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Relevant bibliographies by topics / Rotor dynamics, Tilting Pad Journal Bearing, Turbomachinery

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Journal articles
Dissertations / Theses
Book chapters
Conference papers

Academic literature on the topic 'Rotor dynamics, Tilting Pad Journal Bearing, Turbomachinery'

Author: Grafiati

Published: 10 March 2023

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Journal articles on the topic "Rotor dynamics, Tilting Pad Journal Bearing, Turbomachinery"

1

Dimond, T. W., P. N. Sheth, P. E. Allaire, and M. He. "Identification Methods and Test Results for Tilting Pad and Fixed Geometry Journal Bearing Dynamic Coefficients – A Review." Shock and Vibration 16, no. 1 (2009): 13–43. http://dx.doi.org/10.1155/2009/708363.

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Fluid film journal bearings (FFBs) are used to support high-speed rotors in turbomachinery which often operate above the rotor first bending critical speed. The FFBs provide both lateral support and dynamic coefficients: stiffness, damping, and mass terms, related to machine vibrations. Detailed numerical values of the bearing dynamic characteristics are necessary for proper design and operation of rotating machinery.The methods of the identification of fluid film journal bearing static and dynamic characteristics, particularly the bearing stiffness, damping, and mass coefficients, from measur

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Ciulli, Enrico, Paola Forte, Flavio Antonelli, Roberto Minelli, and Daniele Panara. "Tilting Pad Journal Bearing Ball and Socket Pivots: Experimental Determination of Stiffness." Machines 10, no. 2 (2022): 81. http://dx.doi.org/10.3390/machines10020081.

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Tilting pad journal bearings (TPJB) are used in turbomachinery for their stability at high speeds. For design purposes, it is necessary to preliminarily investigate the turbomachine rotor dynamic behavior by simulation. The dynamic characteristics of all components must be known as precisely as possible and experimental validation of each single model is required. While a lot of work has been carried out on bearings, the ball-and-socket stiffness is still estimated by means of Hertzian formulas. Recently, some authors have used the finite element method, but it seems that nothing has been done

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Chan, D. S. H. "Nonlinear Analysis of Rotordynamic Instabilities in High-Speed Turbomachinery." Journal of Engineering for Gas Turbines and Power 118, no. 1 (1996): 122–29. http://dx.doi.org/10.1115/1.2816527.

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A nonlinear approach based on the method of averaging has been developed to study unstable lateral vibrations of rotors in high-speed turbomachinery. The method makes use of an extended concept of bearing dynamic coefficients, which are defined by applying small perturbations to the dynamic equilibrium positions. The approach has been applied to determine the stability threshold of flexible rotors supported on short and tilting-pad journal bearings, respectively. Stability performance of systems supported on short journal bearings is improved by the presence of mass unbalance. However, for fle

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4

Ying, Jiayang, Yinghou Jiao, and Zhaobo Chen. "Nonlinear Dynamics Analysis of Tilting Pad Journal Bearing-Rotor System." Shock and Vibration 18, no. 1-2 (2011): 45–52. http://dx.doi.org/10.1155/2011/213742.

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The nonlinear dynamics theory is increasingly applied in the dynamics analysis of tilting pad journal bearing-rotor system. However, extensive work on system dynamics done previously neglects the influence caused by the moment of inertia of the pad. In this paper, a comparison is made between the responses of the rotor in the bearings with and without pad inertia effect. Taking the Jeffcott rotor system as an example, the characteristics of bearing-rotor system, such as bifurcation diagram, cycle response, frequency spectrum, phase trajectories, and Poincaré maps, were attained within a certai

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Kirk, R. G., and S. W. Reedy. "Evaluation of Pivot Stiffness for Typical Tilting-Pad Journal Bearing Designs." Journal of Vibration and Acoustics 110, no. 2 (1988): 165–71. http://dx.doi.org/10.1115/1.3269494.

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The manufacturers of high speed turbomachinery are concerned with the accurate prediction of rotor response and stability. One major factor in the placement of system critical speeds and amplification factors is the stiffness and damping of both the fluid-film bearing and support structure. Typical calculated results for tilting-pad fluid-film bearings have neglected the influence of the point or line contact of the pivot support for the individual pads. This paper will review the equations developed considering the Hertzian contact stress and deformation theory and present the equations for p

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Brancati, Renato, Stefano Pagano, Ernesto Rocca, Michele Russo, and Riccardo Russo. "Experimental Investigations on Tilting Pad Journal Bearings." International Journal of Rotating Machinery 5, no. 3 (1999): 181–91. http://dx.doi.org/10.1155/s1023621x99000160.

