Results 21 to 30 of about 48,016 (315)
High-frequency thermal processes in harmonic crystals [PDF]
Doklady Physics, 2017 We consider two high-frequency thermal processes in uniformly heated harmonic crystals relaxing towards equilibrium: (i) equilibration of kinetic and potential energies and (ii) redistribution of energy among spatial directions. Equation describing these processes with deterministic initial conditions is derived.
Kuzkin, Vitaly A., Krivtsov, Anton M.
openaire +2 more sources
Energy Reports, 2022 Due to the existence of high amount stator current harmonics caused by the inverter nonlinearity, the operation performance of Permanent Magnet Servo System (PMSS) used Proportional–Integral (PI) controller will be affected.
Tianqing Yuan +3 more
doaj +1 more source
The relationship between bubble concentration and the acoustic emission energy of separate frequency bands [PDF]
JASA Express Letters, 2022 This letter presents the relationship between bubble concentration and the energy ratio of low to high frequency bands of their acoustic emissions. Two sensors, placed perpendicular and concentric to a transmitter, captured the emissions from sonicated ...
Krit Sujarittam, James J. Choi
doaj +1 more source
Calculation improvement of no-load stray losses in induction motors with experimental validation [PDF]
Serbian Journal of Electrical Engineering, 2015 On the basis of the known fact that all air gap main flux density variations are enclosed by permeance slot harmonics, only one component of stray losses in rotor (stator) iron is considered in the new classification, instead of 2 components ...
Kostić Miloje M.
doaj +1 more source
Applied Sciences, 2020 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 ...
Guishuo Wang, Xiaoli Wang, Chen Zhao
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Harmonics and Interharmonics Detection Based on Synchrosqueezing Adaptive S-Transform
Energies, 2022 The integration of renewable energy generation and nonlinear power electronic equipment into the grid brings about complex harmonics and interharmonics problems.
Zhaoyu Lou +3 more
doaj +1 more source
, 2022 The waveforms distortion assessment nowadays requires great research efforts due to the contemporaneous presence of low- and high-frequency harmonics and interharmonics (up to 150 kHz). In this paper, a new multi-method approach allowed accurate and fast
Varilone P. +5 more
core +1 more source
Induction Motor Direct Torque Control with Synchronous PWM
Energies, 2021 A novel induction motor direct torque control (DTC) algorithm with synchronous modulation is presented. Compared to the traditional DTC method, whose main drawback is the presence of low-frequency torque harmonics (sub-harmonics), in the proposed method,
Alessandro Benevieri +4 more
doaj +1 more source
High-Frequency Behavior of Residual Current Devices [PDF]
, 2012 The purpose of this paper is to analyze the behavior of residual current devices at frequencies higher than the rated one. Many experiments are carried out by measuring tripping current and time of devices of different typology, produced by different ...
Freschi, Fabio
core +1 more source
IEEE Access, 2023 An improved modulation method is proposed for two parallel three-level interleaved rectifiers to reduce current harmonics and high-frequency zero-sequence circulating current, which uses sinusoidal pulse width modulation.
Yanfeng Li +3 more
doaj +1 more source