회전식 MR댐퍼를 적용한 현가식 운전석의 진동제어

Abstract

MR fluid(Magnetorheological fluid) is smart fluid that can change viscosity of MR fluid when magnetic fields are applied. Recently, a large variety of MR device has been developed to use characteristics of MR fluid such as damper, brake and engine mount. This paper proposes a design of rotary MR damper to substitute existing a linear MR damper for seat suspension system and evaluates vibration characteristics of seat suspension system by performing control of vibration after constructing dynamic model of seat suspension system using proposed rotary MR damper. Rotary MR damper which is constructed on cross-link of seat suspension system replaces a function of liner MR damper. Prior to design of rotary MR damper, rotational damping coefficient is concluded when rotary MR damper is assembled on seat suspension system. For a performance analysis of the rotary MR damper, magnetostatic analysis is performed using the finite element model of rotary MR damper by applying current form 0 [A ] to 2.0 [A] on the model. The torque of the rotary MR damper is calculated based on the results of the magnetostatic analysis by simple equations. After design parameters of the rotary MR damper are selected, magnetostatic analysis is performed about change of design parameters. Thereafter the effect for damping characteristic of rotary MR damper is investigated. Vibration simulation is carried out to evaluate vibration isolation performance for proposed rotary MR damper. For study for vibration characteristics of rotary MR damper, seat suspension system is modeled with ADAMS which is software for analysis of multi-body dynamics. Thereafter co-simulation is performed with MATLAB/Simulink which can develop semi-active algorism and the seat suspension system model. Based on results of vibration control simulation, vibration isolation performance of rotary MR damper for seat suspension system is evaluated.