余能密度为: 1 clc ado do 0 0(K n+1 NI F-X d JoKA (n+1)K"(2cosa·A 1 cao 0 (n+1)Kx八(4余能密度为： 1 0 1 0 0 1 2 ( 1) 2cos 1 d d d 1 1 1 +        − +  =      =       = = =    n n n N n c c A F X K A n K F K v v a         1 0 3 ( 1) 1 d 3 +       + = =  n c n A X n K v   