Results 221 to 230 of about 8,750 (259)

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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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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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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Numerical and Experimental Evaluation of the Viscous Damping in a Wellbay

23rd International Conference on Offshore Mechanics and Arctic Engineering, Volume 1, Parts A and B, 2004
Flow viscous damping and energy dissipation around the keels in a wellbay are experimentally and numerically investigated. Experiments have been carried out using a U-shape tube. Damping coefficients are evaluated from water elevation measurements.
Maisondieu, C., Kimmoun, O., de Jouette, C., Gentaz, L.   +3 more
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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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Transition to a turbulent spectrum in the presence of viscous damping

Physical Review E, 1993
The local equation for wave turbulence is used to derive an expression for the minimum energy flux required to both overcome viscous damping and generate a Kolmogorov type of turbulent spectrum. This expression is verified numerically by solving the kinetic equation for the interaction of acoustic ...
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Viscous damping apparatus for damping load cells of weighing devices

The Journal of the Acoustical Society of America, 1994
The present invention is a viscous damping apparatus for damping mechanical shocks discharged on an object. It comprises a container having an inner chamber which has a flat bottom surface, a damping member having a flat lower surface, and means for suspending the damping member such that its flat lower surface is positioned parallel and very close to ...
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The investigation of viscous and structural damping for piezoelectric energy harvesters using only time-domain voltage measurements

Applied Energy, 2021
Lasse Rosendahl, Majid khazaee, John E Huber   +2 more
exaly  

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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