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Journal articles on the topic 'Rotor oscillation'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Panchenko, Anatolii, Angela Voloshina, Irina Milaeva, Igor Panchenko, Olena Titova, and . "The Influence of the form Error after Rotor Manufacturing on the Output Characteristics of an Orbital Hydraulic Motor." International Journal of Engineering & Technology 7, no. 4.3 (2018): 1. http://dx.doi.org/10.14419/ijet.v7i4.3.19542.

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The technology of rotors manufacturing for orbital hydraulic motors causes a certain form error of the gear surface. This leads to oscillations of the diametrical gap between the rotors. Such oscillations have a negative effect on the change in the output characteristics of the orbital motor. The previous studies on the issue consider the interaction between the rotors of orbital hydraulic machines as a gapless (theoretical) connection. The authors do not take into account that between the rotors of the orbital hydraulic motor, there is no rigid kinematic connection. This allows the internal r

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2

Tomchina, Olga P. "Control of oscillations in two-rotor cyberphysical vibration units with time-varying observer." Cybernetics and Physics, Issue Volume 9, 2020, Number 4 (December 30, 2020): 206–13. http://dx.doi.org/10.35470/2226-4116-2020-9-4-206-213.

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In this paper the control of oscillations in the two-rotor vibration unit is studied. It is assumed that the velocity of the oscillation of the platform cannot be accurately measured. The time-varying observer is proposed to restore it. In order to guarantee stability of the frequency and amplitude of oscillations of the vibrating parts of a two-rotor vibration unit special control algorithms based on speed-gradient methodology. Simulation results confirm stability of the synchronous rotation modes of the unbalanced rotors of the vibration unit.

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3

Tomchina, Olga P. "Control of oscillations in two-rotor cyberphysical vibration units with time-varying observer." Cybernetics and Physics, Issue Volume 9, 2020, Number 4 (December 30, 2020): 206–13. http://dx.doi.org/10.35470/2226-4116-2020-9-4-206-213.

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In this paper the control of oscillations in the two-rotor vibration unit is studied. It is assumed that the velocity of the oscillation of the platform cannot be accurately measured. The time-varying observer is proposed to restore it. In order to guarantee stability of the frequency and amplitude of oscillations of the vibrating parts of a two-rotor vibration unit special control algorithms based on speed-gradient methodology. Simulation results confirm stability of the synchronous rotation modes of the unbalanced rotors of the vibration unit.

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4

Osman, Mohamad, Richard H. J. Willden, and Christopher R. Vogel. "The effects of surge motion on floating horizontal axis tidal turbines." International Marine Energy Journal 3, no. 2 (2020): 45–54. http://dx.doi.org/10.36688/imej.3.45-54.

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Wave induced motions due to actual sea state conditions will impact the performance of floating horizontal axis tidal turbine systems. This paper presents the results from numerical simulations of a 3-bladed horizontal axis tidal turbine oscillating in surge motion in a moving reference frame. The optimum tip-speed ratio, λ = 4.4 and k-ω SST turbulence model were used in the present study. The Navier-Stokes equation was modified by adding an inertial term to the equation and the Dirichlet boundary condition was also modified in order to simulate in the moving reference frame. The surge oscilla

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Yaroshevich, Nikolay P., Тetjana S. Yaroshevych, and Оlexander V. Shovkomud. "SLOW OSCILLATIONS IN DRIVES OF MACHINE ASSEMBLIES." Cybernetics and Physics, Volume 10, 2021, Number 2 (October 1, 2021): 106–10. http://dx.doi.org/10.35470/2226-4116-2021-10-2-106-110.

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Machine assembly with additional degrees of freedom is considered. The method of direct separation of motions was used for research. It was shown that the braking vibration moment occurring by the reason of resonance effects in the driven object can lead to excitation of rotor oscillations of the assembly with a occurrence of slow oscillations of the vibration exciter rotor is demonstrated. frequency lower than the rotation frequency. Slow rotor oscillations represent a transient process to the stationary motion mode, which is established when an additional load torque occurs. Moreover, the ma

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6

Mamontov, Oleksandr. "The vibration method to measure static unbalance of rigid rotors." Ukrainian Metrological Journal, no. 1 (March 28, 2025): 34–40. https://doi.org/10.24027/2306-7039.1.2025.325890.

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A vibration method to measure static unbalance of rigid rotors has been developed. The method is based on measuring the period of free oscillations of a system consisting of a pendulum frame and a rotor. After installing and fixing the rotor on the frame, free oscillations of the system are generated, and the period is measured. The position of the rotor is changed, rotating it around its axis by one hundred and twenty degrees, and the oscillation period is measured again. The previous operation is repeated. The rotor unbalance and unbalance angle are calculated using the formulas. The paper d

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7

Song, Bo, Jiao Shi, Jinbao Wang, Jianhu Shen, and Kun Cai. "Ideal Oscillation of a Hydrogenated Deformable Rotor in a Gigahertz Rotation–Translation Nanoconverter at Low Temperatures." Sensors 20, no. 7 (2020): 1969. http://dx.doi.org/10.3390/s20071969.

