Topic
Added mass
About: Added mass is a research topic. Over the lifetime, 2849 publications have been published within this topic receiving 47899 citations.
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26 Nov 2012TL;DR: In this paper, an experimental investigation of damping due to fluid-structure interaction (FSI) governs the dynamic response of water turbines, such as Francis turbines, is presented, where the experimental setup, designed to create dynamic characteristics similar to the ones of Francis turbine blades, together with the experimental protocol and examples of measurements obtained.
Abstract: Fluid-structure interaction (FSI), in the form of mass loading and damping, governs the dynamic response of water turbines, such as Francis turbines. Water added mass and damping are both critical quantities in evaluating the dynamic response of the turbine component. Although the effect of fluid added mass is well documented, fluid damping, a critical quantity to limit vibration amplitudes during service, and therefore to help avoiding possible failure of the turbines, has received much less attention in the literature. This paper presents an experimental investigation of damping due to FSI. The experimental setup, designed to create dynamic characteristics similar to the ones of Francis turbine blades is discussed, together with the experimental protocol and examples of measurements obtained. The paper concludes with the calculated damping values and a discussion on the impact of the observed damping behaviour on the response of hydraulic turbine blades to FSI.
22 citations
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TL;DR: In this paper, a mathematical model to examine nonlinear vibrations of nanoplates based on the nonlocal theory postulating nonlinear Winkler foundation is presented. But the model is not suitable for high-resolution mass detection.
22 citations
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17 Sep 2010
TL;DR: In this article, a wave energy converter comprises a pitching floating vessel and means for converting the pitching motion to electrical power, by varying the distribution of the ballast mass in the vessel and by varying its immersed length the moments of inertia of mass and of added mass are varied and wavebridging is controlled.
Abstract: A wave energy converter comprises a pitching floating vessel and means for converting the pitching motion to electrical power. By varying the distribution of the ballast mass in the vessel and by varying the vessel's immersed length the moments of inertia of mass and of added mass are varied and wave-bridging is controlled. The immersed length of the vessel is varied by changing the draft of a v-shaped hull. Roll and yaw are suppressed by a vertical fin held at a substantial depth Inside the vessel is a compact pendulum that is a combination of tracked and folding pendulums. Both vessel and compact pendulum can be simultaneously and dynamically tuned over the range of periods that characterize high-energy ocean swells.
22 citations
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TL;DR: In this article, an eigenfunction expansion series was derived to circumvent convergence difficulties associated with the jump in the shear force due to the moving interaction force, an improved series expansion employing the static Green's function was derived.
Abstract: In this paper the problem of an oscillator traversing an elastically supported continuum is studied. The flexibility in the boundaries of the continuum is modeled by linear transverse springs. The response of the continuum and the dynamic interaction force between the moving oscillator and the continuum are evaluated by an eigenfunction expansion series. To circumvent convergence difficulties associated with the jump in the shear force due to the moving interaction force, an improved series expansion employing the static Green's function is derived. The coupled governing equations of motion are solved numerically and results are obtained to examine the effects of the boundary flexibility on the response, the dynamic interaction force, the shear force spatial and temporal distributions, as well as the convergence properties of the expansion series. It is found that high order modal terms contribute significantly to the shear force expansion series in the elastically supported model. The presence of large amplitude and high frequency components in the shear force is critical in understanding the cumulative fatigue failure of the structure. A useful and compact formula estimating the value of the support stiffness above which a boundary may be modeled as simply supported is also derived
21 citations
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TL;DR: In this paper, the authors used the Arbitrary Lagrangian Eulerian (ALE) fluid-structure interaction (FSI) method to simulate ship-ship/ship-ice collisions, in which hydrodynamics are incorporated to estimate a more realistic and reliable collision response.
21 citations