【摘要】 基于结构噪声的观点研究了在集中力作用下多点损伤梁的波传播与振动功率流特性.采用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,分析得到了两点损伤梁的弯曲波运动及振动功率流的输入和传播.讨论了振动功率流与损伤位置及其深度的关系,结果表明多点损伤梁中的振动功率流与各损伤点的位置以及其特征尺寸是相关联的.更多还原

【Abstract】 In the view of structure-borne sound,the wave propagation and power flow characteristics were investigated for multiple damaged beams loaded by point force.The damages are modelled as local rotational springs,and the stiffnesses of the damages are deduced by fracture mechanics.The flexural wave motion and the input power flow together with transmitted power flow for double damaged beams are researched under the excitation of point force.The relations between the vibrational power flow and the characteristics of damage(depth and location) are discussed.The results show that the power flow is highly related to the location and the size of each damage.更多还原