Tuneless Dampers for Suppressing Vibrations of Shick Plates Structures of Steel

由钢板制成的结构，如C形冲床，内耗较小，结构阻尼较小。因此，此类结构中的振动不会迅速衰减，而这些振动会导致噪声问题。在本次研究中，提出了一种适用于这些结构的新型阻尼器。阻尼器由长金属杆和许多粘弹性弹簧组成，这些杆和板连接在一起。储存在粘弹性弹簧中的应变能转变为热。通过实验验证了所提出的阻尼器的减振效果。实验中选用天然橡胶、软质聚氨酯、硅橡胶等作为粘弹性弹簧的材料。使用的是不锈钢圆盘。它的尺寸是10毫米厚，600毫米宽，1000毫米高。测量了带阻尼器的PATE的频率响应和脉冲响应。在所测试的所有情况下，都获得了良好的减振性能。特别是硅橡胶的情况下，表现出高的减振性能。这意味着所提出的无谐阻尼器的最优设计是存在的。为了进行数值模拟，研究了一种利用解析解对板的弯曲振动进行分析的方法。本文对集中激振力及相关问题进行了探讨。集中力表示从弹簧到板的力。应继续进行理论研究。

Structures made of steel plates like as a C-shaped punch press have less internal friction and less structural damping. Therefore vibrations in such structures are not rapidly damped and these vibrations causes noise problems. In this investigation, a new damper for these structures is proposed. The damper consists of long metal bars and many viscoelastic springs that connect the bars to the plates. Strain energy stored in viscoelastic springs changes to heat. This causes damping of the plate vibrations.Experiments are done to confirm the effects of the proposed dampers. In the experiments, natural rubber, soft polyurethane, silicone rubber and so on are used as materials of the viscoelastic springs. A stainless steel pate is used. Its mension is 10mm in thickness, 600mm in width and 1000mm in height. Frequency responses and impulse responses of the pate with the dampers are measured. Excellent damping properties are obtained in all the cases measured. The case of silicone rubber, particularly, shows high damping property. This means existence of the optimum design of the proposed tuneless damper.For numerical simulation, a method of bending vibration analysis of plates using analytic solutions is investigated. In this study, concentrated exciting force and related problems are discussed. The concentrated forces express the forces to plates from springs. Theoretical investigation should be continued.