when the noise heard by the subjective evaluator is embodied as slight shake and moderate scratch, the subjective evaluator is judged to be in a critical state, and the corresponding grading grade is 5;
when the noise heard by the subjective evaluator is embodied as moderate and strong scraping noise, the subjective evaluator is judged to be bad, and the corresponding grade is grade 4;
when the noise heard by the subjective evaluator is embodied as strong shaking and strong scraping noise, the subjective evaluator is judged to be bad, and the corresponding grading grade is grade 3;
wherein the grading grade is above 6 grades, and subjective noise meets the requirements.
The further scheme is that the collector is Siemens vibration noise performance testing equipment, and the model of the collector is SCR2E05.
According to a second aspect of the present invention, there is provided a wiper motor noise test system, specifically comprising:
the building module is used for building a wiper motor noise test bench in the silencing room;
the subjective test module is used for carrying out subjective noise test on the wiper motor;
the objective testing module is used for carrying out objective noise testing on the wiper motor; the objective noise test of the wiper motor comprises an air noise test of the wiper motor and a structural noise test of the wiper motor;
when the air noise test of the wiper motor is carried out, measuring and recording the air noise emitted by the wiper motor in the running process; when the structural noise test of the wiper motor is carried out, the structural noise emitted in the running process of the wiper motor is measured and recorded;
the first evaluation module is used for evaluating whether subjective noise meets the requirement;
the second evaluation module is used for evaluating whether the air noise and the structural noise meet the requirements;
wherein, the wiper motor is the front wiper motor and the back wiper motor without the crank.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the noise testing rack of the wiper motor is built in the silencing room to subjectively and objectively test the noise of the wiper motor body, so that noise interference signals generated by the wiper and other parts of the whole automobile can be avoided, and the noise performance of the wiper motor body can be objectively evaluated; the objective test comprises an air noise test and a structural noise test, so that the noise performance of the wiper motor body can be evaluated more objectively and comprehensively, whether the difference between the air noise and the noise of the noise elimination chamber is larger than a second preset noise value or not is judged, the situation that the tested wiper motor body is inaccurate due to overlarge environmental noise of the noise elimination chamber can be avoided, and the subjective noise evaluation is combined, so that the noise performance of the wiper motor body is evaluated through multi-dimensional analysis, and the noise performance of the wiper motor body is evaluated more comprehensively. The noise test bench of the wiper motor is built, the noise meter and the vibration acceleration sensor are adopted to respectively measure the air noise and the structural noise of the wiper motor body, the cooled wiper motor is operated on the noise test bench of the wiper motor, so that subjective evaluation personnel can perform subjective evaluation on the noise, objective test and subjective test of the noise of the wiper motor body are based on a unified test method, the noise performance of the wiper motor body can be evaluated more objectively and comprehensively, and the motor performance can be fully known;
(2) Objective noise tests are guided through a target voltage range obtained through subjective tests, so that the subjective tests and the objective tests complement each other and are matched with each other; the voltage at the connecting terminal of the wiper motor is continuously reduced by the second interval voltage, wherein the voltage belongs to the target voltage range, a corresponding vibration-frequency curve and motor rotating speed are obtained, the existence of resonance phenomenon is confirmed through the vibration frequency curve in turn, the corresponding motor rotating speed can guide the wiper motor to switch between a high-speed gear and a low-speed gear when the wiper motor is operated on the whole car, and the motor rotating speed range which should be avoided is avoided, so that the resonance phenomenon occurs when the wiper motor is operated on the whole car, and the customer experience is affected.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a method for testing noise of a wiper motor according to a first embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a noise testing stand of a wiper motor according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a noise testing system for a wiper motor according to a second embodiment of the present invention.
