Relevant bibliographies by topics / Rotor oscillation

Contents

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

Academic literature on the topic 'Rotor oscillation'

Author: Grafiati
Published: 28 May 2022
Last updated: 31 July 2025

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Journal articles on the topic "Rotor oscillation"

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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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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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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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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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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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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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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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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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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Dissertations / Theses on the topic "Rotor oscillation"

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Wu, Long. "Separating Load Torque Oscillation and Rotor Faults in Stator Current Based-Induction Motor Condition Monitoring." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14545.

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Stator current spectral analysis techniques are usually used to detect rotor faults in induction machines. Magnetic field anomalies in the airgap due to the rotor faults result in characteristic side-band harmonic components in the stator current spectrum, which can be measured as rotor fault signatures. A position-varying load torque oscillation at multiples of the rotational speed, however, has exactly the same effect. Stator current harmonics due to a load torque oscillation often obscure and even overwhelm rotor eccentricity fault detection since the magnitude of load oscillation induce
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Маренич, М. М. "Розробка та дослідження конструкції ротаційного компресора з ротором що котиться. Моделювання коливань ротора". Master's thesis, Сумський державний університет, 2018. http://essuir.sumdu.edu.ua/handle/123456789/72120.

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У дослідній частині поставлені задачі виконати дослідження та проектування резонансних частот коливань ротаційного компресора з ротором що котиться. У конструкторській частині виконано міцнісний розрахунок вала компресора, конструктивні розрахунки підшипників, муфти, ущільнень, клапанів. Визначення основних геометричних розмірів проектованого компресора. Конструктивний розрахунок конденсатора повітряного охолодження. В розділі охорони праці проведено аналіз небезпечних та шкідливих виробничих факторів при роботі ротаційного компресора з ротором що котиться, виконано розрахунок занулення електр
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稲垣, 瑞穂, Mizuho INAGAKI, 幸男 石田 та ін. "クリアランス内で衝突を伴うロータの非線形強制振動と自励振動 (1/2次分数調波共振付近の引込現象と結合振動)". 日本機械学会, 2003. http://hdl.handle.net/2237/9044.

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稲垣, 瑞穂, Mizuho INAGAKI, 幸男 石田, Yukio ISHIDA, 晃正 林 та Akimasa HAYASHI. "クリアランス内で衝突を伴うロータの非線形強制振動と自励振動 (非線形ばね・減衰モデルによる分数調波振動の解析)". 日本機械学会, 2005. http://hdl.handle.net/2237/9040.

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Iacobucci, Alessandra. "Nonequilibrium stationary states of rotor and oscillator chains." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLED040/document.

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Nous étudions les propriétés des états stationnaires et de dynamiques hors-équilibre, d’un point de vue théorique et numérique. Ces dynamiques sont obtenues en perturbant la dynamique d’équilibre par forçage mécanique et/ou thermique. Dans l’approche théorique, le système considéré évolue selon une dynamique de Langevin à laquelle on ajoute une force extérieure. Nous étudions la convergence de la loi de la dynamique vers la mesure stationnaire, en donnant des estimations quantitatives du taux, dans les régimes Hamiltonien et sur amorties. Dans l’approche numérique, nous considérons une chaîne
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Fay, Sarah (Sarah C. ). "The rotor-oscillator flow : searching for coherence amidst chaos." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98955.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 29).<br>Chaotic mixing of highly viscous fluids is common in many biological and industrial processes. This study aims to gain insight about the properties of such common processes by examining one particular case of viscous, chaotic mixing: the rotor-oscillator flow. For some couplings of the rotor motion with its oscillation, this flow has been shown to have coherent islands of fluid parcels surrounded by a sea
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Alahmad, Bashar. "The role of location of low inertia in power systems." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-444863.

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The plans to reduce the energy-related greenhouse gas emissions stimulate the deployment of electronically interfaced renewable resources. The increased penetration of such intermittent sources together with phasing conventional power plants out and the installation of High Voltage Direct Current (HVDC) links for long-distance more efficient transmission, reduces the stored inertia in any electrical grid. This leads to a more vulnerable power system and increases the significance of studying the corresponding stability aspects. Decreasing the inertial response of a power system deteriorates th
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Sahalaeva, S. A. "The investigatin of angular oscillations of the centrifugal pump rotor in annular seals." Thesis, Видавництво СумДУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/25888.

