Control of Flexible Half Car Model Suspension System

Abstract

The suspension system in vehicles plays a vital role in improving driving comfort and safety. Many researchers regarded the structure as rigid when investigating the behavior of the car's suspension and chassis with various driving conditions and unregulated road conditions. They have faced certain challenges to: ensure safety, driving comfort, and contact of the wheels with the road all the time, especially when turning at different road conditions. The purpose of this paper is to consider the flexibility of the structure during the design stage of the vehicle. especially when converting the suspension system from a passive suspension system to an active suspension system. Using finite element technique and MATLAB to obtain mass and stiffness matrices, which are to define the "state space".  The optimal system can be designed using the Linear Quadratic regulator technique (LQR). The results show that case for converting the system from its passive state to an active state, So, it is necessary to consider the chassis flexibility during design, especially for cars that have long wheelbases