Relevant bibliographies by topics / Harmonická

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Harmonická'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Harmonická"

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Wu, Shan-He, Imran Abbas Baloch, and İmdat İşcan. "On Harmonically(p,h,m)-Preinvex Functions." Journal of Function Spaces 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/2148529.

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We define a new generalized class of harmonically preinvex functions named harmonically(p,h,m)-preinvex functions, which includes harmonic(p,h)-preinvex functions, harmonicp-preinvex functions, harmonich-preinvex functions, andm-convex functions as special cases. We also investigate the properties and characterizations of harmonically(p,h,m)-preinvex functions. Finally, we establish some integral inequalities to show the applications of harmonically(p,h,m)-preinvex functions.
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Zhou, Xue Song, Guang Zhu Chen, and You Jie Ma. "A Survey on Detecting Methods for Harmonic of Power System." Advanced Materials Research 614-615 (December 2012): 907–10. http://dx.doi.org/10.4028/www.scientific.net/amr.614-615.907.

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This paper describes Detecting Methods for Harmonics of power system has been considered one of the serious harms for power system. The research of harmonics has obtained high attention among people. The researches of harmonics detection have many methods, such as Based on Fryze theory of harmonic power detection, Instantaneous reactive power theory detection method, Fourier Transformation harmonic detection method, wavelet transform detection method, neural networks harmonic detection method etc. Aiming at harmonic detection, the different detection methods of power system harmonics are summarized and compared. This paper reviews the existing harmonic detection methods, and discuss their advantages and disadvantages in terms of detection accuracy and response speed, and finally summarizes the development trend of the harmonic detection method.
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Markulin Konfic, Lucija. "Sedmi harmonik u glazbeno-teorijskom sustavu Giuseppea Michelea Stratica." Bosnian / Croatian / Serbian, no. 10 (October 22, 2018): 317–27. http://dx.doi.org/10.51515/issn.2744-1261.2018.10.1.317.

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Problem sedmog harmonika je tema kojoj su u glazbenoj teoriji 18. stoljeća pristupali s posebnim interesom. Dok su ga jedni potpuno ignorirali, drugi odbacivali, neki su autori izrazili stav prema kojem se septima bazirana na tom harmoniku smatra prijelaznim oblikom između konsonanci i disonanci, ili čak konsonancom. Giuseppe Michele Stratico u svom je glazbenom sustavu, razrađenom u više verzija njegovih rukopisnih traktata (sačuvanih u Biblioteci Marciana, Venezia I-Vnm), prihvatio sedmi harmonik kao dio konsonantnog sustava što je dalo osnovu za daljnju razradu sustava temeljenog na odnosima i proporcijama. U ovom radu dati će se pregled Straticovog rada na području glazbene teorije s posebnim osvrtom na problem sedmog harmonika, uspoređujući njegov stav o tom problemu s drugim značajnim teoretičarima 18. stoljeća. U prvom redu s teoretičarima padovanske škole, Giuseppeom Tartinijem, Straticovim učiteljem, te Francescantonijem Vallottijem, zatim matematičarem grofom Giordanom Riccatijem, te jednim od najvećih znanstvenika 18. stoljeća Leonhardom Eulerom.
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Alhaj, Hussam M. M., Nursyarizal Mohd Nor, Vijanth S. Asirvadam, M. F. Abdullah, and T. Ibrahim. "Time Delay Measurement Compensation in Harmonic State Estimation." Applied Mechanics and Materials 699 (November 2014): 745–50. http://dx.doi.org/10.4028/www.scientific.net/amm.699.745.

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The proliferation of power electronics equipments generates harmonics distortion problem. Harmonics have many effects to the power system grid and the main limitation of harmonics is heating of power system devices. To monitor and mitigate the harmonics, the source location and the level of harmonics should be known. However, harmonic measurements are costly and is not practical to put harmonic measurement in each location in the grid. Hence, harmonic state estimation is needed. The most common method in harmonic state estimation is singular value decomposition (SVD). A time delay of the measurements can affect the SVD performance, therfore,this paper presents a prediction method based on ARX model and modified normalized least mean square to compensate the time delay measurements. The result shows better performance of the proposed method as compared to least mean square.
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Zhang, Feng, Jue Long Li, Chong Feng Tian, Zong Jie Liu, Hai Feng Ye, and Xiu Chen Jiang. "Binary Scale Time Windows FFT for Harmonic Analysis." Applied Mechanics and Materials 448-453 (October 2013): 2003–10. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.2003.

