In order to address the problem that traditional passive suspension damping parameter cannot be adjusted which makes it difficult to improve vehicle ride comfort and handling stability, the paper proposes use of controllable magneto-rheological dampers in replace of passive dampers to establish semi-active suspension based on magneto-rheological dampers. By designing magneto-rheological damper ...

The paper focusses on optimal control issues arising in semi-active vehicle suspension motivated by the application of continuously controllable ERF-shock absorbers. Optimality of the damping control is measured by an objective consisting of a weighted sum of criteria related to safety and comfort which depend on the state variables of the vehicle dynamics model. In the case of linear objective...

The problem considered in this paper is the design and analysis of a control strategy, for semi-active suspensions in road vehicles, based on Model Predictive Control (MPC) techniques. The optimal control law we compute using predictive techniques aims to optimize, the suspension performance, by minimizing a quadratic cost function while ensuring that the magnitude of the forces generated by th...

This paper deals with single-wheel suspension car model. The benefits of controlled semi-active suspensions compared to passive ones are here emphasized. The contribution relies on robust analysis of a controller which improves comfort and road holding of the car under industrial specifications. Simulations on an exact nonlinear model of the suspension are performed for control validation.

In this work we study the problem of rope sway dynamics control for elevator systems. We choose to actuate the system with a semi-active damper mounted on the top of the elevator car. We propose nonlinear controllers based on Lyapunov theory, to actuate the semi-active damper and stabilize the rope sway dynamics. We study the stability of the proposed controllers, and test their performances on...

A preliminary study of a semi-active control system with pneumatic devices, aimed to improve the response of multi-degree of freedom structures to earthquakes, is presented. The devices are attached at various levels of a structural frame. The aim of the design is to find a combination of forces that are produced by the devices, in order to obtain optimal structural response. The mechanical res...

The dynamic behaviour of a vehicle (e.g. the dynamic tire forces, the suspension deflection, and the vertical acceleration of the sprung mass) can be improved significantly if the passive suspension is replaced by an active suspension with preview. Preview means that a priori information of the road surface is used in the control of the suspension. In this report, the rear wheels of the tractor...

Semi-active suspensions have drawn particular attention due to their superior performance over the other types of suspensions. One of their advantages is that their damping coefficient can be controlled without the need for any external source of power. In this study, three control approaches are implemented on a quarter-car model using MATLAB/Simulink. The investigated control methodologies ar...