Abstract
The control performance of the vehicle will degrade due to the uncertain dynamics between the mathematical nominal plant description and the actual physical system. A robust control scheme is designed for an active suspension system so as to improve the system control performance. In the design of a robust control scheme, the real parametric uncertainties, as well as the structural uncertainty and time delay of the actuator, are taken into account, which is more realistic than the traditional control methods. Robustness performance and stability of the system are investigated and discussed in the paper. The μ synthesis controller is designed and compared with the H∞ control algorithm as well as the traditional passive suspension system. The control performance is validate under two typical road excitation conditions including the random road and the speed bump road. Simulation results show the effectiveness of the proposed control schemes compared to a H∞ approach.
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Abbreviations
- f s :
-
Active suspension force from hydraulic actuator
- s d :
-
Suspension deflection (m)
- a b :
-
Vehicle body vertical acceleration (m/s2)
- F U :
-
Upper linear fractional transformation (LFT) function
- e p :
-
Weighted evaluation values of vehicle performance
- d 1, d 2 :
-
Noises from measurement sensors
- x b :
-
Sprung mass displacement (m)
- x w :
-
Un-spring mass displacement (m)
- K(s):
-
The feedback gain of active suspension controller
- y :
-
Measurement state information form sensors, y = [xs − xu; ẍs]
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This work is financially supported by the NSFC Grants 5200 2025.
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Yunbao Yin received his M.E. degree in School of Vehicle Engineering, China North Vehicle Research Institute, Beijing, China in 2008. His research interests include vehicle dynamic and control, design and test of active suspension system.
Luo Bo is currently the Deputy Director of the UAV Center of the Army Aviation Institute. He obtained a master’s degree from the Artillery Command Academy in 2009. His research interests are UAV combat application, helicopter/UAV coordination, UAV mission equipment, etc.
Hongbin Ren received Ph.D. degree in Mechanical Engineering from Beijing Institute of Technology. He studied at the University of Michigan in Dearborn, Dearborn, USA, from 2012.10 to 2014.04 as a visiting scholar. Now he is an Assistant Professor in Beijing Institute of Technology. His current research interests include vehicle dynamics, state observer theory, motion planning, optimization, and optimal control.
Qiang Fang received his M.E. degree in School of Vehicle Engineering, China North Vehicle Research Institute, Beijing, China in 2011. His research interests include vehicle dynamic and control, design and test of suspension system.
Chunsheng Zhang received her M.E. degree in School of Vehicle Engineering, China North Vehicle Research Institute, Beijing, China in 2007. Her research interests include vehicle dynamic and control, design and test of suspension system.
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Yin, Y., Luo, B., Ren, H. et al. Robust control design for active suspension system with uncertain dynamics and actuator time delay. J Mech Sci Technol 36, 6319–6327 (2022). https://doi.org/10.1007/s12206-022-1143-1
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DOI: https://doi.org/10.1007/s12206-022-1143-1