液体火箭发动机故障特性动态模拟

以某大型泵压式供应系统液体火箭发动机为研究对象, 建立了液体火箭发动机非线性动态数学模型。针对已发生过或可能出现的故障形式, 以阶跃形式输入, 进行了故障状态下动态特性模拟。数值方法用四阶定步长龙格-库塔方法发展而成的自适应变步长龙格-库塔法。计算结果表明, 所建模型较精确合理, 数值方法满足故障模拟的要求。该工作为故障模式提取、监控参数优化选择、基于模型的故障检测与诊断等发动机健康监控问题的研究奠定了基础。 

TRANSIENT PERFORMANCE SIMULATION OF A LARGE LIQUID ROCKET ENGINE UNDER FAULT CONDITIONS

A non linear dynamic mathematical model for a large liquid rocket engine has been established,which comprises normal models and fault models based on large liquid rocket engine with turbo pump system.The transient performance simulation has been performed under fault conditions according to jump input of various fault modes such as main valve fault,pipeline leakage,pipeline blockage,pump efficiency losses,turbine efficiency losses,which have occurred in previous hot fire tests or will be possible to occur in future.Adaptive Runge-Kutta method is employed to simulate.The calculated results show that the established model is accurate and reasonable.The numerical method can simulate effectively the transient performance of the faults.Simulation results are also discussed and analysed in detail.The work lays the foundation for further study on choice of fault modes,fault detection and diagnosis based on the model.