Results 211 to 220 of about 8,750 (259)

Comparison of Methods for Computing Equivalent Viscous Damping Ratios of Structures with Added Viscous Damping

Journal of Structural Engineering, 2008
Three analysis methods are compared for determining the equivalent viscous damping ratios in a simple one-story, one-bay system with three different added damping configurations. The analysis methods are modal strain energy using the undamped mode shapes, free vibration log decrement, and complex eigenvalue-eigenvector analysis.
Finley A. Charney, Robert J. McNamara
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The damping of viscous gravity waves

Wave Motion, 2013
Using a solution of the linearized Navier-Stokes equations, an approximate formula has been derived for the damping rate of gravity waves in viscous fluids. The proposed solution extends the results found by Lamb (1932) [5] for waves propagating in deep-water conditions for large Reynolds numbers and those derived by Biesel (1949) under more general ...
Matteo Antuono, Andrea Colagrossi
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Hysteretic and viscous material damping

International Journal for Numerical and Analytical Methods in Geomechanics, 1980
AbstractHysteretic and viscous material damping are compared in the context of soils. Popular assumptions about damping are shown to lead to different results for the rocking mode of surface foundations at low frequency.
Molenkamp, Frans, Smith, Ian M.
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Spring pendulum with dry and viscous damping

Communications in Nonlinear Science and Numerical Simulation, 2015
Abstract Free and forced oscillations of a torsion spring pendulum damped by viscous and dry friction are investigated analytically and with the help of numerical simulations. A simplified mathematical model is assumed (Coulomb law) which nevertheless can explain many peculiarities in behavior of various oscillatory systems with dry friction.
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Reradiation and viscous dislocation damping

Journal of Physics and Chemistry of Solids, 1970
Abstract The vibrating string model has been useful in rationalizing dislocation damping measurements. This model predicts that pinned dislocation line segments of the order of one micron in length will have resonances typically at about 10 9 Hz.
J.A. Garber, A.V. Granato
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Viscous Damping in Flexural Vibrations of Bars

Journal of Applied Mechanics, 1959
Abstract Energy dissipation in flexural vibrations is considered by introducing into the Timoshenko beam equation viscous-damping terms proportional to the time rate of extensional strain. Two modes of wave transmission arise from the roots of a quartic equation.
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A note on the viscous damping of a pendulum

Zeitschrift für angewandte Mathematik und Physik ZAMP, 1963
Eine obere Schranke fur die Dampfung der kleinen Schwingungen eines Pendels wird fur den Fall erhalten, dass die Dampfung durch eine zahe, in einem am Pendel angebrachten Gefass enthaltene Flussigkeit verursacht wird. Diese Schranke gilt fur ein beliebiges Flussigkeitsvolumen, vorausgesetzt, dass dessen Tragheitsmoment bezuglich desjenigen des Pendels ...
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Proportional viscous damping model for matching damping ratios

Engineering Structures, 2020
Abstract A proportional viscous damping model is proposed to address the limitations of existing models that are either inaccurate or computationally costly in matching damping ratios. The proposed model allows easy curve-fitting to a given damping ratio distribution with negligible error and is remarkably accurate for matching a constant damping ...
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The modal equations with viscous damping

Computers & Structures, 1991
Abstract The modal equations are developed for a viscously damped system in free vibration. The solution to these equations, containing all of the system damped mode shapes, is accomplished by a converging iteration scheme. A computer program is included to solve the problem.
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The viscous damping of cnoidal waves

Journal of Fluid Mechanics, 1976
The viscous damping of cnoidal waves progressing over a smooth horizontal bed is investigated. First approximations are derived for the attenuation of wave height with distance and for the friction coefficient at the bed. Attenuation coefficients are larger than those predicted on the basis of shallow-water sinusoidal wave theory and, unlike the case ...
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