CN104697786A - Objective evaluation method of transmission whine noise - Google Patents
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Abstract
The invention discloses an objective evaluation method of transmission whine noise. The objective evaluation method of the transmission whine noise comprises the following steps: slicing a one-third octave spectrogram of a vehicle interior noise based on a transmission whine order to obtain a sound pressure level curve; calculating a difference between the obtained sound pressure level curve and the sound pressure level curve of the transmission whine order; using the obtained differential curve as an objective evaluation index for the transmission whine; finally, comparing the index with a qualified line to obtain an objective evaluation conclusion. The objective evaluation method of the transmission whine noise uses the parameterized evaluation index for objectively and precisely evaluating the subjective feeling of people to the transmission whine noise. Meanwhile, the objective evaluation method of the transmission whine noise is convenient in use, and high in practicality.
Description
Technical field
The invention belongs to auto NVH (Noise Vibration Harshness, noise and vibration and uneven compliance) field, be specifically related to a kind of new work transmission whistler method for objectively evaluating.
Background technology
Along with the requirement of market user to automotive quality is more and more harsh, the lifting of auto NVH performance seems more important.The optimization of variator whistler is a large difficult point of auto NVH performance boost.In variator whistler optimizing process, how accurately the objective appraisal variator level of uttering long and high-pitched sounds be first need faced by problem.In the conventional method, a kind of is overall sound pressure level and variator are uttered long and high-pitched sounds the difference of order sound pressure level as evaluation index, but the value on the non-frequency domain of this difference, the impact of sound frequency characteristic on people's ear can not be taken into account, thus reduce objective evaluation accuracy.Another kind method variator is uttered long and high-pitched sounds the difference of order sound pressure level and its ground unrest as evaluation index, but the computing method of ground unrest are very complicated, and often directly cannot draw analysis result when using professional software to analyze, practicality is low.
Summary of the invention
The object of this invention is to provide a kind of variator whistler method for objectively evaluating, can realize using parameterized evaluation index to carry out objective and accurate measurement people to the subjective feeling of variator whistler, use easy, practicality is high simultaneously.
Variator whistler method for objectively evaluating of the present invention, comprises the following steps:
Step one, test condition prepares: air-conditioning, fan, radio, multimedia system, door, window, air vent are all in closed condition, install noise testing sensor in crew module, and are connected with data acquisition and analytic system by noise testing sensor;
Step 2, test: automobile travels in the even acceleration of each gear or even deceleration art skating, and noise testing sensor gathers the noise data in car;
Step 3, noise data process:
3a, gathered noise data carried out to process and obtain third-octave spectrogram and variator and to utter long and high-pitched sounds order sound pressure level curve;
3b, make order cut into slices and obtain corresponding sound pressure level curve third-octave spectrogram, the order value doing order section is also for variator is uttered long and high-pitched sounds order;
3c, order sound pressure level curve of sound pressure level curve and variator being uttered long and high-pitched sounds are made difference by corresponding rotating speed and are obtained difference curve.
Also comprise step 4, noise rating: by described difference curve and qualified control pair ratio, when difference curve is lower than qualified control line, then the level of uttering long and high-pitched sounds of variator is defective; When difference curve is higher than qualified control line, then the level of uttering long and high-pitched sounds of variator is qualified.
In described step 4, described qualified control line is the straight line of y=5dB.
In test process, the road that vehicle travels should be level and smooth bituminous road or cement road, and road surface is without ponding and foreign material.
Described noise testing sensor is PCB 377B02, totally two, is arranged in front-row seats, back seat place.
The present invention has the following advantages: variator is uttered long and high-pitched sounds order sound pressure level curve and the sound pressure level curve that the section of third-octave spectrogram order is formed all can be converted to curve map on frequency domain by rotating speed territory, its conversion formula is: frequency=rotating speed/60* order, the difference curve of the two is also the curve map in frequency domain, enable during objective evaluation, to take into account the impact of sound frequency characteristic on people's ear, improve the accuracy of objective evaluation, compared with prior art, the present invention is more scientific and reasonable.In addition, the present invention directly uses third-octave spectrogram to make order and to cut into slices the difference calculated as evaluation index, makes data analysis process very easy.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention;
Fig. 2 is the position figure of noise testing sensor in the present invention;
Fig. 3 is operational instances schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Variator whistler method for objectively evaluating as illustrated in figs. 1 and 2, comprises the following steps:
Step one, test condition prepares: air-conditioning, fan, radio, multimedia system, door, window, air vent are all in closed condition, ensures that vehicle tyre pressure is in service manual specialized range.Noise testing sensor is installed in crew module, and noise testing sensor is connected with data acquisition and analytic system.Noise testing sensor adopts PCB 377B02, totally two, is arranged in front-row seats, back seat place, see Fig. 2.
Step 2, test: automobile travels in the even acceleration of each gear or even deceleration art skating, and noise testing sensor gathers the noise data in car.A tachometer gage is needed to gather the revolution of engine, for order analysis while noise data collection.In test process, the road that vehicle travels should be level and smooth bituminous road or cement road, and road surface is without ponding and foreign material (such as: stone), and has enough length for about 5 kilometers of running car.
