垫高层开槽宽度对带槽垫高阻尼结构减振性能的影响

通过单点锤击试验研究了带槽垫高阻尼结构的传递函数曲线和倍频程谱等特性。探讨了垫高层开槽宽度对结构的单位力振动响应、复合损耗因子以及振动总极值等阻尼性能的影响规律。结果表明:当垫高层开槽宽度从10 mm增至30 mm,垫高结构的单位力振动响应和振动总极值先升高后降低,复合损耗因子先降低后升高。另外,开槽宽度30 mm时,结构单位力振动响应为3. 60 m/(s~2·N),总极值仅为124. 81 d B,损耗因子为0. 139 8。因此,在10～30 mm范围内,垫高层开槽宽度30 mm最为理想。

Influences of Slot Width of Stand-off Layer on Vibration Property of Slotted Stand-off Layer Damping Structure

The transmission function curves and one-third octave bands spectrum of slotted stand-off damping structure is studied by single point hammer test. And the effect law of the slot width of stand-off layers on the damping performance, such as vibration response under unit force, compound loss factor and vibration level value, was discussed. The results show that the vibration response under unit force and vibration level value was improved first and then declined, compound loss factor was declined first and then improved, when the slot width of stand-off layer increase from 10 mm to 30 mm. When the slot width of stand-off layer is 30 mm, the vibration response under unit force is 3.60 m/s2/N, the level value is 124.81 dB, and the second order loss factor is 0.1398. It is concluded that the superior slot width is 30mm within the range of 10 mm to 30 mm.