通解:V= a sin kx+ Bcos ha 边界条件:x=0时:=0→B=0 x=l时:=0→ Sinal=0 sink=0→k=nn(n=0,1,2,…) P k= EIP El→ 2 Elsin kl = 0 通解: v = Asinkx + Bcoskx 边界条件:x = 0时:v = 0 B = 0 x = l 时:v = 0 Asinkl = 0 kl = n (n = 0,1,2, ) k n l = P = n EI l 2 2 2 k P E I 2 = = P EI