针对国际海事组织MSC《船上噪声等级规则》修订案对我国造船业带来的挑战及船舶结构振动工程预报难点,研究船舶结构声传递规律,提出"源-路径-接受点"的系统分析法。按"振动源强度估算-传递路径计算-接受点能量分析"...针对国际海事组织MSC《船上噪声等级规则》修订案对我国造船业带来的挑战及船舶结构振动工程预报难点,研究船舶结构声传递规律,提出"源-路径-接受点"的系统分析法。按"振动源强度估算-传递路径计算-接受点能量分析"过程对船室空气噪声级进行计算,利用现场数据观测和数值模拟相结合的方法进行船舶结构振动的快速工程预报,开发"源-路径-接受点"法分析软件。对某船舱段进行噪声预报和半实物模拟分析,结果表明:"源-路径-接受点"法减少了船舶振动预报时间及设计风险,船舶舱室噪声预报误差<3 d B。展开更多
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...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".展开更多
文摘针对国际海事组织MSC《船上噪声等级规则》修订案对我国造船业带来的挑战及船舶结构振动工程预报难点,研究船舶结构声传递规律,提出"源-路径-接受点"的系统分析法。按"振动源强度估算-传递路径计算-接受点能量分析"过程对船室空气噪声级进行计算,利用现场数据观测和数值模拟相结合的方法进行船舶结构振动的快速工程预报,开发"源-路径-接受点"法分析软件。对某船舱段进行噪声预报和半实物模拟分析,结果表明:"源-路径-接受点"法减少了船舶振动预报时间及设计风险,船舶舱室噪声预报误差<3 d B。
基金the Special Foundation of State Key Laboratory of Ocean Engineering of Shanghai Jiaotong Universitythe Foundation of the Education Department of Shandong Province (No.J10LG60)
文摘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".
