Готові списки джерел за темами / Synchronous thermal instability

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Добірка наукової літератури з теми "Synchronous thermal instability"

Автор: Grafiati

Опубліковано: 10 березня 2023

Оновлено: 31 липня 2025

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Статті в журналах з теми "Synchronous thermal instability"

Balbahadur, A. C., and R. G. Kirk. "Part II—Case Studies for a Synchronous Thermal Instability Operating in Overhung Rotors." International Journal of Rotating Machinery 10, no. 6 (2004): 477–87. http://dx.doi.org/10.1155/s1023621x04000478.

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Анотація:

In Part I, a theoretical model was developed for a synchronous thermal instability that is caused by differential viscous shearing in bearings of overhung rotors. This second part used computer programs, which were based on the theoretical model, to examine various case studies that pertain to this thermal instability. Both plain and tilting pad journal bearing rotors were examined and good agreement was found between the theoretical predictions and the practical results.

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Balbahadur, A. C., and R. G. Kirk. "Part I—Theoretical Model for a Synchronous Thermal Instability Operating in Overhung Rotors." International Journal of Rotating Machinery 10, no. 6 (2004): 469–75. http://dx.doi.org/10.1155/s1023621x04000466.

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Анотація:

Atheoretical model has been developed for a synchronous thermal instability that is caused by differential viscous shearing in bearings of overhung rotors. This model employs an unbalance threshold criterion for instability instead of utilizing a traditional frequency-domain stability analysis. The current model will be used to investigate several case studies for both plain and tilting pad journal bearing rotors in the second part of this article.

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Singh, A. Narain, W. Doorsamy, and W. A. Cronje. "Thermal Instability Analysis of a Synchronous Generator Rotor using Direct Mapping." SAIEE Africa Research Journal 109, no. 1 (2018): 4–14. http://dx.doi.org/10.23919/saiee.2018.8531795.

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Bhadauria, Beer S., Atul K. Srivastava, Nirmal C. Sacheti, and Pallath Chandran. "Gravity Modulation of Thermal Instability in a Viscoelastic Fluid Saturated Anisotropic Porous Medium." Zeitschrift für Naturforschung A 67, no. 1-2 (2012): 1–9. http://dx.doi.org/10.5560/zna.2011-0045.

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Анотація:

The present paper deals with a thermal instability problem in a viscoelastic fluid saturating an anisotropic porous medium under gravity modulation. To find the gravity modulation effect, the gravity field is considered in two parts: a constant part and an externally imposed time-dependent periodic part. The time-dependent part of the gravity field, which can be realized by shaking the fluid, has been represented by a sinusoidal function. Using Hill’s equation and the Floquet theory, the convective threshold has been obtained. It is found that gravity modulation can significantly affect the st

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Balbahadur, A., and R. Kirk. "Part I?Theoretical Model for a Synchronous Thermal Instability Operating in Overhung Rotors." International Journal of Rotating Machinery 10, no. 6 (2004): 469–75. http://dx.doi.org/10.1080/10236210490504021.

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Balbahadur, A., and R. Kirk. "Part II?Case Studies for a Synchronous Thermal Instability Operating in Overhung Rotors." International Journal of Rotating Machinery 10, no. 6 (2004): 477–87. http://dx.doi.org/10.1080/10236210490504067.

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Scirè, Daniele, Giuseppe Lullo, and Gianpaolo Vitale. "Self-Heating Induced Instability of a Non-Linear Inductor in a SMPS: a Case Study." Renewable Energy and Power Quality Journal 21, no. 1 (2023): 656–61. http://dx.doi.org/10.24084/repqj21.440.

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Анотація:

This paper proposes a case study to show that the non-linear operation of a power inductor in a SMPS can induce instability of the control system leading to overheating of the inductor beyond its allowable temperature and to an excessive peak of the maximum current. The case study is performed by a commercial ferrite inductor employed in a synchronous boost converter encompassing a control system to adjust the duty cycle, assuring a constant output voltage. The thermal transient is described by the time domain waveforms and thermal images.

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Yoshida, Yoshiki, Yoshifumi Sasao, Kouichi Okita, Satoshi Hasegawa, Mitsuru Shimagaki, and Toshiaki Ikohagi. "Influence of Thermodynamic Effect on Synchronous Rotating Cavitation." Journal of Fluids Engineering 129, no. 7 (2007): 871–76. http://dx.doi.org/10.1115/1.2745838.

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Анотація:

Synchronous rotating cavitation is known as one type of cavitation instability, which causes synchronous shaft vibration or head loss. On the other hand, cavitation in cryogenic fluids has a thermodynamic effect on cavitating inducers because of thermal imbalance around the cavity. It improves cavitation performances due to delay of cavity growth. However, relationships between the thermodynamic effect and cavitation instabilities are still unknown. To investigate the influence of the thermodynamic effect on synchronous rotating cavitation, we conducted experiments in which liquid nitrogen was

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Olsson, Karl-Olof. "Some Unusual Cases of Rotor Instability." Journal of Vibration and Acoustics 125, no. 4 (2003): 477–81. http://dx.doi.org/10.1115/1.1606692.

