Nonlinear damping of a plate using Faraday instability of a fluid film

Génevaux, Jean-Michel; Lanfranchi, Vincent; Doutres, Olivier

doi:10.1016/j.jsv.2009.04.038

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…The aim of this paper is to investigate experimentally the influence of several parameters on the modal damping coefficient above an acceleration's thresholds to induce relative movement between the beads [6]. The finality would be to create a adjustable equivalent viscous damping coefficient which could depend on the principle parameters of the system.…”

Section: Motivationsmentioning

confidence: 99%

Experimental added modal damping induced by confined granular media on a single degree of freedom system

Sternberger

Pelat²,

Génevaux³

2017

EPJ Web Conf.

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The use of granular media to induce vibration energy's dissipation in lighter huge industrial structures permits to decrease the mass of the structure and consequently to spare the construction's cost and to satisfy oil consumption. In fact, when the structure in which the granular media is in contact overtakes an acceleration threshold, relative movements of the grains appears which lead to a dissipation of energy. When the grains are confined inside a cavity, the dissipation's level depends on several parameters (the acceleration's amplitude, the frequency, the grain's characteristics, the cavity's dimensions, the cavity's filling ratio, the fluid between the particles, etc.). This study quantifies the influence of several parameters by exciting uniformly a given volume of grains. A modal damping coefficient of a single degree of freedom system (SDOF) can be thus calculated as a function of the preceding parameters.

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Section: Motivationsmentioning

confidence: 99%

Experimental added modal damping induced by confined granular media on a single degree of freedom system

Sternberger

Pelat²,

Génevaux³

2017

EPJ Web Conf.

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“…Furthermore, the fluid damping of a disk submerged in still water was studied in [16] and it was found that the fluid damping increases when the disk gets closer to a rigid wall. Other authors studied a disk with a film of water in the upper surface [17], and it was demonstrated that this parameter increases when the vibration amplitude increases and it decreases when the thickness of the water film decreases. According to the author's knowledge the influence of the combined effect of the distance to the rigid wall and vibration amplitude on the fluid damping has not been studied yet.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Fluid Damping in Simplified Models of Pump-Turbines and High Head Francis Runners

Moraga

Valero

Valentín

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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In order to satisfy the power demand in the electrical grid, hydraulic turbine units frequently work under off-design operation conditions and pass through transient events. These operation conditions can lead to high vibration amplitudes in the turbine runners, decreasing their useful life, and in some cases to premature failures. To determine and to understand the behaviour of the fluid damping is a relevant topic, because this parameter limits the maximum amplitude in resonance conditions. The runner of some types of turbines, such as reversible pump-turbine and high head Francis turbine, can be modelled as a disk-like structure, due to their similar mode shapes. Because of this, in this work, the fluid damping of a vibrating disk was studied. The disk was submerged in water and was put in a resonant state at different vibration amplitudes. Moreover, this structure was excited at different distances to a rigid surface, in order to analyse the effects of the distance between the runner and the casing. The main effects on the fluid damping were determined and characterized, showing a dependency of the fluid damping ratio on the different parameters.

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