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Various harmonics exist in the electrical power system, and the harmonics include both integer harmonics and non-integer harmonics. It is hard to analyze all the harmonics accurately. In order to improve the precision of harmonic analysis and the minimum resolution, this paper presents a new algorithm named binary scale time windows FFT based on traditional algorithm.This algorithm considers the calculative time and precision well. The results of the test indicate that this algorithm can both guarantee the accuracy and raise the resolving power in the harmonic analysis without increasing the hardware level and the time of calculation obviously. It can restrain the increasingly serious harmonic pollution in power system effectively.
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Wang, Guishuo, Xiaoli Wang, and Chen Zhao. "An Iterative Hybrid Harmonics Detection Method Based on Discrete Wavelet Transform and Bartlett–Hann Window." Applied Sciences 10, no. 11 (June 5, 2020): 3922. http://dx.doi.org/10.3390/app10113922.

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The current signal harmonic detection method(s) cannot reduce the errors in the analysis and extraction of mixed harmonics in the power grid. This paper designs a harmonic detection method based on discrete Fourier transform (DFT) and discrete wavelet transform (DWT) using Bartlett–Hann window function. It improves the detection accuracy of the existing methods in the low frequency steady-state part. In addition, it also separates the steady harmonics from the attenuation harmonics of the high frequency part. Simulation results show that the proposed harmonic detection method improves the detection accuracy of the steady-state part by 1.5175% compared to the existing method. The average value of low frequency steady-state amplitude detection of the proposed method is about 95.3375%. At the same time, the individual harmonic components of the signal are accurately detected and recovered in the high frequency part, and separation of the steady-state harmonics and the attenuated harmonics is achieved. This method is beneficial to improve the ability of harmonic analysis in the power grid.
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Gong, Chen Bin, Qing Hao Wang, Gang Chen, En Lu Wang, Tian Shu Hai, Xin Yu Li, Bo Li, Xue Wang, Chen Yang Liu, and Qi Dong Zhao. "Research on Harm of Harmonics on Electrical Equipment." Advanced Materials Research 986-987 (July 2014): 1846–49. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1846.

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Through the analysis of harmonics caused by transformer, capacitor, electromagnetic voltage transformer and other accident, harmonics is an important indicator of power quality, which has been included in the “pollution" of power grid is found. In order to understand the harmonic, this paper from the concept of quality of electric energy, and then gradually extended to the field of harmonics. This paper firstly introduces the various reasons and equipment may produce harmonic, Secondly, illustrate harm of harmonic to operation of transformers, capacitors, electromagnetic voltage transformers and other electrical equipment, let more people know and understand the relevant knowledge of the harmonic, In order to save technical force and provide scientific basis for future effective harmonic.
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Zhao, Yong, Zi Long Yang, Du Feng Cao, Yi Bo Wang, and Hong Hua Xu. "Analysis of PCC Point Harmonics Caused by Nonlinearities of Grid-Tied PV Inverters." Advanced Materials Research 1070-1072 (December 2014): 1246–52. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.1246.

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Renewable energy are usually connected to the power grid through an inverter. As the penetration level of such inverter-based distribution generation resources increases, PCC point harmonics become an important concern for grid stability and power quality. In this paper, the PCC-point harmonics in a parallel-inverter-based photovoltaic station were measured and some significant characteristics of such harmonics were presented. These harmonics are stationary; the voltage and current waveforms are lower frequency, power correlation and inter-harmonic. And these harmonics are 3-phase symmetric and contain 3rd and 6th harmonic components. The transitions of the PCC harmonic occurrence and vanishing are instantaneous. The analysis indicates that the PCC harmonics are not produced by the resonances related to the linearities of PV inverters but the inverter nonlinearities are the primary reasons. The strategy to eliminate the PCC point harmonics are proposed in this study.
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Vijayalakshmi, V. J., C. S. Ravichandran, and A. Amudha. "Predetermination of Higher Order Harmonics by Dual Phase Analysis." Applied Mechanics and Materials 573 (June 2014): 13–18. http://dx.doi.org/10.4028/www.scientific.net/amm.573.13.