Step 3, data acquisition and analytic system process noise data, this data acquisition and analytic system have spectrum analysis and order analysis function, and Siemens Company's LMS SCADASM Mobile Front-End data acquisition front and LMS Test.Lab test analysis software can be used to carry out Data acquisition and issuance.Concrete processing procedure is as follows:
3a, use LMS Test.Lab to analyze to gathered noise data to obtain third-octave spectrogram, use LMS Test.Lab to analyze to obtain variator to utter long and high-pitched sounds order sound pressure level curve to gathered noise data.
3b, use LMS Test.Lab to make order to third-octave spectrogram cut into slices and obtain corresponding sound pressure level curve, make order value that order cuts into slices also for variator is uttered long and high-pitched sounds order.
3c, LMS Test.Lab order sound pressure level curve of sound pressure level curve and variator being uttered long and high-pitched sounds is used to do to differ from by corresponding rotating speed and obtain difference curve.
Step 4, noise rating: by described difference curve and qualified control pair ratio, whether qualified with the level of uttering long and high-pitched sounds evaluating variator.This qualified control line is y=5dB straight line, and when difference curve is lower than qualified control line, then the level of uttering long and high-pitched sounds of variator is defective, needs to optimize variator and utters long and high-pitched sounds; When difference curve is higher than qualified control line, then the level of uttering long and high-pitched sounds of variator is qualified; When difference curve in the above 6dB(of qualified control line and difference at more than 11dB) time, represent that the level of uttering long and high-pitched sounds of variator is outstanding, subjective scoring value of now uttering long and high-pitched sounds is 8 points (employing ten point systems).
As shown in Figure 3, application example of the present invention, 22 rank in Fig. 3 are that the gear that variator two keeps off is uttered long and high-pitched sounds order.First the noise data of collection is carried out analysis and obtain third-octave spectrogram and 22 rank sound pressure level curve maps; Then third-octave spectrogram is obtained corresponding sound pressure level curve by 22 rank sections; And it is poor that this sound pressure level curve and 22 rank sound pressure level curves are pressed corresponding rotating speed, the difference curve obtained is objective evaluation index curve; By this difference curve and qualified control pair ratio, with reference to the evaluation map in figure 3, can show that the utter long and high-pitched sounds level of this vehicle under this operating mode is all qualified, and reach superior level in the part range of speeds.
The present invention is poor by the variator order sound pressure level curve that obtains and variator order sound pressure level curve of uttering long and high-pitched sounds of cutting into slices of uttering long and high-pitched sounds by internal car noise third-octave spectrogram, the difference curve obtained to be uttered long and high-pitched sounds objective evaluation index as variator.Finally difference curve and qualified control pair ratio are obtained objective evaluation conclusion.
Claims (5)
1. a variator whistler method for objectively evaluating, is characterized in that, comprises the following steps:
Step one, test condition prepares: air-conditioning, fan, radio, multimedia system, door, window, air vent are all in closed condition, install noise testing sensor in crew module, and are connected with data acquisition and analytic system by noise testing sensor;
Step 2, test: automobile travels in the even acceleration of each gear or even deceleration art skating, and noise testing sensor gathers the noise data in car;
Step 3, noise data process:
3a, gathered noise data carried out to process and obtain third-octave spectrogram and variator and to utter long and high-pitched sounds order sound pressure level curve;
3b, make order cut into slices and obtain corresponding sound pressure level curve third-octave spectrogram, the order value doing order section is also for variator is uttered long and high-pitched sounds order;
3c, order sound pressure level curve of sound pressure level curve and variator being uttered long and high-pitched sounds are made difference by corresponding rotating speed and are obtained difference curve.
2. variator whistler method for objectively evaluating according to claim 1, it is characterized in that: also comprise step 4, noise rating: by described difference curve and qualified control pair ratio, when difference curve is lower than qualified control line, then the level of uttering long and high-pitched sounds of variator is defective; When difference curve is higher than qualified control line, then the level of uttering long and high-pitched sounds of variator is qualified.
3. variator whistler method for objectively evaluating according to claim 2, is characterized in that: in described step 4, and described qualified control line is the straight line of y=5dB.
4., according to the arbitrary described variator whistler method for objectively evaluating of claims 1 to 3, it is characterized in that: in test process, the road that vehicle travels should be level and smooth bituminous road or cement road, and road surface is without ponding and foreign material.
5., according to the arbitrary described variator whistler method for objectively evaluating of claims 1 to 3, it is characterized in that: described noise testing sensor is PCB 377B02, totally two, be arranged in front-row seats, back seat place.
