Optimal variables of TMDs for multi-mode buffeting control of long-span bridges
Optimal variables of TMDs for multi-mode buffeting control of long-span bridges
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DOI：
10.12989/was.2003.6.5.387
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发表时间：
2003-10
影响因子：
1.6
通讯作者：
Suren Chen;C. Cai;M. Gu;Chih-Chen Chang
中科院分区：
文献类型：
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作者：
Suren Chen;C. Cai;M. Gu;Chih-Chen Chang
摘要。在过去的几十年里，人们对基于单模态的振动控制进行了大量的研究，这些振动控制采用了动态能量吸收器，如单个或多个调谐质量阻尼器（TMDs）。随着桥梁跨径的增大和桥梁截面向更细、更流线型的方向发展，多模态耦合振动及其控制对于易受大风影响的大型桥梁来说变得非常重要。作为一种简单有效的装置，TMD系统特别是半主动系统已成为这种耦合振动控制的一种很有前途的选择。然而，尽管对基于TMDs的单模态振动的最优控制进行了各种研究，但对多模态耦合振动的相应控制研究目前还很少。为了开发抑制多模态耦合振动的半主动控制策略，需要对该控制策略的最优变量进行全面的参数分析。本文首先讨论了“三排”TMD系统的多模态控制策略，并建立了一般的数值方程。以虎门悬索桥为研究对象，对“三排”TMD系统的最优控制变量进行了参数化研究，获得了抑制耦合振动的一些有用信息和最优控制变量。这些信息为半主动控制的设计奠定了基础。关键词：抖振；调谐质量阻尼器；模式耦合;大跨度桥梁;控制。
Abstract.In the past decades, much effort has been made towards the study of single-mode-basedvibration controls with dynamic energy absorbers such as single or multiple Tuned Mass Dampers(TMDs). With the increase of bridge span length and the tendency of the bridge cross-section being moreslender and streamlined, multi-mode coupled vibrations as well as their controls have become veryimportant for large bridges susceptible to strong winds. As a simple but effective device, the TMD systemespecially the semi-active one has become a promising option for such coupled vibration controls.However, despite various studies of optimal controls of single-mode-based vibrations with TMDs, researchon the corresponding controls of the multi-mode coupled vibrations is very rare so far. For the development ofa semi-active control strategy to suppress the multi-mode coupled vibrations, a comprehensive parametricanalysis on the optimal variables of this control is substantial. In the present study, a multi-mode controlstrategy named “three-row” TMD system is discussed and the general numerical equations are developedat first. Then a parametric study on the optimal control variables for the “three-row” TMD system isconducted for a prototype Humen Suspension Bridge, through which some useful information and a betterunderstanding of the optimal control variables to suppress the coupled vibrations are obtained. Thisinformation lays a foundation for the design of semi-active control.Keywords:buffeting; tuned mass damper; mode coupling; long-span bridge; control.