Multi-domain unified modeling and simulation of semi-active suspension in magnerorheological damper
In order to build high-precision and highefficient MR damper system model, a multi-domain unified modeling method was proposed. Firstly, based on the analysis of a MR damper semi-active suspension system model, various fields of MR, such as structure, magnetic field, control and mechanics, were studied to find the main influencing parameters. And then for the multi-domain coupling characteristics of MR damper, a multi-domain unified modeling of MR damper system was established based on Modelica/MWorks platform. By adjusting the main influencing parameters, the relationship diagrams between the parameters and the performances were obtained. Finally, some performance results were compared with the traditional method used Matlab/simulink modeling and the method proposed. The results show that the model based on Modelica can preferably reflect the complex relationship between the MR damper coupling among the parameters within the system, and can get a better simulation result.
Research on control and performance of base on MR Semi-active suspension in automobile
A mini-car was chosen as a reference model and a magnetorheological damper as the research object.According to vehicle dynamics theory,a 1/4 car semi-active suspension control system dynamics model was set up.Based on shyhook control algorithm,the performance of the magnetorheological semi-active suspension was analysized and control was studied by using modern control technology.The studies have shown that combining the appropriate control algorithm,can make fully use of the semi-active suspension system properties with the magnetorheological damper and effectively improve the comfort and handling stability of the vehicles.Using the parameters of a type mini-car,the sprung mass acceleration,suspension deflections and tire load three index under different control strategies were compared.The results show that the control strategy in the selection of complex multi-mode control has better control effect and can more effectively improve the dynamic performance of the vehicles.
A LPV BASED SEMI-ACTIVE SUSPENSION CONTROL STRATEGY
In this paper we consider the design and analysis of a semi-active suspension controller. In the recent years different kinds of semi-active control strategies, like two-state Skyhook, LQ-clipped or model-predictive, have already been developed in the literature. In this paper we introduce a new semi-active suspension control strategy that achieves a priori limitations of a semi-active suspension actuator (dissipative constraint and force bounds) through the Linear Parameter Varying (LPV) theory. This new approach exhibits some interesting advantages compared to already existing methods (implementation, performance flexibility, robustness etc.). Both industrial criterion evaluation and simulations on nonlinear quarter vehicle model are performed to show the efficiency of the method and to validate the theoretical approach.