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It was discovered that large-amplitude axial oscillation can occur on a rotor with an internally hydrogenated deformable part (HDP) in a rotation–translation nanoconverter. The dynamic outputs of the system were investigated using molecular dynamics simulations. When an input rotational frequency (100 GHz > ω > 20 GHz) was applied at one end of the rotor, the HDP deformed under the centrifugal and van der Waals forces, which simultaneously led to the axial translation of the other end of the rotor. Except at too high an input rotational frequency (e.g., >100 GHz), which led to eccentr

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8

Zhu, Ya Qing, Min Zhong, Feng Ping Pan, Jia Luo, Xi Zhang, and Wei Jian Huang. "Research of the Impact of Turbine Parameters on Low-Frequency Oscillation Based on Simulink." Applied Mechanics and Materials 607 (July 2014): 556–60. http://dx.doi.org/10.4028/www.scientific.net/amm.607.556.

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This paper analyzed the influence of various turbine parameters on the low-frequency oscillation using Simulink, including the oil motive slide valve time constant, the volume time constant, power grid damping factor, power grid power factor, self-balancing rotor coefficient etc. Meanwhile, comparing the influence of the pure speed regulator and power-frequency regulation on low-frequency oscillations, proven that power-frequency regulation will exacerbate the low frequency oscillation.

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9

Chu, Xin Xing, and Feng Lan Wang. "Analysis of Vibration Characteristics of a Cracked Rotor." Applied Mechanics and Materials 620 (August 2014): 296–99. http://dx.doi.org/10.4028/www.scientific.net/amm.620.296.

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This paper studies the Jeffcott cracked rotor based on level set, considering the oil film oscillation effects on crack rotor, building the stiffness matrix of the cracked rotor in the fixed coordinate system and the moving coordinate, deriving the nonlinear differential equations of coupled vibration of a cracked rotor, and analysis of its dynamic characteristic combined with case. Analysis shows that: crack rotor can produce nonlinear vibration in the crack and Oil film oscillation can be coupled bending and torsional vibration of cracked rotor. The analysis results provides practical basis

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10

Xu, Yiyi, Jun Zhao, Shuai Sun, and Pengfei Liu. "Tidal Turbine Apparatus Vibration and Its Effect on Power Production Measurement." Journal of Marine Science and Engineering 10, no. 2 (2022): 172. http://dx.doi.org/10.3390/jmse10020172.

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The effect of vibration and oscillation of an instrumented testing apparatus on horizontal axis tidal turbine rotor energy generation performance was examined and analyzed. Enforcement struts and an accelerometer were installed to measure and record vibration during the test with and without struts. Three rotors with a solidity (i.e., expanded area ratio, EAR) of 0.25, 0.4, and 0.51 were tested to obtain the rotor energy generation performance data. The analysis of the results is focused on the rotor open-water performance, in terms of the drag and power coefficient, respectively. The results

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11

Wu, Weidong, Jiayang Pang, Xuyang Liu, et al. "Effect of Unbalanced Magnetic Pull of Generator Rotor on the Dynamic Characteristics of a Pump—Turbine Rotor System." Water 15, no. 6 (2023): 1120. http://dx.doi.org/10.3390/w15061120.

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In pumped storage units, the rotor-bearing electromagnetic system is under the joint influence of hydraulics, mechanics, and electromagnetics, and the mechanism of unit vibration problems is very complex to investigate. ANSYS software is used to establish a three-dimensional model of a pumped storage power plant’s rotor-bearing electromagnetic system, and the stiffness coefficient of the unbalanced magnetic traction forces is calculated using the Fourier series of the magnetic conductivity of the air gap. This shows that the nonequilibrium magnetic attraction increases non-linearly with increa

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12

Noor Hidayat, Mohammad, Syarifatul Izza, and Ratna Ika Putri. "Analisis Pengaruh Static Synchronous Series Compensator Terhadap Kestabilan Transien Menggunakan Metode Nyquist (Analysis of the Static Synchronous Series Compensator’s Effect on Transient Stability Using the Nyquist Method)." Jurnal Nasional Teknik Elektro dan Teknologi Informasi 9, no. 1 (2020): 79–86. http://dx.doi.org/10.22146/jnteti.v9i1.140.

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Loss of synchronization causes a generator not in steady state condition, causing system instability. In this paper, Nyquist method is used to determine the transient stability of a synchronous generator using the Nyquist curve. The system is unstable if the G(jω) curve is further away from the point -1 + j0, while the gain margin value is below 6 dB and the phase margin has a value below 30°. The response of the system shows that the rotor angle oscillation on the generator is not synchronous, while the power angle experiences irregular transients so that the power angle increases until it ca

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13

Yaroshevich, Nikolay, Volodymyr Gursky, Vitalii Puts, Olha Yaroshevych, and Viktor Martyniuk. "On the dynamics of vibrational capture of rotation of an unbalanced rotor." Vibroengineering PROCEDIA 42 (May 16, 2022): 1–6. http://dx.doi.org/10.21595/vp.2022.22413.

