Inerter dampers with linear hysteretic damping for cable vibration control
Inerter dampers with linear hysteretic damping for cable vibration control
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DOI：
10.1016/j.engstruct.2021.113069
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发表时间：
2021-11
影响因子：
5.5
通讯作者：
Limin Sun;Junjie Sun;Satish Nagarajaiah;Lin Chen
中科院分区：
文献类型：
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作者：
Limin Sun;Junjie Sun;Satish Nagarajaiah;Lin Chen
斜拉桥中的长斜拉索具有较低的振型频率和较小的振型频率，并受到风雨激振和涡激振动等多种振型的作用。实际中用于拉索振动控制的许多类型的阻尼器都可以用线性滞回阻尼器模型来描述，例如高阻尼橡胶阻尼器和粘性剪切阻尼器。这种阻尼器能够提供与频率无关的减振效果，但由于其固有的刚度效应，最大可达到的减振效果是有限的。因此，本研究采用惯性增强型线性滞回阻尼器来控制拉索的振动。一种通用的惯性阻尼器，由一个具有复刚度的弹簧和一个并联的惯性阻尼器组成，然后串联到另一个惯性阻尼器上，连接到电缆上进行动力学分析。为了评价拉索的阻尼性，进行了复模态分析。从阻尼器的频率动态特性出发，讨论了阻尼器的最佳减振效果，并与带粘滞阻尼器的拉索系统进行了比较。结果表明，两个惯性元件分别与线性滞回阻尼器串联和并联，可显著改善斜拉索的多模阻尼力。为获得最佳性能，与阻尼器串联的惯性元件的惯性应较大，而另一种惯性元件的惯性较小。最后，以苏通大桥安装粘性剪切阻尼器的拉索为例，验证了惯性阻尼器的可行性。
Long stay cables in cable-stayed bridges have low and close-spaced modal frequencies and are subjected to multimode vibrations, e.g., rain–wind vibrations and vortex-induced vibrations. Many types of dampers used in practice for cable vibration control can be described using a linear hysteretic damping model, e.g., high-damping rubber dampers and viscous-shear dampers. Such dampers are able to provide frequency-independent damping effects while the maximal achievable damping is limited due to their intrinsic stiffness effect. Therefore, this study investigates dampers with linear hysteretic damping enhanced by inerters for cable vibration control. A general inerter damper, consisting of a spring with complex stiffness and an inerter in parallel which is then connected to another inerter in series, is attached to a cable for dynamic analyses. Complex modal analysis is performed to appreciate cable damping. The optimal damping effect is discussed with reference to dynamic properties of the damper with respect to frequency, with comparison to the system of a cable with an inerter damper with viscous damping. It is found that two inerters, respectively in parallel and in series with a damper of linear hysteretic damping, can achieve a large improvement on multimode damping of a cable. The inertance of the inerter in series with the damper needs to be large for optimal performance while a small inertance of the other inerter is preferable. Furthermore, a case study based on a cable attached with a viscous-shear damper on the Sutong Bridge is conducted to show the feasibility of the inerter dampers.