摘要
某固体火箭发动滚动球窝喷管结构设计,必须保证在承受极端工作载荷时,系统满足最大摆角要求,摆心漂移及作动力矩皆在设计许可范围内。系统摆动中,其接头内部,滚动体与阴、阳球及保持架接触碰撞,各构件运动状态复杂。为解决决定系统结构设计和功能发挥的摆动性能这一关键问题,用并联非线性弹簧阻尼器,模拟滚动体与保持架间的弹性碰撞;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、阳球间的弹塑性接触模型;基于第一类Lagrange动力学方程,建立冷试车状态系统刚柔耦合多体动力学模型。计算分析系统摆动规律、摆心漂移及作动力矩。通过与系统冷试车及发动机热试车试验所测力矩的对比论证,检验系统结构设计、动力学建模及计算结果的正确性。
When designing the structure of a certain solid propellant rocket motor＇s rolling ball joint socket nozzle, the maximal swing angle, the excursion of swing center, and the driving moment must be within the design limits permitted, and moreover, system must bear the extreme working loads. Motion state of system components is complicated because of the contact and the collision among the rolling ball, convex sphere, concave sphere and the separator. To solve the key problem of the contact load-bearing property which decides the design of the system structure and functions into play, the elastomeric collision between the ball and the separator in the joint is simulated as a parallel nonlinear spring damper, and the mode flexibility of convex sphere and concave sphere are described by the ~mite element method model. At the same time, the elastic contact model between the rolling ball and the convex-concave sphere model is established by introducing the calculation result of the elastic-plastic frictional contact deformation. The rigid and flexible coupled multi-body dynamics model of the system is established based on the ~1rst kind of Lagrange dynamics equation. The swing disciplinarian, excursion of swing center and driving moment of the system are calculated and analysed. By contrast with the torque measured of the pendulous test and ignition test, the structural design of system, the dynamic modeling method and its result＇s rationality are examined.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2013年第13期93-99,共7页
Journal of Mechanical Engineering
基金
内蒙古人才开发基金
内蒙古自然科学基金(2013MS0710)资助项目
关键词
固体火箭
滚动球窝喷管
动力学分析
摆动性能
冷试车试验
热试车试验
Solid propellant rocket Rolling ball joint socket nozzle Dynamics analysis Swing performance Pendulous testIgnition test