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Previous research was mainly concentrated on eliminating the selected lower order harmonics depending on the level of inverter which was assumed to be high. The harmonics may be present even in the higher order also. The analysis of harmonic spectrum by Finite Fourier Transform yields a very accurate result for lower order harmonics. For obtaining accurate Total Harmonic Distortion (THD) value and the harmonic spectrum, inclusion of higher order harmonics is essential. The method for accurate estimation is proposed in this paper. In normal practice, the higher order harmonics present in the output of the inverter are suppressed by using filters. In order to obtain more optimized higher order harmonics, it is necessary to obtain an accurate assessment of the higher order spectrum. The higher order spectrum is predetermined by proposed technique termed as Dual Phase Analysis (DPA) so as to obtain more optimized switching angles with the application of any Optimization Technique. This is an effective tool to analyze the various higher order components of the harmonic spectrum.
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Qin, Xuelong, Guoqiang He, Xuexia Yang, and Steven Gao. "A Compact Rectifier Design Method Utilizing Harmonics." Applied Sciences 11, no. 5 (March 5, 2021): 2295. http://dx.doi.org/10.3390/app11052295.

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This paper proposes a compact rectifier design method for utilizing harmonics. Based on total reflection generated by pure reactance loads at the second harmonic (2nd) and open circuit at the third harmonic (3rd), a compact DC-pass filter is designed to effectively utilize the 2nd and 3rd harmonics excited by the rectifying diode. The amplitudes of the harmonics can be controlled by adjusting the input impedances of the DC-pass filter at harmonics. A prototype operating at 5.8 GHz fundamental frequency is implemented and measured to validate the scenario. When the input power is 18.3 dBm, the measured rectifying efficiency is 71.3%, while the 2nd and the 3rd harmonic amplitudes are −2.4 dBm and 0.1 dBm respectively. This method could also be extended to design a rectifier only utilizing the 2nd or the 3rd harmonic.
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Dissertations / Theses on the topic "Harmonická"

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Andělová, Aneta. "Různá hudebně teoretická pojetí harmonické funkce." Master's thesis, Akademie múzických umění v Praze.Hudební a taneční fakulta. Knihovna, 2018. http://www.nusl.cz/ntk/nusl-391649.

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Master thesis is focused on one of the themes of musical theory, which are harmonic functions. First, it deals with the origin, general characteristics and marking of harmonic functions. In connection with the theme, mention is also made of harmonic dualism and monism. The main chapter deals first with the occurrence of the term of harmonic function in selected Czech and foreign dictionaries, it is also focused on concepts of publications and studies. Part of the thesis is a concept of its own, which is based on the analysis of period literature. Master thesis is intended to introduce the way of thinking and the concept of individual authors.
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Brada, Michal. "Polohovací jednotka pro laserovou spektroskopii." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230385.

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This diploma thesis deals with design of positioning unit for laser spectroscopy and its realization to shape of prototype. The design of positioning unit is based on the analysis of the current state of knowledge in the field of remote laser spectroscopy systems. Precise harmonic drive and worm drive with stepper motors are used to drive. The main parts of positioning unit are designed primarily from duraluminium. The positioning unit will be used for experimental measurements at the Institute of Physical Engineering Faculty of Mechanical Engineering Brno University of Technology. 3D digital prototype and technical drawings were created in Autodesk Inventor 2010.
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Trzos, Michal. "Moderní metody borcení časové a kmitočtové osy zvukových signálů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-233630.

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Tato práce se zabývá reprezentací nestacionárních harmonických signálů s časově proměnnými komponentami. Primárně je zaměřena na Harmonickou transformaci a jeji variantu se subkvadratickou výpočetní složitostí, Rychlou harmonickou transformaci. V této práci jsou prezentovány dva algoritmy využívající Rychlou harmonickou transformaci. Prvni používá jako metodu odhadu změny základního kmitočtu sbírané logaritmické spektrum a druhá používá metodu analýzy syntézou. Oba algoritmy jsou použity k analýze řečového segmentu pro porovnání vystupů. Nakonec je algoritmus využívající metody analýzy syntézou použit na reálné zvukové signály, aby bylo možné změřit zlepšení reprezentace kmitočtově modulovaných signálů za použití Harmonické transformace.
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Čepica, Vojtěch. "Posouzení vlivu tuhosti ložiskových štítů a kvality vyvážení na vibrace synchronního generátoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254405.

