Simulation study of nonlinear active air suspensionbased on differential geometry(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2018年04期
- Page:
- 102-110
- Research Field:
- 汽车与机械工程
- Publishing date:
Info
- Title:
- Simulation study of nonlinear active air suspensionbased on differential geometry
- Author(s):
- ZHAO Dan; MA Jian; WANG Jianfeng
- (School of Automobile, Changan University, Xian 710064, Shaanxi, China)
- Keywords:
- automotive engineering; air spring; differential geometry; adaptive genetic algorithm; simulation
- PACS:
- -
- DOI:
- -
- Abstract:
- Aim at the passive air suspension systems cannot solve the problem of vehicle ride comfort and handling stability well, a targeted active control strategy was researched based on the nonlinear characteristics of air suspension, to improve performance further and realize better adjustment of the vehicles under various road conditions. The buswithairspring experiment was carried out, and the nonlinear elastic force of the air spring and nonlinear damping force data, which was based on the measured data, were obtained. The nonlinear active air suspension model was established using MATLAB/Simulink. The outputinterference decoupling method for differential geometry theory was used, 1/4 nonlinear active air suspension model was simplified into a linear system using appropriate coordinate transformation, and linear quadratic regulator（LQR） optimal control was implemented. The adaptive genetic algorithm was used to determine the optimal LQR control matrix. The characteristics of the active air suspension performance evaluation index were analyzed to formulate the appropriate fitness functions, and the adaptive global optimization ability of the genetic algorithm was used to obtain the optimal control matrix. The optimal feedback control of the nonlinear active air suspension was thus obtained. Simulation experiments were carried out on vehicle models with different road surface roughness curves and different speeds as incentives, and the simulation results were analyzed. The results show that the design of the optimal controller based on differential geometry theory obtains good control. The body vertical vibration acceleration, suspension dynamic deflection, and improvement in the tire deformation are evident. This can improve the vehicle riding comfort and safety effectively. The results can also provide a useful theoretical reference for the control of nonlinear automobile suspensions. 1 tab, 7 figs, 37 refs.
Last Update: 2018-08-03