Tuneless Dampers for Suppressing Vibrations of Shick Plates Structures of Steel

由钢板制成的结构，如C形冲床，具有较小的内摩擦和较小的结构阻尼。因此，这种结构中的振动不能迅速衰减，并且这些振动引起噪声问题。在这项调查中，提出了一种新的阻尼器，这些结构。阻尼器由长金属杆和许多连接杆和板的粘弹性弹簧组成。储存在粘弹性弹簧中的应变能转化为热量。实验验证了所提出的阻尼器的有效性。在实验中，采用天然橡胶、软质聚氨酯、硅橡胶等材料作为粘弹性弹簧的材料。使用不锈钢板。它的尺寸为10mm厚，600mm宽，1000mm高。测量了带阻尼器平板的频率响应和脉冲响应。在所有测量的情况下都获得了优异的阻尼性能。尤其是硅橡胶的情况，显示出高阻尼特性。在数值模拟方面，本文研究了一种利用解析解分析板弯曲振动的方法。本文对集中激振力及其相关问题进行了探讨。集中力表示弹簧对板的作用力。理论研究还需继续。

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.