Experimental study on vibration control of a model footbridge by a tiny eddy-current tuned mass damper with permanent magnets

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (20) : 129-132.

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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

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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.

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vibration control / footbridge / tuned mass damper / eddy current damping / modal damping ratio

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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 [J]. Journal of Vibration and Shock, 2014, 33(20): 129-132