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在自动调节系统中,我们总是认为调节器的比例度P愈大,系统愈稳定,P愈小,系统愈容易振荡,因而愈不稳定;积分作用愈强,即积分时间T_i愈小,系统振荡愈剧烈。但是,在实际应用中,我们往往忽略了这个结论的前提条件——对二阶系统而言。如果是三阶或三阶以上的系统、含有纯滞后环节的系统图一或图二其根轨迹将出现图三或图四所示的形状(如果三阶系统的开环传递函数GH=G_c(S)·G_v(S)·G_o(S)·G_m(S)有一个零点,则系统的根轨迹就
In the automatic adjustment system, we always think that the greater the proportion of the regulator P, the more stable the system, the smaller the P, the system more prone to oscillation, and therefore the more unstable; the stronger the integral effect, the smaller the integral time T_i, the system The more severe oscillation. However, in practical applications, we often overlook the precondition of this conclusion - for the second-order system. In the case of a system of third order or higher order, the shape of the root locus in Figure 1 or Figure 2 containing the pure hysteresis will appear as shown in Figure 3 or Figure 4 (if the open-loop transfer function GH = G_c S) · G_v (S) · G_o (S) · G_m (S) has a zero point, then the system’s root locus