| Vibration can weak mechanical parts and damage mechanical performance of the system, the shock absorber are more and more important, especially in the vehicle, people have higher requirements to the comfort of automobiles. Passive control has been difficult to meet the requirements of people. With the discovery of magnetorheological effect, magnetorheological semi-active damper has gradually become a hotspot of research on this field. The magnetorheological damper has good stability, strong controllability, simple structure and fast response, which is the ideal choice for vehicle shock absorber. Whether in suspension, seat, engine mounting, magnetorheological damper has been widely used in v ehicles.(1) According to the requirements of a car suspension shock absorber, this paper chooses a suitable MRF materials, designs the structural parameters of magnetorheological damper, and calculates the damping characteristics, such as ower output, adjustable coefficient, damping force, magnetic resistance size, response time and so on.(2) According to the design of structure parameters of magnetorheological damper, and establishment of the structure model and electromagnetic simulation analysis, dissertation studies the effect of the change of the different structure size of the agnetorheological damper to the magnetic induction intensity of damp channels, figures out the sensitivity of the influence of each structural parameters and compares the magnetic field of single and double coil.(3) To improve the damping properties of the design of magnetorheological damper, genetic algorithms is used to optimize the structural parameters of damper. Under meeting the limiting condition of the output da mping force and volume requirements, the adjustable damping force coefficient and coil powe of the MR damper have been optimized. Electromagnetic simulation is used to verifies whether the size of the magnetic induction intensity of the various area mee t the requirements. The simulation results show that the optimized magnetorheological damper can meet the design requirements and has good vibration performance. |
