CN115455679A - Windscreen wiper motor noise improvement analysis method - Google Patents
Windscreen wiper motor noise improvement analysis method Download PDFInfo
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- CN115455679A CN115455679A CN202211055757.1A CN202211055757A CN115455679A CN 115455679 A CN115455679 A CN 115455679A CN 202211055757 A CN202211055757 A CN 202211055757A CN 115455679 A CN115455679 A CN 115455679A
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Abstract
The invention discloses a wiper motor noise improvement analysis method. The method includes setting a noise performance target for a target location within a vehicle cabin; on a trial-manufactured vehicle, measuring whether the noise loudness of the wiper motor at the target position meets the performance target requirement, if so, ending the method, and if not, entering the next step; establishing a structural transfer path and an air transfer path for transferring the noise of the wiper motor to the target position; measuring and calculating the transmission rate of a key transmission structure on the structure transmission path, and measuring the noise loudness of the wiper motor transmitted to the target position through the air transmission path; and optimally designing according to the transfer rate of a key transfer structure and the noise loudness of the wiper motor transferred to the target position by the air transfer path. According to the measurement and analysis of the trial-manufactured vehicle, whether the continuous wiper motor meets the noise requirement is verified, a targeted optimization design flow is provided for improvement, and the noise of the wiper motor in the vehicle cabin is reduced.
Description
Technical Field
The invention relates to the technical field of vehicle design, in particular to a method for improving and analyzing the noise of a wiper motor.
Background
The noise in the car cabin, i.e. the noise in the car, is mainly composed of the noise of mechanical components such as an engine (engine noise), the friction sound (road noise) between tires and the ground, the collision and friction sound (wind noise) generated when the car breaks through an air curtain, the sound (such as the sound of whistling by a large container car) transmitted into the car from the external environment, the internal noise generated by the vibration of parts such as a decorative plate in the cockpit, and the like. Most of these noises are transmitted from outside the vehicle cabin to inside the cabin.
At present, in the automobile design stage, the wiper motors for automobiles are mostly used continuously platform pieces, and due to the fact that certain differences exist in the structural sizes of all types of automobile, the wiper motors lack an effective analysis and optimization method once being selected, noise transmitted to passenger cabins by the used wiper motors cannot be effectively evaluated and verified, and certain risks of complaining of passengers exist.
Disclosure of Invention
The invention aims to provide a windscreen wiper motor noise improvement analysis method, which establishes a flow of windscreen wiper motor noise analysis in a trial-manufacture stage and improves the sound quality and comfort in a vehicle cabin.
In order to solve the technical problem, the invention provides a wiper motor noise improvement analysis method, which comprises the following steps:
the method comprises the following steps: setting a noise performance target of a target position in a vehicle cabin;
step two: on a trial-manufactured vehicle, measuring whether the noise loudness of the wiper motor at the target position meets the performance target requirement, if so, ending the method, and if not, entering a third step;
step three: establishing a transfer path for the wiper motor noise to the target location, wherein the transfer path comprises a structural transfer path and an air transfer path;
step four: measuring and calculating the transmission rate of a key transmission structure on the structure transmission path, and measuring the noise loudness of the wiper motor transmitted to the target position through the air transmission path;
step five; and optimally designing according to the transfer rate of a key transfer structure and the noise loudness of the wiper motor transferred to the target position by the air transfer path.
In the method for analyzing the noise improvement of the wiper motor, real-vehicle measurement is carried out on a trial-manufactured vehicle, the transmission path of the wiper motor noise is divided into the structure transmission path and the air transmission path, and the key structure transmission rate on the structure transmission path and the sound intensity transmitted by the air transmission path are respectively measured and calculated, so that the reason that the noise loudness of the wiper motor does not meet the performance requirement is quickly positioned, targeted optimization is carried out, the wiper motor noise in a vehicle cabin is reduced, and the riding comfort is improved.
Preferably, the key transmission structure is a mounting structure directly connected with the wiper motor. Because the structure transmission depends on an actual mounting structure, the mounting structure directly connected with the wiper motor is analyzed, and the noise performance of a target position caused by a transmission path of the positioning structure can be quickly poor.
