某型号固体火箭发动机推力矢量控制系统接触承载性能分析  

Contact Load-bearing Performance Analysis for Thrust Vector Control System in a Certain Solid Propellant Rocket Motor

作　　者：刘文芝[1] 黄科[1] 武建新[1] 滕人超[1] 赵永忠 

机构地区：[1]内蒙古工业大学机械学院,呼和浩特010051 [2]中国航天科工集团第六研究院41所,呼和浩特010010

出　　处：《机械工程学报》2012年第19期148-155,共8页Journal of Mechanical Engineering

基　　金：国家自然科学基金(50965013);内蒙古自然科学基金(2009BS0702)资助项目

摘　　要：某型号固体火箭发动机推力矢量控制系统的结构设计,必须保证在承受极端工作载荷时,喷管不能有大的轴向位移,阴、阳球与滚动体间具有一定的接触强度,同时不产生过量的塑性变形,属于复杂结构在复杂载荷作用下的弹塑性摩擦接触问题,无法解析计算且无法试验测量。为解决决定系统结构设计和功能发挥的接触承载性能这一关键问题,模拟系统冷试车试验,充分考虑材料表面强化层,建立各构件间的弹塑性摩擦接触模型。基于计算精度高的三维摩擦接触问题的Lagrange乘子法,解决了与弹塑性耦合的有限元计算问题。计算分析喷管位移,阴球、阳球与滚动体间的接触应力、摩擦应力、变形分布及材料破坏机理。通过与冷试车试验结果的对比分析,检验系统接触承载性能、有限元法及结果的正确性。为该型号推力矢量控制系统的设计提供一种更为高效、精确的计算方法。When designing the structure of a certain solid propellant rocket motor＇s thrust vector control system,the designer must make sure if it bears the extreme working loads,the nozzle should not have the large axial displacement,and there must be the certain contact strength between the concave-convex sphere and rolling element,meanwhile do not produce excess plastic deformation.It is an elastic-plastic frictional contact problem of a complex structure which can not calculate and measure under complex loads.To solve the key problem of the contact load-bearing property which decides the design of the system structure and functions into play,the pendulous test of the system is simulated and the elastic-plastic frictional contact model between all the components concerning the surface intensify layer is established.The nozzle＇s displacement,stress,deformation distribution and the destruct principle of joint material between the concave sphere-convex sphere and rolling element are calculated and analyzed.The problem of elastic-plastic coupling＇s finite element calculation is solved by high-precision 3D friction contact method with Lagrange multipliers.By contrast with the pendulous test results,system contact load-bearing performance,finite element method and its result＇s rationality are examined,and provide a more efficient and precise calculation method for designing this type of thrust vector control system.

关 键 词：固体火箭发动机 推力矢量控制系统 弹塑性摩擦接触有限元法 接触承载性能 冷试车试验 

分 类 号：TH122[机械工程—机械设计及理论]