Research On The Design And Control Method Of Magnetorheological Fluid Vibration Reduction For Rocket Trolley

The rocket sled,as a ground test facility for high-speed flight along the ground skid,can provide a variety of mechanical environments such as impact and vibration that are much worse than the actual working environment of the test object without taking any technical measures.As the direct carrier of the test object,the rocket sled is designed to reduce the vibration acceleration transmitted by the sled to the test object,ensuring that the vibration acceleration received by the test object during the test is within its true working environment.At present,the rocket sled test platform still adopts passive vibration isolation,which cannot meet the requirements of broadband vibration isolation.Magnetorheological fluid damper is a semi-active control vibration damping device using Magnetorheological fluid as the carrier.Under the influence of external magnetic fields,the rheological properties of Magnetorheological fluid change,which allows the damping force of the damper to be adjusted within a wide range.In this paper,the following aspects of research have been carried out based on magnetorheological fluid dampers:1.The excitation force on the rocket pulley is analyzed,and an attempt is made to use the active vibration isolation of a magnetorheological fluid damper to reduce the vibration of the rocket pulley.Taking the test object of a rocket pulley as the vibration isolation object,a rubber magnetorheological fluid damper based on the extrusion mode was designed.Four working modes of magnetorheological fluid were introduced,and the working principle of the extrusion mode magnetorheological fluid damper was described.The theoretical relationship between the damping force and the current of the extrusion mode magnetorheological fluid damper was derived.2.The magnetic circuit of the magnetorheological fluid damper is simulated to verify the rationality of the magnetic circuit design.At the same time,in order to ensure the maximum controllable performance of the magnetorheological fluid damper,the size of each part of the magnetic circuit is optimized.With the damping force as the optimization goal,the genetic algorithm in the Maxwell parameterized modeling and optimization algorithm library is used to optimize the size of each part of the magnetic circuit of the magnetorheological fluid damper,The magnetic induction strength and damping force of the optimized structure are compared with those of the original structure.The comparison results show that the optimized structure has greater magnetic induction strength and output damping force.A simulation model of the semi active control system for a rocket sled is established.Using PID control method and auto disturbance rejection control method,the vibration reduction effect of the designed magnetorheological fluid damper is simulated using Simulink.The simulation results show that the two control methods designed have good control effects,and the control effect of auto disturbance rejection control is significantly better than PID control.However,the parameter adjustment of auto disturbance rejection control is more difficult than PID control.Therefore,from a comprehensive perspective,both control methods have advantages and disadvantages.4.The performance test of the designed squeeze mode rubber magnetorheological fluid damper was conducted,and the experimental results verified the correctness of the magnetorheological fluid damper and its control method designed in this paper.