A New Model and an Optimal Pole-Placement Control of the Macpherson Suspension System 1999-01-1331
In this paper a new model and an optimal pole-placement control for the Macpherson suspension system are investigated. The focus in this new modeling is the rotational motion of the unsprung mass. The two generalized coordinates selected in this new model are the vertical displacement of the sprung mass and the angular displacement of the control arm. The vertical acceleration of the sprung mass is measured, while the angular displacement of the control arm is estimated. It is shown that the conventional model is a special case of this new model since the transfer function of this new model coincides with that of the conventional one if the lower support point of the damper is located at the mass center of the unsprung mass. It is also shown that the resonance frequencies of this new model agree better with the experimental results. Therefore, this new model is more general in the sense that it provides an extra degree of freedom in determining a plant model for control system design. An optimal pole-placement control which combines the LQ control and the pole-placement technique is investigated using this new model. The control law derived for an active suspension system is applied to the system with a semi-active damper, and the performance degradation with a semi-active actuator is evaluated. Simulations are provided.
Keum-Shik Hong, Dong-Seop Jeon, Wan-Suk Yoo, Hyun Sunwoo, Sang-Yoon Shin, Cheol-Min Kim, Byung-Suk Park
School of Mechanical Engineering, Pusan National University Pusan, Korea, Daewoo Precision Industries, Ltd., Technical Center Pusan, Korea, Korea Atomic Energy Research Institute Taejon, Korea
International Congress & Exposition
Electronic Steering and Suspension Systems-PT-77, Steering and Suspension Technology Symposium 1999-SP-1438, SAE 1999 Transactions - Journal of Passenger Cars-V108-6