Results 251 to 260 of about 91,375 (296)

The viscous damping of atmospheric gravity waves

Canadian Journal of Physics, 1963
Dissipation produced by viscous damping and thermal conduction is important in the study of atmospheric gravity waves, which are themselves important in a study of "irregular" motions in the upper atmosphere. The mathematics of this damping is considered in some detail here, and charts are given to assess the effects of viscous damping and thermal ...
Pitteway, M. L. V., Hines, C. O.
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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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Transducers with Improved Viscous Damping

The Journal of the Acoustical Society of America, 2011
A miniature receiver or transducer with improved viscous damping. The receiver may be a moving armature receiver using shearing forces for damping the deflection of the diaphragm. In this receiver, the damping element, which may be a liquid, extend in a direction of the deflection of the armature or diaphragm. Another embodiment relates to a transducer
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Viscous damping on flexural mechanical resonators

Sensors and Actuators A: Physical, 2015
Abstract A new analytical formula predicting the quality factor of a wide range of flexural mechanical resonators operating in a viscous fluid medium is presented. The formula is derived from a fluid analogy used in the single beam Euler–Bernoulli bending theory, and an extension to tuning forks is proposed.
Guillaume Aoust, Raphaël Levy, Béatrice Bourgeteau, Olivier Le Traon   +3 more
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Viscous damping identification in linear vibration

Journal of Sound and Vibration, 2007
Parametric identification of viscous damping models in the context of linear vibration theory is studied. Frequency domain identification methods based on measured frequency response functions (FRFs) are considered. Existing methods are classified into two main groups: matrix methods which use directly the measured FRF matrix, and modal methods which ...
A. Srikantha Phani, J. Woodhouse
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Hybrid Viscous-Structural Damping Identification Method

2014
Damping still remains one of the least well-understood aspects of general vibration analysis. The effects of damping are clear, but the characterization of damping is a puzzle waiting to be solved. A major reason for this is that, in contrast with inertia and stiffness forces, it is not clear which state variables are relevant to determine the damping ...
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Identification of frequency-dependent viscous damping

Proceedings of OCEANS 2005 MTS/IEEE, 2005
This paper analyses the nature of the linear viscous damping terms present in a ship model. An analytical solution for a transfer function model of these terms is presented, and a simplification introduced such that these terms can be identified in the time domain for use in simulation and ...
A. Ross, T.I. Fossen
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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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Modelling Damping in Computer Simulations: Is All Damping Viscous?

Volume 1: 23rd Biennial Conference on Mechanical Vibration and Noise, Parts A and B, 2011
The standard damping model is the viscous dashpot for which the damping force is proportional to velocity. However, this simple model seems not to reflect real conditions where there may be viscoelastic effects, friction or air resistance. No general models for damping are available that can be developed from first principles and used in computer ...
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Viscous damping analysis of WEC’s hull in yaw motion - methodology and viscous damping parameters identification

2021
A comprehensive characterization of a Wave Energy Converter (WEC) requires an overall analysis of the hull, which is identified by inertial terms like mass, added mass and inertia. Being the considered WEC a floating body, from pre-design phases until final stages such as optimization and executive design, equation of motion, both in time and frequency
Fontana M., Casalone P., Dell'Edera O., Niosi F., Battisti B., Mattiazzo G.   +5 more
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