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Stationary (near stationary) rotation modes of an unbalanced rotor with the oscillation frequency of its axis are considered. From the standpoint of I. I. Blekhman vibrational mechanics, explanations of the mechanism of vibrational capture of the rotation of an unbalanced rotor are given. It is demonstrated that the vibration moment arising as a result of oscillations tends to synchronize vibrational and rotational movements. In addition its effect in the stationary mode becomes unambiguous – either braking or accelerating. It is shown that when a stationary rotation mode is established, large

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14

Abidin, Zainal. "Stabilitas Transien pada Saluran Transmisi dengan Static VAR Compensator (SVC) dan PSS (Power System Stabilizer)." JE-Unisla 5, no. 1 (2020): 326. http://dx.doi.org/10.30736/je.v5i1.421.

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In this discussion the modeling of a transmission system consisting of multiple machine. To maintain transient stability and reduce the oscillation of the system SVC and PSS are used. In its operation, the electric power system often experiences short circuit, both permanent and temporary. The short circuit interruption can cause deviations in electric power system variables, such as voltage, frequency, and others. This deviation can affect the stability of the electric power system. Stability in an electric power system is defined as the ability of an electric power system to maintain synchro

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15

Banga-Banga, Tswa-wen Pierre-Patrick, Carl Kriger, and Yohan Darcy Mfoumboulou. "Decentralized Model-Reference Adaptive Control Based Algorithm for Power Systems Inter-Area Oscillation Damping." Energies 15, no. 22 (2022): 8762. http://dx.doi.org/10.3390/en15228762.

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Being the primary cause of inter-area oscillations and due to the fact that they limit the generation’s output, Low-Frequency Electromechanical Oscillations (LFEOs) represent a real threat to power system networks. Mitigating their effects is therefore crucial as it may lead to system collapse if not properly damped. As rotor angle instability is the primary cause of LFEOs, this paper presents a novel Model-Reference Adaptive Control (MRAC) scheme that enhances its stability. The proposed scheme is tested using the Single-Machine Infinite Bus (SMIB) network. The results obtained validate the p

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16

Filimonikhin, Gennadiy, Volodymyr Yatsun, Anatolii Matsui, Lubov Olijnichenko, and Viktor Pukalov. "Determining experimentally the patterns of the manifestation of the Sommerfeld effect in a ball auto-balancer." Eastern-European Journal of Enterprise Technologies 5, no. 7 (119) (2022): 96–104. http://dx.doi.org/10.15587/1729-4061.2022.265578.

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This paper proposes an experimental method for studying the Sommerfeld effect in auto-balancers or exciters of resonant vibrations of pendulum, ball, or roller type. The method is based on the processing of signals acquired from analog sensors of rotations and vibration acceleration using regression analysis. The method is tested on a specially designed rotor bench on isotropic viscoelastic supports, which executes spatial motion, and an auto-balancer with one ball. Checking the accuracy of the method using stroboscopic lighting demonstrates the accuracy of determining the speed of rotation of

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17

Gennadiy, Filimonikhin, Yatsun Volodymyr, Matsui Anatolii, Olijnichenko Lubov, and Pukalov Viktor. "Determining experimentally the patterns of the manifestation of the Sommerfeld effect in a ball auto-balancer." Eastern-European Journal of Enterprise Technologies 5, no. 7(119) (2022): 96–104. https://doi.org/10.15587/1729-4061.2022.265578.

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This paper proposes an experimental method for studying the Sommerfeld effect in auto-balancers or exciters of resonant vibrations of pendulum, ball, or roller type. The method is based on the processing of signals acquired from analog sensors of rotations and vibration acceleration using regression analysis. The method is tested on a specially designed rotor bench on isotropic viscoelastic supports, which executes spatial motion, and an auto-balancer with one ball. Checking the accuracy of the method using stroboscopic lighting demonstrates the accuracy of determining the speed of rotation of

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18

Бадун, О. П., та Я. Н. Иванов. "ПЛАВАЮЧЕ КІЛЬЦЕ ЯК ДЖЕРЕЛО ЗГИНАЛЬНИХ КОЛИВАНЬ РОТОРА". Aerospace Technic and Technology, № 7 (7 липня 2017): 84–89. http://dx.doi.org/10.32620/aktt.2017.7.12.

