摘要
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。
Up to now, Mining machinery and equipment update speed, The equipment using the device about Nyquist theorem are using Nyquist curve and logarithmic frequency characteristic curve to determine the stability of the closed-loop system, but they did not give the complete drawing method of the metioned 2 types of curves when the open-loop system containing unstable elements. And chances are that the control system will have many unstable elements. Then if we still use the previous drawing method to determing the stability of the system by using the Nyquist theorem, the following conclusion will be incorrect. After years of research and exploration, we proved the complete drawing method of the former 2 curves from the theory and practice of the open-loop system with stable links. And at the same time the method is slightly improved in order to include the complete drawing of Nyquist curve for discrete control systems with unstable segments.
出处
《煤炭技术》
CAS
北大核心
2014年第2期158-161,共4页
Coal Technology
