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针对目前零阶保持器幅频特性只给出理论性的分析,以及一般性的结论,分析较模糊,提出了基于Padé近似法的零阶保持器幅频特性仿真。该方法对零阶保持器的传递函数进行了改进,得到了分子与分母同阶次的有理传递函数。通过MATLAB控制系统工具箱提供的freqs()以及nyquist()函数,绘制了幅频特性曲线以及奈奎斯特图;并对其进行了详细的分析。对零阶保持器幅频特性仿真结果表明:运用该方法得到的结果与理论性分析的结论一致,解决了目前未能清晰直观的展示零阶保持器幅频特性变化的问题,同时零阶保持器具有低通以及相角滞后的特性。
Aiming at the theoretical analysis of amplitude-frequency characteristics of zero-order retainer and the general conclusion, the analysis is fuzzy, and the amplitude-frequency characteristic simulation of zero-order retainer based on Padé approximation is proposed. This method improves the transfer function of the zero-order retainer, and obtains the same rational transfer function between the numerator and the denominator. The freqs () and nyquist () functions provided by the MATLAB control system toolbox were used to draw the amplitude-frequency characteristic curve and the Nyquist plot. The detailed analysis was carried out. The simulation results of the amplitude-frequency characteristics of the zero-order retainer show that the results obtained by this method are consistent with the conclusions of the theoretical analysis, which solves the problem that the amplitude-frequency characteristic of the zero-order retainer can not be displayed clearly and intuitively at the moment, The device has low-pass and phase-delayed characteristics.