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The most usual type of seal round impeller’s collars for LPE TP is a floating ring. The article describes that on certain conditions the floating ring may be a source of bending oscillation occurrence in rotor and stipulates the importance of the rotor dynamics examination within the system “seal-rotor-bearing”. At the same time authors propose a mechanism of the bending oscillation occurrence, show the results of the floating rings testing with various designs and their influence on the ball bearings status, as well as show the results of the rotor development supported by two ball bearings w

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19

Chen, Jiajia, Fanfu Yin, Xinkai Li, et al. "Unsteady aerodynamic modelling for dual-rotor wind turbines with lifting surface method and free wake model." Journal of Physics: Conference Series 2265, no. 4 (2022): 042055. http://dx.doi.org/10.1088/1742-6596/2265/4/042055.

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Abstract A time-marching aerodynamic model for dual-rotor wind turbines (DRWT) is presented with the lifting surface method and free wake model. The performance of a reference DRWT by two axial connected NREL 5MW wind turbines is calculated to verify the algorithm. The output converges with remarkable oscillation. Free wakes swell under the coupling effect. The accumulated power of DRWT outranges single-rotor wind turbine (SRWT) by a limited extent under certain operating conditions. The front rotor (FR) produces the major portion of the power, especially for low inflow velocity. The unsteadin

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20

Chen, Yuzhe, Feng Wu, Linjun Shi, Yang Li, Xu Guo, and Peng Qi. "Analysis and Suppression of Oscillations in Doubly Fed Variable Speed Pumped Storage Hydropower Plants Considering the Water Conveyance System." Sustainability 16, no. 19 (2024): 8715. http://dx.doi.org/10.3390/su16198715.

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The doubly fed variable speed pumped storage (DFVSPS) system is a hydraulically, mechanically, and electrically coupled system, and the characteristics of the components from the water conveyance system to the transmission line need to be fully considered in the oscillation analysis. Hence, the model of the water conveyance system is included to investigate the oscillation characteristics of the DFVSPS connecting to the grid via a series-compensated line. A small-signal state-space model of the DFVSPS system in the generation mode is first established. The oscillation characteristics of the DF

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21

Khrutskaya, M. V. "Technological Aspects of Improving the Power Gyroscope Performance Characteristics of Space Vehicles for Remote Earth Sensing Systems." Herald of the Bauman Moscow State Technical University. Series Mechanical Engineering, no. 3 (142) (September 2022): 71–83. http://dx.doi.org/10.18698/0236-3941-2022-3-71-83.

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The article considers the problems of controlling the preliminary axial load on the ball-bearing support of a power gyroscope rotor by the frequency method. The study of the effect of the power gyroscope rotor rotation speed on the natural oscillation frequency under varying environmental conditions was performed on a special installation that combines a thermal, vacuum chambers and vibration installation using statistical methods for identifying and optimizing complex systems. The relationship between the natural frequency of the rotor forced oscillations and the speed of rotation, ambient te

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22

Dellacasagrande, Matteo, Edward Canepa, Andrea Cattanei, and Mehrdad Moradi. "Characterization of Unsteady Leakage Flow in an Axial Fan." International Journal of Turbomachinery, Propulsion and Power 8, no. 3 (2023): 34. http://dx.doi.org/10.3390/ijtpp8030034.

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The present work reports an experimental study of the leakage flow in a low-speed fan ring. Existing 2D Particle Image Velocimetry (PIV) measurements taken in a meridional plane in front of the rotor gap have been further processed and analyzed by means of the Proper Orthogonal Decomposition (POD). Three values of the dimensionless pressure rise across the rotor have been investigated. Namely, attention has been focused on the intermediate case—the one for which a strong radial oscillation in the leakage flow has been observed: POD results have shown that, in this condition, the leakage flow e

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23

Toylbay, Ozgerishan, Gulzhan Seifulla, Aidos Moldabekov, Dastan Yergaliyev, and Uljalgas Adilbayeva. "THE EFFECT OF SURFACE ROUGHNESS AND ELECTROSTATIC BONDS OF RESIDUAL GASES ON THE SETTLING OF THE GYROSCOPE ROTOR." Вестник КазАТК 132, no. 3 (2024): 110–19. http://dx.doi.org/10.52167/1609-1817-2024-132-3-110-119.

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Consider the rotor of an electrostatic gyroscope (ESG) for contactless operation. The rotors of the ESG are made in the shape of a ball and placed in an electric field. The gyroscope operates contactless between the rotor and the mutual oscillation force of the electrodes. Air is sucked out of the chamber in which the rotor is located. Due to the lack of air resistance and the lack of friction force, the rotor can rotate for a long time. But the rotor, located inside the vacuum, also slows down. The reason for this is the roughness and residual deposits of the rotor surface. This is the notori

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24

Goktas, Taner, and Müslüm Arkan. "Discerning broken rotor bar failure from low-frequency load torque oscillation in DTC induction motor drives." Transactions of the Institute of Measurement and Control 40, no. 1 (2016): 279–86. http://dx.doi.org/10.1177/0142331216654964.

