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Method for quantitatively evaluating knocking noise of transmission system by using language definition

A technology of speech intelligibility and transmission system, which can be used in the measurement of ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., and can solve problems such as misjudgment of evaluation

Active Publication Date: 2015-06-03
CHONGQING CHANGAN AUTOMOBILE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for quantitatively and objectively evaluating the percussion noise of the transmission system by using language clarity to solve the problem of evaluation misjudgment caused by evaluation individual differences in subjective evaluation

Method used

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  • Method for quantitatively evaluating knocking noise of transmission system by using language definition
  • Method for quantitatively evaluating knocking noise of transmission system by using language definition
  • Method for quantitatively evaluating knocking noise of transmission system by using language definition

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Experimental program
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Embodiment Construction

[0028] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0029] see image 3 , the implementation process of this method is as follows:

[0030] 1. Microphone placement:

[0031] like figure 1 As shown, the microphones are arranged at the right ear positions of the driver, co-pilot, and rear left and right passengers, ensuring that the distance between the four microphones and the vertical position of the seat back is about 10 cm, and that the four microphones are at the same level.

[0032] 2. Test process:

[0033] Put the vehicle into each gear, accelerate at full throttle at 1000-4000rpm, collect the noise data of the acceleration process, and repeat the test for more than 3 times.

[0034] 3. Data processing and percussion noise evaluation: select effective data for speech clarity analysis and calculation, and get

[0035] The language intelligibility curve AI(n) of the acceleration noise of...

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Abstract

The invention discloses a method for quantitatively knocking noise of a transmission system by using language definition. The method comprises the following steps of: carrying out effectiveness judgment on a noise signal collected from a sensor; selecting effective data to carry out language definition analysis and calculation to obtain a language definition curve AI (n) of the accelerated noise of each gear; fitting the calculated language definition of each rotating speed by using a least square method to obtain a straight line L (n); and carrying out evaluation on the knocking noise of each gear of the transmission system according to a difference value delta AI (n) between the language definition AI (n) corresponding to each rotating speed and the language definition fitting straight line L (n). The method disclosed by the invention can be used for objectively and accurately reflecting the size of the knocking noise of an automobile.

Description

technical field [0001] The invention belongs to an evaluation method in the field of transmission system vibration and noise. Background technique [0002] With the continuous improvement of the vibration and noise performance of automobiles, the sound pressure level of automobile interior noise can no longer reflect the quality of automobile comfort. The sound quality of interior noise has become more and more important. The impact of knock noise on the sound quality in the car is particularly significant. At present, there is no good objective evaluation index for the evaluation of the knocking noise of the transmission system, so people usually use subjective evaluation to determine the severity of the knocking noise qualitatively, but everyone feels differently about the sound. , different people may get different evaluation results for knock noise. Contents of the invention [0003] The invention provides a method for quantitatively and objectively evaluating the pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00
Inventor 李宏成庞剑李传兵唐禹毕金亮田雄
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD