Automobile wiper systems provide a clear sight for drivers by creating a very thin layer of water about few dozen nano meters on a windshield. Several studies have been carried out to investigate the dynamic behavior of the wiper systems. However, there are few studies focused on reversal behavior of the wiper blade. Observation was conducted and analytical model is developed from the observation of the real wiper system. A water layer is considered in the analytical model between the wiper blade and the glass surface. The bottom of the model is assumed to always contact the water layer so that the fluid force is always applied. The dimensionless equations, which govern the wiping motion including the reversal behavior, were derived. The equations are discussed neglecting the nonlinear terms to understand the approximate movement and effect of the parameters. Moreover, the equation is solved numerically to obtain the time histories of the wiper blade. As a result, the effect of the fluid force, which acts on the wiper blade on the reversal behavior of the wiper blade, became clear.

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Recently ， wiping performance simulation and theoretical analysis of a wiper is desired to streamhne the development of it． This research aims to dcscribe the dynamics of the rcvcrsal bchavior of the wiper bladc ． First ， the experiment with the cut modcl of actual blade rubbcr was conductcd to observc the reversal behavior of wiper b ｝ ade ． To thcoretically idcnti 域 the mechanism ， governlng equations are derived from the analytical model of wiper b 正 ade which consists of a rigid bar ． Bifurcation produced in the reversal behavior is discu5sed with the equation of equilibrium focusing on the friction acting the rubber ．