Detailed Description
In order that the objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1, an embodiment of the present invention provides a method for testing noise of a wiper motor, which specifically includes the following steps:
step S1, a wiper motor noise test bench is built in a silencing room;
specifically, the wiper motor is vertically suspended in the silencing chamber, and the wiring end of the wiper motor is connected with an external power supply through a wire. The noise level of the anechoic chamber itself should be smaller than a first preset noise value, which in this embodiment is set to 30dB; the wiper motor is vertically suspended on the top wall of the anechoic chamber through an elastic rope, the elastic suspension resonance frequency of the wiper motor and the elastic rope is less than 2Hz, the rigid body mode frequency is ensured to be less than or equal to 10% of the elastic mode frequency, the elastic rope is in an inverted V shape, and the bottom end of the elastic rope is connected with the two ends of the wiper motor mounting plate.
The wiper motor is a front wiper motor and a rear wiper motor without a crank, and objects except a noise meter and an elastic rope are not arranged in the range of 65cm of the surrounding space of the wiper motor in the silencing chamber.
S2, subjective noise testing of the wiper motor is conducted;
specifically, placing the wiper motor in a low-temperature box at the temperature of minus 40 ℃ for at least 4 hours until the temperature of the wiper motor is kept stable;
Vertically suspending the cooled wiper motor in a sound-deadening chamber, and applying 13.3-13.7V voltage to a wiring terminal of the wiper motor;
sequentially selecting a high-speed gear and a low-speed gear, carrying out no-load operation on the front wiper motor, carrying out no-load operation on the rear wiper motor, and continuously reducing the voltage applied at the connecting terminal in preset time to cover the rotating speed range of the wiper motor; in the embodiment, the preset time is set to be 1-3 minutes, and in the testing process, the voltage of the wiper motor is continuously regulated until the rotating speed of the wiper motor is about 0;
observing whether resonance phenomenon occurs in the wiper motor in the speed reducing process, and recording a voltage range in which the resonance phenomenon occurs to obtain a target voltage range, wherein the resonance phenomenon comprises visible vibration accompanied with obvious noise;
and subjective evaluation staff performs subjective evaluation on the noise according to the specific expression of the heard noise.
It should be noted that if the rear wiper motor also includes a high gear and a low gear, the rear wiper motor may be operated in idle mode with the high gear and the low gear in order.
The step of continuously reducing the voltage applied at the connecting terminal in a preset time to cover the rotating speed range of the wiper motor specifically comprises the following steps:
firstly, continuously reducing the voltage applied at the connecting terminal with a first interval voltage to cover the rotating speed range of the wiper motor;
When resonance of the wiper motor during the deceleration is observed, the voltage applied to the connecting terminal is continuously reduced by a second interval voltage, wherein the second interval voltage is smaller than the first interval voltage. In the present embodiment, the first interval voltage is set to 0.3V, and the second interval voltage is set to 0.1V.
S3, carrying out objective noise test on the wiper motor;
specifically, the objective noise test of the wiper motor comprises the following steps:
step S301, respectively installing noise meters above the rear surfaces of the wiper motor gear box and the vehicle body mounting surface, perpendicular to the wiper motor gear box and the vehicle body mounting surface and perpendicular to the axis of the wiper motor, and along the axis of the wiper motor and right behind the tail part of the wiper motor, wherein the noise meters in all directions are spaced from the wiper motor by preset distances, and in the embodiment, the preset distances are 48 cm-52 cm, and the noise meters can be microphones;
step S302, a vibration acceleration sensor is arranged on a front wiper motor gear box shell or at the output end of a rear wiper motor gear box, and the vibration acceleration sensor is used for measuring the vibration displacement of a wiper motor body;
step S303, the noise instrument and the vibration acceleration sensor are connected with the collector through data lines; the model of the collector is SCR2E05, the collector can be used for collecting signals such as vibration, noise, vehicle speed and rotating speed, and converting vibration displacement measured by a vibration acceleration sensor into corresponding noise values, and the built wiper motor noise test bench is shown in fig. 2.
