Dynamic Analysis of Wiper System and Noise Prediction of Blade Reverse

Wiper noise generated in the wiping process is one of the main influence factors affecting the driving comfort. Since the dynamic contact pressure of the contact between a blade and a windshield glass is difficult to be measured, it is also difficult to predict the degree of the wiper noise. In this paper, in the view of the reversal noise problem of a passenger-vehicle windscreen wiper system, the system dynamic models of the both wipers on the sides of the driver and copilot were built as considering the blade deformation and the elastic contact between the blades and the windscreen glass, including the crank pivot, the four linkage mechanism, the wiper blades, the wiper arms and the windscreen glass. The motion of the wiper system and the pressure distributions between the blades and the windscreen glass were analyzed under the half-dry condition. Applying the reversal pressure results from the dynamic simulation as the boundary condition, the acoustic model composed of the windscreen glass and the vehicle cavity was built and the Vibro-Acoustic response was computed. Thus, the sound pressure of the driver seat was predicted. The results can provide necessary foundation to improve the wiper deign and reduce the blade reversal noise.