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The main focus of my master thesis is the assessment of effects of the bearing shields stiffness and balance quality on synchronous generator vibration. The incentive of writing the thesis is the problematic situation, which is characterized by synchronous generator vibration. The aim of my thesis is to variate shields stiffness and to find out the dependence of vibration on stiffness during nominal speed. I have used the program ANSYS based on finite element method to solve this problem.
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Kratochvíl, Petr. "Pevnostní analýza skříně alternátoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231727.

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In this diploma thesis is theoretically described and then practically performed stress analysis of alternator body, which in terms of traffic racing car often passes into disrepair. It is used reverse engineering method. The real part is converted to digital model and analysed using FEM calculation. Incoming data for FEM are obtained by experimental measurement on the car.
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Lukáš, Jan. "Analýza vlivu tlumení na velikost odezvy při dynamickém buzení světlometu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-418211.

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The aim of the submitted diploma thesis is the magnitude determination of the headlamp response to the dynamic excitation. Currently it is necessary to measure this response, because it is one of the assessed criteria of quality of the headlamp. When comparing results of the experimental measurement and the computational modelling, a good consensus of resonant frequencies is observed, but there are significant differences in acceleration amplitudes. The cause of this is the variable damping value. The theoretical part of the thesis deals with polymeric materials, basics of oscillation and damping. It serves to understand the mechanisms, which influence the results of the experimental measurement. The practical part is dedicated to the procedure of the computational modelling and the experimental measurement implementation. The analysis of the experimental measurement results leads to an ascertainment of nonlinearities, which influence the headlamp behaviour. The results of a sensitivity analysis of the computational modelling are used to create curves, on the basis of which the damping is estimated. The inclusion of the estimated damping into computational modelling leads to reduction of the compared differences of the acceleration amplitudes. The conclusion of the thesis contains the recommendation for the damping determination during the computational modelling of the headlamp.
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Blaha, Adam. "Stanovení dynamických vlastnosti rotoru turbodmychadla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231303.

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This diploma thesis deals with dynamic behaviour of a turbocharger rotor. The subject is a stock turbocharger for commercial vehicles. The research will be mentioned in the first part of the thesis as well as methods of processing. The second, practical part is divided into two divisions. They are both experimental and computational. The aim is finding of rotordynamic behaviour by an experiment and its comparing with a computational model in ANSYS software. Modal and harmonic analysis of a free and fixed subject will be used by both experiment and evaluation. The subject will be fixed where bearings are located during harmonic analysis. All the experimental results will be processed with mathematical and physical methods like FFT analysis or Campbel diagram. There will be two main types of computational models to choose among. These models will be analyzed in detail. The goal of the thesis is to reach results from ANSYS as close as possible with the experimental testing. This includes finding correct material and physical properties, right choice of mesh and right boundary conditions. At the same time the CPU time compared to the model complexity and results accuracy will be considered in a comparison with data obtained by the experiment.
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Fürich, Adam. "Optimalizace skříně převodovky pro elektrická vozidla z ohledem na vyzařovaný hluk." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-449782.

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This thesis deals with the vibration and noise of the gearbox for an electric vehicle. The gearbox itself acts as an emitter of unwanted noise caused by vibration excitation of the internal components of the gearbox. It is therefore necessary to deal with a complex unit such as the gearbox at system level as soon as it is being designed. This can be achieved using analytical tools and software. In this thesis, in order to evaluate the validity of the designed gearbox, a procedure is developed using both technical experiment and numerical simulations. The effect of the bolt preload is not overlooked for the following computational modelling dealing with the radiated noise of the gearbox. The results obtained from the performed technical experiments were then evaluated and compared with the results of the computational models. In this way, it is possible to compare the different approaches, their limitations and weaknesses. Furthermore, the thesis deals with design modifications that are analyzed using computational modeling. The thesis is concluded with a brief description of the application of each approach and an evaluation of the gearbox design modifications.
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Gajzler, Jakub. "Mikrovlnné výkonové zesilovače s vysokou účinností - laboratorní úloha." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217535.

