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2015/11/14 环节的频率响应一振荡环节(续) L(o)=-20lgV1-T2o2)2+(25To)2 (@)=-arctan 25T0 1-72) E为常数 (0<宁 L(o)≈0 低频渐近线 0<0<宁 p(o)=0° 0dB水平线 1 (0= =0)p)=-g'25))=-90 0 转折频率 (@>) L(@)=-201g(OT)=-401goT 高频渐近线 (片<<0) p(o)=-180° -40dB/dec斜线 School of Mechanical Engineering ME369-lecture 7.2 Shanghal Jiao Tong University Fall 2015 环节的频率响应一振荡环节(续) 00 0.1 =0.3 =0.2 =0.5 0 -10 渐近线 40dB/dec 00 =0.7 2=1.0 0 40 135 -180 0.1 1 10 @/0n School of Mechanical Engineering ME369-lecture 7.2 Shanghai Jiao Tong University Fall 2015 82015/11/14 8 BE315-Lecture 7.2 Fall 2011 ME369-lecture 7.2 Fall 2015 School of Mechanical Engineering Shanghai Jiao Tong University 为常数 2 2 2 2 L T T ( ) 20lg (1 ) (2 )         1 ( ) T   L( ) 0   2 L T T ( ) 20lg( ) 40lg        1 ( ) T   1 ( ) n T     ) T 1 (0   ) T 1 (    低频渐近线 0dB 水平线 -40dB/dec 斜线 转折频率 高频渐近线 2 2 2 ( ) arctan( ) 1 T T          ()  0 1 2 ( ) ( ) 90 0          tg  ()  180 环节的频率响应—振荡环节(续) BE315-Lecture 7.2 Fall 2011 ME369-lecture 7.2 Fall 2015 School of Mechanical Engineering Shanghai Jiao Tong University 环节的频率响应—振荡环节(续)
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