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Coded excitation for ultrasound tissue harmonic imaging
Ultrasonics, 2010 Coded excitation can improve the signal-to-noise ratio (SNR) in ultrasound tissue harmonic imaging (THI). However, it could suffer from the increased sidelobe artifact caused by incomplete pulse compression due to the spectral overlap between the fundamental and harmonic components of ultrasound signal after nonlinear propagation in tissues.
Tai-Kyong Song, Yang Mo Yoo
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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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Chaos in a Harmonically Excited Elastic Beam
Journal of Applied Mechanics, 1986Numerical integration of the equations for the evolution of amplitudes of a harmonically forced simply supported elastic beam indicates that for certain values of the frequencies of excitation the response of the beam may be chaotically modulated. In an attempt to confirm the presence of chaos, the Lyapunov exponents have been calculated for two cases ...
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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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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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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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A Harmonic Excitation System for Turbine Generators
Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems, 1962A harmnonic excitation system, as the name implies, utilizes the harmonic power developed in a generator to selfexcite it. By means of a separate stator winding, this power is captured and controlled and rectified with a magnetic amplifier and silicon rectifiers. Protective features are included to prevent loss of excitation in the event of a rectifier
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Self-Excitation and Harmonics in Wind Power Generation
Journal of Solar Energy Engineering, 2005Traditional wind turbines are commonly equipped with induction generators because they are inexpensive, rugged, and require very little maintenance. Unfortunately, induction generators require reactive power from the grid to operate; capacitor compensation is often used.
Eduard Muljadi +3 more
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