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This Diploma thesis deals with methods that increase efficiency of transistor amplifiers. In the first part of the thesis we describe theoretical background of the constructions of power amplifiers. At first we deal with the classical method that is concerned with a change of position of the static operating point. Secondly we cover the multi harmonic manipulation method (MHM). This method is concerned with a proper loading of particular harmonic components and consequential shaping of voltage runs and currents on the collector. In the second part of the work we have constructed the substitutes of particular accesses. Constructed classes are AB, F and FMHM. Basic S parameters and output signal spectrum were measured. We can see from the calculated efficiencies AB = 11%, F = 16% a Fmhm = 18%, big increase of efficiency F and FMHM only by changing output network.
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David, Jan. "NVH převodového ústrojí pro elektromobily." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-433548.

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This master’s thesis deals with determination of NVH parameters of the gearbox housing for electric vehicle. The introduction part is focused on the theoretical knowledge of this issue. Subsequently, the deviations of geometry on the gearbox were measure by 3D scan method. The next part of thesis is focused on the modal analysis, which is solved by numerical approach and followed by experimental verification. During the numerical calculation solving, the influence of the screw preloading on the modal properties of the structure, was also taken into account. Numerical harmonic analysis was then performed and the results were compared with the experimental approach. The conclusion is devoted to material damping and comparison of the individual results.
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Books on the topic "Harmonická"

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Freeden, Willi. Continuation of spherical harmonics and approximation by spherical harmonic expansions. Columbus, Ohio: Ohio State University, Dept. of Geodetic Science and Surveying, 1985.

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Hannan, Charles R. Predictive techniques in annual harmonics: Predictive techniques and the annual harmonic chart, harmonic progressions and life cycles. Tempe, Ariz: American Federation of Astrologers, 1986.

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Hamblin, David. Harmonic charts: Understanding and using the principle of harmonics in astrological interpretation. Wellingborough, Northamptonshire: Aquarian Press, 1987.

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Harmonics. Calgary: Freehand Books, 2009.

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Ferguson, Jesse Patrick. Harmonics. Calgary: Freehand Books, 2009.

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Ptolemy. Harmonics. Leiden: Brill, 2000.

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Karas, Simōn I. Harmonika. Athēnai: Syll. pros Diadosin tēs Ethnikēs Mousikēs, 1989.

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Frost, Allen. Harmonica. [Bellingham, Wash: A. Frost, 2001.

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Gárdonyi, Zsolt. Harmonik. Wolfenbüttel: Möseler, 2002.

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Harmonic. Brisbane, Qld: Interactive Press, 2008.

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Book chapters on the topic "Harmonická"

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Avery, John. "Harmonic Polynomials, Hyperspherical Harmonics, and Sturmians." In Fundamental World of Quantum Chemistry, 261–96. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0113-7_11.

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Chattopadhyay, Surajit, Madhuchhanda Mitra, and Samarjit Sengupta. "Harmonics." In Power Systems, 17–34. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0635-4_4.

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Weik, Martin H. "harmonic." In Computer Science and Communications Dictionary, 713. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_8240.

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Ko, Dong Hyuk, Kyung Taec Kim, Juyun Park, Jae-hwan Lee, and Chang Hee Nam. "Generation of Ultrashort Attosecond High-Harmonic Pulses from Chirp-compensated Ne Harmonics." In Springer Proceedings in Physics, 197–202. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1186-0_20.

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Avery, John. "Harmonic Polynomials." In Hyperspherical Harmonics, 1–10. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2323-2_1.

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Avery, John. "Symmetry-Adapted Hyperspherical Harmonics." In Hyperspherical Harmonics, 141–73. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2323-2_10.

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Avery, John. "The Adiabatic Approximation." In Hyperspherical Harmonics, 175–88. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2323-2_11.

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Avery, John. "Generalized Angular Momentum." In Hyperspherical Harmonics, 11–24. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2323-2_2.

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Avery, John. "Gegenbauer Polynomials." In Hyperspherical Harmonics, 25–46. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2323-2_3.

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Avery, John. "Fourier Transforms in D Dimensions." In Hyperspherical Harmonics, 47–57. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2323-2_4.

