Ejection Actuation Cylinder Group Dynamics And Ejection Life Calculated

The airborne suspension equipment is the key part of avion. The study of the suspension equipment is made with a lot of man and source to meet Modern air combat in domestic and world. In this thesis, aiming at capability and lifespan problems of ejection ram group in the suspension equipment, the essential study is made to provide the scientific method for the design and lifespan forecast of ejection ram group.The thesis mainly contains:The multi-body dynamic three-dimension simulation analysis model of ejection ram group is made based on software ADAMS according to the configuration of ejection ram group, ejection gas pressure and the work environment. And the kinetic and dynamic calculation of ejection ram group is made based on software ADAMS during the whole ejection process. The data is gotten and analyzed correspondingly such as displacement in whole ejection process and ejection velocity, ejection separation time, ejection acceleration and contact force between the ejection ram group parts under different ejection gas pressure.The FEA (Finite Element Analysis) three-dimension model is made for the deformation and contact pressure analysis of ejection ram group during the whole ejection process. The ejection ram group finite element calculation is made with software ADAMS. The data is gotten and analyzed such as the contact pressure and residual plastic deformation during one whole ejection process and on different ejection gas pressure.The diameter is modified based on the residual plastic deformation in last finite element calculation and the wear value through the calculation using contact pressure. The finite element calculation is made for the ejection lifespan study based on clearance change invalidation. The rule based on the change between ejection times and ejection ram group clearance is gotten under ejection ram group plastic deformation and wear through FEA repetitiously.The dynamic analysis method and FEA method of ejection ram group in the suspension equipment is feasible and available for the calculation of ejection ram group plastic deformation and contact pressure in this paper. The ejection lifespan calculation method and formula based on the change of ejection ram group clearance is worth to be refered. To some extent, the calculation, analysis and results are helpful to the ejection ram group design and engineering application. These can help the future research in theory and application of ejection thin-walled ram group.