燃气流量可控的固体火箭冲压发动机动态建模及模型降阶

燃气流量可控的固体火箭冲压发动机促进了其燃气流量控制系统的研究.模型研究是控制系统设计的基础.基于集中参数的思想建立了燃气流量可控的固体火箭冲压发动机动态模型,分析了固体火箭冲压发动机动态模型参数的物理意义及其工作过程中的变参数特性, 固体火箭冲压发动机动态响应时间由冷区容积时间常数、热区容积时间常数、激波传播时间常数和激波容积时间常数等组成, 工作条件的较大变化使得固体火箭冲压发动机在工作过程中具有较强的变参数特性.最后对固体火箭冲压发动机动态模型进行模型降阶,由频率分析的结果可知,模型降阶是合理的.

Dynamic modeling and model reduction order of controllable flow solid ducted rockets

The development of controllable flowsolid ducted rocket promote the study on control system of solid ducted rocket.The control model is the foundation of the control system design.Based on the lumped parameter conception,a dynamic model of the controllable flowsolid ducted rocket is established.The physical meaning of model parameters and the parameter variation characteristics of solid ducted rocket are analyzed.The dynamical response time of solid ducted rocket consistes of the cold volume time,the hot volume time,the shock propagation time and the shock volume time.The wide working conditions make solid ducted rocket possess strong parameter variation characteristics.Finally model reduction order is performed,and the frequency analysis results show that the model reduction order is reasonable.