试题名称:自动控制理论一、设一反馈控制系统如图1所示.其前向传递函数采用如图2的网络,问负反馈控制对系统性能的影响.当在系统中加入一正反馈内回路,如图3所示,问此正反馈内回路对系统性能的影响. 二、设有一单位反馈系统,其前向传递函数有一极点位于正实轴上,G(s)=(6(s+1))/(s(s+1)),问该系统是否为一个二阶系统?说明它有无振荡特性的原因.求其 Title: Automatic Control Theory First, set up a feedback control system shown in Figure 1. Its forward transfer function using the network shown in Figure 2, asked the negative feedback control on the system performance when adding a positive feedback within the system Loop, as shown in Figure 3, asked the positive feedback loop on the system performance.Second, with a unit feedback system, the forward transfer function has a pole in the real axis, G (s) = (6 (s +1)) / (s (s + 1)), to ask whether the system is a second-order system? Explain whether it has the characteristics of oscillation.