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106840378A (en) * | 2017-02-23 | 2017-06-13 | 江铃汽车股份有限公司 | The evaluation method and system of automobile whistler |
| CN106959159A (en) * | 2017-05-31 | 2017-07-18 | 重庆长安汽车股份有限公司 | Method based on order hump amount quantitative assessment AT transmission gear whistlers |
| CN107123427A (en) * | 2016-02-21 | 2017-09-01 | 珠海格力电器股份有限公司 | Method and device for determining noise sound quality |
| CN107664579A (en) * | 2017-11-20 | 2018-02-06 | 哈尔滨东安汽车发动机制造有限公司 | Transmission gear, which is uttered long and high-pitched sounds, engages order extraction and decision method |
| CN108535012A (en) * | 2018-03-23 | 2018-09-14 | 重庆长安汽车股份有限公司 | A kind of transmission squawk NVH performances off-line test method |
| CN108896323A (en) * | 2018-08-31 | 2018-11-27 | 重庆长安汽车股份有限公司 | A kind of automobile wind is made an uproar the test method of leakage sound |
| CN109030014A (en) * | 2018-06-06 | 2018-12-18 | 上海汽车集团股份有限公司 | To the prediction technique of internal car noise subjective scoring when vehicle accelerates |
| CN109297718A (en) * | 2018-09-29 | 2019-02-01 | 重庆长安汽车股份有限公司 | A kind of evaluation method of order whistler |
| CN110261101A (en) * | 2019-06-14 | 2019-09-20 | 西安交通大学 | Quantitative evaluation method of uttering long and high-pitched sounds based on orthogonal-pairs of comparative test and SVR |
| CN110296847A (en) * | 2019-04-17 | 2019-10-01 | 开沃新能源汽车集团有限公司 | A kind of noise rating method of integral new-energy passenger |
| CN110767249A (en) * | 2019-10-31 | 2020-02-07 | 重庆长安汽车股份有限公司 | Loudness saliency-based automobile transmission system transient impact noise evaluation method |
| CN111693296A (en) * | 2020-06-09 | 2020-09-22 | 安徽江淮汽车集团股份有限公司 | Automobile squeaking checking method, device, equipment and storage medium |
| CN112461355A (en) * | 2020-11-17 | 2021-03-09 | 东风汽车集团有限公司 | Evaluation and analysis method for automobile pavement noise |
| CN112857834A (en) * | 2021-02-25 | 2021-05-28 | 浙江航驱汽车科技有限公司 | Method for evaluating running noise of double-pinion type electric power steering gear |
| CN113281035A (en) * | 2021-05-31 | 2021-08-20 | 重庆长安汽车股份有限公司 | Method for testing locking abnormal sound of automatic transmission |
| CN113343542A (en) * | 2021-07-14 | 2021-09-03 | 义乌吉利动力总成有限公司 | Optimal design method of intake manifold and intake manifold |
| CN113916543A (en) * | 2020-07-10 | 2022-01-11 | 襄阳中车电机技术有限公司 | Method for setting target value of order noise in vehicle based on background noise |
| CN114442585A (en) * | 2020-11-05 | 2022-05-06 | 上海汽车集团股份有限公司 | A vehicle data acquisition system, method and device based on the interaction of multiple vehicles |
| CN114660452A (en) * | 2020-12-24 | 2022-06-24 | 深圳臻宇新能源动力科技有限公司 | Method and device for detecting abnormality of generator |
| CN114813110A (en) * | 2022-05-09 | 2022-07-29 | 潍柴动力股份有限公司 | Gear howling detection method, device, computer equipment and storage medium |
| CN115435890A (en) * | 2021-06-02 | 2022-12-06 | 华晨宝马汽车有限公司 | Vehicle rumbling noise evaluation system and method |
| CN115750330A (en) * | 2022-11-22 | 2023-03-07 | 重庆长安汽车股份有限公司 | Method for optimizing transmission oil pump squeal noise |
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| CN107123427A (en) * | 2016-02-21 | 2017-09-01 | 珠海格力电器股份有限公司 | Method and device for determining noise sound quality |
| CN106840378A (en) * | 2017-02-23 | 2017-06-13 | 江铃汽车股份有限公司 | The evaluation method and system of automobile whistler |
| CN106959159A (en) * | 2017-05-31 | 2017-07-18 | 重庆长安汽车股份有限公司 | Method based on order hump amount quantitative assessment AT transmission gear whistlers |
| CN107664579A (en) * | 2017-11-20 | 2018-02-06 | 哈尔滨东安汽车发动机制造有限公司 | Transmission gear, which is uttered long and high-pitched sounds, engages order extraction and decision method |
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| CN110296847B (en) * | 2019-04-17 | 2021-06-01 | 开沃新能源汽车集团有限公司 | Noise testing method for new energy passenger car |
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| CN114813110A (en) * | 2022-05-09 | 2022-07-29 | 潍柴动力股份有限公司 | Gear howling detection method, device, computer equipment and storage medium |
| CN115750330A (en) * | 2022-11-22 | 2023-03-07 | 重庆长安汽车股份有限公司 | Method for optimizing transmission oil pump squeal noise |
| CN115750330B (en) * | 2022-11-22 | 2024-09-06 | 重庆长安汽车股份有限公司 | Method for optimizing transmission oil pump howling noise |
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Application publication date: 20150610 |
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