Step S304, applying 13.3-13.7V voltage at a connecting terminal of the wiper motor;
step S305, sequentially selecting a front wiper motor for idle running of a high-speed gear and a low-speed gear, wherein the running time of the front wiper motor and the rear wiper motor is not more than 10 minutes after idle running;
step S306, each noise instrument respectively measures air noise in the running process of the wiper motor;
step S307, the vibration acceleration sensor measures structural noise in the running process of the wiper motor;
in the process of measuring the air noise in the running process of the wiper motor by the noise meter, the vibration acceleration sensor simultaneously measures the vibration displacement in the running process of the wiper motor, namely the structural noise in the running process of the wiper motor.
Step S308, the collector screens the air noise in the frequency range of 0.1-10KHz, the filter is used for recording the noise value corresponding to 1/3 frequency multiplication air noise in the frequency range of 0.1-10KHz, and the average value is obtained for the noise value measured by each noise instrument for multiple times;
step S309, the collector screens the structural noise in the frequency range of 0.1-10KHz, and calibrates the weight acceleration to 9.81 m/S 2 And recording a noise value corresponding to the 1/3 frequency multiplication structure noise by using a filter within the frequency range of 0.1-10KHz, and averaging the noise values measured by the vibration acceleration sensor for multiple times.
It should be noted that, the objective noise test of the wiper motor further includes the following steps:
continuously reducing the voltage at the connecting terminal at a second interval voltage at the connecting terminal of the wiper motor, wherein the voltage is within a target voltage range;
each noise instrument respectively measures air noise in the running process of the wiper motor;
the vibration acceleration sensor measures structural noise in the running process of the wiper motor;
the collector acquires a noise-frequency curve obtained by measurement;
the collector screens out a noise maximum value corresponding to the target voltage range, finds out a corresponding frequency according to the noise maximum value, and calculates a corresponding motor rotating speed range through frequency conversion; when resonance occurs, the noise-frequency curve may spike, and the resonance is confirmed by the spike, wherein the maximum value of the noise is the spike of the noise-frequency curve.
It can be understood that the objective noise test is guided through the target voltage range obtained by the subjective test, so that the subjective test and the objective test complement each other and are matched with each other; the voltage at the connecting terminal of the wiper motor is continuously reduced by the second interval voltage, wherein the voltage belongs to the target voltage range, a corresponding vibration-frequency curve and motor rotating speed are obtained, the existence of resonance phenomenon is confirmed through the vibration frequency curve in turn, the corresponding motor rotating speed can guide the wiper motor to switch between a high-speed gear and a low-speed gear when the wiper motor is operated on the whole car, and the motor rotating speed range which should be avoided is avoided, so that the resonance phenomenon occurs when the wiper motor is operated on the whole car, and the customer experience is affected.
S4, evaluating whether objective noise meets the requirement;
specifically, whether the maximum noise value measured by each noise instrument is smaller than a third preset noise value or not when the front wiper motor runs in a frequency range of 0.1-2KHz is evaluated, and in the embodiment, the third preset noise value is set to be 40dB;
evaluating whether the maximum noise value measured by each noise instrument of the front wiper motor is smaller than a fourth preset noise value in the frequency range of 2-10KHz when the front wiper motor operates in a high-speed gear and a low-speed gear, wherein the fourth preset noise value is set to be 45dB in the embodiment;
evaluating whether the maximum noise value measured by each noise meter is smaller than a fifth preset noise value when the rear wiper motor operates within the frequency range of 0.1-10KHz, wherein the fifth preset noise value is set to be 50dB in the embodiment;
evaluating whether the maximum noise value measured by the vibration acceleration sensor of the front wiper motor is smaller than a sixth preset noise value or not when the front wiper motor operates in a high-speed gear and a low-speed gear within a frequency range of 0.1-0.4KHz, wherein the sixth preset noise value is set to be-30 dB in the embodiment;
evaluating whether the maximum noise value measured by the vibration acceleration sensor of the front wiper motor is smaller than a seventh preset noise value or not when the front wiper motor operates in a high-speed gear and a low-speed gear within the frequency range of 0.4-10KHz, wherein the seventh preset noise value is set to be-10 dB in the embodiment;
Evaluating whether the maximum noise value measured by the vibration acceleration sensor of the rear wiper motor is smaller than an eighth preset noise value or not when the rear wiper motor operates within the frequency range of 0.1-0.4KHz, wherein the eighth preset noise value is set to be-30 dB in the embodiment;
the evaluation is made as to whether the maximum noise value measured by the vibration acceleration sensor when the rear wiper motor is running is smaller than a ninth preset noise value, which is set to-10 dB in this embodiment, in the frequency range of 0.4-10 KHz.
