root of the characteristic equation meaning in Chinese

特征方程根

This thesis presents an effective way to design pid controller through a combination of adverse deduce and genetic algorithm . the relationship between pid parameter and the root of the characteristic equation of the closed loop control system has been found out directly
本文直接找出pid参数与闭环控制系统的特征方程的根之间的关系，只要使特征方程的根在z平面的单位圆内任意取值，然后再求出相应的pid参数，则闭环控制系统必然是稳定的。
As long as the root of the characteristic equation is within the unit circle of z - plane and the corresponding pid parameter is got , the closed loop control system is sure to be stable . although the root of the characteristic equation can vary within the unit circle of z - plane , different value may affect the control property differently . therefore , it is better to optimize the root , here the optimizing method is carried out by genetic algorithm
本文所采用的这种确定pid参数的方法，虽然可以使特征方程的根在z平面的单位圆内任意取值，但各种取值情况对变风量空调系统的控制品质的影响却不同，因此，要对各种特征方程的根的取值情况进行寻优，本文采用遗传算法对特征方程的根进行寻优，从而使控制器的参数得以优化。