关键词: 液体推进剂火箭发动机;模态区间+;包络线+;仿真

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.

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