A set of indicators for arc faults detection based on low frequency harmonic analysis

2016 ◽  
Author(s):  
G. Artale ◽  
A. Cataliotti ◽  
V. Cosentino S. Nuccio ◽  
D. Di Cara ◽  
G. Tine ◽  
...  
Keyword(s):  
Harmonic Analysis ◽  
Low Frequency ◽  
Frequency Harmonic

scholarly journals A Modified Nonstationary Tidal Harmonic Analysis Model for the Yangtze Estuarine Tides

2019 ◽  
Vol 36 (4) ◽  
pp. 513-525 ◽  
Author(s):  
Min Gan ◽  
Yongping Chen ◽  
Shunqi Pan ◽  
Jiangxia Li ◽  
Zijun Zhou
Keyword(s):  
Harmonic Analysis ◽  
Low Frequency ◽  
Yangtze Estuary ◽  
Atmospheric Tides ◽  
Source Analysis ◽  
Analysis Model ◽  
Tidal Fluctuation ◽  
The Yangtze Estuary ◽  
Tidal Harmonic ◽  
Oceanic Tides

AbstractInfluenced by river discharge, the tidal properties of estuarine tides can be more complex than those of oceanic tides, which makes the tidal prediction less accurate when using a classical tidal harmonic analysis approach, such as the T_TIDE model. Although the nonstationary tidal harmonic analysis model NS_TIDE can improve the accuracy for the analysis of tides in a river-dominated estuary, it becomes less satisfactory when applying the NS_TIDE model to a mesotidal estuary like the Yangtze estuary. Through the error source analysis, it is found that the main errors originate from the low frequency of tidal fluctuation. The NS_TIDE model is then modified by replacing the stage model with the frequency-expanded tidal–fluvial model so that more subtidal constituents, especially the “atmospheric tides,” can be taken into account. The results show that the residuals from tidal harmonic analysis are significantly reduced by using the modified NS_TIDE model, with the yearly root-mean-square-error values being only 0.04–0.06 m for the Yangtze estuarine tides.

Filter for testing low-frequency harmonic analyzers S5-2 and S5-3

1974 ◽  
Vol 17 (4) ◽  
pp. 616-617
Author(s):  
A. S. Karavaev ◽  
L. V. Mishin
Keyword(s):  
Low Frequency ◽  
Frequency Harmonic

Vibration of otolithlike scatterers due to low frequency harmonic wave excitation in water.

2011 ◽  
Vol 129 (4) ◽  
pp. 2472-2472 ◽  
Author(s):  
Carl R. Schilt ◽  
Ted W. Cranford ◽  
Petr Krysl ◽  
Anthony D. Hawkins
Keyword(s):  
Harmonic Wave ◽  
Low Frequency ◽  
Wave Excitation ◽  
Frequency Harmonic

Localized Vibration Isolation Strategy for Low-Frequency Excitations in Membrane Space Structures

2006 ◽  
Vol 128 (6) ◽  
pp. 790-797 ◽  
Author(s):  
Hiraku Sakamoto ◽  
K. C. Park
Keyword(s):  
Vibration Isolation ◽  
Controller Design ◽  
Low Frequency ◽  
Space Structures ◽  
Membrane Structures ◽  
Low Frequency Vibration ◽  
And Control ◽  
Structural Mass ◽  
The Web ◽  
Frequency Harmonic

The present study explores both structural and controller design to attenuate vibration in large membrane space structures, especially due to low-frequency harmonic excitations. It is very difficult for membrane structures to suppress the low-frequency vibration induced by flexible support structures, because a lightly prestressed membrane has extremely low mode frequencies and little damping effect. The present study proposes the use of weblike perimeter cables around a membrane, and the application of simple and lightweight active controllers only along the web cables in order to isolate the membrane from vibration. This strategy successfully reduces the membrane vibration when the web-cable configuration is appropriately tailored. Both linear and nonlinear finite-element analyses exhibit a clear tradeoff between structural mass and control efficiency.

High-Frequency Harmonic Effects on Low-Frequency Iron Losses

2014 ◽  
Vol 50 (11) ◽  
pp. 1-4 ◽  
Author(s):  
Lucian Petrea ◽  
Cristian Demian ◽  
Jean Francois Brudny ◽  
Thierry Belgrand
Keyword(s):  
High Frequency ◽  
Low Frequency ◽  
Iron Losses ◽  
High Frequency Harmonic ◽  
Frequency Harmonic
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