As an improvement of the method for analyzing the noise improvement of the wiper motor, in step four, the method for measuring and calculating the transmission rate of the key transmission structure on the transmission path of the structure comprises the following steps:
starting a wiper motor on a trial-manufactured vehicle;
respectively collecting vibration amplitudes at the input end and the output end of the key transmission structure to be detected along the structure transmission path;
and calculating the corresponding transfer rate according to the input end vibration amplitude and the output end vibration amplitude of each key transfer structure.
The transfer rate of the key transfer structure is measured and calculated, the attenuation capacity of the corresponding mounting structure to the noise conduction process of the wiper motor is obtained, quantification is carried out, and therefore noise can be reduced by optimizing the key performance structure.
Further, the calculating the corresponding transfer rate according to the input end vibration amplitude and the output end vibration amplitude of each key transfer structure includes:
and dividing the vibration amplitude of the output end by the vibration amplitude of the input end to obtain the transmissibility of the corresponding key transmission structure.
As another improvement of the wiper motor noise improvement analyzing method of the present invention, in the second step, in the fourth step, the method of measuring the loudness of the wiper motor noise transmitted to the target position through the air transfer path includes the steps of:
arranging a noise generator at the installation position of the wiper motor to simulate the sound of the wiper motor, wherein the noise generator is not in contact with a vehicle;
and arranging a sound collector at the target position to collect response sound.
The noise generator is not contacted with the vehicle structure, so that the residual amount of the noise of the wiper motor when the noise is transmitted to the target position through the vehicle body gap is obtained, and whether the noise volume of the wiper motor is qualified or not is judged due to the fact that the vehicle body gap is fixed, and subsequent judgment and optimization are facilitated.
As a further improvement of the method for analyzing the noise improvement of the wiper motor of the present invention, in the fifth step, the optimal design is preferentially performed according to the transmission rate of the key transmission structure, and then the optimal design is performed according to the loudness of the noise of the wiper motor transmitted to the target position by the air transmission path,
and when the optimal design is carried out according to the transmission rate of the key transmission structures, after each pair of key transmission structures are subjected to the optimal design, measuring whether the noise loudness of the wiper motor at the target position meets the performance target requirement, if so, ending the method, and if not, continuing to optimize the next key transmission structure until all the key transmission structures needing to be optimized are completely optimized.
According to the transmission path of the wiper noise, the installation parts on the periphery of the wiper motor which can be optimized are located on the structure transmission path firstly, optimization design is carried out, whether the wiper motor needs optimization design or not is determined from the air transmission path, the noise loudness of the wiper motor at a target position is measured after the optimization design is completed every time, the wiper motor stops when the requirements are met, and the purpose of reducing the noise of the wiper motor in a vehicle cabin is finally achieved. Because the wiper motor is a rim piece, and the motor model generally has a standard series, peripheral installation pieces of the wiper motor, such as a wiper motor suspension, a wiper motor connecting rod and the like, are preferentially and optimally designed, so that the cost is saved, the structural optimization is also easy, and the optimal design process is simple.
As another improvement of the method for analyzing noise improvement of wiper motor of the present invention, the key transmission structure includes: wiper motor suspension and wiper motor connecting rod.
Further, in step five, the optimization design according to the transmission rate of the key transmission structure includes:
if the transfer rate of the wiper motor suspension is more than 70%, reducing the hardness of the wiper motor suspension;
or if the transmissibility of the wiper motor connecting rod is greater than 98%, the rigidity of the wiper motor connecting rod is reduced.
Whether the key transmission structure is appropriate or not is judged by combining the specific transmission rate of the key transmission structure with empirical data or test calibration data, optimization is carried out when the key transmission structure is not appropriate, and the optimization design for reducing the noise of the wiper motor is carried out from peripheral parts of the wiper motor.
As another improvement of the method for analyzing noise improvement of a wiper motor according to the present invention, in the fifth step, the optimizing the noise loudness of the wiper motor transmitted to the target position by the air transmission path includes:
when the noise frequency of the wiper motor is as follows: 100Hz-700Hz or 1300Hz-5000Hz, and the noise loudness of the wiper motor at the target position is more than 5dB, or the noise frequency of the wiper motor is as follows: and when the noise loudness of the wiper motor at the target position is larger than 3dB, optimally designing the wiper motor.
Furthermore, the surface roughness of the commutator of the wiper motor is improved, the using amount of a lubricant of a carbon brush of the wiper motor is increased, the type of a transmission mechanism of the wiper motor is replaced, or the set rotating speed of the wiper motor is reduced. Preferably, the type of wiper motor drive is changed from a primary speed reducer to a secondary speed reducer.