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This paper proposes a method for separation of broken rotor bar failures from low-frequency load torque oscillation in direct torque control (DTC) induction motor drives by using vq voltage and iq current components’ spectra. The effect of load torque oscillation should be considered in induction motor drives for reliable broken bar fault detection. Induction machine drivers are run in DTC mode to control its torque and speed. In practice, the presence of load torque fluctuation may sometimes cause false positive alarms on stator current spectrum. However, discerning of broken rotor bar failur

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25

Ryzhikov, I. N., O. V. Repetskiy, and Van Vinh Nguyen. "Numerical analysis of dynamics and durability of rotor elements in gas turbine engines." iPolytech Journal 26, no. 2 (2022): 173–83. http://dx.doi.org/10.21285/1814-3520-2022-2-173-183.

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In this work, an accurate algorithm for calculating the durability of rotor wheels in gas turbine engines undergoing detuning of parameters was developed. The finite element method, underlying the Ansys Software, was used for modelling free and forced oscillations of rotor wheels. During the experiments, the detuning was simulated by attaching additional masses to the wheel blades. The calculations of frequencies, modes of forced oscillations, as well as dynamic stresses arising due to these oscillations, were carried out using the Fourier series. The schematisation of dynamic stresses, i.e. d

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26

Saeed, Nasser A., Mohamed S. Mohamed, Sayed K. Elagan, and Jan Awrejcewicz. "Integral Resonant Controller to Suppress the Nonlinear Oscillations of a Two-Degree-of-Freedom Rotor Active Magnetic Bearing System." Processes 10, no. 2 (2022): 271. http://dx.doi.org/10.3390/pr10020271.

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Within this article, the nonlinear vibration control of the rotor active magnetic bearings system is tackled utilizing the integral resonant controller for the first time. Two integral resonant controllers are proposed to mitigate the system lateral oscillations in the horizontal and vertical directions. Based on the suggested control technique, the whole system dynamical model is derived as a two-degree-of-freedom nonlinear system (i.e., rotor system) coupled linearly to two first-order filters (i.e., the integral resonant controllers). The nonlinear autonomous system that governs the oscilla

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27

Yan, Li Wei, and Xiao Jie Wang. "Control and Simulation Research on Interactive Oscillation of Operating Power of Diesel Generator Sets in Parallel." Advanced Materials Research 490-495 (March 2012): 2066–70. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.2066.

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For some old diesel generator sets, interactive power oscillation often occurs in the parallel operation, owing to interference of oil supply. Through the analysis on the generator rotor equation, the paper first determines the cause of power change, and then uses control methods to eliminate the power interact oscillations based on actual conditions, and finally uses Matlab simulation to verify effectiveness of control methods

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28

Xie, Zhen, and Xue Li. "The Virtual Resistance Control Strategy for HVRT of Doubly Fed Induction Wind Generators Based on Particle Swarm Optimization." Mathematical Problems in Engineering 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/350367.

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Grid voltage swell will cause transient DC flux component in the doubly fed induction generator (DFIG) stator windings, creating serious stator and rotor current and torque oscillation, which is more serious than influence of the voltage dip. It is found that virtual resistance manages effectively to suppress rotor current and torque oscillation, avoid the operation of crowbar circuit, and enhance its high voltage ride through technology capability. In order to acquire the best virtual resistance value, the excellent particle library (EPL) of dynamic particle swarm optimization (PSO) algorithm

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29

Habbi, Hanan Mikhael, and Ahmed Alhamadani. "Power System Stabilizer PSS4B Model for Iraqi National Grid using PSS/E Software." Journal of Engineering 24, no. 5 (2018): 29. http://dx.doi.org/10.31026/j.eng.2018.05.03.

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To damp the low-frequency oscillations which occurred due to the disturbances in the electrical power system, the generators are equipped with Power System Stabilizer (PSS) that provide supplementary feedback stabilizing signals. The low-frequency oscillations in power system are classified as local mode oscillations, intra-area mode oscillation, and interarea mode oscillations. Double input multiband Power system stabilizers (PSSs) were used to damp out low-frequency oscillations in power system. Among dual-input PSSs, PSS4B offers superior transient performance. Power system simulator for en

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30

Wang, Qing, and Qijun Zhao. "Unsteady Aerodynamic Characteristics Simulations of Rotor Airfoil under Oscillating Freestream Velocity." Applied Sciences 10, no. 5 (2020): 1822. http://dx.doi.org/10.3390/app10051822.

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The dynamic stall characteristics of rotor airfoil are researched by employing unsteady Reynolds-Averaged Navier-Stokes (RANS) method under oscillating freestream velocity conditions. In order to simulate the oscillating freestream velocity of airfoil under dynamic stall conditions, the moving-embedded grid method is employed to simulate the oscillating velocity. By comparing the simulated dynamic stall characteristics of two-dimensional airfoil and three-dimensional rotor, it is indicated that the dynamic stall characteristics of airfoil under oscillating freestream velocity reflect the actua

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31

Anton, E., and H. Ulbrich. "Active Control of Vibrations in the Case of Asymmetrical High-Speed Rotors by Using Magnetic Bearings." Journal of Vibration and Acoustics 107, no. 4 (1985): 410–15. http://dx.doi.org/10.1115/1.3269281.

