滚动球窝喷管动态性能分析

Dynamic Characteristics Analysis of Rolling Ball Joint Socket Nozzle

关键词:  固体火箭发动机  滚动球窝喷管  刚柔耦合多体动力学  动态性能  冷试车试验 

Key words:  Solid propellant rocket motor  Rolling ball joint socket nozzle  Coupled rigid and flexible multi-body dynamics  Dynamic characteristics  Pendulous test

摘要:

为检验极端载荷作用下,固体火箭发动机滚动球窝喷管动态性能及结构设计的正确性,理论计算中,接头内部,用并联非线性弹簧阻尼器,表征滚动体与保持架间的刚性碰撞；用有限元法为数学工具,以阴、阳球的模态柔性描述其弹性,同时引入弹塑性摩擦接触变形的数值计算结果,建立滚动体与阴、阳球间的弹性接触模型；充分考虑各构件的重量、转动惯量、材料特性及摩擦,建立系统整机刚柔耦合多体动力学模型。计算得到系统及接头内各主要零部件的运动规律、动态接触力、系统摆心漂移量及瞬时作动力矩。通过与系统冷试车试验所测力矩的对比论证,检验动力学建模方法及计算结果的合理性、正确性。

Abstract:

In order to test the correctness of the dynamic performance and structural design for rolling ball nozzle solid rocket motor in extreme load condition, the finite method was adopted in theoretical calculation. Inside the system joint, the rigid crash between the ball and the separator in the joint was simulated as a parallel nonlinear spring damper, and to flexibly describe its elasticity by the convex-concave model. At the same time, the elastic contact model between the rolling body and the convex-concave sphere model was established by introducing the calculation result of the elastic-plastic frictional contact deformation. In consideration of the weight, moment of inertia, material characteristics and friction of the mechanism, coupled rigid and flexible multi-body dynamics model of complete machine was established. Movement disciplinarian, dynamic contact force, excursion of sway center and instantaneous driving moment of mechanism components were obtained. The comparison is made between the measurement and the simulated results.The rationality and validity of the dynamics modeling methods and the calculation results were validated. 