关键词: 液体火箭发动机;故障诊断;知识库

Abstract: A qualitative modeling and diagnosis method was proposed with the integration of time information for the fault diagnosis of liquid-propellant rocket engines. The modeling method is based on the qualitative description of observation and characteristics of engines in the form of predication logic formulae and clauses, and the diagnosis method is based on the inference rules of resolution step and modus ponens. Results verified with the on-fire test data show that the method proposed provides an efficient way easy to represent the dynamic diagnostic knowledge of the test processes. It needs less computation and has better ability in the fault detection and diagnosis in contrast to normal methods.

Key words: Liquid-propellant rocket engine;Fault diagnosis;Knowledge base