Method and device for testing shake of whole automobile during urgent acceleration of automobile

Abstract

The invention discloses a method and device for testing shake of a whole automobile during urgent acceleration and the automobile. The method includes utilizing a three-way vibration sensor to measure vibration acceleration time domain data of a seat guide rail during urgent acceleration of the automobile, and obtaining vibration velocity time domain data according to the vibration acceleration time domain data; intercepting vibration velocity time domain data at an interval of fixed rotating shaft rotation speed and performing Fourier frequency spectrum transformation to obtain a Campbell spectrogram related with rotating shaft rotation speed, extracting a second-order component from the Campbell spectrogram, and using the peak value of the second-order component as an objective index; aiming at multiple automobiles with different shakes, obtaining the subjective score and objective index of each automobile, and determining a corresponding relation between the objective index and the subjective score of each automobile through a scatter diagram; and finally, determining a shake target value according to the objective index corresponding to a qualified score.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a method and device for testing the vibration of the whole vehicle when the automobile is rapidly accelerated. Background technique [0002] As one of the overall performance indicators of automobiles, NVH (Noise, Vibration, Harshness) performance indicators are increasingly valued by consumers. Automobile NVH performance indicators are often evaluated by subjective evaluation and objective data. The subjective feeling is simple and easy to operate, but it often changes randomly with subjective factors, and will be affected by differences in the driving level, psychological expectations, and fatigue levels of driving testers. It is often difficult to determine the actual optimization effect of NVH characteristics during the tuning process due to subjective factors. Objective data needs specific processing to correspond to the subjective experience of NVH, but objective data ...

AI Technical Summary

Problems solved by technology

[0003] For front-rear-wheel-drive and front-four-wheel-drive vehicles, when the low-gear full-throttle acceleration is rapid, obvious vehicle vibrations are likely to appear on the body floor. For this kind of vibration, currently, only subjective feelings can be used to evaluate the vibration. There is no accurate objective evaluation index. In order to facilitate the adjustment of low-frequency jitter problems, it is urgent to find an objective measurement index that can quantify the severity of vehicle jitter and determine the objective target value of vehicle jitter.

Images