双层结构薄板箱体减振降噪技术

通过阻尼比的理论计算和实验测试,对黏性流体减振降噪机理进行了研究.针对等效薄板箱体,设计了不同油量单层结构、不同间距无孔隔板双层结构和不同穿孔隔板双层结构下的模态实验,得到了相应的阻尼特性.并通过基于平均阻尼比的阻尼综合特性计算,对比分析了不同工况的整体变化趋势.研究结果表明,箱体流体量的增加、无孔隔板和穿孔隔板的引入在不同程度上提高了系统的阻尼比,降低了系统的声辐射功率;相比无孔隔板双层结构,穿孔隔板的系统阻尼并没有明显提高,但有较好的高频阻尼特性.

Vibration and Noise Reduction for Double-Layer Thin-Wall Box

Utilizing theoretical calculation and measurement of damping ratio,the mechanism in reducing vibration of viscous liquid is investigated.Aiming at the equivalent thin-wall box,the modal experiments,of which include single-layer box with various oil volume,double-layer box with various diaphragm plate distance and with various hole-number,are designed.The corresponding damping ratios are gained.Through the combined characteristic calculation based on the mean damping ratio,the whole change trends of various ...