Abstract
The present damper developed for a micro vibration suppression of a car body, that uses an oil hydraulic pressure control valve for generating damping force, is able to produce a velocity-independence nearly constant damping force unlike an ordinary viscous damper and hence to produce a large damping force in a very small velocity range. However, a particular account of the generation mechanism of a damping force has not been given so far. This paper presents firstly the derivation of equation for attenuation characteristics; nonlinearity of the present damper with a built-in oil hydraulic pressure control valve as an attenuation mechanism. Next, linear attenuation coefficient equivalent to the non-linear damping force is driven using a describing function method and then the validity of modeling of damping mechanism and its linearization technique is verified on the basis of comparison of simulations with experiments.
