∑P-∑= 且: 2k+1)x k=01.2∴….n-m n-m n -m 上式中,∑P为开环极点值之和,∑为开环零点值之和 上例中,n-m=7-4=3,有三条渐近线,它们的和q计算如下 ∑P1=0-6-8-0.5+j-0.5-j-4+j3-4-j3=-23 ∑=,=-1-10-7+j2-7-j2=-25 ∑P-∑= 23-(-25)2 (2k+1)z P k=01.2 n- nn s(2k+1)x k=0.12 3 5丌 q qa1=丌,qa且: 0,1,2, , 1 1 (2 1) = − − − + = − − =   = k n m n m k n m p z a m i i n j j a     上式中, = n j pj 1 = m i i z 为开环极点值之和 1 , 为开环零点值之和. 上例中, n-m=7-4=3, 有三条渐近线,它们的 3 5 , , 3 0,1,2 3 (2 1) 0,1,2, , 1 (2 1) 3 2 3 23 ( 25) 1 10 7 2 7 2 25 0 6 8 0.5 0.5 4 3 4 3 23 0 1 2 4 1 7 1 4 1 7 1            = = = = +  = = − − − + = = − − − = − −  = = − − − + − − = − = − − − + − − − + − − = −     = = = = a a a a a i i j j a i i j j k k k n m n m k n m p z z j j p j j j j     a 和 a 计算如下: