能量滤 (Energy Method) 2.扭转杆内的变形能( Strain energy for torsional loads) 1 MI M2I T2I E=W=M·Aq=M 2G 2G1 2GI 2 T(x) dx 2G,(x) 或V=∑ =12G: I共1页 9 (Energy Method) 2.扭转杆内的变形能（Strain energy for torsional loads） 或 l p 2 p 2 e p e ε e e 2 2 2 1 Δ 2 1 GI T l GI M l GI M l V = W = M   = M = =  = l x GI x T x V d 2 ( ) ( ) p 2 ε = = n i i i i i G I T l V 1 p 2 ε 2  Me Me   Me