Results 161 to 170 of about 2,512 (192)

Maxwell Damping: An Alternative to Rayleigh Damping

Geo-Extreme 2021, 2021
E. M. Dawson, Z. Cheng
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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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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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On the modal damping ratios of shear-type structures equipped with Rayleigh damping systems

Journal of Sound and Vibration, 2006
Abstract The effects of added manufactured viscous dampers upon shear-type structures are analytically investigated here for the class of Rayleigh damping systems. The definitions of mass proportional damping (MPD) and stiffness proportional damping (SPD) systems are briefly recalled and their physical counterpart is derived.
TROMBETTI, TOMASO, SILVESTRI, STEFANO
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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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Damping of Rayleigh waves excited by a moving source

Journal of Soviet Mathematics, 1979
The displacement field in a layered medium excited by a moving source is investigated. The resonance occurring when the speeds of the source and of the Rayleigh wave coincide is investigated and the character of the damping in this case is clarified.
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Multi-frequency inversion in Rayleigh damped Magnetic Resonance Elastography

Biomedical Signal Processing and Control, 2014
Abstract Magnetic Resonance Elastography (MRE) is able to identify mechanical properties of biological tissues in vivo based on underlying assumptions of the model used for inversion. Models, such as the linearly elastic or viscoelastic (VE), can be used with a single input frequency data and can produce a reasonable estimate of identified ...
Andrii Y. Petrov, Paul David Docherty, Mathieu Sellier, J. Geoffrey Chase   +3 more
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Multi-frequency Rayleigh damped elastography: in silico studies

Medical Engineering & Physics, 2014
Rayleigh damping (RD) is commonly used to model energy attenuation for analyses of structures subjected to dynamic loads. In time-harmonic Magnetic Resonance Elastography (MRE), the RD model was shown to be non-identifiable at a single frequency data due to the ill-posed nature of the imaginary components describing energy dissipation arising from ...
Andrii Y, Petrov, Paul D, Docherty, Mathieu, Sellier, J Geoffrey, Chase   +3 more
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An algorithm for solving frequency responses of a system with Rayleigh damping

Archive of Applied Mechanics, 2015
This paper proposes a fast algorithm for solving frequency responses of a system with Rayleigh damping. The algorithm combines modal superposition with a model order reduction. Only the modes corresponding to a frequency range which is a little bigger than that of interest are used for modal superposition. Complementary part of contribution of computed
B. S. Wu, S. T. Yang, Z. G. Li
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Characterization and Synthesis of Rayleigh Damped Elastodynamic Networks

2016
We consider damped elastodynamic networks where the damping matrix is assumed to be a non-negative linear combination of the stiffness and mass matrices (Rayleigh damping). We give here a characterization of the frequency response of such networks.
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