After the self noise of the wiper motor is too large, the adjustment of the noise of the wiper motor can be realized through the adjustment of the self parameters of the wiper motor.
In conclusion, by adopting the windscreen wiper motor noise improvement analysis method, a windscreen wiper motor noise transmission theory, an actual analysis, measurement, analysis process and a coping method are summarized, when a platform windscreen wiper motor is used in a newly designed vehicle type, the windscreen wiper motor noise in a vehicle cabin can be actually measured and analyzed, the targeted optimization design improvement can be carried out on the vehicles which do not meet the noise performance target, the optimization process is simple and rapid, the in-vehicle noise caused by the windscreen wiper motor is effectively reduced, the noise performance index is reduced, and the comfort of the vehicle cabin is improved.
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In the drawings:
fig. 1 is a flow chart of a wiper motor noise improvement analysis method according to the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.
Example 1
As shown in fig. 1, the method for analyzing the noise improvement of the wiper motor of the present invention comprises the following steps:
step S10: a noise performance target is set for a target location within a vehicle cabin.
Optionally, the target position is 700mm directly above the R point of the driving seat and 1350mm away from the brake pedal. Combining the subjective evaluation of the market on the standard vehicle and the whole vehicle, setting the noise performance index of a target position in a passenger compartment of the vehicle to be greater than R7.0, and designing the noise objective quality parameter requirement: the loudness is less than or equal to 57dB, the sharpness is less than or equal to 1.5Acum, and the roughness is less than or equal to 4Asper.
Step S20: and on the trial-manufactured vehicle, measuring whether the noise loudness of the wiper motor at the target position meets the performance target requirement, if so, ending the method, and if not, entering the step S30. The specific measurement method comprises the following steps:
1. starting a wiper motor on a trial-manufactured vehicle;
2. and arranging a sound collector at the target position to collect response sound. Note that during the measurement, the window is in a closed state.
Step S30: establishing a transfer path for the wiper motor noise to the target location, wherein the transfer path comprises a structural transfer path and an air transfer path. Different motorcycle types, the windscreen wiper motor mounting structure of vehicle is similar, and transmission path is similar, but specific structure is different again, and general structure transmission path is: the method comprises the following steps of (1) suspending a wiper motor → suspending the wiper motor → mounting a bracket of the wiper motor → a bracket connecting main body sheet metal → a target position, and (ii) connecting the wiper motor → a connecting rod of the wiper motor → a front wind pole → an instrument desk → the target position; the air transfer path is: wiper motor → body aperture → target location.
Step S40: and measuring and calculating the transmission rate of a key transmission structure on the structure transmission path, and measuring the noise loudness of the wiper motor transmitted to the target position through the air transmission path.
1. The method for measuring and calculating the transmission rate of the key transmission structure on the transmission path of the structure comprises the following steps:
(1) and starting a wiper motor on a trial-manufactured vehicle, and keeping a vehicle window in a closed state.
(2) And respectively collecting vibration amplitudes at the input end and the output end of the key transmission structure to be detected along the structure transmission path. The critical transfer structure includes: the windscreen wiper motor suspension and the windscreen wiper motor connecting rod are connected, wherein the connecting part of the windscreen wiper motor suspension and the windscreen wiper motor is an input end, and the connecting part of the windscreen wiper motor suspension and a windscreen wiper motor mounting point support is an output end; the input end of the connecting rod of the wiper motor is a rotating shaft connected with the wiper motor, and the output end of the connecting rod of the wiper motor is a part connected with the wiper rod. A sensor may be employed for vibration detection.
(3) Calculating the corresponding transfer rate according to the input end vibration amplitude and the output end vibration amplitude of each key transfer structure, and adopting: and dividing the vibration amplitude of the output end by the vibration amplitude of the input end to obtain the transmissibility corresponding to the key transmission structure.
2. The method of measuring the loudness of the wiper motor noise transmitted through the air transfer path to the target location includes the steps of:
(1) the noise generator is arranged at the mounting position of the wiper motor, the sound of the wiper motor is simulated, the noise generator is not in contact with a vehicle body structure, and the influence of structure transmission is reduced.
(2) And arranging a sound collector at the target position to collect response sound.
