Design of full envelop controller for variable cycle engine based on two-degree-of-freedom H∞ control
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摘要:
将
H ∞鲁棒稳定性理论与经典回路成形理论结合起来,设计二自由度H ∞控制器,同时兼顾了系统的控制性能和鲁棒性要求;为简化控制系统,将内环控制器降为7阶,外环控制器降为4阶;针对全包线大范围跟踪控制问题,在飞行包线内选择18个设计点,并针对不同工作模态和功率水平分别设计控制器,构建增益调度表;选取不同飞行条件进行仿真,由仿真结果可知稳态误差均为0,调节时间均小于2.5 s,验证了全包线H ∞控制器的良好控制性能;最后搭建硬件在环仿真平台对二自由度H ∞控制算法进行验证,结果表明控制算法能够在2 ms内完成计算,且发动机的输出能够快速准确地跟踪参考指令,验证了该算法在硬件环境下的实时性和有效性。Abstract:The
H ∞ robust stability theory was combined with the classical loop shaping theory to design a two-degree-of-freedomH ∞ controller while taking into account both the control performance and robustness requirements of the system; to simplify the control system, the inner-loop controller was reduced to the seventh order, and the outer-loop controller was reduced to the fourth order; for the full envelope wide-range tracking control problem, 18 design points were selected within the flight envelope, the controllers were designed for different operating modes and power levels, and the gain scheduling table was constructed; different flight conditions were selected for simulation, and the simulation results showed that the steady state error was 0 and the settling time was less than 2.5 s, which verified the good control performance of the full envelopeH ∞ controller; finally, the hardware-in-the-loop simulation platform was built to verify the two-degree-of-freedomH ∞ control algorithm. The results showed that the control algorithm can complete the calculation within 2 ms, and the engine output can track the reference instruction quickly and accurately, verifying the real-time and effectiveness of the algorithm in the hardware environment. -
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