Chatter Vibrations of an Automotive Wiper (2nd Report, quenching of Chatter Vibrations by Harmonic Excitation Normal to Sliding Surface)

摘要

This paper deals with the problem of quenching chatter vibrations of an automotive wiper. As a means for quenching chatter vibrations, we consider application of harmonic excitation normal to the sliding surface. To study whether the hormonic excitation is effective, first we study by numerical simulation and by experiments the friction characteristics between the wiper and the glass surface. We find that the harmonic excitation decreases negative slope in the friction characteristics. Then we study by numerical simulation and by experiments, effects of the harmonic excitation on the vibrations. We find that, if the amplitude of the harmonic excitation is of the same order as the magnitude of the static normal load, the harmonic excitation quenches the chatter vibrations. We also find that, for chatter vibrations of subcritical type, it is enough to apply the excitation for a short period till the vibration is entrained into an equilibrium state.