吸气式发动机冲压模态燃油/喷管容错控制计划研究

Fault Tolerant Control Plan of Fuel/Nozzle in Ramjet Mode of Air Breathing Engine

关键词:  涡轮基组合循环发动机  容错控制  激波裕度  推力状态控制  控制计划

Key words:  Turbine based combined cycle engine  Fault tolerant control  Shock wave margin  Thrust state control  Control plan

摘要:

针对推力状态控制时执行机构传感器发生故障影响发动机安全运行的问题，提出了一种非相似容错控制计划。该方法将燃油闭环/喷管开环和喷管闭环/燃油开环两种控制计划互为备份，并结合一种惯性切换逻辑，在执行机构传感器发生故障时切换控制计划以保障发动机的安全运行。面向串联式TBCC（Turbine Based Combined Cycle）发动机的冲压模态开展了仿真验证，结果表明，该容错控制计划能够实现发动机全包线范围内的推力状态容错控制，并且在传感器发生故障时能够平稳切换，推力波动小于1%，增强了控制系统的容错性。

Abstract:

A dissimilar fault-tolerant control plan is proposed to address the problem that an actuator sensor failure affects the safe operation of the engine during the thrust state control. In this method， the fuel closed-loop / nozzle open-loop and nozzle closed-loop/fuel open-loop control plans are backed up to each other， and combined with an inertial switching logic， the control plan is switched to ensure the safe operation of the engine when the actuator sensor fails. The simulation verification is carried out for the ramjet mode of tandem TBCC engine. The results show that the fault-tolerant control plan can realize the fault-tolerant control of thrust state in the whole envelope of the engine， and can switch smoothly when sensors fails， thrust fluctuation is less than 1%， which enhances the fault tolerance of the control system.