Step S50: and optimally designing according to the transfer rate of a key transfer structure and the noise loudness of the wiper motor transferred to the target position by the air transfer path.
Optionally, the optimization design is preferentially performed according to the transfer rate of the key transfer structure, then the optimization design is performed according to the noise loudness of the wiper motor transferred to the target position by the air transfer path, and when the optimization design is performed according to the transfer rate of the key transfer structure, after each pair of key transfer structures are optimized, whether the noise loudness of the wiper motor at the target position meets the performance target requirement is measured, if yes, the method is ended, if not, the next key transfer structure is continuously optimized until all the key transfer structures needing to be optimized are completely optimized, so that the optimization process is rapid and efficient.
1. The optimization design according to the transmission rate of the key transmission structure comprises the following steps:
if the transfer rate of the wiper motor suspension is more than 70%, reducing the hardness of the wiper motor suspension; or if the transmissibility of the wiper motor connecting rod is greater than 98%, the rigidity of the wiper motor connecting rod is reduced. And if the sorting is carried out, the hardness optimization design of the wiper motor suspension can be preferentially carried out, the optimization is simple, and the effect of better reducing the noise of the wiper motor transmitted into the vehicle cabin is achieved. The hardness optimization of the wiper motor suspension can be set as 65Hs → 55Hs → 45Hs → 40Hs in sequence, and the vibration is improved by about 20% when the hardness is reduced by about 10Hs for one step, but the durability needs to be considered, and Hs is Shore hardness.
2. In the optimization design according to the noise loudness of the wiper motor transferred to the target position by the air transfer path, the precondition required to be optimized is as follows:
(1) the noise frequency of the wiper motor is as follows: 100Hz-700Hz or 1300Hz-5000Hz, and the noise loudness of the wiper motor at the target position is more than 5dB;
(2) the noise frequency of the wiper motor is as follows: 700Hz-1300Hz, and the noise loudness of the wiper motor at the target position is more than 3 dB. If only one is satisfied, the motor of the wiper motor needs to be optimally designed.
Optionally, the specific available method for optimally designing the wiper motor is as follows:
(1) the surface roughness of the commutator of the wiper motor is improved, usually 0-8um is changed into 0-4um, and the noise loudness is reduced by about 3dB;
(2) increasing the using amount of the lubricant for the wiper motor carbon brush, for example, increasing the lubricant by 1.2g from 0.6g, reducing the noise loudness by about 1.5dB, and paying attention to the need of synchronously confirming the electromagnetic compatibility risk;
(3) the type of the transmission mechanism of the wiper motor is changed, the first-stage speed reduction is replaced by a second-stage speed reducer, and the noise roughness is improved by about 1Asper;
(4) the set rotating speed of the wiper motor can be set to 70rpm → 65rpm → 60rpm → 55rpm, and 1.2dB noise loudness reduction can be realized by reducing 10rpm, but the rotating speed regulation requirements of high gear and low gear need to be paid attention.
During the use, according to the transfer path of windscreen wiper noise, fix a position windscreen wiper motor peripheral installed part that can optimize from the structure transfer path earlier, carry out optimal design, confirm whether windscreen wiper motor self needs optimal design from the air transfer path again, all carry out the windscreen wiper motor noise loudness measurement of a target location after the optimal design is accomplished at every turn, satisfy the requirement and stop promptly, finally reach the purpose of reducing the windscreen wiper motor noise in the vehicle cabin.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the scope of protection thereof, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: after reading this disclosure, those skilled in the art will be able to make various changes, modifications and equivalents to the embodiments of the invention, which fall within the scope of the appended claims.
Claims (10)
1. A method for improving and analyzing the noise of a wiper motor is characterized by comprising the following steps:
the method comprises the following steps: setting a noise performance target of a target position in a vehicle cabin;
step two: on a trial-manufactured vehicle, measuring whether the noise loudness of the wiper motor at the target position meets the performance target requirement, if so, ending the method, and if not, entering a third step;
step three: establishing a transfer path for the wiper motor noise to the target location, wherein the transfer path comprises a structural transfer path and an air transfer path;
step four: measuring and calculating the transmission rate of a key transmission structure on the structure transmission path, and measuring the noise loudness of the wiper motor transmitted to the target position through the air transmission path;
step five: and optimally designing according to the transmission rate of a key transmission structure and the noise loudness of the wiper motor transmitted to the target position by the air transmission path.
