Results 121 to 130 of about 2,493 (156)

Suboptimal Rayleigh damping coefficients in seismic analysis of viscously-damped structures

Earthquake Engineering and Engineering Vibration, 2014
An optimization method for the consistent evaluation of two Rayleigh damping coefficients is proposed. By minimizing an objective function such as an error term of the peak displacement of a structure, the two coefficients can be determined with response spectral analysis. The optimization method degenerates into the conventional method used in current
Danguang Pan, Genda Chen, Zuocai Wang
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Analysis of proportional damping or Rayleigh damping on damped and undamped systems

2017 Fifth International Conference on Aerospace Science & Engineering (ICASE), 2017
Damping mechanisms have been active areas of research for a long time in history, despite this its understanding is still rudimentary as compared to the other traits of modeling. The actual problem is that even now it is not clear, which state variables are relevant for the computation of damping forces, which makes it very difficult to model in Finite
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Viscosity Tensor Approach to the Damping of Rayleigh Waves

Journal of Applied Physics, 1969
An expression for the attenuation of a generalized Rayleigh wave has been obtained in terms of a viscosity tensor. The values of the viscosity components for Quartz obtained from measurements on bulk waves have been used to calculate the attenuation of several surface waves on that material.
P. J. King, F. W. Sheard
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The damping of Rayleigh-Taylor instabilities in a thetatron discharge

Nuclear Fusion, 1961
A high-speed framing camera has been used to photograph deuterium and helium discharges in which flute instabilities are driven by the inertial force of a radial acceleration. The wavelength of the instability increases with decreasing initial pressure, suggesting the damping effect of viscosity; in some cases this damping apparently prevents the ...
H.A.B. Bodin, A.A. Newton, N.J. Peacock
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Effects of Rayleigh Damping on the Subgrade’s Apparent Nonlinearity

Journal of Transportation Engineering, Part B: Pavements, 2020
AbstractThe effect of the subgrade’s apparent (superficial) nonlinearity captured during falling weight deflectometer (FWD) testing has been a major challenge for pavement engineers in trying to ba...
Gabriel Bazi, Jeffrey Gagnon, Peter Sebaaly, Per Ullidtz   +3 more
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On the use of Rayleigh damping for seismic analysis

Proceedings of the Institution of Civil Engineers - Engineering and Computational Mechanics, 2009
Rayleigh damping is widely used for dynamic analysis of structures. Although it is based on a simple formula, the use of Rayleigh damping for seismic analysis involves a hidden complication, which is commonly overlooked both in theory and in practice. The complication arises because mass-proportional damping introduces an extra term into the equations ...
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Maxwell Damping: An Alternative to Rayleigh Damping

Geo-Extreme 2021, 2021
E. M. Dawson, Z. Cheng
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Problems with Rayleigh Damping in Base-Isolated Buildings

Journal of Structural Engineering, 2008
In dynamic analysis, the energy dissipation in a base-isolated building is typically accounted for by allocating damping properties independently to the superstructure and to the isolation system. Rayleigh damping applied to the superstructure component alone is often used to represent the superstructure energy dissipation.
Keri L. Ryan, Jose Polanco
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Rayleigh Damping in Abaqus/Explicit Dynamic Analysis

Applied Mechanics and Materials, 2014
In the nonlinear time-history analysis for high-rise building, different damping models may lead to results with great difference. Limited by the stable time increment, the stiffness proportional damping is usually neglected in Abaqus/Explicit, and only a simplified mass proportional damping is used, which can be derived from the fundamental frequency ...
Xiao Ming Chen, Jin Duan, Hu Qi, Yun Gui Li   +3 more
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Rayleigh Damped Magnetic Resonance Elastograpy

2008
A three-dimensional, incompressible, Rayleigh damped magnetic resonance elastography (MRE) material property reconstruction algorithm capable of reconstructing the spatial distribution of both the real and imaginary parts of the shear modulus, density and bulk modulus from full-field MR-detected harmonic motion data was developed.
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