Dynamic Simulation Analysis Of Rigid-flexible Coupling Of A Missile Launcher

The missile launcher is used as a critical equipment which fixes,guides and launchs missiles.Researchers all over the world dedicate to optimize the performance of the launcher to improve the launching precision.The missile launcher is a multi-body system,and the force acting on the system during launching is a dynamic load varying with time,so the initial disturbance of the system will be caused.Therefore,it is of great value to study the dynamic response characteristics of the launcher and improve the firing accuracy of the launcher.In this paper,the missile launcher is theoretically analyzed and simulated.A 3D model of the missile launcher is created based on the dynamic analysis of the model by using the transfer matrix method for multibody system and rigid flexible coupling theory.In ADAMS,the multi-rigid-body model and the rigid-flexible coupling model are respectively established and simulated.Then,the factors affecting the initial disturbance of the missile launcher are studied.This article mainly completes the following work:This paper introduces the research background and significance of missile launch dynamics,and summarizes the research status of missile launch dynamics all over the world.According to the design requirements of the missile launcher,the detailed structural design of the rotary platform,luffing device,electric high-low motor,balancing mechanism and directional motor are carried out.The transmission relationship and operating principle between the components are analyzed and the stability of missile launcher is analyzed.The dynamic modeling and the topological structure diagram of the launcher are built by using the transfer matrix method for multibody system.The transfer matrix and characteristic equation between the components are analyzed and the total transfer equation of the system is derived.Then,the rigid-flexible coupling model of the system is established by analyzing the motion of the flexible body.The dynamic model of multi-rigid body system and rigid-flexible coupling system is established by using ADAMS software and the external motivators which are generated when the missile is launched are added to the model.The dynamic simulation of multi-rigid body system and rigid-flexible coupling system are carried out respectively.Then,the influence of flexible treatment on simulation results is analyzed and studied.Finally,the influence of initial disturbance of the missile launcher,including launch interval,gas flow impact and locking force,on missile launch accuracy are studied.The simulation results show that the larger the launch interval and the smaller the locking force,the smaller the initial disturbance and the higher the launch accuracy.Besides,the model which is added gas flow force can more accurately reflect the actual launching process of the missile.