Performance And Vibration Control Test Study On Adjustable Eddy Current TMD

With the continuous development and progress of technology, architectural features become more and more complex and innovative, structural forms more diversified, and the application also more and more widely. These new large-span structures mostly have low stiffness, damping, and fundamental frequency. What's more, the natural frequency is close to the frequency of human normal activities, which can cause the obvious vertical vibration under the action of human induced load and other dynamic loads. It is easy to cause panic. In view of some disadvantages of traditional TMD control, such as narrow band, stiffness and damping difficult to separate. In this paper, I design and research a kind of vertical permanent magnet electromagnet hybrid eddy current TMD, which can realize the TMD damping and stiffness is simple and easy to be adjusted and can be separated.First,this paper has analyzed the theoretical formula of the performance parameters of eddy current TMD, and an eddy current TMD is designed based on the principle. Performance tests are carried out under the condition of multi – group to explore the relationship between the performance of eddy current damper and various factors(frequency, amplitude, gap, current, combination, etc.). And then based on the results of theoretical and experimental research, an eddy current TMD device named HTMD-75 is designed and tested for the natural frequency and damping ratio under different sizes current situation. Finally, HTMD-75 is tested for theoretical and experimental research of vertical steel beams for vibration control effecs. What's more, emi-active control theory will be taked into account compared to the the passive control on the effect of vibration reduction, revealing the general rule of the eddy current TMD control. the experimental data shows that the effect on reducing vibration of the structure by the eddy current TMD is very obvious. The vibration attenuation of structure with the eddy current TMD is 20-30 times faster than structure without the eddy current TMD. And under the same conditions, the vibration effect of semi-active control eddy current TMD is better than passive control eddy current TMD. What's more, the semi-active control eddy current TMD is more energy-efficient and economy.