考虑寿命的航空发动机最优加速控制规律研究

Aircraft Engine Optimal-Acceleration Schedule Design Combined with Life Factor

传统航空发动机控制主要考虑在安全可靠前提下保证发动机性能,而延寿控制则通过适当修改加速控制规律,使发动机寿命得到大幅度延长,同时加速性能不变或略有可接受的降低。针对加速控制规律最优化设计中所遇到的求解问题,以某型涡扇发动机涡轮导向叶片的热机械疲劳寿命为例,提出采用动态稳定法来解决给定寿命因素约束条件下的最优加速控制规律设计。仿真结果表明,所设计的加速控制规律充分挖据了发动机加速性能潜力,又保证了叶片热机械疲劳损伤的极限情况,是最优的;通过略微牺牲发动机加速性能的情况下,可明显延长叶片的工作寿命。

Traditional aircraft engine control aims to provide desired performance based on stability margins while life extending control（LEC） means to change the original control schedule to maintain the performance of engine and extend engine life. Aiming at the global optimum issue of aircraft engine optimal-acceleration schedule design com- bined with life factor, considering a turbofan engine thermal - mechanical fatigue （TMF） of turbine stator blades as an example, the optimal-acceleration schedule was designed under the constraints of life factors via fixed dynamic method. Simulation results show that, the acceleration schedule is optimal, and the blades life can be significantly extended in the case of slightly sacrificing the engine acceleration performance.