Design And Development Of A Full Scale Shock Absorber Test Machine

Mohd Zakaria, Mohamad Nasir and Khisbullah , Hudha and Faizul Akmar , Abdul Kadir and Mohd Hanif, Harun and Ubaidillah, . (2005) Design And Development Of A Full Scale Shock Absorber Test Machine. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This research focuses on modeling a Magne-Ride damper and its uses in overcoming the effects of road disturbance to the vehicle ride comfort. It was begun from design and development a shock absorber suspension test machine. Then further study on the performance of a sixth order polynomial approach to model the nonlinear hysteresis behavior of magnetorheological (MR) damper. The polynomial mode! was developed based on curve fitting from the experimental results and consists of a pair subsystem namely positive and negative acceleration which correspond to the upper and lower curves obtained from the experimental results. The performance of the proposed polynomial model was compared with a well known non-parametric technique namely inverse model. The energy dissipated and equivalent damping coefficient of the MR damper in terms of input current and displacement amplitude were also investigated. From the simulation results, the sixth order polynomial model shows better performance in describing the nonlinear hysteresis behavior of MR damper compared to the inverse model. The force tracking control in both simulation and experimental studies demonstrate that a close-loop PI control has the ability to track the desired damping force well. The governing equations of motions were formulated and integrated with skyhook control. Skyhook policy was then adapted in the development of a fuzzy logic control to enhance the ride performance. The performance of fuzzy logic control was compared with the on-off and continuous skyhook control in time domain. The results show that skyhook algorithm based fuzzy logic control gives better perfom1ances than its counterparts.

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