A NONLINEAR DAMPING-ASSIGNMENT CONTROLLER FOR SEMI-ACTIVE SUSPENSION SYSTEMS

摘要

Suspension system plays an important role in the ride comfort and stability of vehicles. The key objective of a suspension system is to absorb the vibrations produced due to road irregularities and reduce its effects at the passenger seat. The three main performance characteristics used in regular suspension design are ride comfort, suspension deflection and handling. The primary components of an automobile suspension are the spring and damper. With the advancement in technology, semi-active and active suspensions have made their way into the automobile design industry. Semi-active suspensions harbour magnetorheological (MR) dampers which provide a way to control the damping force by controlling the input current to it. In this study, we propose a nonlinear damping-assignment controller for semi active suspension systems. In order to study the effects of the controller, a non-linear mathematical model of a 2-DOF quarter car is considered. The performance of the controller is compared with passive suspension systems and semi-active suspension systems with linear controllers such as PID control and Sliding Mode Control (SMC).