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The results of a survey conducted on an experimental system consisting of a rigid rotor supported on two radial bearings each with five tilting pads is presented. In particular, the system was set up in order to assess the dynamic behaviour of the bearing in unusual operating conditions. The response of the bearing to different unbalance values was determined after acquiring and analysing the orbits described by the journal axis for assigned unbalance values in different operating conditions. Analysis of the results shows some particular operating features that were not entirely predicted by t

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Vázquez, J. A., and L. E. Barrett. "Modeling of Tilting-Pad Journal Bearings with Transfer Functions." International Journal of Rotating Machinery 7, no. 1 (2001): 1–10. http://dx.doi.org/10.1155/s1023621x0100001x.

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Tilting-pad journal bearings are widely used to promote stability in modern rotating machinery. However, the dynamics associated with pad motion alters this stabilizing capacity depending on the operating speed of the machine and the bearing geometric parameters, particularly the bearing preload. In modeling the dynamics of the entire rotor-bearing system, the rotor is augmented with a model of the bearings. This model may explicitly include the pad degrees of freedom or may implicitly include them by using dynamic matrix reduction methods. The dynamic reduction models may be represented as a

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Feng, N. S., and E. J. Hahn. "Vibration Analysis of Statically Indeterminate Rotors With Hydrodynamic Bearings." Journal of Tribology 120, no. 4 (1998): 781–88. http://dx.doi.org/10.1115/1.2833779.

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In statically indeterminate rotor bearings systems, where the rotor is supported by one or more hydrodynamic bearings, the reactions at each hydrodynamic bearing, and hence its stiffness and damping properties depend not only on the bearing type, the operating conditions and the bearing dimensions but also on the relative lateral alignment between the journal and the bearing housing; the alignment, therefore, has a significant influence on the system stability and unbalance response. Additional complications arise if nonsymmetric bearing types such as elliptic or tilting pad bearings are prese

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Ma, Hui, Zhao Hui Ren, Ji Shuang Dai, and Bang Chun Wen. "Research on Dynamics of Rotor Systems in Large Centrifugal Compressor." Key Engineering Materials 419-420 (October 2009): 121–24. http://dx.doi.org/10.4028/www.scientific.net/kem.419-420.121.

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It is important to study system vibration characteristics for improving product quality and ensuring safety operation of units. In this paper, some dynamics of rotor systems are studied in large centrifugal compressor. The models of diaphragm coupling and tilting pad bearing are established by appropriate simplification. The finite element model of rotors with bearing and coupling is set up by taking interrelation of these subsystems into account. The unbalance responses of journal are computed based on the relative standard. The effect of bearing parameters (length-diameter ratio, clearance r

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Abu-Mahfouz, Issam, and Maurice L. Adams. "Numerical Study of Some Nonlinear Dynamics of a Rotor Supported on a Three-Pad Tilting Pad Journal Bearing (TPJB)." Journal of Vibration and Acoustics 127, no. 3 (2005): 262–72. http://dx.doi.org/10.1115/1.1888593.

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The use of tilting pad journal bearings (TPJBs) has increased in the recent past due to their stabilizing effects on the rotor bearing system. However, in this paper two mechanisms capable of producing instabilities in terms of subharmonic and chaotic motions are suggested. The first one is that of a centrally loaded pad with rotor unbalance excitations. The second one represents a concentric rotor (or a vertical rotor) acted upon by centering sprigs and large unbalance excitations. Extensive numerical experimentation shows, for certain parameters, subharmonic, quasi-periodic, and chaotic moti

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Dissertations / Theses on the topic "Rotor dynamics, Tilting Pad Journal Bearing, Turbomachinery"

1

NOCCIOLINI, DANIELE. "Development and Validation of an Efficient TEHD Model of Tilting Pad Journal Bearings." Doctoral thesis, 2017. http://hdl.handle.net/2158/1080940.