In this embodiment, the noise value corresponding to the individual frequency is allowed to exceed the preset noise value.
S5, evaluating whether subjective noise meets the requirement;
specifically, as shown in the following table 1, when the noise heard by the subjective evaluator is embodied as no noise, the subjective evaluator is judged to be high, and the corresponding grade is 10;
when the noise heard by the subjective evaluator is particularly detected by sound, the subjective evaluator is very good, and the corresponding grade is 9;
when the noise heard by the subjective evaluator is embodied as only reverse noise, the subjective evaluator is good, and the corresponding grading grade is 8 grade;
when the noise heard by the subjective evaluator is embodied as reverse noise and higher decibel squeak, the subjective evaluator is generally judged, and the corresponding grade is grade 7;
When the noise heard by the subjective evaluator is embodied as slightly low-decibel scraping noise, the subjective evaluator is judged to be in a critical state, and the corresponding grading grade is grade 6;
when the noise heard by the subjective evaluator is embodied as slight shake and moderate scratch, the subjective evaluator is judged to be in a critical state, and the corresponding grading grade is 5;
when the noise heard by the subjective evaluator is embodied as moderate and strong scraping noise, the subjective evaluator is judged to be bad, and the corresponding grade is grade 4;
when the noise heard by the subjective evaluator is embodied as strong shaking and strong scraping noise, the subjective evaluator is judged to be bad, and the corresponding grading grade is grade 3;
it should be noted that when the score level is 6 or more, subjective noise satisfies the requirement.
It should be noted that, when objective noise and subjective noise do not meet the requirements, the windscreen wiper motor needs to be optimized, the windscreen wiper motor is optimized including the optimization of the structure of the windscreen wiper motor body or the optimization of the rotating speed in the running process of the windscreen wiper motor, for example, when the windscreen wiper motor runs on the whole car, the motor rotating speed corresponding to resonance which should be avoided is switched when the windscreen wiper motor runs on the whole car, so that the resonance phenomenon occurs when the windscreen wiper motor runs on the whole car, and the customer experience is affected.
Table 1 subjective noise level criterion for wiper motor
In summary, the noise testing rack of the wiper motor is built in the silencing room to subjectively and objectively test the noise of the wiper motor body, so that noise interference signals generated by the wiper and other parts of the whole automobile can be avoided, and the noise performance of the wiper motor body can be objectively evaluated; the objective test comprises an air noise test and a structural noise test, so that the noise performance of the wiper motor body can be evaluated more objectively and comprehensively, whether the difference between the air noise and the noise of the noise elimination chamber is larger than a second preset noise value or not is judged, the situation that the tested wiper motor body is inaccurate due to overlarge environmental noise of the noise elimination chamber can be avoided, and the subjective noise evaluation is combined, so that the noise performance of the wiper motor body is evaluated through multi-dimensional analysis, and the noise performance of the wiper motor body is evaluated more comprehensively. And through setting up the wiper motor noise test rack, adopt noise appearance and vibration acceleration sensor to measure the air noise and the structural noise of wiper motor body simultaneously respectively, the wiper motor after will cooling moves on wiper motor noise test rack for subjective evaluation personnel carries out the subjective judgement of noise, makes wiper motor body noise objective test and subjective test based on unified test method, thereby realizes more objectively and more comprehensively evaluating wiper motor body's noise performance, fully knows motor performance.