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Conference papers on the topic "Harmonická"

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Arghandeh, Reza, Ahmet Onen, Jaesung Jung, Danling Cheng, Robert Broadwater, and Virgilio Centeno. "Harmonic Impact Study for Distributed Energy Resources Integrated Into Power Distribution Networks." In ASME 2013 Power Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/power2013-98150.

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Smart realization involves a steady increase in inverter-based components like Distributed Energy Resources (DER), energy storage systems, and plug-in electric vehicles. The harmonics related to DER inverters and the spread of power electronic devices raises concerns for utilities and customers. Harmonics can create component failures, thermal losses and control system malfunctions. In this paper the authors analyze the impact of multi-source harmonics from DERs inside distribution networks. The harmonics impacts are evaluated by harmonic measurement indices. Harmonic emission in a real distribution circuit is simulated with the help of power flow analysis. The results are presented with visualization techniques to give a better picture of harmonic propagation vs. different levels of harmonic source magnitude and angle. Due to effect of harmonic on network efficiency, a sensitivity analysis considering power factors is conducted.
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Kuznetsov, Sergey, Sergey Kuznetsov, Yana Saprykina, Yana Saprykina, Boris Divinskiy, and Boris Divinskiy. "PHYSICAL INTERPRETATION OF WAVE BREAKING CRITERIA." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b4315241f49.

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On the base of experimental data it was revealed that type of wave breaking depends on wave asymmetry against the vertical axis at wave breaking point. The asymmetry of waves is defined by spectral structure of waves: by the ratio between amplitudes of first and second nonlinear harmonics and by phase shift between them. The relative position of nonlinear harmonics is defined by a stage of nonlinear wave transformation and the direction of energy transfer between the first and second harmonics. The value of amplitude of the second nonlinear harmonic in comparing with first harmonic is significantly more in waves, breaking by spilling type, than in waves breaking by plunging type. The waves, breaking by plunging type, have the crest of second harmonic shifted forward to one of the first harmonic, so the waves have "saw-tooth" shape asymmetrical to vertical axis. In the waves, breaking by spilling type, the crests of harmonic coincides and these waves are symmetric against the vertical axis. It was found that limit height of breaking waves in empirical criteria depends on type of wave breaking, spectral peak period and a relation between wave energy of main and second nonlinear wave harmonics. It also depends on surf similarity parameter defining conditions of nonlinear wave transformations above inclined bottom.
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Kuznetsov, Sergey, Sergey Kuznetsov, Yana Saprykina, Yana Saprykina, Boris Divinskiy, and Boris Divinskiy. "PHYSICAL INTERPRETATION OF WAVE BREAKING CRITERIA." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b94019210f7.30842240.

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On the base of experimental data it was revealed that type of wave breaking depends on wave asymmetry against the vertical axis at wave breaking point. The asymmetry of waves is defined by spectral structure of waves: by the ratio between amplitudes of first and second nonlinear harmonics and by phase shift between them. The relative position of nonlinear harmonics is defined by a stage of nonlinear wave transformation and the direction of energy transfer between the first and second harmonics. The value of amplitude of the second nonlinear harmonic in comparing with first harmonic is significantly more in waves, breaking by spilling type, than in waves breaking by plunging type. The waves, breaking by plunging type, have the crest of second harmonic shifted forward to one of the first harmonic, so the waves have "saw-tooth" shape asymmetrical to vertical axis. In the waves, breaking by spilling type, the crests of harmonic coincides and these waves are symmetric against the vertical axis. It was found that limit height of breaking waves in empirical criteria depends on type of wave breaking, spectral peak period and a relation between wave energy of main and second nonlinear wave harmonics. It also depends on surf similarity parameter defining conditions of nonlinear wave transformations above inclined bottom.
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Feng, Xingya, Richard H. J. Willden, Binzhen Zhou, and Thomas A. A. Adcock. "Numerical Analysis of Nonlinear Wave Loads on an Offshore Wind Turbine Monopile." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95161.

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Abstract Highly nonlinear extreme waves are the major, often the dominant, environmental load on offshore wind turbines. The higher-order ‘ringing’ loads associated with the nonlinear waves can cause unexpected resonance of the monopile. Hydrodynamic analysis of these harmonic loads remains a challenge due to the difficulty in extracting the bound harmonics from the force spectrum in an extreme wave event. A phase manipulation approach (four-phase combination) has been recently demonstrated to be able to separate the higher harmonic components of the wave loads in tank tests. In this work, we employ a fully nonlinear potential flow based Numerical Wave Tank (NWT) to simulate the wave diffraction by a fixed vertical column. We present a detailed study of our checks on the numerical accuracy of our model. Phase control is implemented for the wavemaker to manipulate the phase of each wave component. Focused wave groups are generated to represent the incoming extreme waves. With the four-phase decomposition, the higher harmonics of the wave loads are shown to be clearly separated. Comparisons with the existing test results show fairly good agreement at higher harmonics. The structure of the harmonic forces and moments are analysed and we reconstruct the higher harmonics based on the Stokes expansion assumption using the linear force. In addition, the effects of wave steepness on the harmonic components are discussed.
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Kim, HyungTae, KyungChan Jin, and SeungTaek Kim. "Frequency Analysis and Interpolated Spectra of Time-Limited Samples in 3D RF Imaging." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36576.

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Fast Fourier Transform (FFT) calculates integer harmonic components, but ignores other frequency components such as non-integer harmonics and non-harmonics. In a practical sampling problem, the length of a sampled signal is finite and the sampling time is minimized. Therefore, it is necessary for interpolation to improve the accuracy of frequency analysis considering 1/m harmonic components and zero-padding (ZP) technique. The proposed method was applied to a 3D RF profile measurement system and the resolution was improved to 1/m.
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Rastegar, Jahangir, Dake Feng, and Lin Hua. "On the Relationship Between the Harmonic Amplitudes of the Output Motion of Closed-Loop Linkage Mechanisms." In ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/detc2008-49537.

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It is well known that due to the nonlinearity of the kinematics of linkage mechanisms, their output motion contains harmonics of the input motion. In most mechanisms, the generated high harmonic components in the output motion are the main source of vibration excitation that the mechanism imparts on the overall system, including its own structure. For simple linkage mechanisms such as slider-cranks and four-bar linkage mechanisms, the amplitudes of the harmonics of the output motion for constant input rotation have been derived. In the present study, it is shown that certain relationships exist between the amplitudes of the harmonic of the output motions. In particular, odd and even harmonic amplitudes are shown to be related through an inequality relationship. These relationships are due to the basic characteristics of the linkage mechanisms motions, which are significantly simplified for certain linkage geometries. The relationships between the amplitudes of the output velocity harmonics are derived for slider-crank and four-bar linkage mechanisms.
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N. S. da Silva, Maise, Rafael S. Salles, Alexandre Degan, Carlos A. Duque, and Paulo F. Ribeiro. "Investigation of Harmonic Current Aggregation in the TBE/Eletronorte Transmission System." In Congresso Brasileiro de Automática - 2020. sbabra, 2020. http://dx.doi.org/10.48011/asba.v2i1.1725.

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Harmonic distortions are not new problems in electrical power systems. However, electrical networks have undergone several changes in recent decades, such as the wide range of electronic devices (converters, control devices, etc.), and those equipment produce emission of harmonic currents. The investigation of the contribution of several sources of harmonics in power systems is essential, considering that it is a problem of power quality that cannot be neglected. Thispaper aims to investigate the aggregation of harmonic currents in a 230kV TBE/Eletronorte system. For this, the transmission system was modeled using MATLAB/Simulink software with the typical values provided by TBE. A vectorial analysis was performed for the three-phase system and a sum analyzes of harmonics from different sources on Phase A, to estimate the influence of those current sources on Castanhal and Guama buses, when a harmonic spectrumis present on Vila do Conde and Utinga buses. In both analyzes, a phase angle spectrum of 10 and 20 degrees was applied in the harmonic source of Utinga. The summation analyzes proved to be useful because it can estimate values that harmonic currents can assume, for different conditions, and can be very useful in the planning stage to avoid estimation errors.
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Wang, Dingxi, Sen Zhang, Xiuquan Huang, and Huang Huang. "Coupled Time and Passage Spectral Method for an Efficient Resolution of Turbomachinery Far Upstream Wakes." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59563.

