tp = 3(s) ts = 5(s)Р连续二阶系统: p% =16.3%,tr = 2.42(s),tp = 3.6(s),? ts = 5.3(s)РР7Р.РР解:求开环脉冲传递函数Р例8-26 在例8-45中,增加零阶保持器,采样系统如图示,T=1(s),r(t)=1(t),试分析系统的性能指标。Рr(t)Рc(t)Р+Р-Р1?s(s+1)РZOHРР8Р.РР再求闭环脉冲传递函数РC(z) = 0.368z 1 + z 2 + 1.4z 3 +1.4z 4 + 1.147z 5 +? 0.895z 6 + 0.802z 7 + 0.868z 8 + …Рc*(t) = 0.368( t T) + ( t 2T) + 1.4( t 3T) + 1.4( t4T)? + 1.147( t 5T) + 0.895( t 6T) + 0.802( t 7T)? + 0.868( t 8T) + 0.993( t 9T) + …РР9Р.РР0 T 2T 3T 4T 5T 6T 7TРc*(t)Р1РtРc*(t) = 0.368( t T) + ( t 2T) + 1.4( t 3T) + 1.4( t4T)? + 1.147( t 5T) + 0.895( t 6T) + 0.802( t 7T)? + 0.868( t 8T) + 0.993( t 9T) + …Рp% =40% tr = 2(s) tp = 4(s) ts = 12(s)РР10Р.