Investigating the use of Targeted‐Energy‐Transfer devices for stay‐cable vibration mitigation
Investigating the use of Targeted‐Energy‐Transfer devices for stay‐cable vibration mitigation
复制标题
DOI：
10.1002/stc.1772
复制
发表时间：
2016-02
影响因子：
5.4
通讯作者：
Matteo Izzi;L. Caracoglia;S. Noè
中科院分区：
文献类型：
--
作者：
Matteo Izzi;L. Caracoglia;S. Noè
利用复广义特征值问题的解析公式，研究了带有无源目标能量传递（TET）装置的拉紧索的自由振动。这个问题在风、雨-风和参数激励引起的桥梁斜拉索振动抑制中具有相当大的实际意义。TET装置是一种非线性装置，已被研究并成功地应用于多种结构或机械系统的振动抑制。本研究首次提出将TET装置作为一种简单的被动装置用于斜拉索振动缓解。在此应用中，该装置被建模为一个带有粘性阻尼器的阻尼器，该阻尼器与一个幂律非线性弹性弹簧元件并联，并将集中质量约束在一端。通过在阻尼器和甲板之间串联放置弹性支撑（线性弹性弹簧），还模拟了“支撑的灵活性”（不完全锚固在甲板上）。该研究通过考虑非线性弹性刚度、集总质量和支撑灵活性的影响，为TET装置导出了一个新的“通用设计曲线”族。为了验证通用曲线的充分性和评估TET装置的有效性，对参考斜拉索进行了参数化数值模拟。作为应用实例，将分析结果应用于斜拉桥柔性斜拉桥阻尼器的设计。在所有的研究中，得到了理论和数值结果并进行了比较。版权所有©2015 John Wiley & Sons， Ltd
Free vibrations of a taut cable with an attached passive Targeted‐Energy‐Transfer (TET) device are investigated using an analytical formulation of the complex generalized eigenvalue problem. This problem is of considerable practical interest in the context of stay‐cable vibration suppression in bridges, induced by wind, rain–wind and parametric excitation. The TET device is a nonlinear apparatus, which has been investigated and successfully applied to the vibration suppression in several structural or mechanical systems. This study proposes, for the first time, the use of the TET device as a simple passive apparatus for stay‐cable vibration mitigation. In this application, the device was modelled as a dashpot with a viscous damper in parallel with a power‐law nonlinear elastic spring element and a lumped mass restrained to one end. The ‘flexibility of the support’ (imperfect anchorage to the deck) was also simulated by placing an elastic support (linear elastic spring) in series between the dashpot and the deck. The study derives a new family of ‘universal design curves’ for the TET device, by accounting for the effects of nonlinear elastic stiffness, lumped mass and flexibility of the support. To verify the adequacy of the universal curves and to evaluate the effectiveness of the TET devices, parametric numerical simulations were performed on a reference stay cable. As an application example, analytical results were employed to design the dampers of one flexible stay, installed on an existing cable‐stayed bridge. In all the investigations, theoretical and numerical results were obtained and compared. Copyright © 2015 John Wiley & Sons, Ltd.