Performance seeking control of aero-engine based on nonlinear model prediction
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摘要:
提出一种基于非线性模型预测的航空发动机性能寻优控制方法,以提升性能寻优控制的响应速度。基于风扇进口温度插值的复合推进系统动态模型建模方法建立全包线机载预测模型,以实时估计发动机性能参数及有限时域内的未来输出;基于非线性模型预测控制方法,将最大推力模式、最小油耗模式、最低涡轮温度模式3种性能寻优控制模式转化为实时动态性能寻优问题,并设计相应实时控制的性能指标,提升发动机响应速度。仿真结果表明:相比于传统方法,所提出方法建立的机载模型在3种性能寻优控制模式下有较好的控制效果且响应速度提升0.5~5 s,在高空巡航工作点,最大推力模式下推力提高19.8%,最小耗油模式下耗油率下降3.12%,最低涡轮前温度模式下涡轮前温度下降17 K,验证了控制方法的有效性。
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关键词:
- 航空发动机控制 /
- 非线性模型预测控制 /
- 性能寻优控制 /
- 复合推进系统动态模型 /
- 机载模型
Abstract:To improve the response speed of aero-engine performance seeking control, an aero-engine performance seeking control method based on nonlinear model prediction control was proposed. The full envelope interpolation compact propulsion system dynamic model was used as the on-board model to estimate the engine performance parameters and the future outputs of the limited time domain. With the nonlinear model prediction control method, three typical performance seeking control modes, i.e.: the maximum thrust mode, the minimum fuel consumption mode and the minimum turbine temperature mode were changed into real-time performance seeking, and corresponding real-time control performance indexes were designed to improve engine response speed. The simulation results showed that compared with the traditional method, the proposed control method had better control effect under three performance optimization control modes, and the response speed increased from 0.5 s to 5 s. At the high altitude cruising working point the thrust of the maximum thrust mode increased by 19.8%; the fuel consumption rate of the minimum fuel consumption mode dropped by 3.12%; the temperature of the minimum turbine temperature mode dropped by 17 K, helping to verify the effectiveness of the control method.
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表 1 10个典型工作点
Table 1. Ten typical working points
高度H/km 马赫数Ma 风扇进口总温Tt2/K 0 0 288.15 9 0.8 259.0452 9 0.9 266.8533 9 0.99 274.6660 9 1.05 280.2878 9 1.2 295.7892 9 1.3 307.2717 9 1.4 319.6728 9 1.6 347.2308 9 1.9 395.4573 表 2 PSC约束
Table 2. Constraints of PSC
约束变量 下约束边界 上约束边界 Wfb/(kg/s) 2.8 0.45 dWfb/(kg/s2) −0.02 0.02 A8/m2 0.24 0.32 dA8/(m2/s) −0.005 0.005 Nf/% 102 102 Nc/% 102 102 Smf 0.12 Smc 0.12 T4/K 1 870 -
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