A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Semi-active control of pedestrian-induced vibrations in footbridges through MR dampers in TMDs
Serviceability problems on recently built footbridges have shown that modern, slender structures of this kind should be designed accounting for vibration limitations. Tuned mass damper have been adopted to control the amount of structural vibration for long: however, their effectiveness could be significantly enhanced by recent improvements in both the device technology and the control electronics. The paper presents a semi-active control system based on magnetorheological tuned mass damper for a cable stayed footbridge. Some numerical analysis on the proposed semi-active control system have been performed based on the experimental data collected during the tests described before. A first result is that the performance of a properly tuned TMD (Tuned Mass Damper) in controlling a given dynamical mode cannot be significantly enhanced by a semi-active device. However, if the TMD is poorly tuned, things are quite different. A figure shows a magnification of the time histories of displacements and of the friction-like component of the damping force for both passive and semi-active configurations. In the case shown, the natural frequency of the TMD is set to roughly 23% lower than the optimal value.
Semi-active control of pedestrian-induced vibrations in footbridges through MR dampers in TMDs
Serviceability problems on recently built footbridges have shown that modern, slender structures of this kind should be designed accounting for vibration limitations. Tuned mass damper have been adopted to control the amount of structural vibration for long: however, their effectiveness could be significantly enhanced by recent improvements in both the device technology and the control electronics. The paper presents a semi-active control system based on magnetorheological tuned mass damper for a cable stayed footbridge. Some numerical analysis on the proposed semi-active control system have been performed based on the experimental data collected during the tests described before. A first result is that the performance of a properly tuned TMD (Tuned Mass Damper) in controlling a given dynamical mode cannot be significantly enhanced by a semi-active device. However, if the TMD is poorly tuned, things are quite different. A figure shows a magnification of the time histories of displacements and of the friction-like component of the damping force for both passive and semi-active configurations. In the case shown, the natural frequency of the TMD is set to roughly 23% lower than the optimal value.
Semi-active control of pedestrian-induced vibrations in footbridges through MR dampers in TMDs
Halbaktive Regelung von durch Fußgänger induzierten Schwingungen von Fußgängerbrücken durch magnetorheologische Dämpfer in abgestimmten Massedämpfern
Occhiuzzi, A. (author) / Spizzuoco, M. (author) / Serino, G. (author)
2004
4 Seiten, 7 Bilder, 2 Quellen
Conference paper
English
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