(O+b)=B1+∑ Vu, cosh(y∠mb(VA) 10(p) 2mpσ 18(P)J0(√A0p)m (N0)2。2兀pσ (N0)22兀G un cosh(vu h) 1 8(p) (M0)2」J(V0p) 2丌o N0)22丌a un cosi (√m1b)N0)2z7       J d I N B a ( ) 2 ( ) ( ) 1 0 0 0 0 (0) 2 0 0  = ( ) 2  1 (0) 2 0 I N =          d I J N u h n a n n n n 2 ( ) ( ) ( ) 1 cosh( ) 0 0 0 (0) 2 0 0  = ( ) 2  1 (0) 2 I Nn =  cosh(  )( ) 2  1 0 0 (0) 2 I h N u n n n n =         2 ( ) ( , ) cosh( ) ( ) 0 0 0 0 1 0 I u h B u h J n n n n z  = + n =  =