Results 241 to 250 of about 189,622 (293)
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Distribution transformer excitation harmonics
Electric Power Systems Research, 1989Abstract All identifiable sources of harmonics should be investigated and documented since harmonic content is increasing on power circuits. In this research 123 randomly selected 15, 25 and 50 kVA transformers were tested for total harmonic distortion (THD) and harmonic identification. Current data from each transformer was obtained at rated and 110%
Lynnda K. Ell, M.Earl Council
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Harmonic Golay coded excitation based on harmonic quadrature demodulation method
2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2008Harmonic coded excitation techniques have been used to increase SNR of harmonic imaging with limited peak voltage. Harmonic Golay coded excitation, in particular, generates each scan line using four transmit-receive cycles, unlike conventional Golay coded excitation method, thus resulting in low frame rates.
Sang-Min, Kim +2 more
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Impacting under harmonic excitation
Journal of Sound and Vibration, 1979Abstract The steady state response of a one dimensional linear oscillator impacting under harmonic excitation on to rigid obstructions with a coefficient of velocity restitution is investigated. Numerical experiments are discussed and an expression of the steady state velocity for one sided impacting is derived.
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Aircraft Engineering and Aerospace Technology, 1939
IN a paper on airscrew‐blade vibration, published in the Journal of the Royal Aeronautical Society lor September, 1937, the author gave brief descriptions of different designs of the same general typo of mechanism for exciting harmonic torques in airscrew drives for experimental purposes.
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IN a paper on airscrew‐blade vibration, published in the Journal of the Royal Aeronautical Society lor September, 1937, the author gave brief descriptions of different designs of the same general typo of mechanism for exciting harmonic torques in airscrew drives for experimental purposes.
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Harmonic excitation of bolted joints
2023Bolted joints provide one of the most common means of joining two structural components together. The joints themselves use friction to transmit force, torque and motion across a common interface from one component to another. In many cases a pretensioned bolt, running through a common hole at the joint interface, provides the clamping force.
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International Journal of Structural Stability and Dynamics, 2019
A direct eigenvalue analysis approach for solving the stability problem of periodically supported beams with multi-mode coupling vibration under general harmonic excitations is developed based on the Floquet theorem, Fourier series and matrix eigenvalue analysis.
Ying, Z. G., Ni, Y. Q., Fan, L.
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A direct eigenvalue analysis approach for solving the stability problem of periodically supported beams with multi-mode coupling vibration under general harmonic excitations is developed based on the Floquet theorem, Fourier series and matrix eigenvalue analysis.
Ying, Z. G., Ni, Y. Q., Fan, L.
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Parasitic excitation of fundamental-cyclotron-harmonic waves in high-harmonic gyrotrons
Physics of Plasmas, 2021A typical problem of the development of high-harmonic short-wavelength gyrotrons, namely, the competition between the operating wave and a parasitic fundamental-harmonic wave, is studied. A specific case of the excitation of a far-from-cutoff parasitic wave in the backward-wave oscillator regime is considered.
Yuriy K. Kalynov +2 more
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Covariant harmonic oscillators and diffractive excitations
Physical Review D, 1975We use convariant harmonic-oscillator wave functions to describe quark-model hadrons in Glauber's model of diffractive scattering. It is shown that the Glauber model can be constructed in the center-of-mass system in terms of fully covariant quantities.
Y. S. Kim, Marilyn E. Noz
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Second-harmonic resonance with Faraday excitation
Wave Motion, 1997zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Forster, G. K., Craik, A. D. D.
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Coded excitation for harmonics imaging
1996 IEEE Ultrasonics Symposium. Proceedings, 2002For harmonics imaging, coded and chirped low level excitations are investigated in order not to break the microballoon contrast agent, and not to cause spectrum leakage via nonlinear propagation distortion of the transmission pulse. A half frequency square-root amplitude apodized signal is proposed to match to the harmonic domain matched filter after ...
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