Method for evaluating transmission-generated abnormal sound of vehicle hydraulic shock absorber

Abstract

The invention discloses a method for evaluating the transmission-generated abnormal sound of a vehicle hydraulic shock absorber, which comprises the following steps of: S1, using an iteratively-loaded sinusoidal signal as a displacement excitation of a test bench moving head to simulate the driving of a car on a rough road surface; S2, setting a sound pressure sensor; S3, using the score rating method to make subjective evaluations of the near-field noise radiated by the absorber itself, and based on this, evaluating the transmission-generated abnormal sound level of the absorber; S4, dividing the collected near-field radiation noise frequency of the shock absorber into blocks, calculating the linear sound pressure level of the noise signal in each sub-frequency band, finding the characteristic sub-frequency band with the highest correlation with the subjective evaluations, and based on this, determining the characteristic frequency band range for the shock absorber's transmission-generated abnormal sound; and S5, making objective evaluations on the shock absorber's transmission-generated abnormal sound indicators. The method of the invention directly utilizes the radiation noise of the shock absorber to carry out the evaluation of the transmission-generated abnormal sound of a shock absorber, which can reflect the level of the transmission-generated abnormal sound of the shock absorber simply and truly.

Description

technical field [0001] The invention belongs to the technical field of noise, vibration, and harshness (NVH) of automobiles, and in particular relates to a transmission abnormal sound evaluation method of a vehicle hydraulic shock absorber. Background technique [0002] After more than ten years of "double-digit" growth, my country's auto industry has entered a steady growth stage of connotative development. Production capacity growth at this stage is no longer the mainstream, but instead the continuous improvement of model quality. A lot of practice shows that when "abnormal and unexpected noise" or "abnormal noise" occurs, the sound quality of the vehicle will inevitably be greatly weakened. Therefore, suppressing or eliminating abnormal noise naturally becomes the key to improving sound quality. Among them, hydraulic shock absorbers are widely used in vehicle suspension systems at this stage, and their abnormal noise has long plagued the automotive industry. In recent ...

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Problems solved by technology

)", which uses the acceleration root mean square index of the vibration signal of the piston rod of the shock absorber to evaluate the abnormal sound of the shock absorber, but the vibration signal of the piston rod of the shock absorber contains less transmission abnormal noise information, which is only applicable to the abnormal noise of the impact Evaluation, the identification effect of abnormal noise in transmission is not good

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