中文摘要：

基于阻尼减振原理,并引用周期性边界条件,从抑制声桥振动能量传递入手,建立了双层板中间夹开孔阻尼的模型;考虑了阻尼材料的频变特性,通过有限元和边界元的数值算法计算辐射声功率,分析了周期性开孔阻尼夹层板结构的声辐射特性。数值计算结果表明在中低频频段内,双层板结构中间敷设周期开孔阻尼对比全敷阻尼抑制双层板结构声辐射能力在某些频段更优,且能达到减少阻尼材料的使用,优化整体结构的重量;分析了周期性开孔阻尼夹层板结构开孔率和周期数对抑制双层板结构声辐射的影响,找到了抑制夹层板声辐射的最优的开孔率和周期数,并对仿真结果进行了相应的实验验证。

英文摘要：

Base on the principle of damping reduction vibration and reference the periodic boundary conditions,through the acoustic bridge vibration energy transfer, this paper established a double-layer plate with the opening damping model;Considering the frequency-dependent properties of viscoelastic,through the finite element and boundary element numerical algorithm of calculating the radiation sound power,analyzes the periodic perforated damped sandwich plate structure acoustic radiation characteristics. Numerical calculation results show that in low and middle frequency band,periodic perforated damping sandwich plate can not only reduce the double plate radiating acoustic power,but also can reduce the use of damping materials,optimization of the whole structure of weight; Analyses the porosity and periodicity of the periodic opening damped sandwich plate structure influence the double layer plate structure acoustic radiation,found the inhibition of sandwich plate of acoustic radiation of the optimal opening porosity and periodicity,and the conclusion is verified by the experiments.