Research On High-speed Transient Damping Characteristics Of Eddy Current Dampers

Eddy current damper(ECD)is a promising device for dissipating kinetic energy in dynamic systems.Taking the eddy current damper under strong impact load as the research object,this paper is conducted to analyze its transient damping characteristics under highspeed condition.The variation law of the resistance provided by the eddy current damper used for weapon launching is analyzed.The finite element simulation model for the eddy current damper under impact load is established,and an eddy current damper impact loading test device was built to verify the correctness of the FEM.The test results are in good agreement with the simulation results.The change of damping coefficient with speed when the mover was moving at high speed was analyzed.The focus is on the analysis of the high-speed transient damping characteristics of the eddy current damper under the weapon launching load.The finite element method is used to analyze the eddy current skin and demagnetization effects of the eddy current damper during operation.The critical velocity in recoil motion and the "saddle" feature in the recoil resistance curve are analyzed.The influence of key structural parameters of the eddy current damper on the recoil braking performance of the eddy current damper is analyzed.BP neural network and genetic optimization algorithm are used to optimize the structure of the eddy current damper to weaken the "saddle" feature in the recoil resistance curve and enhance the resistance platform effect.The research results show that the eddy current damper has a good braking performance and has important application value in the field of impact braking such as weapon launching.The results show that the recoil resistance of ECD under weapon launching load is highly nonlinear at high recoil velocity and self-limiting as a function of recoil velocity.It increases with recoil velocity at first,but after reaching a maximum at a critical velocity it decreases for higher recoil velocity.The recoil resistancerecoil braking displacement curve shows an increase-decrease-increasing shape like a "saddle",which is unfavorable for the gun firing stability.The recoil resistance curve before optimization fluctuates greatly.The "saddle" shape is basically eliminated in the optimized recoil resistance curve,and the damping force platform effect is enhanced.The optimized maximum recoil displacement has been reduced by 2.2%,the two peaks of the "saddle" resistance curve have changed by 1.4% and 3.0% respectively,and the recoil resistance valley has increased by23.98%.The recoil resistance filling degree is increased from 87.32% to 93.44%.The demagnetization effect is effectively weakened.The performance of the eddy current damper was optimized and improved,and the stability of the artillery during weapon launching is improved.The results show that the optimization objectives,optimization variables and optimization methods selected in this paper are feasible and the optimization effect is obvious.