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Rotor-bearing systems with long, fast running rotors and rotational symmetry disturbed in stiffness, damping and moments of inertia are investigated. Since a magnetic bearing is used as an actuator in a control circuit, vibrations of the system can be influenced in a desired way, A feedback control is designed with emphasis to the endangered modes of oscillation of the rotor system caused by parametrical excitation. A small number of sensors and a controller with constant gain factors are used in order to obtain a low-cost system. For illustration an elastically supported gas centrifuge with 1

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32

Manzoor, Aaqib, Mairaj ud Din Mufti, and Mohammad Younis Nabi. "Java script animation of generator rotors under different modes of oscillation in two area four machine system." IOP Conference Series: Materials Science and Engineering 1228, no. 1 (2022): 012033. http://dx.doi.org/10.1088/1757-899x/1228/1/012033.

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Abstract Computer technology advancements aid in the creation of instructional plans that allow students to study in a variety of ways. Animations and digital maps make it easier to understand abstract concepts and ensure that learning is permanent. Animation is a technique of creating continuous motion and shape change illusion. Interconnected power system often seems to be an intractably intricate morass of equations and ad hoc rules of thumb. Lack in visibility impedes learning about the power system phenomena. Animation can help us to convey information that would otherwise require a thous

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33

Lizunov, P. P., A. A. Grom, and I. N. Levchenko. "Rotor oscillation and stability in complex motion." International Applied Mechanics 35, no. 7 (1999): 741–44. http://dx.doi.org/10.1007/bf02682212.

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34

Koval'chuk, P. S., and G. N. Puchka. "Biharmonic oscillation of a flexible unbalanced rotor." International Applied Mechanics 30, no. 1 (1994): 58–64. http://dx.doi.org/10.1007/bf00847157.

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35

Volodymyr, Yatsun, Filimonikhin Gennadiy, Haleeva Antonina, et al. "SEARCHING FOR THE TWOFREQUENCY MOTION MODES OF A THREEMASS VIBRATORY MACHINE WITH A VIBRATION EXCITER IN THE FORM OF A PASSIVE AUTOBALANCER." Eastern-European Journal of Enterprise Technologies 4, no. 7 (106) (2020): 103–11. https://doi.org/10.15587/1729-4061.2020.209269.

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The dynamics of a three-mass vibratory machine with the rectilinear translational motion of platforms and a vibration exciter in the form of a ball, roller, or pendulum auto-balancer have been analytically investigated. The existence of steady state motion modes of a vibratory machine that are close to two-frequency regimes has been established. At these motions, the loads in an auto-balancer create constant imbalance, cannot catch up with the rotor, and get stuck at a certain frequency. These loads work as the first vibration exciter, thereby exciting vibrations in resonance with the frequenc

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Akinin, K. P., V. G. Kireyev, I. S. Petukhov, A. A. Filomenko, V. A. Lavrinenko, and E. M. Mikhailik. "STUDY OF THE INFLUENCE OF CHANGING THE PARAMETERS OF BRUSHLESS MAGNETOELECTRIC MOTORS OF THE RETURN-ROTARY MOTION ON THEIR CHARACTERISTICS." Praci Institutu elektrodinamiki Nacionalanoi akademii nauk Ukraini 2022, no. 62 (2022): 25–33. http://dx.doi.org/10.15407/publishing2022.62.025.

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The paper presents the results of studies on the influence of changing the parameters of a specialized brushless magne-toelectric motor on its characteristics in the mode of return-rotary motion. The frequency dependencies of the amplitude of the rotor oscillation angle, the effective value of the stator current, the efficiency index of the motor operation mode, the amplitude of the angular speed of the rotor oscillations, the amplitude of the stator voltage, the total value of losses in the motor are given. The dependences of the resonant frequency of mechanical oscillations on the changing v

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Deng, Hao, Cunyun Pan, Xiaojun Xu, and Xiang Zhang. "A twin-rotor piston engine with annular connecting chambers." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 5 (2012): 1080–89. http://dx.doi.org/10.1177/0954406212455758.

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An effort in progress to develop a new twin-rotor piston engine is described. A proposition of sealing, which benefits from the conventional piston-cylinder structure is presented. A six-stroke twin-rotor piston engine, which is designed to have coolant intake and drain stroke is proposed. A differential velocity drive mechanism, which controls the rotors’ oscillation, is invented. The differential velocity drive mechanism utilizes novel kinematic design to completely eliminate inertial loads. The twin-rotor engine is expected to have three key technical advantages for attaining higher power d

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HACKBORN, W. W., M. E. ULUCAKLI, and T. YUSTER. "A theoretical and experimental study of hyperbolic and degenerate mixing regions in a chaotic Stokes flow." Journal of Fluid Mechanics 346 (September 10, 1997): 23–48. http://dx.doi.org/10.1017/s0022112097005910.

