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Principle of Tuned Mass Damper(TMD) Technology, In essence, TMD effectively absorbs the vibration of the structure.
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Principle of Tuned Mass Damper(TMD), with Pendulum type TMD
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TESolution's Double Pendulum(left) TMD make use of a shorter arm length to achieve a long natural period which can be ideal for applications in high-rise buildings with limited vertical installation space.
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3D Model of TESolution Bidirectional Double Pendulum Tuned Mass Damper(TMD) in action.
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160Ton Tuned Mass Damper(TMD) installed on Posco E&C Head Quarter building in action during the storm event in Aug. 30th 2011.
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Hybrid Mass Damper(HMD) for testing before installation taking place at Techno Mart, Seoul.
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Hanger ropes of suspension bridges and stay-cables of cable-stayed bridges, even though very effective in carrying tensional loads of the bridge, are susceptible to various kinds of wind induced vibration due to their low damping ratio:
- aeolian vibration (vortex-induced vibration) - galloping - wake galloping - rain-induced vibration - parametric excitation - buffeting Stockbridge damper, currently most commonly used vibration damper for power line, can be designed to dissipate the input wind energy over a wide range of frequencies. |
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Stockbridge damper is not only much more cost efficient way of controlling cable vibration compared to traditional viscous dampers, but also is easier to install and its installation location can be easily adjusted to attain the maximum damping.
TESolution has technology and know-how in Stockbridge damper not only for suspension bridge, but also for cable-stayed bridge as well where it requires more careful control of low frequency modes. |
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