模态区间方法在液体火箭发动机系统仿真中的应用

Modal intervals-based system simulation and application for liquid propellant rocket engine

关键词:  液体推进剂火箭发动机  模态区间+  包络线+  仿真

Key words:  Liquid propellant rocket engine  Modal interval~+  Envelope curve~+  Simulation

摘要:

模型简化和系统参数的不确定性导致基于定量模型的液体火箭发动机仿真结果与系统的真实行为存在差异。利用模态区间分析方法对系统进行仿真,得到的结果为一包含系统真实行为的包络线,它是系统真实行为区间的优化。通过对某泵压式液体火箭发动机稳态工作过程的模态区间仿真计算,证明模态区间分析方法对复杂动态系统建模仿真是有效的。

Abstract:

The quantitative models of liquid propellant rocket engine were simplified and can not represent some uncertainties in the real system.Hence the simulated behavior obtained by of these models is different from the real one.An interval model can express the imprecision and the uncertainty.The method of modal interval analysis is used to simulate the behavior of the system.The result of the simulation of modal intervals-based models can be represented in the form of envelope in which the real behavior of the systems is included.The envelope of the behavior is an interval optimal of the real one.The simulation results of liquid propellant rocket engine demonstrate that modal interval analysis is effective to complex dynamic systems.