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:: Volume 11, Issue 3 (Journal of Control, V.11, N.3 Fall 2017) ::
JoC 2017, 11(3): 25-34 Back to browse issues page
Analytical Design of Constrained Nonlinear Optimal Controller for Vehicle Active Suspension System considering the Limitation of Hydraulic Actuator
Bahman Abdi Mr1, Mehdi Mirzaei Dr * 2, Sadra Rafatnia Mr1, Ahmad Akbari Alvanagh Dr3
1- PhD student Sahand University of Technology
2- Associate Professor Sahand University of Technology
3- Assistant Professor Sahand University of Technology
Abstract:   (1681 Views)

In this paper, a constrained nonlinear optimal control law is analytically developed for vehicle active suspension system considering the limitation of hydraulic actuator. In the design of the controller, the nonlinear characteristics of spring and damper forces and hydraulic actuator are considered. The control input is the displacement of the hydraulic valve spool which is bounded in practice and its constraint should be considered in the design process. In the proposed method, the control problem is firstly transformed to a constrained nonlinear optimization problem by performing a performance index defined as a weighted combination of predicted responses of nonlinear suspension system and control input. Then, this equivalent constrained optimization problem is solved using Kuhn-Tucker theorem to find the constrained optimal control law. The derived control law is in the closed form which is easy to solve and implementation. The controller performance is evaluated through computer simulation of the vehicle suspension model excited by a random road input. The obtained result indicate a remarkable decrease of the body acceleration which leads to the ride comfort. Meanwhile, other suspension responses including suspension and tire deflections are in suitable ranges.  

Keywords: active suspension system, constrained optimal control, nonlinear control, hydraulic actuator.
Full-Text [PDF 1205 kb]   (1209 Downloads)    
Type of Study: Research | Subject: Special
Received: 2016/08/9 | Accepted: 2017/06/4 | Published: 2017/08/28
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Abdi B, Mirzaei M, Rafatnia S, Akbari Alvanagh A. Analytical Design of Constrained Nonlinear Optimal Controller for Vehicle Active Suspension System considering the Limitation of Hydraulic Actuator . JoC. 2017; 11 (3) :25-34
URL: http://joc.kntu.ac.ir/article-1-397-en.html


Volume 11, Issue 3 (Journal of Control, V.11, N.3 Fall 2017) Back to browse issues page
مجله کنترل Journal of Control
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