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Improved operating condition transfer path analysis method capable of increasing precision

A transfer path analysis and working condition technology, which is applied to measuring devices, instruments, and measuring ultrasonic/sonic/infrasonic waves, etc., can solve problems such as doping noise, deviation of transmission path contribution results, frequency response function H deviation, etc., to improve The effect of precision

Inactive Publication Date: 2016-01-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The input signal matrix X and the output signal matrix Y are often doped with a lot of noise, which leads to deviations in the calculated frequency response function H, resulting in a large deviation in the transmission path contribution results

Method used

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  • Improved operating condition transfer path analysis method capable of increasing precision
  • Improved operating condition transfer path analysis method capable of increasing precision
  • Improved operating condition transfer path analysis method capable of increasing precision

Examples

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Embodiment

[0038] like figure 2 As shown, the established vehicle vibration model includes: engine 1, transmission 2, engine front mount 3, engine rear mount 4, transmission mount 5 and microphone 6; engine vibration passes through three mounts Transmitted into the car, it produces noise near the driver's ears. When using the transfer path analysis method of working conditions to analyze the contribution of the transfer path, the analysis excitation point is the passive end of the three engine mounts (body side), and the response point is the noise next to the driver's ear. Each mount analyzes the three vibration directions of X, Y and Z on the vehicle coordinate system, and there are 3×3=9 paths to transmit the vibration to the driver’s ear, generating noise; figure 1 As shown, follow the steps below to conduct transfer path analysis:

[0039] (1) One vibration sensor is arranged on the passive side of each mount, a total of three sensors are arranged, and the response point is the n...

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Abstract

The invention discloses an improved operating condition transfer path analysis method capable of increasing precision. The method comprises the following steps of step1, collecting operating condition excitation and response signals; step2, using a wavelet noise reduction technology to carry out noise reduction processing on the collected signals; step3, using the signals after noise reduction processing to calculate a frequency response function; step4, calculating a load; step5, calculating a transfer path contribution amount. The method possesses advantages that transfer path contribution amount calculating precision is effectively increased and so on.

Description

technical field [0001] The present invention relates to a technique for improving the precision of a working condition transmission path analysis method, in particular to an improved precision-improved method for analyzing a working condition transmission path. Do relevant calculations. Background technique [0002] Vehicles, especially hybrid vehicles, have many vibration sources, such as road excitation, tire excitation, engine excitation, motor excitation, exhaust system excitation, etc. These vibration sources have an impact on the vibration and noise in the car, etc. Judging these vibration sources The contribution of vibration and noise to the target point is the premise of vibration and noise reduction. At present, the transfer path analysis methods commonly used to analyze the contribution of vibration sources mainly include the traditional transfer path analysis method and the working condition transfer path analysis method, and most other methods are improved base...

Claims

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Application Information

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IPC IPC(8): G01H17/00
Inventor 陈吉清莫愁兰凤崇
Owner SOUTH CHINA UNIV OF TECH
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