Example 2
Referring to fig. 3, the present invention provides a wiper motor noise testing system, which specifically includes:
the building module is used for building a wiper motor noise test bench in the silencing room;
the subjective test module is used for carrying out subjective noise test on the wiper motor;
the objective testing module is used for carrying out objective noise testing on the wiper motor; the objective noise test of the wiper motor comprises an air noise test of the wiper motor and a structural noise test of the wiper motor;
when the air noise test of the wiper motor is carried out, measuring and recording the air noise emitted by the wiper motor in the running process; when the structural noise test of the wiper motor is carried out, the structural noise emitted in the running process of the wiper motor is measured and recorded;
the first evaluation module is used for evaluating whether subjective noise meets the requirement;
the second evaluation module is used for evaluating whether the air noise and the structural noise meet the requirements;
wherein, the wiper motor is the front wiper motor and the back wiper motor without the crank.
Optionally, the building module shown is specifically for:
the wiper motor is vertically suspended in a silencing chamber, and the noise level of the silencing chamber is smaller than a first preset noise value; the wiper motor is vertically suspended on the top wall of the anechoic chamber through an elastic rope, and the elastic suspension resonance frequency of the wiper motor and the elastic rope is less than 2Hz, so that the rigid body mode frequency is ensured to be less than the elastic mode frequency by more than 10%;
The wiring terminal of the wiper motor is connected with an external power supply through a wire.
Optionally, the subjective test module specifically includes:
the preparation unit is used for placing the wiper motor in a low-temperature box at the temperature of minus 40 ℃ for at least 4 hours until the temperature of the wiper motor is kept stable; vertically suspending the cooled wiper motor in a sound-deadening chamber, and applying 13.3-13.7V voltage to a wiring terminal of the wiper motor;
the operation unit is used for sequentially selecting a high-speed gear and a low-speed gear, carrying out idle operation on the front wiper motor and the rear wiper motor, and continuously reducing the voltage applied at the connecting terminal in preset time to cover the rotating speed range of the wiper motor;
the observation unit is used for observing whether resonance phenomenon occurs in the wiper motor in the deceleration process and recording the voltage range in which the resonance phenomenon occurs to obtain a target voltage range; and subjective evaluation staff performs subjective evaluation on the noise according to the specific expression of the heard noise.
Optionally, the operation unit is specifically configured to:
continuously reducing the voltage applied at the connecting terminal with a first interval voltage to cover the rotating speed range of the wiper motor;
when the phenomenon that the wiper motor resonates during the deceleration process is observed, the voltage applied to the connecting terminal is continuously reduced by a second interval voltage, wherein the second interval voltage is smaller than the first interval voltage.
Optionally, the objective test module is specifically configured to:
the method comprises the steps that noise meters are respectively arranged right above the rear surfaces of a wiper motor gear box and a vehicle body mounting surface, right above the axis of a wiper motor and perpendicular to the wiper motor gear box and the vehicle body mounting surface and right behind the tail of the wiper motor along the axis of the wiper motor, and the noise meters in all directions are separated from the wiper motor by preset distances;
a vibration acceleration sensor is arranged on a front wiper motor gear box shell or at the output end of a rear wiper motor gear box;
the noise instrument and the vibration acceleration sensor are connected with the collector through data lines;
applying 13.3-13.7V voltage at a connecting terminal of the wiper motor;
sequentially selecting a front wiper motor for idle running of a high-speed gear and a low-speed gear, wherein the running time of the front wiper motor and the rear wiper motor is not more than 10 minutes after idle running;
each noise instrument respectively measures air noise in the running process of the wiper motor;
the vibration acceleration sensor measures structural noise in the running process of the wiper motor;
the collector screens air noise in the frequency range of 0.1-10KHz, uses a filter to record the noise value corresponding to 1/3 frequency multiplication air noise in the frequency range of 0.1-10KHz, and averages the noise values measured by each noise instrument for multiple times;
The collector screens the structural noise in the frequency range of 0.1-10KHz and calibrates the weight acceleration to 9.81 m/s 2 And recording a noise value corresponding to the 1/3 frequency multiplication structure noise by using a filter within the frequency range of 0.1-10KHz, and averaging the noise values measured by the vibration acceleration sensor for multiple times.
Optionally, the objective test module is further specifically configured to:
applying the target voltage range at a second interval voltage at a connection terminal of the wiper motor;
each noise instrument respectively measures air noise in the running process of the wiper motor;
the vibration acceleration sensor measures structural noise in the running process of the wiper motor;
the collector acquires a noise-frequency curve obtained by measurement;
and screening out a noise maximum value corresponding to the target voltage range, finding out a corresponding frequency according to the noise maximum value, and calculating the corresponding motor rotating speed through frequency conversion.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the invention.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
It will be apparent that the described embodiments are only some, but not all, embodiments of the application. Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application for the embodiment. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Claims (3)
1. The method for testing the noise of the wiper motor is characterized by comprising the following steps of:
a wiper motor noise test bench is built in the anechoic room;
subjective noise testing of the wiper motor is conducted;
objective noise testing of the wiper motor is carried out;
the objective noise test of the wiper motor comprises an air noise test of the wiper motor and a structural noise test of the wiper motor;
when the air noise test of the wiper motor is carried out, measuring and recording the air noise emitted by the wiper motor in the running process; when the structural noise test of the wiper motor is carried out, the structural noise emitted in the running process of the wiper motor is measured and recorded;
evaluating whether subjective noise meets the requirement;
evaluating whether the air noise and the structural noise meet the requirements;
wherein the wiper motor is a front wiper motor and a rear wiper motor without a crank;
the step of building the wiper motor noise test bench in the anechoic room specifically comprises the following steps:
the wiper motor is vertically suspended in a silencing chamber, and the noise level of the silencing chamber is smaller than a first preset noise value; the wiper motor is vertically suspended on the top wall of the anechoic chamber through an elastic rope, and the elastic suspension resonance frequency of the wiper motor and the elastic rope is less than 2Hz, so that the rigid body mode frequency is ensured to be less than the elastic mode frequency by more than 10%;
The wiring end of the wiper motor is connected with an external power supply through a wire;
the step of carrying out subjective noise test of the wiper motor specifically comprises the following steps:
placing the wiper motor in a low-temperature box at the temperature of minus 40 ℃ for at least 4 hours until the temperature of the wiper motor is kept stable;
vertically suspending the cooled wiper motor in a sound-deadening chamber, and applying 13.3-13.7V voltage to a wiring terminal of the wiper motor;
sequentially selecting a high-speed gear and a low-speed gear, carrying out no-load operation on the front wiper motor, carrying out no-load operation on the rear wiper motor, and continuously reducing the voltage applied at the connecting terminal in preset time to cover the rotating speed range of the wiper motor;
observing whether resonance phenomenon occurs in the wiper motor in the deceleration process, and recording the voltage range in which the resonance phenomenon occurs to obtain a target voltage range;
subjective evaluation personnel perform subjective evaluation on the noise according to the specific performance of the heard noise;
the step of carrying out objective noise test of the wiper motor further comprises the following steps:
continuously reducing the voltage at the connecting terminal at a second interval voltage at the connecting terminal of the wiper motor, wherein the voltage is within a target voltage range;
each noise instrument respectively measures air noise in the running process of the wiper motor;
The vibration acceleration sensor measures structural noise in the running process of the wiper motor;
the collector acquires a noise-frequency curve obtained by measurement;
the collector screens out a noise maximum value corresponding to the target voltage range, finds out a corresponding frequency according to the noise maximum value, and calculates a corresponding motor rotating speed through frequency conversion;
the step of continuously reducing the voltage applied at the connecting terminal in the preset time to cover the rotating speed range of the wiper motor specifically comprises the following steps:
firstly, continuously reducing the voltage applied at the connecting terminal with a first interval voltage to cover the rotating speed range of the wiper motor;
when the phenomenon that the wiper motor resonates in the speed reducing process is observed, continuously reducing the voltage applied to the connecting terminal by using a second interval voltage, wherein the second interval voltage is smaller than the first interval voltage;
the step of carrying out objective noise test of the wiper motor specifically comprises the following steps:
the method comprises the steps that noise meters are respectively arranged right above the rear surfaces of a wiper motor gear box and a vehicle body mounting surface, right above the axis of a wiper motor and perpendicular to the wiper motor gear box and the vehicle body mounting surface and right behind the tail of the wiper motor along the axis of the wiper motor, and the noise meters in all directions are separated from the wiper motor by preset distances;
A vibration acceleration sensor is arranged on a front wiper motor gear box shell or at the output end of a rear wiper motor gear box;
the noise instrument and the vibration acceleration sensor are connected with the collector through data lines;
applying 13.3-13.7V voltage at a connecting terminal of the wiper motor;
sequentially selecting a front wiper motor for idle running of a high-speed gear and a low-speed gear, wherein the running time of the front wiper motor and the rear wiper motor is not more than 10 minutes after idle running;
each noise instrument respectively measures air noise in the running process of the wiper motor;
the vibration acceleration sensor measures structural noise in the running process of the wiper motor;
the collector screens air noise in the frequency range of 0.1-10KHz, uses a filter to record the noise value corresponding to 1/3 frequency multiplication air noise in the frequency range of 0.1-10KHz, and averages the noise values measured by each noise instrument for multiple times;
the collector screens the structural noise in the frequency range of 0.1-10KHz and calibrates the weight acceleration to 9.81 m/s 2 Recording a noise value corresponding to 1/3 frequency multiplication structure noise by using a filter in a frequency range of 0.1-10KHz, and averaging the noise values measured by the vibration acceleration sensor for multiple times;
The step of evaluating whether the air noise and the structural noise meet the requirements specifically comprises the following steps:
evaluating whether the maximum noise value measured by each noise instrument of the front wiper motor is smaller than a third preset noise value when the front wiper motor operates in a high-speed gear and a low-speed gear within the frequency range of 0.1-2 KHz;
evaluating whether the maximum noise value measured by each noise instrument of the front wiper motor is smaller than a fourth preset noise value when the front wiper motor operates in a high-speed gear and a low-speed gear within the frequency range of 2-10 KHz;
evaluating whether the maximum noise value measured by each noise instrument is smaller than a fifth preset noise value when the rear wiper motor operates within the frequency range of 0.1-10 KHz;
evaluating whether the maximum noise value measured by the vibration acceleration sensor of the front wiper motor is smaller than a sixth preset noise value when the front wiper motor operates in a high-speed gear and a low-speed gear within the frequency range of 0.1-0.4 KHz;
evaluating whether the maximum noise value measured by the vibration acceleration sensor of the front wiper motor is smaller than a seventh preset noise value when the front wiper motor operates in a high-speed gear and a low-speed gear within the frequency range of 0.4-10 KHz;
evaluating whether the maximum noise value measured by the vibration acceleration sensor of the rear wiper motor is smaller than an eighth preset noise value when the rear wiper motor operates within the frequency range of 0.1-0.4 KHz;
Evaluating whether the maximum noise value measured by the vibration acceleration sensor of the rear wiper motor is smaller than a ninth preset noise value when the rear wiper motor runs within the frequency range of 0.4-10 KHz;
the step of evaluating whether subjective noise meets the requirement specifically includes:
when the noise heard by the subjective evaluator is embodied as noiseless, the subjective evaluator is rated as high, and the corresponding rating is rated as 10;
when the noise heard by the subjective evaluator is particularly detected by sound, the subjective evaluator is very good, and the corresponding grade is 9;
when the noise heard by the subjective evaluator is embodied as only reverse noise, the subjective evaluator is good, and the corresponding grading grade is 8 grade;
when the noise heard by the subjective evaluator is embodied as reverse noise and higher decibel squeak, the subjective evaluator is generally judged, and the corresponding grade is grade 7;
when the noise heard by the subjective evaluator is embodied as slightly low-decibel scraping noise, the subjective evaluator is judged to be in a critical state, and the corresponding grading grade is grade 6;
when the noise heard by the subjective evaluator is embodied as slight shake and moderate scratch, the subjective evaluator is judged to be in a critical state, and the corresponding grading grade is 5;
When the noise heard by the subjective evaluator is embodied as moderate and strong scraping noise, the subjective evaluator is judged to be bad, and the corresponding grade is grade 4;
when the noise heard by the subjective evaluator is embodied as strong shaking and strong scraping noise, the subjective evaluator is judged to be bad, and the corresponding grading grade is grade 3;
wherein the grading grade is above 6 grades, and subjective noise meets the requirements.
