Abstract
An omnidirectional cantilever-type eddy current tuned mass damper (ECTMD) for lattice towers is introduced to suppress bidirectional vibration of lattice towers, in a form of a cantilever beam with a tip magnet mass. The damping of the ECTMD can be easily changed by tuning the amount of the current. A typhoon-fashion wind environment is simulated for the wind tunnel test. Test results show that there exists an optimal damping of the ECTMD along with an optimal frequency ratio. The scaled aeroelastic model is tested under various wind conditions, and a good effectiveness of ECTMD is observed. The wind directions, perpendicular and parallel to the cross-arm, are the most critical for the design of ECTMD, as the vibration mitigation in either of these two cases is relatively weaker. Finally, a simplified model is established for theoretical analysis in the frequency domain, whereby the variance responses of the tower with and without ECTMD are computed. The numerical results agree well with the experimental results, which corroborates the feasibility of using the proposed omnidirectional cantilever-type ECTMD in suppressing the vibrations of the tower in both along-wind and across-wind directions.
Highlights
Lattice towers are widely used for power transmission, telecommunication, wind turbine, and observation towers, etc
Conclusions that the newly designed Eddy current tuned mass damper (ECTMD) is capable of effectively reducing the bidirectional response under various wind speed and wind directions
A wind tunnel study of a lattice tower with an ECTMD was conducted paper can be applied to tall structures and long-span bridges that undergo significant vibration to gain insight into the performance of the ECTMD used in suppressing vibration of lattice towers
Summary
Lattice towers are widely used for power transmission, telecommunication, wind turbine, and observation towers, etc. Tall lattice towers usually have relatively low natural frequencies and small damping ratios, which may result in large amplitude vibration under dynamic excitation such as wind loads [1,2]. The excessive vibration may diminish the serviceability of the towers, and cause fatigue damage, joint bolt looseness and even structural failure [3,4,5,6,7]. With rapid development of power industry, many high-voltage transmission towers with greater height and span were constructed, especially in China. The world’s highest transmission tower currently is located at Zhoushan in China, with a height of 380 m. These tall transmission towers, which are prone to large vibrations, pose new challenges to engineering design. Improving the performance of wind resistance to ensure the structural safety of the tower has become an important issue, and has attracted great attention
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