Study On Coupled Effects Of Missile Launcher And Unsupported Random Launching Site In Launching Processing

Unsupported random launching technique is a very important way to fast-launch for land-based mobile missiles. It can greatly improve the randomness, mobility and concealment of launching, thus promoting the survivability of missile system. This paper focuses on coupling effects of vehicle-mounted missiles and launch site during launch, which would help to select unsupported random launch site and ensure better security. The contribution of the paper is as follows.(1) Mathematical theory foundation were elaborately discussed including modeling and numerical solution in multi-body system dynamics based on Lagrange equations of the first kind, and computing method of contact force in Impact-function-based model. Therefore, the vehicle-mounted missile system and launch dynamic model have been established.(2) A background about the unsupported random launch site was present, and the theory of elastic half-space and layer system was discussed. After analyzing the shortcoming of computing equivalent modulus in standard elastic system, a new method has been devised according to the features of contact between launch equipment and launch site. It considers layer system equivalent to double-layer system, verified to be right by numerical examples. Massive calculation data were fit to derive the regression formula of computing equivalent modulus of launch site. Normal directional and tangential directional dynamic models were built up on a basis of equivalent modulus of launch site. The thin plate model on elastic halfspace foundation was built in normal direction and the double-layer elastic system model was built in tangential direction; their integral analytical solutions were also deducted. Validity of the model was proved by comparing the programming calculation with the finite element numerical simulation in certain cases.(3) An introduction of the constitution and the topology about vehicle-mounted missile system was briefly present. Lumped parameter model of multi-stage hydraulic cylinder was build up based on studying friction force and collision force in cylinders. Considering the effect of flexibility of launch equipment and wind load, a flexible multi-body dynamic model of missile system was built in ADAMS. Coupling effect between missile system and launch site contains displacement compatibility and mechanical coupling. The expression of normal and tangential directional contact force are derived. Based on the above works a coupling computing calculation in MATLAB and ADAMS was presented. Finally, the effect of launch site parameters on missile erecting was analyzed with the dynamic simulation of the vehiclemounted missile system.(4) The process of pressing concrete panels was analyzed to set up evaluation index for concrete site. Missile system with flexible launch site has been modeled and simulated, taking into account of tension and compression of cylinders and incentive load, including ejection force, additional load and so, in the launch. The effect of thickness and elasticity modulus of concrete plate on launch was analyzed elaborately. To study the damage process of concrete plate, damage factors of tension and compression have been derived; a structural dynamic model was built in ABAQUS. Finally four kinds of typical launch sites have been simulated with finite element method, to study their capacities and the corresponding influencing factors. It offers valuable reference for the selection of launching site and the design of weapon system.