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本文利用CAD技术,绘出了液压闭环伺服系统中最典型的一大类问题的参数平面根区图。该图比梅里特绘出的图更为简便直观,而且可推广应用于分析任何三阶系统(包括数字控制系统)。文中绘出了CAD作图原理,并讨论了对象开环参数变化对闭环极点的影响。该图特别适用于研究系统的鲁棒性,即对象的一个或多个参数同时变动后闭环系统的功志之化,其简明直观的功能是根轨迹等分析方法难以比拟的。
In this paper, we use CAD technology to plot the parameter root plane map of the most typical large-scale hydraulic closed-loop servo system. This map is much easier and more intuitive than the map plotted by Merritt and can be generalized to any 3rd order system (including digital control systems). The paper draws the principle of CAD drawing, and discusses the influence of the change of open-loop parameters on the closed-loop poles. The graph is especially suitable for studying the robustness of the system, that is, the closed-loop system’s dedication after one or more parameters of the object change simultaneously. Its concise and intuitive function is unmatched by analysis methods such as root locus.