Research on recognition of relationship between inner booming of a certain passenger car and shift line
To identify the roaring and vibration inside a four-wheel drive fuel passenger car during the development stage of the engineering prototype,a method based on chassis hub dynamometer was proposed to identify the relationship between the overall vehicle state inside booming and the transmission shift line under different engine throttle opening and gear positions.A chassis dynamometer test on the roaring sound inside the car was conducted,using the four-wheel drive hub semi anechoic chamber dynamometer hub with car mode.The engine started from the lowest speed in each gear and was taken as an integer multiple of 50.The throttle opening for each working condition ranged from 0%to 100%within 60 s,until the subjective evaluation of the roaring sound was acceptable(≥6.5 points)and the working condition was terminated.Based on the transmission shift line and subjective evaluation,a roaring evaluation chart was obtained and an optimization plan was proposed,providing a reference basis for the subsequent vibration and noise development of the entire vehicle product.
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