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Development of an Adaptive Damper for Cable Vibration Control. Final Report.
| 题名： | Development of an Adaptive Damper for Cable Vibration Control. Final Report. |
| 作者： | CAI, C. S.; WU, W. J. |
| 关键词： | *Vibration-damping; *Bridges-.;Dampers-; Damping-; Cables-Ropes; Vibration-isolators; Literature-review; Loads-Forces; Performance-evaluation; Wind-; Rain-. |
| 摘要： | For many cable-stayed bridges in the U.S. and worldwide, large amplitude vibration of cable due to wind-rain induced vibrations has been reported recently. This issue has raised great concerns since excessive cable vibrations will be detrimental to the long-term health of bridges. To address this problem, countermeasures such as changing the cable aerodynamic properties, adding crossing ties/spacers or providing mechanical dampers have been initiated over the years to increase the cable damping. The goal of this study is to develop the concept of an adjustable Tuned Mass Damper-MagnetoRheological (TMD-MR) damper system that can be adjusted to cope with different external loading conditions. The TMD-MR damper system has two combined advantages. First, as a TMD, the TMD-MR damper system can be attached to any place along the cable. Meanwhile, by using MR fluids, the damping and/or stiffness of the TMD-MR damper system is adjustable. As a result, a high damping efficiency will be achieved by overcoming the drawbacks of the frequency and/or mode sensitivity of the traditional TMD dampers and the position restriction of the traditional MR dampers in cable applications. Experiments on MR dampers, cable-MR damper system, cable-TMD damper system, and cable-TMD-MR damper system were carried out in the laboratory. MR damper design and dynamic characteristics analysis of the cable-TMD-MR damper system were performed. |
| 报告类型： | 科技报告 |
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