摘要
涡扇发动机动态特性在节流状态下随着转速和飞行条件的变化呈现强非线性,定参数PID控制器难以保证全包线节流状态的控制性能。针对该问题,提出相似模糊PI控制器实现包线节流状态的稳定跟踪控制。针对发动机设计点转速特性,建立PI控制器参数调整规则,利用模糊规则增强PI控制器的适应性,并引入遗传算法优化模糊系统的论域边界。为克服包线特性变化,利用发动机在相似坐标系中特性相近的特点,采用相似变换自适应调整包线内工作点的模糊论域边界,减少包线内论域参数整定的工作量。针对包线内不满足相似原理的工作点,修正相似变换后的控制器参数。应用所设计的控制器于某型涡扇发动机并开展数字仿真。仿真结果表明该控制器可保证发动机节流状态下转速跟踪性能,系统输出响应速度快,无超调,具有一定的工程实用性。
The variation of engine dynamic characteristics is strongly nonlinear due to speed characteristics and envelope characteristics.It is hard for a fixed parameter PID to guarantee the control performance in the full envelope under throttle operating conditions.For the above mentioned problems,the collaboration of an optimal fuzzy PI con trol and the similar theory was proposed for aircraft engines.Considering the design point of aircraft engines,the rules of parameter adjustments were established to enhance the adaptability of the PI control,and the genetic algo rithm was used to optimize the domain bounds of the fuzzy inference system.In order to conquer the variation of dy namic characteristics in the envelope,by the similar characteristics of engines in a similar coordinate system,the similarity transformation was adopted to adaptively schedule the domain bounds of operating points and reduce the pa rameter setting workload in the envelope.Further considering operating area in the flight envelope where the principle of similarity is not satisfied,a coefficient correction method was employed to enhance the controlled system perform ance.The new fuzzy PI control was applied to a turbofan engine.The computer simulation results show that the new control guarantees the system performance,the output can track the command signal quickly and has no overshoot,which has attractive engineering practicability.
作者
顾彬斌
潘慕绚
黄金泉
GU Bin-bin;PAN Mu-xuan;HUANG Jin-quan(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing Jiangsu 210016,China)
出处
《计算机仿真》
北大核心
2019年第6期49-54,共6页
Computer Simulation
基金
江苏省航空动力系统重点实验室基金(NJ20160020)
关键词
涡扇发动机
节流状态
模糊比例积分控制
遗传算法
相似理论
Aircraft engine
Throttle operating condition
Fuzzy PI control
Genetic algorithm
Similarity theory
