Modeling of an Attenuation Characteristics of the Damper Used for Micro Vibration of a Car Body (Third Report)

- Prediction of Vibration on a Model Car Body by Transfer Function Synthesis Method -

Abstract

The test damper developed for a micro vibration suppression of a car body can produce a velocity-independence nearly constant high damping force even in a very small velocity range. For selection of optimum damping force for an arbitrary car, it is necessary to establish prediction method of vibration on a car when a damper is installed, and the physical model of the damper itself is required. Previous report elucidated the generation mechanism of damping force and linearization method is described. In this report, vibration response estimation method of a car body is proposed when the test damper is installed This is the method that the vibration of a car body can be estimated from the values of compliances at input point of external force, evaluation point on a car body, coupling points between a car body and test damper, and the value of coupling stiffness. Feasibility of proposed method is examined through FEM simulation of a mock frame and a test damper. As a result, it can be found that the vibration responses estimated from proposed method and calculated by direct analysis agreed well each other. Further, taking applications on an actual car into consideration, vibration estimations in cases of multidirectional input and multi-point-inputs are performed.