Diagnosis of vortex induced vibration of a gravity damper

• Autorzy: Scappaticci L. , Castellani F. , Astolfi D. , Garinei A.

Identyfikatory

DOI

10.29354/diag/86415

• Języki publikacji: EN

Abstrakty

EN

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, vortexinduced 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 lockin 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.

Słowa kluczowe

EN

mechanical systems; vibration analysis; computational mechanics; accelerometers

PL

układy mechaniczne; analiza drgań; mechanika komputerowa; akcelerometr

• Wydawca: Polskie Towarzystwo Diagnostyki Technicznej
• Czasopismo: Diagnostyka
• Rocznik: 2018
• Tom: Vol. 19, No. 2
• Strony: 31--39
• Opis fizyczny: Bibliogr. 28 poz., rys., tab.

Twórcy

autor

Scappaticci L.

• Guglielmo Marconi University, Department of Sustainability Engineering, via Plinio 44,00193, Roma, Italy

autor

Castellani F.

• University of Perugia, Department of Engineering, Via Duranti, 06125, Perugia, Italy

autor

Astolfi D.

• University of Perugia, Department of Engineering, Via Duranti, 06125, Perugia, Italy

autor

Garinei A.

• Guglielmo Marconi University, Department of Sustainability Engineering, via Plinio 44,00193, Roma, Italy

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).