自動車用ワイパのびびり振動 : 第1報, 一本式のワイパの一自由度系によるモデル化と振動特性

抄録

This paper deals with chatter vibrations of an automotive wiper with one arm. First, an experimental apparatus which simulates the wiper is made. Using the apparatus, friction characteristics between the rubber blade and the glass disk are investigated. Next, the chatter vibrations are examined experimentally. It is found that in a certain region of disk speeds two types of steady state motion are observed : one is chatter vibration and the other is stable equilibrium. Regarding the experimental system as a single-degree-of freedom system, we derive the equations of motion. Solving it, we found that the motion observed experimentally is confirmed to occur. Also we found that a jump is observed in the amplitude of the vibration characteristics, and that the jump is associated with sub-critical Hopf bifurcation. Finally, the effects of parameters consisting of the friction characteristics on the vibration characteristics are evaluated numerically. It is found that the sub-critical Hopf bifurcation is influenced by cubic non-linearity of the friction characteristics.