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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。
Taking a large-scale liquid-propellant-powered liquid propellant rocket engine as the research object, a nonlinear dynamic mathematical model of the liquid propellant rocket engine is established. In the form of a fault that has occurred or may occur, a step-by-step input is made to simulate the dynamic behavior of the fault. A Numerical Method Based on Fourth Order Stepped Runge - Kutta Method to Develop Adaptive Step - Size Runge - Kutta Method. The calculation results show that the model is more accurate and reasonable, and the numerical method can meet the requirements of fault simulation. This work lays the foundation for the research on the problem of engine health monitoring, such as fault pattern extraction, optimization of monitoring parameters, model-based fault detection and diagnosis.