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Passive suppression of transverse galloping using a non-linear energy sink
Bianca Teixeira, Frédérick Pierre Gosselin, Guilherme Rosa Franzini

Last modified: 2018-04-27

Abstract


Flow-induced vibrations (FIV) usually involve self-excited oscillations that can decrease the structural lifespan of engineering structures. For this reason, mitigation or suppression of FIV is of the utmost importance.

We use of an absorber named non-linear energy sink (NES) aiming at suppressing vibrations caused by the galloping phenomenon. The NES consists on a rigid rod, free to rotate around the axis of a square prism and with a tip-mass. A linear dashpot connects the absorber to the main structure. The equations of motion of the system is non-linear due to the rotative character of the absorber.

The two degrees-of-freedom system composed by the absorber and the main structure is investigated in a reduced-order approach as well as through wind tunnel tests. The aerodynamic loads are modeled by using the standard quasi-static approach. We highlight the influence of the parameters that define the rotative absorber such as its mass, radius and damping constant on the response to the galloping excitation. The modelling approach is validated with measurements of the effect of the NES on the dynamics of the non-linear absorber in wind tunnel tests.

Keywords


Galloping, passive suppression, non-linear dynamics, numerical study, reduced-order model.

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