转角处阻振质量对平面纵波-弯曲波传递衰减作用的研究

摘要

Wave approach was used to investigate the attenuation effect of blocking mass on vibration energy transmission from longitudinal to bending wave at corner interface. Tests of simplified models by using reciprocity principle were carried out as well. The experimental results coincided reasonably well with those of numerical prediction which validated the equations from theoretical analysis. It is found that blocking mass attached at corner interface is effective for reduction of vibration energy transmission from longitudinal to bending wave at high frequencies. The value of transmission loss has little fluctuation with rotatory inertia per unit length of blocking mass at low frequencies. And at high frequencies, the amount of attenuation only depends on mass per unit length of blocking mass, which the transmission loss increases with.%运用波分析法研究附加在转角处的阻振质量对平面纵波-弯曲波振动能量传递的衰减作用,并利用互易原理对简化模型进行了测试.实测值与理论计算结果基本吻合,验证了理论分析的正确性.研究表明,阻振质量对转角处纵波-弯曲波能量的传递在高频区有较好的阻挡作用.传递损失的数值在低频区随阻振质量单位长度的转动惯量略有波动,而在高频区,阻振质量单位长度的质量则是确定对平面纵波-弯曲波传递衰减作用大小的唯一参量,且传递损失随其增加而增大.