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Harmonic

About: Harmonic is a research topic. Over the lifetime, 44833 publications have been published within this topic receiving 495922 citations. The topic is also known as: overtone & partial.


Papers
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Journal ArticleDOI
TL;DR: In this article, the second harmonic of a Nd laser has been produced in LiIO3 in a phase matching direction of 30° to the c axis with high conversion efficiency.
Abstract: The second harmonic of a Nd laser has been produced in LiIO3 in a phase matching direction of 30° to the c axis with high conversion efficiency. The nonlinear optical coefficient t31 is among the highest so far reported for phase matchable substances using λ = 1.06 μ. LiIO3 can be grown from water solutions with excellent optical quality.

104 citations

Journal ArticleDOI
TL;DR: In this paper, a closed-form solution based on the use of two square wave functions to model stiffness change is proposed for bilinear oscillators under low-frequency excitation.
Abstract: A new closed-form solution based on the use of two square wave functions to model stiffness change is proposed for bilinear oscillators under low-frequency excitation. The solution procedure is extended to cases with bilinear forcing function, which usually occur in the dynamics of damaged structures. The proposed solution provides the spectral pattern and the magnitude of each harmonic component for a damaged rectangular beam according to the size and location of the crack. The predicted spectral pattern and the magnitude of each harmonic component for a simply supported beam containing a fatigue crack are validated by numerical simulation; experimental work has not been done. The results show that the proposed solution may be used to predict efficiently spectral patterns of damaged structures, while avoiding lengthy computation. Such a procedure may be developed into an attractive on-line diagnostic tool.

104 citations

Journal ArticleDOI
TL;DR: In this article, the contribution to the errors of a regularly sampling wattmeter caused by using n distinct instantaneous samples of the input signals taken at equal intervals of time is evaluated and discussed.
Abstract: The contribution to the errors of a regularly sampling wattmeter caused by using n distinct instantaneous samples of the input signals taken at equal intervals of time is evaluated and discussed. It is shown that although most of the possible harmonic products are handled correctly, a significant number of harmonic autoproducts and particularly of harmonic cross products are not, namely all the components of the nth, 2nth, 3nth, ... product harmonics. Sinusoidal waveforms are handled correctly, and the errors with near-sinusoidal waveforms are generally negligible. Two particular classes of non-sinusoidal waveforms are examined, those controlled by phase-angle switching and those associated with discharge lamps.

104 citations

Journal ArticleDOI
01 May 1994
TL;DR: In this paper, a single-phase active power filter based on calculation of the real part of the fundamental load current is proposed, which can maintain the input power factor close to unity and force the mains current to be a sinewave under distorted or nondistorted mains voltage.
Abstract: A new algorithm for a single-phase active power filter, based on calculation of the real part of the fundamental load current, is proposed in the paper. The algorithm proposed can maintain the input power factor of the mains close to unity and force the mains current to be a sinewave under distorted or nondistorted mains voltage. A prototype is developed and tested to verify its performance. The experimental results show that the algorithm proposed can compensate for the reactive power and suppress the harmonics of the nonlinear load effectively.

104 citations

Book
01 Feb 1994
TL;DR: The transducer output is proportionate to how fast the machine is moving (frequency) and how much the machine was moving (amplitude), the frequency describes what is wrong with the machine and the amplitude describes relative severity of the problem as discussed by the authors.
Abstract: The physical movement or motion of a rotating machine is normally referred to as vibration. Since the vibration frequency and amplitude cannot be measured by sight or touch, a means must be employed to convert the vibration into a usable product that can be measured and analyzed. Electronics, mechanics, and chemical physics are closely related. Therefore, it would logically follow that the conversion of the mechanical vibration into an electronic signal is the best solution. The means of converting the mechanical vibration into an electronic signal is called a transducer. The transducer output is proportionate to how fast the machine is moving (frequency) and how much the machine is moving (amplitude). The frequency describes what is wrong with the machine and the amplitude describes relative severity of the problem. The motion can be harmonic, periodic, and/or random. All harmonic motion is periodic. However, all periodic motion is not harmonic. Random motion means the machine is moving in an unpredictable manner.

103 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,223
20222,724
20211,878
20202,330
20192,612
20182,495