液体火箭纵向耦合振动建模及其动态特性分析

Modeling and dynamic characteristic analysis for longitudinal coupled vibration of a liquid-propulsion rocket

针对液体火箭结构-推进系统的纵向耦合振动问题,建立推进系统各个组件的时域动力学模型,推导出结构-推进耦合系统二阶线性微分方程形式的控制方程。该方法能快速求解得到耦合系统的全部特征值,而且还能在此基础上分析特征值关于蓄压器和泵的物理参数的灵敏度,为液体火箭推进系统的参数优化提供技术手段。

For the problem of structure-propulsion system coupled longitudinal vibration of a liquid-propulsion rocket,dynamic model of each component of the propulsion system was established in time domain.The governing equation of the structure-propulsion coupled system was deduced in the form of second-order linear differential equations. With this method,all eigenvalues of the coupled system were obtained quickly,and their sensitivities with respect to physical parameters of the pressure accumulator and pump were calculated easily.The study results provided a technique for parametric optimization of rockets with liquid-propulsion.