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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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Journal ArticleDOI
TL;DR: In this article, the authors examined the dependence of the walker mass and momentum on its velocity and proposed a hydrodynamic boost factor for the walkers, which provides a new rationale for anomalous orbital radii reported in recent studies.
Abstract: It has recently been demonstrated that droplets walking on a vibrating fluid bath exhibit several features previously thought to be peculiar to the microscopic realm. The walker, consisting of a droplet plus its guiding wavefield, is a spatially extended object. We here examine the dependence of the walker mass and momentum on its velocity. Doing so indicates that, when the walker’s time scale of acceleration is long relative to the wave decay time, its dynamics may be described in terms of the mechanics of a particle with a speed-dependent mass and a nonlinear drag force that drives it towards a fixed speed. Drawing an analogy with relativistic mechanics, we define a hydrodynamic boost factor for the walkers. This perspective provides a new rationale for the anomalous orbital radii reported in recent studies.

29 citations

Proceedings ArticleDOI
01 Jan 2004
TL;DR: In this paper, the authors proposed a light-weight solution to the complete force and moment balancing of linkages based on the combination of a counterweight and a separate counter-rotation into a single element.
Abstract: Shaking forces and moments are often undesired. Complete balancing of these effects usually is associated with considerable additional mass and inertia. This paper proposes a light-weight solution concept to the complete force and moment balancing of linkages based on the combination of a counterweight and a separate counter-rotation into a single element. This element will be called a counter-rotary counterweight (CRCW). It will be shown that for a 1dof rotatable link a reduction of added mass by about 40% and a reduction by about 20% of added inertia have been achieved, as compared to a standard solution, after optimization of both mechanisms for minimal inertia. Generalization of the proposed principle is also discussed.Copyright © 2004 by ASME

29 citations

Journal ArticleDOI
TL;DR: In this paper, the authors demonstrate efficient attenuation of flexural vibrations by attaching a simple inertial amplification mechanism to a slender elastic beam, which generates enhanced inertial forces between two attachment points, which effectively counteracts the elastic forces in the beam for certain anti-resonance frequencies.
Abstract: We demonstrate efficient attenuation of flexural vibrations by attaching a simple inertial amplification (IA) mechanism to a slender elastic beam. The mechanism generates enhanced inertial forces between two attachment points, which effectively counteracts the elastic forces in the beam for certain anti-resonance frequencies. These anti-resonances may be generated in the low-frequency range, even for a small added mass. Furthermore, the hybrid structures are shown to exhibit two neighbouring anti-resonance dips providing wide and deep attenuation regions in the frequency domain. The obtained numerical results are validated with the experimental data.

29 citations

Journal ArticleDOI
TL;DR: This work uses finite-time Lyapunov exponents to compute the sensitivity of the final position of a particle with respect to its initial velocity, relative to the fluid, and partition the relative velocity subspace at each point in configuration space to segregate particles by Stokes number in a fluid.
Abstract: It is a commonly observed phenomenon that spherical particles with inertia in an incompressible fluid do not behave as ideal tracers. Due to the inertia of the particle, the planar dynamics are described in a four-dimensional phase space and thus can differ considerably from the ideal tracer dynamics. Using finite-time Lyapunov exponents, we compute the sensitivity of the final position of a particle with respect to its initial velocity, relative to the fluid, and thus partition the relative velocity subspace at each point in configuration space. The computations are done at every point in the relative velocity subspace, thus giving a sensitivity field. The Stokes number, being a measure of the independence of the particle from the underlying fluid flow, acts as a parameter in determining the variation in these partitions. We demonstrate how this partition framework can be used to segregate particles by Stokes number in a fluid. The fluid model used for demonstration is a two-dimensional cellular flow.

29 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202351
2022133
2021111
2020116
2019129
2018124