AN INVASTIGATION OF BAND-LIMITED FLUID DAMPER CONFIGURATION USING LUMPED PARAMETER MODELING

Abstract

Vehicle suspension system is one of the key factors related to the vehicle dynamic characteristic. The fine tuning of suspension system between vehicle handling and ride comfort is not only a trade-off between these two aspects, but also, has its impact on vehicle safety and durability. For an optimal damper performance, the damper needs to generate sufficient damping force at maneuvering frequency (< 2 Hz); and it also needs to generate less damping force, which allow spring to filter the high frequency noise (> 2 Hz) generated by vehicle travels along rough road condition at speed. In order to achieve such performance, a lumped parameter model of Band-Limited Damper is proposed. Frequency response of both Conventional Damper and Band-Limited Damper are studied and compared. Also, Lumped Parameter Quarter Car Models are used to compare the system frequency response of the one with Conventional Damper to the ones with Band-Limited Damper. In addition, performance index of two type of systems are calculated by using a generated road profile input. Based on the comparative studies, suggestions and conclusion are made.