Dynamic Response Analysis Of Large Bus Semi-Active Suspension System

As an important part of transportation, the passenger car plays an important role in modern life. As the development of technology and living standard, people have higher requirements in performance of passenger car such as ride comfort, handle ability and stability. Suspension of car closely related with brake, shock absorber, turning around, and performance of transmission. It directly affects operation stability and ride comfort of vehicle. Subject to its principle, damping effect of traditional passive suspension is limited. Compared with passive suspension, semi-active suspension plays better performance in damping effect, has lower cost and energy consumption, which makes it become a research focus in this area.To study the vehicle ride comfort, of big passenger car, this paper builds whole passive suspension and semi-active suspension dummy vehicle models separately in ADAMS/View. By analyzing physical movement of passenger car, based on MR damper, semi-active suspension operating principle, combining with fuzzy logical control principle, this paper develops a semi-active suspension system of fuzzy control strategy separately to vertical, rolling vibration and pitching vibration. With fuzzy controllers design module in MATLAB/Simulink, this paper achieves fuzzy control subsystem of Semi-active suspension system. Based on multi-system co-simulation method, with the established vehicle virtual prototype and fuzzy control subsystem, it also establishes a joint simulation platform between ADAMS and MATLAB, and evaluates the vehicle ride comfort with a random input and pulse input. The results show that fuzzy logical control method designed in this paper can improve the vehicle's ride comfort effectively.This paper also establishes the finite element model of the body frame, analyses modal of body frame, and establishes the whole body finite element model on this basis. With the driver to body by passive and semi-active suspension in the same condition, it makes frequency response analysis for the finite element model of the vehicle body. The results show that compared with passive suspension, semi-active suspension can effectively reduce acceleration response on the key points of the body.