Modeling and Simulation of Rigid-flexible Coupling Dynamics of Vehicular Cold Launch System

In order to analyze the influences of long span flexible chassis and lifting auxiliary bracket on the dynamic response of vehicular cold launch system and meet the requirements of fast and accurate simulation, the Cartesian coordinate method is used to describe the motion of the body to fit the characteristics of complex constraints, and then the floating coordinate system method is used to describe the deformation of the flexible body, and the degree of freedom of system is reduced by modal synthesis method. The Hertz contact model is proposed to reproduce the release process of the missile weight. A rapid simulation model of rigid-flexible coupling dynamics of vehicle cold launch system is established. The simulation model is verified by the experimental results based on the launch simulation test system and the simulated results based on a real vehicular cold launch system, and then the rigid-flexible coupling dynamic response analysis is made for the vehicular cold launch system. The results show that the proposed simulation model is able to quickly and effectively analyze the dynamic responses of the launching process of vehicular cold launch systems and meet the requirements of the engineering design, and the flexible chassis model is more reasonable than the rigid chassis model. Furthermore, the singular point of phase portrait of the canister mouth's x-coordinate is a stable focus during the launch process, thus indicating that the vehicular cold launch system can be restored to a stable equilibrium state.