阻尼比对振幅衰减的影响 d=称为减幅系数 2 AA 1 nT n(1+71) 2丌 n=50o, T1 0 2丌 In d 1+4z2/2d BI eaCd 10判010/10 d d f n T e e Ae Ae A A d A A d r n T n t T n t 2 2 2 2 0 0 1 1 2 ( ) 2 1 2 1 1 4 / ln 1 , 1 2 ln 1 1 2 , 2 1 1 1 1           + = − = − = = = = = = = = − − + − 称为减幅系数