5.3开环系統的伯德图 例3G(s)=10(055+1)/(s+1)(015+1) 开环增益k=20,1积分环节转折频率ω斜率db 低频段斜率=-20 20 2 20 0 20 <1 L(o)=20logK-20logo 1<0<2 L(o)=20logK-20logo-20logo 2<0<10L(o)=20ogK-20ogo-20log0+20log0.50 0>10 L(o)=20logK-20loga-20loga 20log0 5o 20logo 1a5.3 开环系统的伯德图 例3 G(s)=10(0.5s+1)/s(s+1)(0.1s+1) 开环增益 k=20，1积分环节 转折频率 斜率db 低频段 斜率=-20 1 -20 2 20 10 -20 <1 L()=20logK-20log 1<<2 L()= 20logK-20log-20log 2<<10 L()= 20logK-20log-20log+20log0.5 >10 L()= 20logK-20log-20log+20log0.5- 20log0.1