摘要
Structure-borne sound attenuation at corner interface of two plates with dynamic vibration absorber attached is investigated by wave approach.Equations governing transmission and reflection coefficients are deduced by introducing some non-dimensional coefficients,which help to reveal the physical sense inside and to simplify the analysis.Numerical investigation on vibration energy transmission of bending wave is carried out as well.The results from measurement and prediction show almost the same trends in the simplified experiment.It is found that energy transmission at corner interface depends greatly on whether the dynamic vibration absorber attached acts at resonance and is relatively lower right after the nature frequency of dynamic vibration absorber.Furthermore,the dynamic vibration absorber attached provides less energy transmission of bending wave than blocking mass at the end of "passing band".
Structure-borne sound attenuation at corner interface of two plates with dynamic vibration absorber attached is investigated by wave approach. Equations governing transmission and reflection coefficients are deduced by introducing some non-dimensional coefficients, which help to reveal the physical sense inside and to simplify the analysis. Numerical investigation on vibration energy transmission of bending wave is carried out as well. The results from measurement and prediction show almost the same trends in the simplified experiment. It is found that energy transmission at corner interface depends greatly on whether the dynamic vibration absorber attached acts at resonance and is relatively lower right after the nature frequency of dynamic vibration absorber. Furthermore, the dynamic vibration absorber attached provides less energy transmission of bending wave than blocking mass at the end of ＂passing band＂.
基金
the Special Foundation of State Key Laboratory of Ocean Engineering of Shanghai Jiaotong University
the Foundation of the Education Department of Shandong Province (No.J10LG60)
