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【简答题】
已知系统如图3-59所示。 试求： (1)为使系统阶跃响应动态性能指标σ％=16．3％，ts=1．65s(△=0．05)，试确定Kg和Kb 的取值。 (2)求满足(1)时系统在给定信号r(t)=1+2t作用下的稳态误差ess。
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