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针对涡扇发动机难以获得精确数学模型和普通模型参考自适应控制不保证动态性能的问题,提出了一种具有改进参考模型的涡扇发动机多变量模型参考自适应控制方法。采用状态反馈形式设计了状态跟踪的多变量自适应控制器,其中对参考模型作了引入跟踪误差反馈的改进,使得高自适应增益下跟踪曲线的超调得到明显的抑制,动态响应得到改善。应用该方法对涡扇发动机非线性部件级模型进行仿真分析,结果表明,控制系统调节时间小于2s,无稳态误差,具有良好的控制品质。 相似文献
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A novel model-based multivariable framework for aircraft gas turbine engine limit protection control
《中国航空学报》2021,34(12):57-72
Control technologies are innovated to satisfy increasingly complicated control demands of gas turbine engines. In terms of limit protection control, a novel model-based multivariable limit protection control method, which is achieved by adaptive command reconstruction and multiple-control loop selection and switch logic, is proposed in this paper to address the problem of balancing smaller thrust loss and safe operations by comparing with widely-used Min-Max logic. Five different combination modes of control loops, which represent the online control loop of last time instant and that of current time instant, is analyzed. Different command reconstructions are designed for these modes, which is based on static gain conversion of amplitude beyond limits by using an onboard model. The double-prediction based control loop selection and switch logic is developed to choose a control loop appropriately by comparing converted amplitude beyond limits regardless of one or more parameters tending to exceed limits. The proposed method is implemented in a twin-spool turbofan engine to achieve limit protection with direct thrust control, and the loss of thrust is improved by about 30% in comparison with the loss of thrust caused by Min-Max logic when limit protection control is activated, which demonstrates the effectiveness of the proposed method. 相似文献
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本文使用状态转移矩阵与积分型级数解表达式,推出了线性时变系统外干扰完全补偿原理表达式,此式简单、精确,便于终端关机方程使用,文中并给出了一组初值t_p,Ψ可变动的伴随函数解析解表达式。 相似文献
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根据磁力矩在地磁场中的定向阻尼特性,提出了磁控重力梯度和有阻尼器的非重力梯度卫星姿态控制律。给出了卫星姿态运动方程,并证明采用两种方法控制卫星姿态的稳定性。根据地磁场强度变化规律选择控制系数。理论分析和仿真结果表明,基于磁力矩定向阻尼特性的卫星姿态磁控制方法简单、精度较高。 相似文献