This talk will focus on some concepts from nonlinear systems analysis and how they are used for the design, analysis and control of a variable stiffness suspension system. The system in question is a simple mechanical arrangement in which an effective variation of stiffness is achieved by dynamically moving the horizontal location of the point of attachment of the suspension to the chassis. This movement can be controlled passively, semi-actively and actively, depending on the actuator choice.
Optimal control theory is used to create a motivational theoretical foundation for the merits of combined damping-stiffness variation in suspension design. The system is analysed using an L2-gain analysis based on the concept of energy dissipation. The analyses, simulation, and experimental results show that the variable stiffness suspension can achieve a better performance than the constant stiffness counterpart. The performance criteria used are; ride comfort, suspension detection and road holding. Futhermore, adaptive control techniques and time scale decomposition using Tichonov theorem are used to control the active and semi-active actuators. All stability analyses are done using Lyapunov and Lyapunov-like theorems. Finally, the problem of roll stablization enhancement of road vehicles using the variable stiffness suspension system is considered.
About the Speaker
Olugbenga Moses Anubi is a postdoctoral researcher at the Hyundai Center of Excellence in Vehicle Systems Dynamics and Control at the University of California, Davis, CA. He received his B.S (Hons) in Systems Engineering from the University of Lagos, Nigeria in 2006 and his doctoral degree in Mechanical Engineering from the University of Florida, Gainesville in 2013. His research interests are; Control theoretical development and applications, Bond graph modeling of dynamical systems, Vehicle system dynamics and control, Soft computing and Robotics.
Date(s) - 04/03/2014
4:10 pm - 5:00 pm
1062 Bainer Classroom