4gl () (2k+1)m sIn 2k+1)2z2a (t-r dr g4 Cos(2k+1)ria (2k+1)2a 4 g (2k+1)mt COS (2k+1)3ra 得 丌a/2k+[1-、(2k+1)mt 4g12 nIA l(x,) ∑ Isin    t d l k a k a gl T t t k ( ) (2 1) sin (2 1) 4 ( ) 0 2 2 − + + =  t t l k a k a gl 3 3 2 0 2 ( ) (2 1) cos (2 1) 4    − + + = ] (2 1) [1 cos (2 1) 4 3 3 2 2 l k at k a gl   + − + =   = + − + = 0 3 2 3 2 ]sin (2 1) [1 cos (2 1) 4 1 ( , ) k l n x l k at a k gl u x t    得