关键词: 液体推进剂火箭发动机;转子转速;模糊数学;可靠性设计

Abstract: The determination of critical rotation speed of turbopump rotor or the transition of operating rotation speed from admissible to inadmissible,or the rotor condition changing from normal to fault,are evolutional process,namely,fuzzy events.Aiming at the feature of resonance of the rotor,the fault membership function of the working state is analyzed.The determination of related parameters in the membership function is discussed particularly.The fuzzy reliability computing model of working rotation speed of the rotor is set up.The computing formula of the working rotating speed is derived and compared with the usual determing method

Key words: Liquid propellant rocket engine;Speed of rotation;Fuzzy mathematics;Reliability design