2. The wiper motor noise improvement analysis method according to claim 1, wherein in step four, the method of measuring and calculating the transmissibility of the critical transmission structure on the structure transmission path comprises the steps of:
starting a wiper motor on a trial-manufactured vehicle;
respectively collecting vibration amplitudes at the input end and the output end of the key transmission structure to be detected along the structure transmission path;
and calculating the corresponding transfer rate according to the input end vibration amplitude and the output end vibration amplitude of each key transfer structure.
3. The wiper motor noise improvement analysis method of claim 2, wherein said calculating a corresponding transfer rate from the input and output vibration amplitudes of each critical transfer structure comprises:
and dividing the vibration amplitude of the output end by the vibration amplitude of the input end to obtain the transmissibility of the corresponding key transmission structure.
4. The wiper motor noise improvement analysis method according to claim 1, wherein in step four, the method of measuring the loudness of the wiper motor noise transmitted to the target location through the air transfer path comprises the steps of:
arranging a noise generator at the installation position of the wiper motor to simulate the sound of the wiper motor;
and arranging a sound collector at the target position to collect response sound.
5. The method of claim 1, wherein in step five, the optimization design is performed according to the transmission rate of the key transmission structure and the noise loudness of the wiper motor transmitted to the target position by the air transmission path,
and when the optimal design is carried out according to the transmission rate of the key transmission structures, after each pair of key transmission structures are subjected to the optimal design, measuring whether the noise loudness of the wiper motor at the target position meets the performance target requirement, if so, ending the method, and if not, continuously optimizing the next key transmission structure until all the key transmission structures needing to be optimized are completely optimized.
6. The wiper motor noise improvement analysis method of claim 1, wherein the critical transfer structure comprises: wiper motor suspension and wiper motor connecting rod, in step five, carry out optimal design according to key transmission structure's transmissibility and include:
if the transfer rate of the wiper motor suspension is more than 70%, reducing the hardness of the wiper motor suspension;
or if the transmissibility of the wiper motor connecting rod is greater than 98%, the rigidity of the wiper motor connecting rod is reduced.
7. The wiper motor noise improvement analysis method according to claim 1, wherein in step five, the optimization design according to the noise loudness of the wiper motor transferred to the target position by the air transfer path comprises:
when the noise frequency of the wiper motor is as follows: 100Hz-700Hz or 1300Hz-5000Hz, and the noise loudness of the wiper motor at the target position is more than 5dB, or the noise frequency of the wiper motor is as follows: and when the noise loudness of the wiper motor at the target position is more than 3dB, the wiper motor is optimally designed.
8. The wiper motor noise improvement analysis method according to claim 1 or 7, wherein in step five, the optimization design according to the loudness of the wiper motor noise transferred to the target position by the air transfer path comprises:
the surface roughness of the commutator of the wiper motor is improved, the use amount of a lubricant of a carbon brush of the wiper motor is increased, the type of a transmission mechanism of the wiper motor is replaced or the set rotating speed of the wiper motor is reduced.
9. The wiper motor noise improvement analysis method according to claim 1, wherein the target position is a point 700mm directly above the R point of the driving seat and 1350mm away from the brake pedal.
10. The wiper motor noise improvement analysis method according to claim 1, wherein the performance targets are: the loudness is less than or equal to 57dB, the sharpness is less than or equal to 1.5Acum, and the roughness is less than or equal to 4Aspe.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116429245A (en) * | 2023-06-13 | 2023-07-14 | 江铃汽车股份有限公司 | Method and system for testing noise of wiper motor |
| CN116522669A (en) * | 2023-05-17 | 2023-08-01 | 安徽江淮汽车集团股份有限公司 | Automobile windscreen wiper wind noise performance evaluation method and evaluation tool |
-
2022
- 2022-08-31 CN CN202211055757.1A patent/CN115455679A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116522669A (en) * | 2023-05-17 | 2023-08-01 | 安徽江淮汽车集团股份有限公司 | Automobile windscreen wiper wind noise performance evaluation method and evaluation tool |
| CN116429245A (en) * | 2023-06-13 | 2023-07-14 | 江铃汽车股份有限公司 | Method and system for testing noise of wiper motor |
| CN116429245B (en) * | 2023-06-13 | 2023-09-01 | 江铃汽车股份有限公司 | Method and system for testing noise of wiper motor |
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