Transmission gear knocking testing and noise quality analyzing method

Abstract

The invention provides a mechanical transmission gear knocking noise testing and noise quality quantitative evaluating method. The invention provides a detailed mechanical transmission gear knocking vibration noise testing method which comprises the steps of arranging a microphone and a vibration acceleration transducer; and quantitatively generating transmission gear knocking noise frequency characteristics in an idling condition and a creeping condition of a vehicle from a vibration acceleration signal and a noise signal which are measured in testing according to a spectrum analysis method, a time frequency analysis method and a coherent analysis method. According to the method of the invention, a unique objective evaluating method for the transmission gear knocking noise, namely a psychological parameter based on a language sharpness index is defined; a quantitative linear relation between a subjective annoyance performance value and a language sharpness index is generated; the determined quantitative relation between the subjective evaluation result and the objective evaluation result can be used for a plurality of subsequent tests repeatedly; and test period, manpower cost and physical resource cost can be greatly reduced.

Description

technical field [0001] The invention relates to a method suitable for gear knocking experiments of vehicle mechanical transmissions and quantitatively evaluating gear knocking noise intensity. Background technique [0002] With the continuous development of vehicle power transmission system technology, in addition to the basic performance of power and economy, the problem of vibration and noise of the transmission system has attracted more and more attention from vehicle manufacturers and research institutions. Transmission gear knocking noise is a common vibration and noise phenomenon in the vehicle transmission system. It is different from other transmission system noises because of its obvious broadband noise characteristics. Failure, the solution of this problem directly affects the vehicle quality and corporate image. [0003] The knocking noise of transmission gears is the result of the comprehensive action of various components in the transmission system. The compone...

AI Technical Summary

Problems solved by technology

Transmission gear knocking noise is a common vibration and noise phenomenon in the vehicle transmission system. It is different from other transmission system noises because of its obvious broadband noise characteristics. Failure, the solution of this problem directly affects the vehicle quality and corporate image

[0003] The knocking noise phenomenon of transmission gears is the result of the comprehensive action of various components in the transmission system. The components of the transmission system have obvious nonlinear dynamic characteristics, so that solving the problem of transmission gear knocking requires a large time period and human and material costs.

The research on the suppression measures of transmission gear knocking is still in the exploratory stage, such as the parameter adjustment of the traditional driven disc torsional shock absorber or the use of dual-mass flywheel torsional shock absorbers, etc. The implementation of the suppression measures requires a lot of real vehicle experiments , how to quickly and effectively evaluate the knocking noise of transmission gears has become an urgent problem to be solved

At present, there is still no effective experimental method for transmission gear knocking noise. Only spectrum analysis or time-frequency analysis is performed on the measured noise signal to analyze and compare the level of gear knocking noise before and after the implementation of gear knocking suppression measures. It is difficult to accurately determine the frequency characteristics of gear knocking; the evaluation of gear knocking noise still relies on the qualitative evaluation results of experienced drivers. The results are obviously subjective and are greatly affected by external environmental factors. Repeated experiments require It consumes a lot of manpower and material costs, and still fails to give appropriate objective evaluation parameters and establish the relationship between subjective and objective evaluation results

[0004] The evaluation of transmission gear knocking noise depends on the qualitative evaluation results of experienced drivers. The results are obviously subjective and are greatly affected by external environmental factors. It takes a lot of manpower to carry out transmission gear knocking noise evaluation experiments many times. and material costs, and still fail to give a clear objective evaluation parameter of gear knocking noise and a clear relationship between subjective and objective evaluation methods

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