Data for: Damping investigation of cylindrical composite structures with enhanced damping properties

Abstract of the associated article: Constrained layer damping treatments are widely used in mechanical structures to damp acoustic noise and mechanical vibrations. A viscoelastic layer is thereby applied to a structure and covered by a stiff constraining layer. When the structure is vibrating in a bending mode, the viscoelastic layer is forced to deform in shear mode. Thus, the vibration energy is dissipated as low grade frictional heat. This paper documents the efficiency of passive constrained layer damping treatments to damp low frequent vibrations of cylindrical composite specimens made of glass fibre reinforced plastics, representing an arm of a novel high-voltage power pylon structure. Different cross sections geometries such as implemented shear webs were investigated in order to study a beneficial effect on the damping characteristics of the cylinder. The viscoelastic damping layers were placed at different locations within the composite cylinder e.g. circumferential and along the neutral axis to evaluate the location-dependent efficiency of the constrained layer damping treatment. The results of the study lead to a thorough understanding of constrained layer damping treatments and to an improved damping design of the cylindrical composite structure representing the power pylon arm. The study has shown a maximal damping performance when placing the damping layer in the median plane perpendicular to the bending load. The results are based on a free decay test of the composite structure. In the uploaded zip-file, all results, numerical simulation (Abaqus) and Labview files are presented. Furthermore, the Python code for calculating the damping based on the modal strain energy method is also added to the folder.关联文章摘要：约束层阻尼处理（Constrained Layer Damping）被广泛应用于机械结构，用于抑制声学噪声与机械振动。其实现方式为在结构表面涂覆粘弹性层（viscoelastic layer），再于其上覆盖刚性约束层。当结构以弯曲模态振动时，粘弹性层会被迫产生剪切变形，进而将振动能量以低品位摩擦热的形式耗散。 本研究针对作为新型高压输电塔结构塔臂的玻璃纤维增强塑料（Glass Fibre Reinforced Plastics, GFRP）圆柱复合材料试件，探究了被动约束层阻尼处理对其低频振动的抑制效果。研究考察了包括内置剪力腹板在内的多种截面几何构型，以分析其对圆柱结构阻尼特性的增益效应。研究中将粘弹性阻尼层布置在复合材料圆柱的不同位置，例如沿周向或沿中性轴方向，以此评估约束层阻尼处理的位置相关阻尼效率。 本研究结果使学界对约束层阻尼处理形成了全面深入的认知，并为该输电塔臂用圆柱复合材料结构的阻尼优化设计提供了支撑。研究表明，将阻尼层布置于垂直于弯曲载荷的中平面时，可获得最优阻尼性能，所有结果均基于复合材料结构的自由衰减试验获取。 在上传的压缩包中，包含全部试验结果、数值仿真（Abaqus）文件与Labview程序文件。此外，文件夹中还附带了基于模态应变能法计算阻尼的Python代码。