| This article mainly introduced the background of magnetorheological damper and vehicle magnetorheological semi-active suspension system and explained the necessity of this research as well as the purpose and significance of the study, combining with the magnetorheological damper based on the vehicle semi-active suspension systems. Considering the MRF semi-active suspension in practice, the author determined the specific needs of the main content of this article.The author mainly research on the system design and simulation for the magnetorheological damper, dynamic characteristic and control policy of the vehicle MRF semi-active suspension by using the theoretical analysis and simulation research. The necessity of property rights of intelligence suspension system has been analyzed. And then, the present development situation of the MRF semi-active suspension is elaborated. The paper has researched on the situation of domestic and foreign control policy for the vehicles semi-active suspension system.The performance of the magnetorheological liquid and the working principle of the magnetorheological damper have been studied. As well as, it carried out the damping force formula and established the simulation model of the magnetorheological damper according to them. It has built the vehicle MRF semi-active suspension simulation platform and established the 1/4 dynamics model for passive suspension and the vehicle MRF semi-active suspension according to the automobile dynamics principle. It has studied the influence of different damping factor to the vehicle suspension system and analyzed suspension system response under the pulse inputs.Combined with the characteristics of the magnetorheological suspension, it has determined the compression way of the magnetorheological damper and established simulation model of the electric current driver according to the control system demand. On which it has carried out a ceiling damping controller and a fuzzy controller and proposed a new wavelet frequency range fuzzy controller design, as well as, conducted the exploring research to it. This article carried on the simulation separately and analyzed the simulation results for the different controllers, which is established on simulation platform of the MRF semi-active suspension. The simulation result indicated that these kinds of control policy can suppress vehicle body vibration to some extent, while maintained a good smooth running except the ceiling damped control has sacrificed outside the operation stability. The integrated control potency of the other two kinds of control policy was good, the wavelet frequency range fuzzy control the control effect must slightly surpass the fuzzy control under the bad travel condition. All above has provided a reference for the further research and development of the MRF semi-active suspension.According to the research of vehicle semi-active suspension exploratory study and control strategy in this article, it provided companies a good reference, but also supplied a theoretical support. This article provided new ideas and methods to semi-active magnetorheological suspension control system studies, which has a certain research value and practical significance. |
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