Abstract
In this paper, an eddy current tuned mass damper (ECTMD) is utilized to control the vibration of a cantilever beam. The robustness of the ECTMD against frequency detuning is experimentally studied in cases of both free vibration and forced vibration. The natural frequency of the cantilever beam can be adjusted by changing the location of a lumped mass. For purposes of comparison with the ECTMD, the robustness of a tuned mass damper (TMD) is also studied. The experimental results in the free vibration case indicate that the ECTMD works well both in tuned and detuned situations, and the equivalent damping ratio of the cantilever beam equipped with the ECTMD is 2.08~5.91 times that of the TMD. However, the TMD only suppresses the free vibration effectively in the tuned situation. With forced vibration, the experimental results also demonstrate the robustness of the ECTMD in vibration suppression in detuned cases. On the other hand, the cantilever beam with TMD experiences 1.63~2.99 times the peak vibration of that of the ECTMD control.
Highlights
Vibration control is commonly used in civil engineering [1,2,3,4,5], and includes passive [6,7], semi-active [8,9,10] and active approaches [11,12,13]
The eddy current tuned mass damper (ECTMD) consists of a small cantilever beam, a permanent magnet and a copper plate fixed on the primary cantilever beam
The experimental results in the free vibration case clearly reveal that a beat vibration is excited in the structure with the tuned mass damper (TMD), and the TMD reduces the vibration of the controlled structure in the structure with the TMD, and the TMD reduces the vibration of the controlled structure by by transferring the energy to the TMD, and the vibration reduction is effective only in transferring the energy to the TMD, and the vibration reduction is effective only in the the tuned situation
Summary
Vibration control is commonly used in civil engineering [1,2,3,4,5], and includes passive [6,7], semi-active [8,9,10] and active approaches [11,12,13]. When the frequency of the TMD is tuned to the same as that of the controlled structure, the vibration energy of the controlled structure is transferred to the TMD through the spring-mass system and is dissipated by the damper. Eddy current dampers (ECDs) have been proposed to suppress structural vibration, and the control effectiveness of ECDs has been demonstrated both experimentally and numerically [36,37]. Bae et al [41] applied an ECD to provide additional damping for a tuned mass damper system on the vibration control of a large-scale beam structure, and the feasibility of applying the ECD in the vibration control of large structures was verified. Eddy current tuned mass dampers (ECTMDs), which combine a traditional TMD and an ECD, have been proposed to control undesirable vibrations. The robustness of a traditional TMD was studied to make a comparison with the ECTMD
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