ACE thrust maintenance method based on model free adaptive control
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摘要:
自适应循环发动机(ACE)具有很强的非线性特征,参数之间耦合严重,难以建立高精度的数学模型。无模型自适应控制(MFAC)算法无需被控对象的精确模型,仅通过对其输入/输出(I/O)数据进行动态线性化就可以实现控制器的设计,计算负担小且鲁棒性较强。以某型自适应循环发动机为研究对象,设计了针对ACE单一模式的多变量无模型自适应控制策略,并通过引入积分环节,减小被控制量的响应波动并改善其动态性能。针对ACE的推力保持控制问题,分别采用人工蜂群(ABC)优化算法和PID-线性规划(PID-LP)综合优化算法设计外环指令修正回路,搭建双环多变量控制系统,以在实现发动机推力保持的同时,控制涡轮温度和压气机喘振裕度不超过限制边界。基于本文所设计的控制结构及策略,面向工程应用开展了硬件在回路仿真试验。仿真结果表明:本文提出的基于改进的MFAC双环推力控制结构能够使发动机获得良好的稳态和动态控制性能,被控制量的波动量均小于2%,且在气路部件性能退化条件下能实现安全限制范围内的推力保持,从而更好地发挥发动机的性能,延长发动机使用寿命,具有工程应用价值。
Abstract:Adaptive cycle engine (ACE) has strong nonlinear characteristics and severe coupling between parameters. It is difficult to establish high-precision mathematical models. The model free adaptive control (MFAC) algorithm was employed to design a controller by dynamically linearizing its input/output (I/O) data without an accurate model of the controlled object. This algorithm had low computational burden and strong robustness. A multivariable model free adaptive control strategy for ACE single mode was designed based on a certain adaptive cycle engine. By introducing an integral part, the fluctuation of control variables and the dynamic performance of the system were improved. Regarding the thrust maintenance control problem of ACE, artificial bee colony (ABC) optimization algorithm and PID-linear programming (PID-LP) comprehensive optimization algorithm were proposed to design an outer loop instruction correction loop. A dual loop multivariable control system was constructed to control the turbine temperature and compressor surge margin within the limit boundary while maintaining engine thrust. Hardware in-loop simulation tests were conducted. The simulation results demonstrated that the improved MFAC dual-loop thrust control structure enabled the engine to achieve excellent steady-state and dynamic control performance. The fluctuation of the controlled variable remained below 2%, and thrust maintenance within safe limits can be achieved even under conditions of deteriorating gas path component performance. This approach optimized engine performance, extended engine service life, and exhibited significant engineering application value.
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表 1 ACE典型工作模式
Table 1. Typical operation mode of ACE
模式 第二外涵道 第三外涵道 单外涵模式 关闭 关闭 双外涵模式(M1) 关闭 开启 双外涵模式(M2) 开启 关闭 三外涵模式(M3) 开启 开启 表 2 ACE各截面编号及定义
Table 2. Number and definition of each section of ACE
截面编号 截面定义 1 进气道与发动机的交界面 2 可调风扇进口截面 25 高压压气机进口截面 3 燃烧室进口截面 4 高压涡轮进口截面 5 低压涡轮进口截面 6 混合燃烧室进口截面 7 尾喷管进口截面 8 尾喷管喉道截面 9 尾喷管出口截面 -
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