A Novel Semi-Active Suspension System for Automobiles Using Jerk-Driven Damper (JDD)

Nirala, C K and R, Prasanth Kumar (2011) A Novel Semi-Active Suspension System for Automobiles Using Jerk-Driven Damper (JDD). Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

With the new advancements in the vibration control, the control strategies for the controllable semi-active dampers are finding their way as an essential part of vibration isolators, particularly in vehicle suspension systems. An analysis of frequency response for single degree of freedom (1DOF) system gives an attribute to the fact that in a semi-active suspension system, the damping coefficients can be adjusted to improve ride comfort and road handling performances. The systems study includes various type of semi-active suspension systems, employing nonlinear magnetorheological(MR) dampers that are controlled to provide improved vibration isolation. The currently available control strategies for semi-active dampers can be divided into two main groups. The first one is `On-Off' control and second one is `continuous' control of variable dampers. Available control strategies are either proportional to the relative velocity of sprung mass or the acceleration of sprung mass. A new control strategy which is proportional to the jerk produced in sprung mass called Jerk Driven Damper (JDD) is proposed and analyzed by the use of two state 'On-Off' damper. The control strategy for 'JDD' system is extremely simple and it involves very common logic. `JDD' system requires a two state controllable damper and jerk sensor. A brief study on controllable damper and jerk sensors are presented in this thesis.

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