Results 251 to 260 of about 4,488,266 (309)
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High‐frequency response analysis via algebraic substructuring
International Journal for Numerical Methods in Engineering, 2008AbstractHigh‐frequency response analysis (Hi‐FRA) of large‐scale dynamical systems is critical to predict the resonant behavior of modern micro‐devices and systems operated over MHz or GHz frequency range. Algebraic substructuring (AS) is a powerful technique to extract a large number of natural frequencies. In this work, we extend the AS technique for
Ko, Jin Hwan, Bai, Zhaojun
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Frequency-Response Analysis of Torsional Dynamics
IEEE Transactions on Power Systems, 2004This paper introduces a frequency-domain approach for investigation of the phenomenon of torsional dynamics. The Nyquist criterion is adopted by the proposed method to identify stability regions with respect to torsional oscillations. This paper also introduces two performance indices to evaluate torsional dampings and propensity of the system to ...
A. Tabesh, R. Iravani
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2018
Transformers can be treated as a time-invariant system which can be characterized by its response to the Dirac's delta function. This impulse response is completely unique and should remain so over the system life. Therefore, it can be used as a kind of indicator to check if the internal compartments, elements or parameters have physically changed ...
Mehdi Bagheri, null Toan Phung
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Transformers can be treated as a time-invariant system which can be characterized by its response to the Dirac's delta function. This impulse response is completely unique and should remain so over the system life. Therefore, it can be used as a kind of indicator to check if the internal compartments, elements or parameters have physically changed ...
Mehdi Bagheri, null Toan Phung
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Evaluation methods of frequency response analysis
2018 International Interdisciplinary PhD Workshop (IIPhDW), 2018Reliable work of transformers in the power system affects the efficiency of power supplies to consumers. Each transformer should be subjected to periodic diagnostic tests in order to detect damage or prevent the development of defects, which may lead to excluding unit from operation.
Wojciech Szoka, Szymon Banaszak
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2013
Over the last few decades it has been recognized that Frequency Response Analysis (FRA) is a reliable method for detecting dimensional changes in the transformer windings. Out of the two methods of FRA, swept frequency response analysis (SFRA) has gained popularity over the impulse frequency response analysis (IFRA) with the passage of time, although ...
Sivaji Chakravorti +2 more
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Over the last few decades it has been recognized that Frequency Response Analysis (FRA) is a reliable method for detecting dimensional changes in the transformer windings. Out of the two methods of FRA, swept frequency response analysis (SFRA) has gained popularity over the impulse frequency response analysis (IFRA) with the passage of time, although ...
Sivaji Chakravorti +2 more
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On frequency response analysis of GPIO
2015 American Control Conference (ACC), 2015The Generalized Proportional Integral Observer (GPIO), which is a generalized high order Extended State Observer (ESO), has drawn much attention from both the industry and academia recently. This paper explores the characteristics of GPIO for the linear, time-invariant (LTI) plants using the frequency response method.
null Zhang Chao, null Zhu Jihong
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Frequency response analysis of slot coating
AIChE Journal, 2010AbstractFrequency responses to the slot die coating process is analyzed using empirical modal analysis to predict the effects of periodic process disturbances such as gap oscillation and variations in vacuum pressure, web velocity, and flow rate. A type of empirical modal analysis known as an experimental modal approach was used, and an oscillator ...
Takeaki Tsuda +2 more
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Optical Frequency-Response Analysis for Power Transformer
IEEE Transactions on Power Delivery, 2021An optical frequency-response analysis (OFRA) method is proposed to detect the winding deformation in a power transformer. Compared to existing frequency-response analysis (FRA) systems, the proposed system has several unique merits, such as high immunity to electromagnetic interference, direct display of winding deformation, no influence of connected ...
Guoming Ma +5 more
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Frequency response modeling for device analysis
IEEE 2002 28th Annual Conference of the Industrial Electronics Society. IECON 02, 2003In many industrial activities, the assessment of the good condition of the devices involved in these activities is an important issue. The condition assessment is usually carried out taking some measurements of the device and postprocessing them somehow.
J. Pleite +4 more
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