Diagnosis of vortex induced vibration of a gravity damper
1
Università degli Studi Guglielmo Marconi
2
Università degli Studi di Perugia
3
University of Perugia - Department of Engineering
Submission date: 2018-01-08
Acceptance date: 2018-03-09
Online publication date: 2018-03-11
Publication date: 2018-06-11
Corresponding author
Davide Astolfi
University of Perugia - Department of Engineering, Via G. Duranti 93, 06125 Perugia, Italy
University of Perugia - Department of Engineering, Via G. Duranti 93, 06125 Perugia, Italy
Diagnostyka 2018;19(2):31–39
KEYWORDS
TOPICS
ABSTRACT
A gravity damper is a one-way valve, employed for regulating the airflow rate in ducts, generally constituted by a series of rectangular panels (closure sections), connected to an articulated quadrilateral synchronizing the movements. If the device needs to process large masses of high speed air, as common in the case of energy conversion systems, disadvantageous dynamic effects can occur. In this study, vortex-induced vibration (VIV), occurring on a gravity damper for high values of the Reynolds number, is investigated. The analysis of this work couples numerical methods (Computational Fluid Dynamics with Large-Eddy Simulation turbulence model and Finite Element Method) to experiments: a full-scale accelerometric measurement campaign is actually performed at the wind tunnel facilities of the University of Perugia. VIVs are diagnosed and quantified through the experimental vibration analysis, which is interpreted through numerical simulations. The large amplitude of VIV is interpreted as due to a tendency towards lock-in because of the approaching of the vortex shedding frequency to a natural vibration mode of the system. The integrated numerical and experimental framework finally inspires two different design solutions for mitigating the amplitude of VIV: these strategies are tested at the wind tunnel and they are indeed shown to be effective.
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