International Journal of Applied Mathematics and Machine LearningAuthor's: Zhaolong Cao
Pages: [181] - [196]
Received Date: November 15, 2014
Submitted by: Jianqiang Gao.
In order to improve the ride comfort and safety of engineering vehicle, the 1/4 vehicle semi-active hydro-pneumatic suspension dynamic model was established, and analysed the nonlinear characteristics of the hydro-pneumatic suspension spring force and damping force. For the nonlinear characteristics of the system, the suspension system nonlinear model accurate linearization was realized by the accurate linearization method based on the differential geometry theory. The LQG controller that applied to linear system was designed by applying the optimal control theory, and the weighted coefficient of LQG control performance index was determined by analytic hierarchy process (AHP). At last, the system control model was simulated in MATLAB/Simulink. The results show that: the ride comfort can be improved significantly by semi-active hydro-pneumatic suspension than passive hydro-pneumatic suspension, and the handling stability and running safety can be also improved.
hydro-pneumatic suspension, differential geometry, LQG control, accurate linearization, AHP.
