中文摘要：

研究了损伤Timoshenko梁的振动功率流特性。用一局部转动弹簧来模拟梁中的损伤，利用断裂力学的有关理论得到局部弹簧的转动刚度。为了分析问题简便，讨论了一无限长Timoshenko梁在集中载荷作用下的弯曲波运动以及振动功率流的输入与传播，分析了振动功率流与损伤位置及其深度的关系，为Timoshenko梁的损伤识别提供了理论基础。

英文摘要：

The characters of vibrational power flow of a damaged Timoshenko beam is investigated. The damage is modelled as a local rotational spring, the stiffness of the damage is deduced using fracture mechanics. The flexural wave motion and the input power flow together with transmitted power flow are researched under the point force. The relations between the vibrational power flow and the characters damage （depth and location） are discussed, which is the basis of the Timoshenko beam＇s damage of the detection.