Ikkurthi, Sivakoteswararao
(2015)
Performance Characteristics of Semi-Active and Passive Damper using Different Car Models.
Masters thesis, Indian Institute of Technology Hyderabad.
Abstract
Comfort performance of any vehicle depends on the dynamic characteristics of dampers. In this thesis, we analyze the influence of semi-active MR(Magneto rheological) damper using the quarter and half car models, and discuss about the nonlinear characteristics of passive oil damper using half car model. The vehicle suspension of quarter car model with MR damper is considered while the vehicle is traveling at constant speed on random road profile. The hysteretic behavior of the MR damper is characterized using modified Bouc-Wen model. Using equivalent linearization technique hysteretic behavior of MR damper is linearized and used in the state space form. Subsequently, the rms values of system response characteristics such as sprung mass acceleration, suspension stroke, road holding and control force verses vehicle velocity are obtained by solving matrix lyapunov equation in time domain. The system responses in term of above parameters are computed for the parameters related with MR damper at different current which are obtained from the experimental conducted in our group. It is found that as the current in MR damper increases, the control force also increases, thus, reducing the suspension stroke and road holding. However, the sprung mass acceleration is increases, which reduces the comfort. Hence, optimal application of current has to be used to actuate MR damper for a given disturbance. Similarly, we also analyzed the system response of front and rear suspension system using the half-car model. We obtain the similar characteristics as that in quarter car model.
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