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We examine the rotor–oscillator flow, a slow viscous flow between long parallel plates driven by the rotation of a slender cylinder (the rotor) and the longitudinal oscillation of one of the plates (the oscillator). For rotor locations of interest to us, this flow exhibits a hyperbolic mixing region, characterized by homoclinic tangling associated with a hyperbolic fixed point, and a degenerate mixing region, characterized by heteroclinic tangling associated with two degenerate fixed points on one of the boundary plates (normally the oscillator). These mixing regions are investigated both theo

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Deng, Hao, Cun Yun Pan, and Xiao Cong Wang. "Non-Uniform Motion Mechanisms Utilized in a Twin-Rotor Piston Engine." Applied Mechanics and Materials 184-185 (June 2012): 320–23. http://dx.doi.org/10.4028/www.scientific.net/amm.184-185.320.

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Non-uniform motion mechanisms (NUMM) utilized in a Twin-rotor piston engine (TRPE) are introduced. TRPE mechanism consists of two major components. One is energy conversion system (ECS), and the other is differential velocity drive mechanism (DVDM). DVDM is composed of NUMMs and ordinary gear train in this paper. NUMMs generate two non-uniform rotations with same pattern and different pace. Gear train duplicates the two rotations and causes the two rotors rotating with periodical oscillation.

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Dai, Kun Tian, Ying An, Zhi Wei Jiao, et al. "Study on Carbon Nanotube Dispersion Behavior in Epoxy Resin under Synergistic Effect of Continuous Stretching Flow and Ultrasound Oscillation." Key Engineering Materials 717 (November 2016): 14–21. http://dx.doi.org/10.4028/www.scientific.net/kem.717.14.

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In this paper, carbon nanotubes (CNTs) dispersion behavior in epoxy resin under synergistic effect of continuous stretching flow and ultrasound oscillation was studied. A small continuous stretching machine which could provide continuous stretching flow for polymer was designed and manufactured for studying the synergistic effect of continuous stretching flow and ultrasound oscillation on dispersive property. Firstly, the influence of different initial phase angle of dual rotor and mixing time on dispersive property were studied by preparing specimens of CNTs/epoxy resin composite under contin

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Lus’, V. "REGARDING THE QUALITY OF ASSEMBLY OF THE SCREW CONNECTIONS OF THE MOUNTING ASSEMBLY OF BALL BEARINGS." Municipal economy of cities 3, no. 163 (2021): 12–15. http://dx.doi.org/10.33042/2522-1809-2021-3-163-12-15.

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Application of method of vibrodiagnostics is based on the presence of cross-correlation dependences of dynamic descriptions of all knots from contact pressure in connection through the change of inflexibility of joints. The change of inflexibility of separate elements causes the change of the resulted inflexibility of knot, and at the same time and characteristic it to dynamic descriptions of the artificially created oscillation field: frequencies and amplitudes of resonance vibrations, indexes of damping, phase correlations. There is a task of determination of method of control of the most re

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Irwanto, M., Norfadilah, N. Gomesh, M. Irwan, and M. R. Mamat. "Improvement of Dynamic Electrical Power System Stability Using Riccati Matrix Method." Applied Mechanics and Materials 793 (September 2015): 29–33. http://dx.doi.org/10.4028/www.scientific.net/amm.793.29.

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Power system stability means the ability to develop restoring forces equal to or greater than the disturbing forces to maintain the state of equilibrium. Successful operation of a power system depends largely on providing reliable and uninterrupted service to the loads by the power utility. The stability of the power system is concerned with the behavior of the synchronous machines after they have been disturbed. If the disturbance does not involve any net change in power, the machines should return to their original state. Due to small disturbances, power system experience these poorly damped

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Filipkovskij, Sergey, and Sergey Chaikin. "Experimental study of nonlinear vibration characteristics of a two-rotor turbofan engine system with an intershaft support." Aerospace Technic and Technology, no. 4sup2 (August 29, 2024): 60–68. http://dx.doi.org/10.32620/aktt.2024.4sup2.08.

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The layout of the turbofan engine with coaxial rotors and intershaft rear support of the high-pressure rotor is the most compact one since the rear supports of both rotors are located in one oil cavity, provided with a joint system of communications for oil supply and suction, and the force diagram of the aircraft engine stator is simplified. The disadvantage of this layout is the mutual influence of high-pressure (HP) and low-pressure (LP) rotors through the intershaft support, which leads to significant vibration activity due to the operating conditions of the intershaft bearing. The purpose

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M. Gajare, Atul, Dr R. P. Singh, and Dr M. U. Nemade. "Power System Stability Analysis of SMIB with FOPID using Cuckoo Search Optimized Differential Evaluation." International Journal of Engineering & Technology 7, no. 2.17 (2018): 5. http://dx.doi.org/10.14419/ijet.v7i2.17.11551.

