Results 251 to 260 of about 15,143 (300)

IDENTIFICATION OF DAMPING: PART 1, VISCOUS DAMPING

Journal of Sound and Vibration, 2001
Abstract Characterization of damping forces in a vibrating structure has long been an active area of research in structural dynamics. The most common approach is to use “viscous damping” where the instantaneous generalized velocities are the only relevant state variables that affect damping forces.
Adhikari, S, Woodhouse, J
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Electromagnetic and Viscous Damping of Core Oscillations

Geophysical Journal of the Royal Astronomical Society, 2007
Summary A detailed investigation of the interaction of core oscillations with the main magnetic field is made. Selection rules and interaction coefficients are obtained. Although the strengths of the interactions vary over nearly three orders of magnitude, all are extremely weak. Ohmic and viscous dissipation are considered in parallel calculations. It
Crossley, D. J., Smylie, D. E.
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Viscous Damping of Bubbles

The Journal of the Acoustical Society of America, 1960
An expression is derived for the spatial distribution of viscous energy losses in the doby of liquid surrounding a vibrating spherical bubble.
R. K. Gould, W. L. Nyborg
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Viscous damping forces on oscillating cylinders

Applied Ocean Research, 1985
Theoretical descriptions have been derived for the fluid force on a sinusoidally vibrating cylinder. The descriptions were obtained by applying perturbation expansion techniques to the Navier-Stokes equations based on small amplitude-to-radius ratio = e/a and large vibratory Reynolds number R = a2 ¿/¿, where ¿ is frequency of vibration and ¿ is ...
Brouwers, J.J.H., Meyssen, T.E.M.
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MODELING VISCOUS FLUID DAMPING IN OSCILLATING MICROSTRUCTURES

Modern Physics Letters B, 2009
Recent rapid advances in microelectromechanical system have facilitated the applications of various oscillating microstructures, where fluid damping plays a critical role and becomes a main cause of energy dissipation. In the present study, we have used lattice Boltzmann method to investigate the Stokes' second problem for non-equilibrium effect.
Tang, G.H., Zhang, Yonghao, Barber, Robert W., Gu, X.J., Emerson, David   +4 more
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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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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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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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