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The constant increase of turbomachinery rotational speed has brought the design and the use of journal bearings to their very limits: tilting pad journal bearings (TPJBs) have been introduced for high-speed/high-load applications due to their intrinsic stability properties and can be used both in transient and steady-state operations obtaining superior performances. TPJBs operation involves different physical aspects, like the pads flexibility and the heat exchange between solids and fluids. An accurate analysis of the TPJBs behavior is essential for a successful design and operation of the sy

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Book chapters on the topic "Rotor dynamics, Tilting Pad Journal Bearing, Turbomachinery"

1

Chatterton, Steven, Paolo Pennacchi, Phuoc Vinh Dang, and Andrea Vania. "Identification Dynamic Force Coefficients of a Five-Pad Tilting-Pad Journal Bearing." 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_76.

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Chatterton, Steven, Paolo Pennacchi, Phuoc Vinh Dang, and Andrea Vania. "A Test Rig for Evaluating Tilting-Pad Journal Bearing Characteristics." 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_75.

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He, Minhui, C. Hunter Cloud, and José A. Vázquez. "The Effects of Temporal Fluid Inertia on Tilting Pad Journal Bearing Dynamics." 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_66.

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Hagemann, Thomas, and Hubert Schwarze. "A Theoretical Study on Frequency Effects on Tilting-Pad Journal Bearing Dynamic Coefficients." 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_87.

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Conference papers on the topic "Rotor dynamics, Tilting Pad Journal Bearing, Turbomachinery"

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Dang, Phuoc Vinh, Steven Chatterton, Paolo Pennacchi, Andrea Vania, and Filippo Cangioli. "Behavior of Tilting–Pad Journal Bearings With Large Machining Error on Pads." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56674.

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The use of tilting pad journal bearings (TPJBs) has increased in recent years due to their stabilizing effects on the rotor bearing system. Most of the studies addressing steady state and dynamic behaviors of TPJBs have been evaluated by means of thermo-hydrodynamic (THD) models, assuming nominal dimensions for the bearing, (i.e., the physical dimensions of all pads are identical and loads applied along the vertical direction). However machining errors could lead to actual bearing geometry and dimensions different from the nominal ones. In particular, for TPJB the asymmetry of the bearing geom

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Liu, Binbin, Weimin Wang, Jinji Gao, and Jian Zhang. "Influence of Bearing Load on the Performance of Tilting-Pad Journal Bearing Under High Surface Velocity." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64263.

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Tilting-pad journal bearings (TPJBs) are dominant as shaft support in high-parameter turbomachinery, particularly in highspeed applications. Bearing test technology and high-precision model simulation are the key technologies for the development of high-end bearings. A bearing test platform which is based on the active magnetic bearing (AMB) loading and excitation is first designed and developed. Two large AMBs are used in the test rig as loader and exciter, and the system has a whole loading capacity up to 20000 N. As the bearing load is not always along the vertical direction, the performanc

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Zemella, Philipp, Thomas Hagemann, Bastian Pfau, and Hubert Schwarze. "Identification of Dynamic Coefficients of a Five-Pad Tilting Pad Journal Bearing up to Highest Surface Speeds." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14991.

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Abstract Tilting-pad journal bearings are widely used in turbomachinery industry due to their positive dynamic properties at high rotor speeds. However, the exact description of this dynamic behavior is still part of current research. This paper presents measurement results for a five-pad tilting-pad journal bearing in load between pivot configuration. The bearing is characterized by a nominal diameter of 100 mm, a length of 90 mm, and a pivot offset of 0.6. Investigations include results for surface speeds between 25 and 120 m/s and specific bearing loads ranging from 0.0 to 3.0 MPa. Results

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4

Conti, R., A. Frilli, E. Meli, et al. "Development and Validation of an Efficient TEHD Model of Tilting Pad Journal Bearings." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57401.

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The large success of Tilting Pad Journal Bearings (TPJBs) for the use in high speed/high load applications is due to their intrinsic stability properties, which allow superior rotor dynamic performances. TPJBs operation involves different physical phenomena, like the pads flexibility and the heat exchange between solids and fluids: an accurate analysis of these phenomena is fundamental in order to successfully employ TPJBs. In this paper, the authors, in cooperation with General Electric Nuovo Pignone, develop an innovative 3D TPJB modelling approach that allows an accurate analysis of the int

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5

San Andrés, Luis, Bonjin Koo, and Makoto Hemmi. "A Flow Starvation Model for Tilting Pad Journal Bearings and Evaluation of Frequency Response Functions: A Contribution Towards Understanding the Onset of Low Frequency Shaft Motions." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64822.

