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1、自动控制原理外文作业Ch21.A circuit system is shown in Figure 2.1,Plot the block diagram and find the transfer function 。21()UsFigure 2.12. The unit-step response of a system is6010()1.2.ttyte(1)Find out the transfer function of the system .()/YsR(2)Determine the characteristic equation of the system.(3)Find o
2、ut the closed-loop poles of this second-order system.3A control system is shown in Figure 2.2, plot the signal flow graph and find the transfer function by Mason rule.()CsRFigure 2.21SolutionBased on differential equation The Laplace transfer 2 Solution(1)becauseso 10.2.()61()()YsssRg60YR(2) closed loop characteristic equation2()706Dss(3)closed loop poles: 1,3 SolutionThe signal flow graph isForward path gain 1243 13PGG，Two alone closed-loop gain 1233LGHH，12123HTherefore ()412313pCsGR
