为实现推力的多变量控制,首先研究了控制系统输出参数选择方法。输出参数选择采用相对增益矩阵(Relative gain array,RGA)和灵敏度分析方法。当RGA对角元趋近1而其他元素较小时,回路之间的耦合小,当输出对输入的灵敏度大时,输出易于控...为实现推力的多变量控制,首先研究了控制系统输出参数选择方法。输出参数选择采用相对增益矩阵(Relative gain array,RGA)和灵敏度分析方法。当RGA对角元趋近1而其他元素较小时,回路之间的耦合小,当输出对输入的灵敏度大时,输出易于控制。为此从常用被控参数中选择低压转子转速与推力构成控制系统输出。由于推力不可测量,采用神经网络对其进行在线估计,神经网络的输入采用遗传算法从航空发动机诸多可测参数中选取。最后设计了H控制器,通过闭环系统仿真,验证了本文方法的有效性。展开更多
A tubular moving-magnet linear oscillating motor（TMMLOM） has merits of high efficiency and excellent dynamic capability. To enhance the thrust performance, quasi-Halbach permanent magnet（PM） arrays are arranged on...A tubular moving-magnet linear oscillating motor（TMMLOM） has merits of high efficiency and excellent dynamic capability. To enhance the thrust performance, quasi-Halbach permanent magnet（PM） arrays are arranged on its mover in the application of a linear electro-hydrostatic actuator in more electric aircraft. The arrays are assembled by several individual segments, which lead to gaps between them inevitably. To investigate the effects of the gaps on the radial magnetic flux density and the machine thrust in this paper, an analytical model is built considering both axial and radial gaps. The model is validated by finite element simulations and experimental results.Distributions of the magnetic flux are described in condition of different sizes of radial and axial gaps. Besides, the output force is also discussed in normal and end windings. Finally, the model has demonstrated that both kinds of gaps have a negative effect on the thrust, and the linear motor is more sensitive to radial ones.展开更多
文摘为实现推力的多变量控制,首先研究了控制系统输出参数选择方法。输出参数选择采用相对增益矩阵(Relative gain array,RGA)和灵敏度分析方法。当RGA对角元趋近1而其他元素较小时,回路之间的耦合小,当输出对输入的灵敏度大时,输出易于控制。为此从常用被控参数中选择低压转子转速与推力构成控制系统输出。由于推力不可测量,采用神经网络对其进行在线估计,神经网络的输入采用遗传算法从航空发动机诸多可测参数中选取。最后设计了H控制器,通过闭环系统仿真,验证了本文方法的有效性。
基金supports of National Basic Research Program of China(973 Program)(No.2014CB046402)National Natural Science Foundation of China(Nos.51620105010,51575019,51675019,51505015)111 Program of China
文摘A tubular moving-magnet linear oscillating motor（TMMLOM） has merits of high efficiency and excellent dynamic capability. To enhance the thrust performance, quasi-Halbach permanent magnet（PM） arrays are arranged on its mover in the application of a linear electro-hydrostatic actuator in more electric aircraft. The arrays are assembled by several individual segments, which lead to gaps between them inevitably. To investigate the effects of the gaps on the radial magnetic flux density and the machine thrust in this paper, an analytical model is built considering both axial and radial gaps. The model is validated by finite element simulations and experimental results.Distributions of the magnetic flux are described in condition of different sizes of radial and axial gaps. Besides, the output force is also discussed in normal and end windings. Finally, the model has demonstrated that both kinds of gaps have a negative effect on the thrust, and the linear motor is more sensitive to radial ones.
