Experimental study on vibration control of a model footbridge by a tiny eddy-current tuned mass damper with permanent magnets
WANG Zhi-hao1, 2，CHEN Zheng-qing2，WANG Xu1，WANG Zhao-yang1
1. School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450011, China； 2. Wind Engineering Research Center, Hunan University, Changsha 410082, China
摘要针对现有结构模型减振实验用调谐质量阻尼器（Tuned Mass Damper，TMD）难以实现TMD刚度与阻尼参数完全分离、阻尼参数试验过程中无法保持恒定且难以调整问题，研制微型永磁式电涡流阻尼TMD。其性能试验与分析结果表明，微型TMD采用电涡流阻尼装置既能确保刚度与阻尼参数的有效分离，亦能实现阻尼参数稳定、简单易调。通过某大跨度人行桥模型一阶横向振动模态自由振动减振实验识别获得结构模态阻尼比及强迫振动减振实验识别获得结构模态阻尼比、结构动力响应放大倍数、结构与TMD运动相位差等，证实微型永磁式电涡流阻尼TMD用于结构模型减振实验的可行性与有效性。
Abstract：Traditional tuned mass damper (TMD) adopted for vibration control model test of civil engineering structures has several obvious disadvantages. It can’t well separate the damping and stiffness components, and the damping coefficients can’t keep the same during the movement of the TMD. In addition, it is difficult to adjust the damping coefficient during the control performance tuning in the test. By performance tests and analysis, it is proved that the developed tiny TMD with eddy-current damping can successfully solve the above three problems. The great advantage of the proposed TMD is that its damping ratios can be easily adjusted by changing the thickness of conductor plates. Finally, model test on lateral vibration control a footbridge has further demonstrated the feasibilities and effectiveness of the developed TMD based on identified modal damping ratios of structure subjected to both free vibration and forced vibration excitation, structural dynamic response magnification as well as the phase between the main structure and TMD in the forced vibration excitation tests.
汪志昊;陈政清;王 旭;王朝阳. 基于微型永电磁式涡流阻尼TMD的人行桥模型减振试验研究[J]. , 2014, 33(20): 129-132.
WANG Zhi-hao;;CHEN Zheng-qing;WANG Xu;WANG Zhao-yang. Experimental study on vibration control of a model footbridge by a tiny eddy-current tuned mass damper with permanent magnets . , 2014, 33(20): 129-132.
2014, Vol. 33 
