Abstract
This paper conducts a road test with a certain brand SUV as the test object, and collects the rotation signal through the magnetic speed sensor, and then analyzes the various excitation components in the signal. In this paper, we analyze and process the rotation signal with MATLAB, and process the acquisition signal by interpolation method, in order to eliminate the frequency aliasing phenomenon,and then filtering out the engine excitation through the design of a simple filter. Finally, the time domain signal is Fourier transformed to obtain the frequency spectrum. Through the frequency spectrum analysis under the same speed of different gears, the law of torsional vibration of the driveline under the pavement excitation is obtained, and the abnormal fluctuation in the signal is diagnosed.
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