Vibration Control Of Linear And Rotary Magnetorheological Dampers For Vehicle Seat Suspension

People pay more and more attention on the ride comfort of the vehicle with the improvement of material life level. As the direct bearer of crew, seat is closely related to the seating comfort. In order to improve the ride comfort, two methods are commonly used.One is by reducing the vibration of the input source(Such as the vibration of the primary suspension sprung mass caused by the road excitation, and the engine vibration, etc), this method is more effective but the structure is relatively complex and the cost is high. Another way is by adjusting the stiffness and damping parameters of the seat directly, for using better bubbles, this method is simple and certain result can be obtained, but due to the stiffness and damping parameters can't adaptive change as the environment changes(Changes such as motivation and the ride quality), the comfort improvement is limited. It is necessary to research a kind of intelligent seat that can change with the external environment.As a kind of smart controllable components, magnetorheological damper is very suitable for the seat vibration control with the advantages of its simple structure, large damping force, wide dynamic range, fast response speed, less energy consumption. At present, linear magnetorheological damper have been used to improve the seating comfort by some scholars and enterprises and good results have been achieved. While the following problems exist,the complex of control system, the higher cost, so it is not conducive to large-scale application. Therefore, the research of a magnetorheological damping system that is simple and cheaper is necessary. To solve this problem, this paper proposes a damping system implying on the seat based on the rotary magnetorheological damper. Comparative study of the seat vibration system with linear and rotary magnetorheological damper was initiated through theoretical calculation, the simulation analysis and test validation. Providing a new research idea in improving the integration of the seat vibration system and the reliability, reducing costs. Research work of this paper includes the following aspects:(1) The research content of this paper was put forward on the basis of summary, analysis the research situation of linear and rotary magnetorheological damper and car seat vibration reduction. For the purpose of improving the ride comfort,the designing of linear and rotary magnetorheological damper was based on the relevant design theory of magnetorheological components. The theoretical calculation, structure design, magnetic circuit design included. The structure size was determined in the end.(2) Respectively processing development of linear and rotary magnetorheological damper according to the optimal design parameters. The indicator experiment for linear magnetorheological damper was carried out on the MTS test system, the torque test for rotary magnetorheological damper was carried out on the building platform. The indicator and speed characteristic curve of the linear magnetorheological damper was obtained. Torque characteristic of the rotary magnetorheological dampers under different electric flow and speed was obtained.(3) The control simulation study of the seat vibration system based on linear and rotary magnetorheological damper was done. A single degree of freedom model of seat suspension was established on the basis understanding the seat comfort evaluation index. The relationship between the control current and coulomb damping force of the linear magnetorheological damper and relationship between the control current and coulomb damping torque of the rotary magnetorheological damper was developed on the basis of the test results. A controller based on skyhook control strategy was designed. Simulation of seat suspension vibration control study was developed. The results show the effectiveness of the two kinds of damper used in the seat vibration and similar vibration damping effect was received.(4) The experimental study on the magnetorheological seat vibration system was carried out. The seat vibration test system was set up based on the hydraulic shock absorber, linear magnetorheological damper, rotary magnetorheological damper. The studied of vibration damping effect under different excitation input was studied. The results show that, compared with linear magnetorheological damper, considerable effect was achieved with the rotary magnetorheological damper. While the seat vibration system based on the rotary magnetorheological damper has a more compact structure and a lower cost, and has better application prospects.