Results 241 to 250 of about 91,375 (296)

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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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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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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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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Equivalent Viscous Damping of Bilinear Hysteretic Oscillators

Journal of Structural Engineering, 2015
AbstractAn improved formula to determine the equivalent viscous damping ratio of a single-degree-of-freedom (SDOF) bilinear oscillator is proposed in this paper, which simultaneously considers the influence of the initial period, ductility ratio, and strain hardening ratio.
Liu T., Zordan T., Zhang Q., Briseghella B.   +3 more
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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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Optimal viscous damping of vibrating porous cylinders

Journal of Fluid Mechanics, 2019
We theoretically study small-amplitude oscillations of permeable cylinders immersed in an unbounded fluid. Specifically, we examine the effects of oscillation frequency, permeability and shape on the effective mass and damping coefficients, the latter of which is proportional to the power required to sustain the vibrations.
Saeed Jafari Kang, Esmaeil Dehdashti, Vahid Vandadi, Hassan Masoud   +3 more
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Linear Electrostatic Oscillator With Viscous Damping

Volume 10: 19th International Conference on Multibody Systems, Nonlinear Dynamics, and Control (MSNDC), 2023
Abstract Experimental analysis of a translating spring-mass system with a constant electrostatic force in the presence of viscous damping is presented. The challenge in this effort has been to develop an analytical model for the electrostatic system and experimentally extract numerical values for viscous damping and the very small ...
Kip D. Coonley, Hammond Humber, Brian P. Mann   +2 more
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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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