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Levchenko, K. V. "The investigation of radial oscillations of the centrifugal pump rotor in annular seals." Thesis, Сумський державний університет, 2013. http://essuir.sumdu.edu.ua/handle/123456789/33694.

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The centrifugal pumps and compressors have obtained a widespread application in industry. To a considerable degree, their technical development is defined by vibroacoustic parameters that depend on the vibrational state of the rotor. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/33694
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Levchenko, K. "The investigation of radial oscillations of the centrifugal pump rotor in annular seals." Thesis, Видавництво СумДУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/25860.

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Books on the topic "Rotor oscillation"

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Center, Ames Research, ed. Dynamic analysis of rotor blade undergoing rotor power shutdown. National Aeronautics and Space Administration, Ames Research Center, 1990.

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Center, Ames Research, ed. Dynamic analysis of rotor blade undergoing rotor power shutdown. National Aeronautics and Space Administration, Ames Research Center, 1990.

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Kushul’, Mikhail Yakovlevich. The Self-Induced Oscillations of Rotors / Avtokolebaniya Rotorov / АВТОКОЛЕБАНИЯ РОТОРОВ. Springer US, 1995. http://dx.doi.org/10.1007/978-1-4684-9075-6.

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H, Hamouda M.-Nabil, Yeager William T, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., eds. Wind-tunnel survey of an oscillating flow field for application to model helicopter rotor testing. National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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H, Hamouda M.-Nabil, Yeager William T, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., eds. Wind-tunnel survey of an oscillating flow field for application to model helicopter rotor testing. National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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H, Hamouda M.-Nabil, Yeager William T, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., eds. Wind-tunnel survey of an oscillating flow field for application to model helicopter rotor testing. National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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Mirick, Paul H. Wind-tunnel survey of an oscillating flow field for application to model helicopter rotor testing. Langley Research Center, 1990.

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Hounjet, M. H. L. A method to calculate steady and unsteady potential flow about fixed and rotating lifting and nonlifting bodies. National Aerospace Laboratory, 1985.

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Kushul, Mikhail Y. Self-Induced Oscillations of Rotors. Island Press, 1995.

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Kushul, Mikhail Y. The Self-Induced Oscillations of Rotors. Springer, 1997.

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Book chapters on the topic "Rotor oscillation"

1

Kydyrbekuly, A. "Rotor-Liquid-Fundament System’s Oscillation." In Advances in Mechanisms Design. Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5125-5_30.

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Zapoměl, Jaroslav, Petr Ferfecki, Jan Kozánek, and Leonid Savin. "Controllable magnetically sensitive rotor support element for reducing oscillation and force transmission." In Advances in Mechanism and Machine Science. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20131-9_334.

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Gaponenko, S. O., A. E. Kondratiev, and I. R. Tazeev. "Assessment of Natural Oscillation Frequencies of Rotor for Development of Hard-Bearing Balancing Machine." In Lecture Notes in Mechanical Engineering. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22041-9_29.

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Zhang, Xunzhe, Jing Zhao, Jihao Yu, Honggang Zhong, and Qijie Zhai. "The Effect of Surface Pulsed Magneto-Oscillation on Solidification of Low Pressure Rotor 30Cr2Ni4MoV Steel." In TMS2015 Supplemental Proceedings. John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093466.ch13.

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Zhang, Xunzhe, Jing Zhao, Jihao Yu, Honggang Zhong, and Qijie Zhai. "The Effect of Surface Pulsed Magneto-Oscillation on Solidification of Low Pressure Rotor 30Cr2Ni4MoV Steel." In TMS 2015 144th Annual Meeting & Exhibition. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48127-2_13.

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Kolodyazhnaya, Lyubov, Yuriy Bykov, and Romuald Rza̧dkowski. "Aeroelastic State of Turbine Rotor During Harmonic Blade Oscillations." In Lecture Notes in Mechanical Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-82979-6_2.