2. The method for testing the noise of the wiper motor according to claim 1, wherein the collector is siemens vibration noise performance testing equipment, and the model of the collector is SCR2E05.
3. The test system of the wiper motor noise test method according to claim 1, specifically comprising:
the building module is used for building a wiper motor noise test bench in the silencing room;
the subjective test module is used for carrying out subjective noise test on the wiper motor;
the objective testing module is used for carrying out objective noise testing on the wiper motor; the objective noise test of the wiper motor comprises an air noise test of the wiper motor and a structural noise test of the wiper motor;
when the air noise test of the wiper motor is carried out, measuring and recording the air noise emitted by the wiper motor in the running process; when the structural noise test of the wiper motor is carried out, the structural noise emitted in the running process of the wiper motor is measured and recorded;
The method comprises the steps of continuously reducing the voltage at the connecting terminal at a second interval voltage at the connecting terminal of the wiper motor, wherein the voltage is in a target voltage range;
each noise instrument respectively measures air noise in the running process of the wiper motor;
the vibration acceleration sensor measures structural noise in the running process of the wiper motor;
the collector acquires a noise-frequency curve obtained by measurement;
the collector screens out a noise maximum value corresponding to the target voltage range, finds out a corresponding frequency according to the noise maximum value, and calculates a corresponding motor rotating speed through frequency conversion;
the first evaluation module is used for evaluating whether subjective noise meets the requirement;
the second evaluation module is used for evaluating whether the air noise and the structural noise meet the requirements;
wherein the wiper motor is a front wiper motor and a rear wiper motor without a crank;
the building module shown is specifically for:
the wiper motor is vertically suspended in a silencing chamber, and the noise level of the silencing chamber is smaller than a first preset noise value; the wiper motor is vertically suspended on the top wall of the anechoic chamber through an elastic rope, and the elastic suspension resonance frequency of the wiper motor and the elastic rope is less than 2Hz, so that the rigid body mode frequency is ensured to be less than the elastic mode frequency by more than 10%;
The wiring end of the wiper motor is connected with an external power supply through a wire;
the subjective test module specifically comprises:
the preparation unit is used for placing the wiper motor in a low-temperature box at the temperature of minus 40 ℃ for at least 4 hours until the temperature of the wiper motor is kept stable; vertically suspending the cooled wiper motor in a sound-deadening chamber, and applying 13.3-13.7V voltage to a wiring terminal of the wiper motor;
the operation unit is used for sequentially selecting a high-speed gear and a low-speed gear, carrying out idle operation on the front wiper motor and the rear wiper motor, and continuously reducing the voltage applied at the connecting terminal in preset time to cover the rotating speed range of the wiper motor;
the observation unit is used for observing whether resonance phenomenon occurs in the wiper motor in the deceleration process and recording the voltage range in which the resonance phenomenon occurs to obtain a target voltage range; and subjective evaluation staff performs subjective evaluation on the noise according to the specific expression of the heard noise.
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| CN116429245A (en) | 2023-07-14 |
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