约束阻尼结构板振动性能实验研究

通过对约束阻尼结构试样进行单点锤击实验,研究了约束层厚度和阻尼层厚度对约束阻尼结构振动性能的影响。分析了各组结构的振动幅值、振动加速度、振动加速度总级值和结构复合损耗因子。研究发现,当结构约束层厚度从40 mm增加至60 mm时,试样减振性能改善最明显。当结构约束层为80 mm厚时,3 mm厚阻尼层结构减振效果最好且阻尼层阻尼效率最高。当结构约束层为20 mm、40 mm和60 mm时,2 mm厚阻尼层结构减振效果最好且阻尼层阻尼效率最高。综合考虑结构性能、减振效率和经济因素,60 mm厚约束层、2 mm厚阻尼层为所研究试样中的最优组合。

Experimental study on vibration performance of constrained damped structural plates

The thickness influence of constrain layer and damping layer on vibration performance of the structure is studied by single point hammer test. Vibration amplitude, vibration acceleration, total vibration acceleration level value and compound loss factor are analyzed respectively. The result shows that the damping performance is improved obviously when the thickness of the structural constraint layer increases from 40mm to 60mm. When the thickness of the damping layer is 3mm, the 80mm-constrain layer structure has the best damping performance, and the damping efficiency of damping layer is the highest. The damping performance of the structure with 2mm-damping layer is the best and the damping efficiency of damping layer is the highest, when the thickness of the constraint layer is 20mm, 40mm and 60mm respectively. Considering the structure performance, vibration reduction efficiency and economic factors, the structures which the thickness of constraint layer and damping layer are 60mm and 2mm respectively, which is the superior combination within the range of research.