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Анотація:

In the paper presented here three peculiar cases of rotor instability are presented. The first is a tilting-pad bearing used as an intershaft bearing in a two-spool gas turbine. It was initially chosen for its good stability properties. However, in a deeper study it was found that those benefits are greatly reduced when both inner shaft and outer bearing are rotating. The second case comprises a turbine which showed a very strange performance with vibrations alternating between heavy and mild amplitudes. The periods were a couple of minutes long. After a more elaborate instrumentation was inst

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Bhadauria, B. S. "Unsteady Heating of Rayleigh-Benard Convection." Zeitschrift für Naturforschung A 59, no. 4-5 (2004): 266–74. http://dx.doi.org/10.1515/zna-2004-4-511.

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Анотація:

The linear thermal instability of a horizontal fluid layer with time-periodic temperature distribution is studied with the help of the Floquet theory. The time-dependent part of the temperature has been expressed in Fourier series. Disturbances are assumed to be infinitesimal. Only even solutions are considered. Numerical results for the critical Rayleigh number are obtained at various Prandtl numbers and for various values of the frequency. It is found that the disturbances are either synchronous with the primary temperature field or have half its frequency. - 2000 Mathematics Subject Classif

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Більше джерел

Дисертації з теми "Synchronous thermal instability"

Carroll, Brian R. "Synchronous Thermal Instability Evaluation of Medium Speed Turbocharger Rotor-Bearing Systems." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/32886.

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Анотація:

Rotors in fluid-film bearing supported turbomachinery are known to develop elliptical orbits as a result of rotor-bearing interactions, mass unbalance within the rotor, gravitational bending of the shaft and external excitation. In synchronous whirl, where the speed at which the shaft travels about the orbit is equal to the rotational speed of the rotor, temperature gradients may develop across the journal as a result of viscous shear in the bearingâ s lubricant film. This thermal gradient leads to bending of the shaft in a phenomenon known as The Morton Effect. Such thermally induced bend

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Zhang, Silun. "Analyse de l'effet Morton dans les turbines à vapeur." Thesis, Poitiers, 2019. http://www.theses.fr/2019POIT2260.

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Анотація:

Dans le domaine de machine tournante (turbines à vapeurs, turbocompresseurs et autres turbomachines), l’effet Morton désigne la création d’une source d’excitation synchrone due à la déformation thermique du rotor dans les paliers hydrodynamiques. Par abus de langage, cette source phase des vibrations synchrones du rotor évoluent progressivement dans le temps. Dans la plupart des cas, l’effet Morton reste stable et les influences du balourd thermique sur les vibrations ne sont pas nuisibles au fonctionnement de la machine. Cependant, si les conditions sont favorables, le comportement dynamique

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GRIFFINI, DUCCIO. "Development of Predictive Models for Synchronous Thermal Instability." Doctoral thesis, 2017. http://hdl.handle.net/2158/1081044.

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Анотація:

The increasing demand of higher efficiency and increased equipment compactness is pushing the modern rotordynamic design towards higher and higher bearing peripheral speed. Due to the increased viscous dissipation, modern fluid film bearings are prone to the development of complex thermal phenomena that, under certain conditions, can result in synchronous thermal instability, often referred to as Morton effect. Although the phenomenon is known and studied from the late 1970s a lack of knowledge is highlighted in literature and the strategy to approach its prediction and analysis is yet debated

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Narain, Singh Amesh. "Investigation into high-speed thermal instability testing of synchronous turbo-generator rotors." Thesis, 2017. https://hdl.handle.net/10539/24190.

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Анотація:

A thesis submitted to the Faculty of Engineering, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Doctor of Philosophy. Johannesburg, 2017<br>The research presented in this thesis conclusively shows that the most effective method to perform synchronous turbo-generator rotor Thermal Instability Testing is by utilising the current injection method of condition assessment. Analysis of the experiences of a local utility for well over a decade has uncovered a high number of rotors failing thermal instability testing in recent years. This trend has

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Тези доповідей конференцій з теми "Synchronous thermal instability"

Kirk, R. Gordon, and Zenglin Guo. "Design Tool for Prediction of Thermal Synchronous Instability." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12966.

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Анотація:

The investigation of thermal synchronous instability has been active since the mid 1990’s and the number of machines experiencing this type of instability continues to rise. The initial design threshold speed criteria was developed and compared to available case studies during 1998–2001. Further advances were made from 2002–2007 in the prediction of the bearing journal thermal hot spot in addition to improved pre and post processing capability. These improvements made the design tool more useful for prediction of thermal synchronous instability for shaft overhangs. More recent work reported in

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Shin, Dongil, Alan B. Palazzolo, and Xiaomeng Tong. "Squeeze Film Damper Suppression of Thermal Bow: Morton Effect Instability." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14825.

