Results 261 to 270 of about 112,422 (307)

Damping Nonlinearities and Transient Inputs

The Journal of the Acoustical Society of America, 1969
Damping is generally considered to be linear in the mathematical analysis of lumped parameter systems by their associated modal equations of motion. Considering all sources of damping, the damping force should be represented by both linear and nonlinear functions of the modal displacement and velocity and/or a hysteresis curve.
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Uncertainty Quantification for Damping in Transient Pressure Oscillations

Journal of Water Resources Planning and Management, 2019
AbstractThe uncertainty of a model to determine the damping of pressure head oscillations following a sudden valve closure in a simple piping system in a pressurized closed conduit is quantified us...
Sahad Khilqa, Mohamed Elkholy, Mohammed Al-Tofan, Juan M. Caicedo, M. Hanif Chaudhry   +4 more
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Transient Growth of Damped Baroclinic Waves

Journal of the Atmospheric Sciences, 1985
A solution of the linear initial value problem for the model of Eady with the inclusion of Ekman damping is presented. This model exhibits large transient growth of perturbations for synoptic cyclone spatial scales and a realistic value of the vertical turbulent viscosity coefficient despite the fact that all normal modes are exponentially decaying ...
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Damping analysis for transients of modular multilevel converter

2017 IEEE Energy Conversion Congress and Exposition (ECCE), 2017
Presently the choice of circuit parameters in the design of Modular Multilevel Converters (MMC) depends on iterative time-consuming simulation runs. This paper presents a method based on the Floquet-Lyapunov Theorem by which the dynamic characteristics are predicted analytically.
Haihao Jiang, Boon-Teck Ooi
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Transient and Resonant Behavior of Electrically-Damped Microactuators

Micro-Electro-Mechanical Systems (MEMS), 2000
Abstract The transient and resonant behavior of electrostatic microactuators is investigated using the perturbation method and linear control theory. We examine an electrically-damped parallel-plate actuator and comb actuator in this paper.
Yijian Chen, Yashesh Shroff, William G. Oldham   +2 more
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An improved Fourier analysis of damped transients

[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis, 2003
It is shown that, using a systematic approach, it is possible to extract the components of very complex temporal signals (oscillating, nonoscillating or mixed), which may be encountered in various and widely diverging scientific fields. This result may be obtained rapidly and at low cost using standard microcomputers.
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Active damping for electromagnetic transients in superconducting systems

IEEE Transactions on Appiled Superconductivity, 1999
The use of superconductors for power transmission has been studied for decades. The lossless nature of superconducting cables makes the system less stable operationally because damping normally provided by resistive losses is eliminated. Breaker actions during routine system operations or in response to faults can trigger high frequency oscillations ...
B.K. Johnson, H.L. Hess
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Damping transients in polymers during sorption and desorption

Journal of Applied Polymer Science, 1965
It has been found that sudden changes in atmospheric vapor pressure of swelling agents result in a transient increase in mechanical damping in polymers. The effect was observed on both raising and lowering the vapor pressure. The systems investigated were: cellulose (paper)–water; cellulose (paper)–ammonia; gelatin–water; nylon 66–water; cellulose ...
Josef Kubát, Björn Lindbergson
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Modeling of radiation damping and transient transmitting boundary

International Journal of Geotechnical Engineering, 2013
AbstractOne of the primary obstacles in formulating an accurate yet inexpensive procedure for dynamic soil–structure interaction analysis is the modeling of the unbounded medium beneath the structure. Various available techniques could be classified into a rigorous approach and an approximate approach.
M. N. Viladkar, S. K. Garg, A. K. M. S. Al-Assady   +2 more
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Improving transient stability limits by damping accelerating energy

PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409), 2002
An analysis of the post-disturbance phenomena leading to transient instability has been prompted because of the small magnitude of primary accelerating energy produced by generators near the fault. This has shown that the accelerating energy is greatly multiplied as it flows through the network, past successive load substations.
W.R. Lachs, D. Sutanto
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