Non-linear Dynamics Simulation And Stability Analysis Of Fast Launch Platform

The unsupported random launching technique is a very important way to fast-launch for land-based mobile missiles.This paper aims at the vehicle missile weapon system,and points to improve the stability of the missile weapon system in the launching process and to reduce the initial disturbance at the time of the missile launching in the box.The dynamic response characteristic analysis and parameter optimization of the launching process are carried out.Firstly,taking the typical vehicle missile weapon system as the research object,the nonlinear finite element model of missile launch system is established by finite element method for the strong nonlinear characteristics of missile launching process.The finite element model of the missile launch system is established by the finite element method.Secondly,based on the analysis and calculation of the missile launching dynamics model,the stability of the launching system under different support modes and the initial disturbance size of the missile are compared and analyzed.The result shows that,the different supporting modes have certain effects on the stability of missiles,but they can achieve the missile’s safe launching and the stability of the launching system is better under the hybrid support mode.The influence of the load distribution ratio of the legs and the tire with the hybrid support mode on the launching process is analyzed and calculated,which provides a basis for the selection of the load distribution ratio of the hybrid support.Finally,based on the finite element model of the missile launching system,the influence of the mechanical characteristics of the asphalt road and the slope degree of the launching field on the dynamic response of the launching system and the attitude of the missile out of the box are studied.Using ABAQUS to establish pavements’ FEM model with Druker-Prager/Creep.In view of the asphalt road,the influence of the floor surface thickness and the elastic modulus of the field surface layer on the launching process are studied,and the dynamic response characteristics of the field are analyzed.In view of the asphalt concrete apron,the influence of the thickness of field surface layer and the elastic modulus of flat surface layer on the launching process is studied,and the dynamic response characteristics of the field is analyzed.The dynamic response of missile launching at different lateral gradient and longitudinal gradient are studied,and the influence of slope on the launching stability of missile is analyzed,and the response of launch system under the same transverse and longitudinal slope are compared and analyzed.The results present that the greater the slope of the pavement is,the worse the missile launching stability is,and the impact of the longitudinal slope on the missile launching dynamic response is smaller than the horizontal slope under the same pavement slope,which provides a reference for the selection of unsupported field flat.