This paper presents the analysis of open microstrip structures by using diakoptic method of lines (ML) combined with periodic boundary conditions (PBC). The parameters of microstrip patch are obtained from patch curre...This paper presents the analysis of open microstrip structures by using diakoptic method of lines (ML) combined with periodic boundary conditions (PBC). The parameters of microstrip patch are obtained from patch current excited by plane wave. Impedance matrix elements are computed by using fast Fourier transform(FFT), and reduced equation is solved by using diakoptic technique. Consequently, the computing time is reduced significantly. The convergence property of simulating open structure by using PBC and the comparison of the computer time between using PBC and usual absorbing boundary condition (ABC) show the validity of the method proposed in this paper. Finally, the resonant frequency of a microstrip patch is computed. The numerical results obtained are in good agreement with those published.展开更多
快反镜作为高精度光学系统的核心执行机构,其控制策略的优劣直接影响系统性能。传统的快反镜控制策略依赖独立的控制盒和线性功放模块,导致快反镜控制系统体积大、热量高、应用受限。而基于金属-氧化物半导体场效应晶体管(metal-oxide-s...快反镜作为高精度光学系统的核心执行机构,其控制策略的优劣直接影响系统性能。传统的快反镜控制策略依赖独立的控制盒和线性功放模块,导致快反镜控制系统体积大、热量高、应用受限。而基于金属-氧化物半导体场效应晶体管(metal-oxide-semiconductor field-effect transistor,MOSFET)开关量驱动的快反镜在控制上难以达到精度要求。通过对快反镜的建模扫频分析,提出了开环零极点配置与比例积分控制(proportional integral derivative,PID)相结合的控制策略,并在快反镜的硬件平台上进行了仿真验证。实验结果表明,该控制策略在不依赖额外控制器和驱动模块的前提下,能够保证快反镜控制的高精度要求。展开更多
基金Supported by the National Natural Science Foundation of China
文摘This paper presents the analysis of open microstrip structures by using diakoptic method of lines (ML) combined with periodic boundary conditions (PBC). The parameters of microstrip patch are obtained from patch current excited by plane wave. Impedance matrix elements are computed by using fast Fourier transform(FFT), and reduced equation is solved by using diakoptic technique. Consequently, the computing time is reduced significantly. The convergence property of simulating open structure by using PBC and the comparison of the computer time between using PBC and usual absorbing boundary condition (ABC) show the validity of the method proposed in this paper. Finally, the resonant frequency of a microstrip patch is computed. The numerical results obtained are in good agreement with those published.
文摘快反镜作为高精度光学系统的核心执行机构,其控制策略的优劣直接影响系统性能。传统的快反镜控制策略依赖独立的控制盒和线性功放模块,导致快反镜控制系统体积大、热量高、应用受限。而基于金属-氧化物半导体场效应晶体管(metal-oxide-semiconductor field-effect transistor,MOSFET)开关量驱动的快反镜在控制上难以达到精度要求。通过对快反镜的建模扫频分析,提出了开环零极点配置与比例积分控制(proportional integral derivative,PID)相结合的控制策略,并在快反镜的硬件平台上进行了仿真验证。实验结果表明,该控制策略在不依赖额外控制器和驱动模块的前提下,能够保证快反镜控制的高精度要求。
