Experimental Investigation into Friction Induced Noise of Automotive Wiper System

Abstract:

A test was conducted to examine the vehicle interior noise,windscreen vibration and wiper blade vibration induced by wiper friction,under combination conditions with various wiping speed and windscreen wetness.The time-frequency noise characteristics,influence factors and noise source were approached by means of time domain,frequency domain and time-frequency domain analysis.The results indicate that wiper noise can be classified into reversal noise and wiping noise.The reversal noise is characterized by impulsive noise,and wiping noise is featured by wide-band noise with harmonic signals.The nature of both types of noises is strongly affected by the degree of windshield glass wetness,while it is far less affected by the wiping speed.The wiping noise is mainly resulted from lateral and vertical vibration of wiper blades.However,the wiping noise under rain and half-dry conditions is respectively caused by the vibration of driver side and co-driver side wiper blade.