论文部分内容阅读
近年来,矿区机械设备更新速度加快,其中矿区使用的设备涉及自动奈奎斯特曲线(简称“奈氏”曲线)及其对数频率特性曲线来判断闭环系统的稳定性时,均没有指出过开环系统含有不稳定环节时以上2种曲线的完整画法,而控制系统中不乏有不稳定环节。此时沿用以往的方法画的以上2种曲线,再用奈氏定理的稳定判据来判断系统的稳定性,会得出错误的结论。经过多年的研究探索,从理论和实践上证明了开环系统含有稳定环节时,以上2种曲线的完整画法。同时,稍加改进,也能包揽离散控制系统含有不稳定环节是奈氏曲线的完整画法。
In recent years, mining machinery and equipment to speed up the update, which mining equipment used in the automatic Nyquist curve (referred to as “Naisi” curve) and its logarithmic frequency characteristic curve to determine the stability of the closed-loop system, no Pointed out that the open-loop system contains unstable links above two kinds of curves of a complete drawing, and there are many control system instability. At this point follow the previous method of drawing the above two kinds of curves, and then use the stability criteria of the Neisch’s theorem to determine the stability of the system will come to the wrong conclusion. After many years of research and exploration, it is proved theoretically and practically that when the open-loop system contains stable links, the above two kinds of curves are completely drawn. At the same time, a slight improvement, but also to take control of discrete systems containing the unstable part of the Najen curve complete drawing.