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Boyaci, Aydin, and Bernhard Schweizer. "Nonlinear Oscillations of High-Speed Rotor Systems in Semi-Floating Ring Bearings." In Proceedings of the 9th IFToMM International Conference on Rotor Dynamics. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_69.

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Simonovskiy, Vitalii, Ivan Pavlenko, Jan Pitel, Denys Stremoukhov, and Vitalii Ivanov. "Methods and Algorithms for Calculating Nonlinear Oscillations of Rotor Systems." In Lecture Notes in Mechanical Engineering. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77823-1_7.

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Van De Vrande, B. L., and D. H. Van Campen. "Nonlinear Dynamics of a Rigid Rotor on Compliant Journal Bearings." In IUTAM Symposium on Recent Developments in Non-linear Oscillations of Mechanical Systems. Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4150-5_30.

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Spickermann, Christian. "Assessment of the Rigid Rotor Harmonic Oscillator Model at Increased Densities." In Entropies of Condensed Phases and Complex Systems. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-15736-3_3.

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Conference papers on the topic "Rotor oscillation"

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Masarati, Pierangelo, Georges Tod, Marilena Pavel, Vincenzo Muscarello, Giuseppe Quaranta, and François Malburet. "Adverse Aeroelastic Roll/Lateral Rotorcraft-Pilot Couplings Analysis." In Vertical Flight Society 72nd Annual Forum & Technology Display. The Vertical Flight Society, 2016. http://dx.doi.org/10.4050/f-0072-2016-11442.

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The paper investigates the basic mechanism of aeroservoelastic Pilot Assisted Oscillation phenomenon (PAO) about the roll axis due to the interaction with the pilot's arm biomechanics. The motivation stems from the observation that a rotor imbalance may occur as a consequence of rotor cyclic lead-lag modes excitation. The instability mechanism is analogous to the 'air resonance' phenomenon, in which the pilot's involuntary action plays the role of the AFCS. Using robust stability analysis, the paper demonstrates that, in particular, the introduction of a gain and a time-delay between the stick
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Hasegawa, Yutaka, Yusuke Takagi, Junsuke Murata, and Koji Kikuyama. "Flapwise and Edgewise Blade Loads Analysis of HAWT Rotor by Using Fluid-Oscillation Coupled Calculation Model." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-07001.

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A horizontal axis wind turbine suffers fluctuating aerodynamic loads, which result in oscillations of the rotor blades. Since the blade oscillation has considerable effects on the blade fatigue life, the influence on the fatigue loads from the interaction between the aerodynamic loads and the structural oscillations should be considered in the design process of the wind turbine rotor. The objective of this work is to analyze the aerodynamic effects on the fatigue loads of rotor blade due to structural oscillation and inflow conditions, by using numerical calculation method. This paper explains
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He, Tingyi, Shengnan Li, Lei Chen, Kaibin Li, Cheng Guo, and Wei Huang. "Distinction and Conversion Between Frequency Oscillation Mode and Rotor Angle Oscillation Mode." In 2021 IEEE 5th Conference on Energy Internet and Energy System Integration (EI2). IEEE, 2021. http://dx.doi.org/10.1109/ei252483.2021.9713570.

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Peitsch, Dieter, Heinz E. Gallus, and Stefan Weber. "Numerical Investigation of the Unsteady Transonic 3D-Flow in Stator and Rotor Cascades With Oscillating Blades." In ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-307.

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Subject of this paper is a numerical method for the simulation of flutter in three dimensional oscillating cascades. Unsteadiness can be caused by bending and torsional oscillation modes simultaneously. The goal of the investigation is the evaluation of the resulting blade forces and moments. The flow is assumed to be time-dependent and inviscid. By solving the Euler equations in a nonlinear way, large oscillations as well of the airfoil as of existing shocks can be treated. The numerical solution follows a Godunov-type upwind scheme, formulated in node centered finite volume technique. An app
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Chen, Zhiyang, Yanhui Wu, Guowei Yang, Guangyao An, and Bo Wang. "Investigation Into Flow Mechanism Leading to the Step Change in Aerodynamic Modes of Rotating Instabilities in a Subsonic Axial Compressor Rotor." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63286.