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Abstract The paper proposes a novel numerical method called coupled time and passage spectral method for an efficient resolution of far upstream wakes in an unsteady analysis of flow field within generic multiple blade rows. The proposed method is a very simple and natural extension of the time spectral form harmonic balance method. By including inter blade phase angle and passage index in a truncated Fourier series, the proposed method is capable of circumventing the limitations of the harmonic balance method in dealing with zero frequency harmonics and time harmonics with same frequency but different inter blade phase angles. Different from the harmonic balance method, which seeks solution at different time instants of the same passage, the coupled spectral method seeks solutions at different passages and time instants. Same as the harmonic balance method, all these solutions are connected via a spectral operator. Coupled time and passage sampling is performed using the modified Gram Schmidt process to choose the time and passage pairs which give the most orthogonal rows of an inverse Fourier transform matrix. The coupled time and passage spectral method requires minimum change to an existing harmonic balance solver. A numerical case study has been provided in the paper to demonstrate the expected capability against the harmonic balance method.
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Afzali, Fatemeh, Gizem D. Acar, and Brian F. Feeny. "Response Characteristics of Systems With Two-Harmonic Parametric Excitation." In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-86140.

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Floquet theory is combined with harmonic balance to study parametrically excited systems with two harmonics of excitation, where the second harmonic has twice the frequency of the first one. An approximated solution composed of an exponential part with unknown exponents and a periodic term consisting of a truncated Fourier series is considered. When applied to a two-harmonic Mathieu equation the analysis shows that the second harmonic alters stability characteristics, particularly in the primary and superharmonic instabilities. We also look at the initial conditions response and its frequency content. The second excitation harmonic in the system with parametric damping is seen to disrupt the coexistence phenomenon which is observed in the single-harmonic case.
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Ge, Q. J., and J. Rastegar. "Trajectory Generation for High-Speed Machinery With Minimal Residual Vibration Using Low-Harmonic Rational Curves." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0093.

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Abstract For a given high-speed machinery, a significant source of the internally induced vibrational excitation is the presence of high frequency harmonics in the trajectories that the system is forced to follow. We develop a method for synthesizing a low-harmonic joint trajectory to reduce the potential vibration and related control problems using low-harmonic rational curves. Continuity conditions for these curves are studied and are used to develop a geometric algorithm for designing low-harmonic rational spline curves. Finally, we discuss how these low-harmonic curves may be used for trajectory generation of high-speed machinery with minimal residual vibration.
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Reports on the topic "Harmonická"

1

Freeden, W. Computation of Spherical Harmonics and Approximation by Spherical Harmonic Expansions,. Fort Belvoir, VA: Defense Technical Information Center, February 1985. http://dx.doi.org/10.21236/ada160445.

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Jain, A. Harmonic Coils. Office of Scientific and Technical Information (OSTI), April 1997. http://dx.doi.org/10.2172/1661616.

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Barnes, P. D. B1 magnet harmonics. Office of Scientific and Technical Information (OSTI), May 2000. http://dx.doi.org/10.2172/15005727.

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Caspi, S., M. Helm, and L. J. Laslett. 3D field harmonics. Office of Scientific and Technical Information (OSTI), March 1991. http://dx.doi.org/10.2172/5232433.

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Torroba, Gonzalo. A Simple Harmonic Universe. Office of Scientific and Technical Information (OSTI), December 2011. http://dx.doi.org/10.2172/1032771.

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Yang, M. J. MR harmonic quad study. Office of Scientific and Technical Information (OSTI), January 1995. http://dx.doi.org/10.2172/15017144.

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Gardner, C. J. Booster Double Harmonic Setup Notes. Office of Scientific and Technical Information (OSTI), February 2015. http://dx.doi.org/10.2172/1172091.

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Niederer, J. BNL MAD: Harmonic Analysis Commands. Office of Scientific and Technical Information (OSTI), November 1996. http://dx.doi.org/10.2172/1151361.

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Michelotti, Leo. Making space for harmonic oscillators. Office of Scientific and Technical Information (OSTI), November 2004. http://dx.doi.org/10.2172/15017029.

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Nguyen, Dinh, Petr Anisimov, and Nicole Neveu. Harmonic Generation, HGHG & EEHG. Office of Scientific and Technical Information (OSTI), February 2021. http://dx.doi.org/10.2172/1765841.

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