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Due to complexity in the power system there is always a loss of the stability due to the fault. Whenever a fault is intercepted in system, the whole system goes to severe transients. These transients cause oscillation in phase angle which leads poor power quality. The nature of oscillation is increasing instead being sustained, which leads system failure in form of generator damage. To reduce and eliminate the unstable oscillations one needs to use a stabilizer which can generate a perfect compensatory signal in order to minimize the harmonics generated due to instability.This paper presents a

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Lampart, Marek, and Jaroslav Zapoměl. "Vibrations attenuation of a system excited by unbalance and the ground movement by an impact element." Applied Mathematics and Nonlinear Sciences 1, no. 2 (2016): 603–16. http://dx.doi.org/10.21042/amns.2016.2.00046.

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AbstractThis paper concentrates on the vibrations attenuation of a rotor driven by a DC motor and its frame flexibly coupled with a baseplate by linear cylindrical helical springs and damped by an element that can work either in inertia or impact regime. The system oscillation is governed by three mutually coupled second-order ordinary differential equations. The nonlinear behaviour occurs if the impact regime is adjusted. The damping element operating in inertia mode reduces efficiently the oscillations amplitude only in a narrow frequency interval. In contrast, the damping device working in

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Ryspek, Usubamatov. "Gyroscope oscillation depends on a rotor speed velocity." International Journal of Physics Research and Applications 6, no. 1 (2023): 068–72. http://dx.doi.org/10.29328/journal.ijpra.1001053.

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In engineering, all moving rotating objects exhibit gyroscopic effects resulting from the action of an external torque on a rotating object. Gyroscopic effects are the action of a set of inertial moments and movements of an object around three axes of a three-dimensional Cartesian coordinate system. Moments of inertia are created by centrifugal and Coriolis forces, as well as the moment of change in angular momentum, which is expressed by their kinetic energy. The values of the moments of inertia directly depend on the speed of rotation of the object and its rotation around the axes. A short-t

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Yang, Bo, Guanjun Li, Wencheng Tang, Anping Hu, Donghui Zhang, and Yongbin Wu. "Energy Storage System Controller Design for Suppressing Electromechanical Oscillation of Power Systems." Applied Sciences 9, no. 7 (2019): 1329. http://dx.doi.org/10.3390/app9071329.

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Through the feedback of the rotor speed and/or the grid frequency, an energy storage system (ESS) can effectively suppress the electromechanical oscillation of a power system. This paper proposes a novel control strategy and controller parameter design method for ESSs to achieve the desired performance of oscillation suppression, including smaller frequency and rate of change of frequency (ROCOF) deviation than their threshold values. Firstly, a dynamic model of the electromechanical time scale of a synchronous generator dominated power system with ESS was established. Then, based on the dynam

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Zhang, Xu Guang, and Zhen Xie. "Research on Flux Damping Control Strategy of DFIG during Grid Voltage Dips." Applied Mechanics and Materials 713-715 (January 2015): 756–59. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.756.

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A flux damping control strategy was proposed to accelerate the decay of stator flux and restrain stator, rotor current and torque oscillation caused by grid voltage dips. Firstly, this paper analyzes the simplified mathematical model of DFIG during symmetrical voltage dips. Then, the mechanism of flux damping control strategy to restrain stator, rotor current oscillation and increase flux damping was analyzed. The flux damping control strategy can increase the damping of stator side, which accelerates the decay of the stator flux natural component and improve the dynamic LVRT performance of DF

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Strazisar, A. J. "Investigation of Flow Phenomena in a Transonic Fan Rotor Using Laser Anemometry." Journal of Engineering for Gas Turbines and Power 107, no. 2 (1985): 427–35. http://dx.doi.org/10.1115/1.3239743.

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Several flow phenomena, including flow field periodicity, rotor shock oscillation, and rotor shock system geometry have been investigated in a transonic low aspect ratio fan rotor using laser anemometry. Flow periodicity is found to increase with increasing rotor pressure rise and to correlate with blade geometry variations. Analysis of time-accurate laser anemometer data indicates that the rotor shock oscillates about its mean location with an amplitude of 3–4 percent of rotor chord. The shock surface is nearly two-dimensional for levels of rotor pressure rise at and above the peak efficiency

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Usubamatov, Ryspek. "Fundamental properties of the gyroscope oscillation." Journal of AppliedMath 2, no. 3 (2024): 532. http://dx.doi.org/10.59400/jam.v2i3.532.

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Despite partial solutions by famous scientists during the early Industrial Revolution, gyroscope problems remained unsolvable until the beginning of the twentieth century, when several fundamental physical laws were finally formulated to describe them. Today, the principles of classical mechanics enable the formulation and description of the physical processes involved in the rotation of any object. Gyroscopic devices are objects that rotate and exhibit oscillation, which has been a challenging problem in engineering mechanics. The oscillation of a gyroscope is caused by the interaction betwee

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