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Direct lubrication tilting pad journal bearings (TPJBs) require of less oil flow, reduce power consumption and offer cooler pad temperatures for operation at high surface speeds. Although apparently free of a hydrodynamic instability, the literature shows that direct lubrication TPJBs exhibit unexpected shaft vibrations with a broadband low frequency range, albeit small in amplitude. Published industrial practice demonstrates the inlet lubrication type, a reduced supply flow rate causing film starvation, and the bearing discharge conditions (evacuated or end sealed) affect the onset, gravity a

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6

Ding, Aoshuang, and Xuesong Li. "Numerical Investigation for Characteristics and Oil-Air Distributions of a Tilting-Pad Journal Bearing Under Different Loads." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-15151.

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Abstract This paper analyses the flow characteristics and oil-air distributions of oil flows in a tilting-pad journal bearing under different bearing loads. This titling-pad journal bearing is working at 3000 rpm rotation speed and its minimum film thicknesses have been measured under different loads from 180 kN to 299 kN. Based on the previous researches of this bearing under 180 kN, the gaseous cavitation and low-turbulence flow exists in this bearing flow. A suitable gaseous cavitation model and the SST model with low-Re correction are used in the film flow simulations. With the rotor and p

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Chatterton, Steven, Filippo Cangioli, Paolo Pennacchi, Andrea Vania, and Phuoc Vinh Dang. "Development of an Active Control System for Rotating Machinery by Means of Tilting Pad Journal Bearings." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56632.

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The current design trend of rotating machines like turbo-generators, compressors, turbines, and pumps is focused on obtaining both high dynamic performances and high versatility of machines in different operating conditions. The first target is nowadays achieved by equipping machines with tilting pad journal bearings. For the second target, State-of-the-Art researches are focused on the development of active systems able to adapt the dynamic behavior of the machine to the external environment and new operating conditions. Typical causes of large vibration in rotating machines are faults, resid

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8

Arihara, Hirotoshi, Yuki Kameyama, Yoshitaka Baba, and Luis San Andrés. "A Thermoelastohydrodynamic Analysis for the Static Performance of High-Speed Heavy Load Tilting-Pad Journal Bearing Operating in the Turbulent Flow Regime and Comparisons to Test Data." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-77151.

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Tilting-pad journal bearings (TPJBs) ensure rotordynamic stability that could otherwise produce dangerously large amplitude rotor oil-whirl/whip motions in high speed rotating machinery. Currently, highly efficient turbo compressors demand an ever increasing rotor surface speed and specific load on its support bearings. The accurate prediction of bearing performance is vital to guarantee reliable products, specifically with regard to reducing maximum bearing pad temperature and drag power losses, and operating with the least flow rate while still maximizing load capacity. The hydrodynamic pres

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9

Kim, Tae Ho, Kyung Eun Jang, and Tae Gyu Choi. "Rotordynamic Performance Predictions of Flexure Pivot Tilting Pad Bearings and Comparison to Published Test Data." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56284.

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This paper presents performance predictions for a Flexure Pivot® tilting pad bearing (FPTPB) and comparisons to published test data. The FPTPB has pads that tilt about a web pivot. The pivot is designed to have little rotational stiffness, which improves its rotordynamic stability. The Reynolds equation for an isothermal and isoviscous fluid was used to calculate the film pressure using the finite element method. The Newton–Raphson method was used to determine the journal eccentricity, journal attitude angle, and pivot deflections (tilting angle, and radial and circumferential displacements) s

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Ferraro, Riccardo, Alice Innocenti, Mirko Libraschi, et al. "Dynamic Identification of 280mm Diameter Tilting Pad Journal Bearings: Test Results and Measurement Uncertainties Assessment of Different Designs." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14718.

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Abstract Tilting pad journal bearings (TPJBs) are crucial elements in turbomachinery applications providing stiffness and damping characteristics that determine rotor system dynamic behavior. Hence, a correct design and an accurate dynamic properties prediction is fundamental for the successful industrial operation of rotating machinery. Current design trends in turbomachinery aiming at higher efficiency and power through weight optimization and higher operating speeds determine the development of large flexible rotors that are particularly important from the rotordynamic standpoint. The dynam

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