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Анотація:

Abstract The Morton Effect (ME) is a synchronous vibration problem in turbomachinery caused by the non-uniform viscous heating around the journal circumference, and its resultant thermal bow and ensuing synchronous vibration. This paper treats the unconventional application of the SFD for the mitigation of ME-induced vibration. Installing a properly designed squeeze film damper (SFD) may change the rotor’s critical speed location, damping and deflection shape, and thereby suppress the vibration caused by the ME. The effectiveness of the SFD on suppressing the ME is tested via linear and nonlin

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Guo, Zenglin, and Gordon Kirk. "Morton Effect Induced Synchronous Instability in Mid-Span Rotor-Bearing Systems: Part 1—Mechanism Study." In ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28341.

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Анотація:

The Morton Effect in the rotor–bearing systems may lead to an unstable operation. In Part 1, the mechanism of the Morton Effect induced thermal instability in the mid-span rotor systems has been studied. First, the equivalent thermal induced imbalance is introduced and its magnitude and directions are assumed, to represent the viscous thermal effect on the rotor systems. Then, the simplified rotor and bearing models are adopted for the derivation of analytical expressions. The results show that there exists a threshold of instability due to the Morton Effect in the mid-span rotors. Based on th

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Singh, A. Narain, W. A. Cronje, and W. Doorsamy. "Investigation of thermal instability testing on synchronous generator rotors using an experimental direct mapping method." In 2017 IEEE 26th International Symposium on Industrial Electronics (ISIE). IEEE, 2017. http://dx.doi.org/10.1109/isie.2017.8001267.

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Faulkner, H. B., W. F. Strong, and R. G. Kirk. "Thermally Induced Synchronous Instability of a Radial Inflow Overhung Turbine: Part II." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-4174.

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Анотація:

Abstract This paper is in two parts, and concerns the lateral dynamics of a large turbocharger rotor with overhung wheels. Initial rotor dynamic analysis indicated no excessive motion in the operating speed range. However, testing showed excessive motion, which was initially traced to the radial-inflow turbine wheel becoming loose on the shaft, due to transient differential thermal expansion in the wheel on startup. The attachment of the wheel was modified to eliminate this problem. The discussion up to this point is in Part I of the paper, and the remainder is in Part II. The wheel attachment

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Faulkner, H. B., W. F. Strong, and R. G. Kirk. "Thermally Induced Synchronous Instability of a Radial Inflow Overhung Turbine: Part I." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-4063.

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Olsson, Karl-Olof. "Some Unusual Cases of Rotor Instability." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/vib-21375.

Повний текст джерела

Анотація:

Abstract In the paper presented here three peculiar cases of rotor instability are presented. The first is a tilting-pad bearing used as an intershaft bearing in a two-spool gas turbine. It was initially chosen for its good stability properties. However, in a deeper study it was found that those benefits are greatly reduced when both inner shaft and outer bearing are rotating. The second case comprises a turbine which showed a very strange performance with vibrations alternating between heavy and mild amplitudes. The periods were a couple of minutes long. After a more elaborate instrumentation

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Kirk, Gordon. "Rotating Machinery Long Coupling Spacer Related Vibration." 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/detc2015-46718.

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Анотація:

The increased speed and power level of rotating machinery most often bring the problem of non-synchronous instability. Many of the current most interesting problems, have been caused by synchronous thermal instability. These problems are related to the machinery overhangs predominantly, many are due to heavy couplings and the associated fluid film bearing non-uniform heating of the rotor shaft coupling end journal area. For couplings with long spacer tubes, other causes of excessive synchronous vibration are worthy of discussion. Long coupling spacer tubes with balance correction made at low s

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Berot, François, and Hervé Dourlens. "On Instability of Overhung Centrifugal Compressors." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-202.

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Анотація:

This paper describes the synchronous vibration instability problem that occurred on a series of large overhung centrifugal compressors. The first part of this paper deals with the identification and display of the instability phenomenon: cyclic vibration amplitude variations and phase angle rotation occuring during testing of overhung centrifugal compressors. After numerical simulations and analysis of the test results, the bearing design has been identified as the cause of the problem. The second part describes the numerical study of the instability of the compressor. This problem is related

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Guo, Zenglin, and Gordon Kirk. "Morton Effect Induced Synchronous Instability in Mid-Span Rotor-Bearing Systems: Part 2—Models and Simulations." In ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28342.

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Анотація:

The mechanism of the Morton Effect induced synchronous instability has been discussed in Part 1, using an assumption of isotropic linear bearings. The second part of the current study will now focus on the more realistic systems, mid-span rotors supported by the hydrodynamic journal bearings. First, the models to calculate the thermal bending of the shaft and the temperature distribution across the journal surface are established. This can be used to calculate the equivalent thermal imbalance. The calculations of the temperature difference and its equivalent thermal imbalance using hydrodynami

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