Linear quadratic Gaussian application and clipped optimal algorithm using for semi active vibration of passenger car

Abstract

A novel semi active control system for eleven Degrees of Freedom passenger car's suspension system using Magneto rheological damper is presented. The considered suspension system is modeled using mass spring damper model. The semi active vibration control is designed to reduce the amplitude of vehicle's vibration due to by road profile. The applied control strategies are based on a Linear Quadratic Gaussian optimal control algorithm to obtain desired damping forces of MR dampers. In considered system, the damping coefficient of the shock absorber changes actively through inducing magnetic field. The necessary input voltage to MR dampers to generate desired damping forces are derived using inverse dynamic model of MR damper using clipped optimal model. It is observed that the amplitude of vibration response can be significantly reduced using proposed semi active control scheme.

Predictive roll, handling and ride control of vehicles via active suspensions

“…Decoupling between the left and right actuators made it possible not only to stabilize roll motion but also the pitch and bounce motions of the sprung mass [5]. Based on the Multiple Input Multiple Output (MIMO) nature of this control problem, Linear Quadratic (LQ) controllers designed based on a full vehicle model were proposed by many authors [6] [7]. More recently, ref [8] discussed the possibility of applying Model Predictive Control (MPC) to reduce actuation effort, improve ride quality and stabilize vertical tire loads.…”

Implementation of an Electromagnetic Regenerative Tuned Mass Damper in a Vehicle Suspension System

“…The most common approaches are the comfort-oriented sky-hook control 6 and the road-holding oriented ground-hook control 7 . Semiactive clipped techniques such as clipped linear-quadratic 8 , clipped 9 and clipped model predictive control 10 are proposed as modern approaches. However, due to the presence of invariant points property of the 2-DOFs system, such techniques can improve performance only in limited frequencies area.…”