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Rotating instability (RI) as a prestall wave is closely related to tip clearance noise, blade vibration and rotating stall/surge of axial compressors, so lots of researchers have focused on it. In this paper, the experimental and numerical investigations for a subsonic compressor are carried out to explore the flow mechanism leading to the step change in aerodynamic modes of rotating instabilities at different rotor speeds. The measurement results show that RIs only appear at operating points in a narrow mass flow range near the stability limit of the test rotor both at a medium and at a high
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Pagwiwoko, Cosmas, and Robert Short. "Numerical Modelling Based on Large-Angle Oscillation Theory in Determining the Rotating Inertia of a Rotor Subjected to Frictions." In ITP Research Symposium 2022. Unitec ePress, 2023. http://dx.doi.org/10.34074/proc.2302017.

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This research discusses a numerical method used for determining the mass moment of inertia of a rotor that has been validated through laboratory tests. In this technique, the rotor is considered as a pendulum where an additional mass is mounted at the outskirt underneath the rotor. The equation of motion of this pendulum is then established, based on the oscillating unbalanced rotor, and the magnitude of the inertia is extracted from the free oscillating response. Nonlinear theory of pendulums with large-angle oscillation is applied to estimate the mass moment of inertia. While this mathematic
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Liang, Feng, Quanyong Xu, and Ming Zhou. "Predicting the Frequency of the Rotor Whirl Excited by Semi-Floating Ring Bearing." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-47062.

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The semi-floating ring bearings (SFRBs) are developed to attenuate rotor vibrations by providing damping, but the subsynchronous oscillations cannot be avoided. The subsynchronous oscillations of the rotor are the self-excited whirl motions for the instability of the oil films. Their frequencies are usually less than the half of the rotor speed, but difficult to be predicted because the effects of SFRB’s parameters on the subsynchronous oscillation frequency are not clear. In this paper, an analytical expression is proposed to estimate the subsynchronous whirl frequency of SFRB. To verify the
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Zhao, Guang, Zhan-sheng Liu, Yong-liang Wang, and Jin-feng Zhang. "Study on Stabilities of Rotor-Bearing Systems With Different Types of Couplings." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59751.

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Nonlinear dynamic model of gear coupling is derived, dynamic equations of rotor-bearing systems connected by rigid coupling, gear coupling and flexible coupling are established based on finite element analysis, stability simulations and experiments are also performed. Simulation and experiment results show coupling type have important influence on stability of rotor-bearing system, instabilities of rotor-bearing systems coupled through rigid coupling and flexible coupling are caused by oil whirl or oscillation. Simulation result indicates instability of rotor-gear coupling-bearing system is in
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Schinnerl, Mario, Wolfgang Beer, and Reinhard Willinger. "Interpretation of Unexpected Aggregation of Condensate in Shrouded HP-Stages of an Industrial Steam Turbine." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26083.

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Unexplainable rotor oscillations occured at an industrial steam turbine with air condenser shortly after startup of the plant, but already at specified load points. These oscillations led to immediate shutdowns and were not explainable with conventional reasons at that time. After several oscillation measurements and analysis a hypothesis was developed to explain the oscillation phenomena: The reason of the oscillations is an aggregation of condensate in a labyrinth seal of one or more turbine stages which acts like additional bearings and shifts the eigenfrequencies of the whole system. This
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10

Zagitov, R. A., N. V. Shuvaev, A. N. Dushko, and Yu N. Shmotin. "Numerical Simulation of Unsteady Flow Around Oscillating Blade." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69458.

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The paper is pointed to the problem of numerical simulation of unsteady flow around an oscillating blade in jet engine compressor. Single compressor rotor blade row is considered. It is assumed that mode shape and frequency of blade oscillation is not influenced by airflow. The system of governing equations is transformed to a moving coordinate system to describe blade oscillations. Multi-block structured “H-O” grid is used for spatial discretization. Inner boundary of “O”-grid (representing blade airfoil surface) is moved to describe blade airfoil oscillation. To minimize discretization error
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