Relevant bibliographies by topics / Tilting pad thrust bearing

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

Academic literature on the topic 'Tilting pad thrust bearing'

Author: Grafiati
Published: 4 June 2025
Last updated: 14 July 2025

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Journal articles on the topic "Tilting pad thrust bearing"

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Murdzia, Edward, and Stanisław Strzelecki. "CALCULATIONS OF TILTING-PAD THRUST BEARINGS." Tribologia 298, no. 4 (2022): 27–36. http://dx.doi.org/10.5604/01.3001.0015.8366.

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The application of thrust bearings in different engineering designs generates problems of thermal state, which generates the wear of the fixed or tilting pads of bearings. These problems can be avoided by means of proper methods and numerical algorithms of calculations of the bearing static characteristics, including the maximum oil film temperature. The knowledge of thermal state of bearings should assure safe, reliable, and durable bearing operation and is important for the designers of thrust bearings. This paper presents the results of calculations of some static characteristics of a tilting-pad thrust bearing, including its maximum oil film temperature. Numerical solution by means of finite differences was applied for the solution of geometry, Reynolds, energy, and viscosity equations. Adiabatic oil film laminar flow in the bearing gap was considered. The developed code of the computation of bearing performances creates a tool that leads to the solution of thermal problems. Different values of operating speeds were assumed.
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Yang, Shifu, Wenbin Zheng, Mulong Jiang, Shiyuan Pei, and Hua Xu. "A comparative experimental study on large size center and bi-directional offset spring-bed thrust bearing." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 1 (2019): 134–44. http://dx.doi.org/10.1177/1350650119855241.

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The central support tilting thrust bearing is widely used in the motor-generator unit, and the central support tilting thrust bearing performs poorly compared with the offset bearing. In order to improve the performance of the thrust bearing capable of the bidirectional operation, a spring-supported switching tilting thrust bearing was designed, which could run under offset condition at both clockwise and counterclockwise. In order to verify the reliability of the bearing, we designed a true size thrust bearing test bench and measured the performance parameters of the temperature, pressure, oil film thickness, and power loss of the pad. This article introduces in detail the operation mechanism of the bidirectional offset spring-bed tilting thrust bearing. The bidirectional offset spring-bed tilting thrust bearing structure and the central support bearing structure were compared and tested. The test results of the performance difference of large tilting pad bearings with different structures were obtained. According to the experiment, the spring support structure has good adaptability, and the improved bidirectional offset support bearing not only has higher bearing capacity, but also has better performance in all aspects of temperature rise and loss than the central support bearing. The actual size experiment provides the experimental data for the theoretical calculation of large tilting pad bearings, providing a more accurate basis for the bearing performance and safety assessment.
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Smith, Edward H. "Observer-Based Control of Tilting-Pad Thrust Bearings." Lubricants 10, no. 1 (2022): 11. http://dx.doi.org/10.3390/lubricants10010011.

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The active control of hydrodynamic bearings is beginning to receive more attention in the pursuit of lower power losses and reduced maintenance. This paper presents a method by which, from simple measurements, rich information can be deduced from a running bearing that can used to modify the operating parameters of the unit. The bearing is a line-pivot, unidirectional, steadily loaded, directly lubricated tilting pad thrust bearing. This control is achieved by designing an Observer whose inputs include the output measurement(s) from the bearing. The Observer is, in some ways, an inverse model of the bearing (or Plant) that runs in parallel to the bearing and estimates the states of the bearing, such as the applied load, pivot height, minimum film thickness, maximum temperature, effective temperature and power loss. These estimated parameters can then be used in a control algorithm to modify bearing parameters such as inlet temperature or pivot location. It is demonstrated that disturbances in the load on the bearing can be detected simply by measuring a representative temperature in the bearing or changes in pivot height. Appropriate corrective action can then be employed. Whilst only steady-state operation is considered, the method could be developed to study time-varying situations.
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Zhai, Liming, Yongyao Luo, Xin Liu, Funan Chen, Yexiang Xiao, and Zhengwei Wang. "Numerical simulations for the fluid-thermal-structural interaction lubrication in a tilting pad thrust bearing." Engineering Computations 34, no. 4 (2017): 1149–65. http://dx.doi.org/10.1108/ec-08-2015-0209.

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Purpose The purpose of this paper is to analyze lubrication characteristics of a tilting pad thrust bearing considering the effect of the thermal elastic deformation of the pad and collar. Design/methodology/approach This study used the fluid–solid interaction (FSI) technique to investigate the lubrication characteristics of a tilting pad thrust bearing for several typical operating conditions. The influences of the rotational speed, the thrust load and the oil supply temperature on the lubrication characteristics were analyzed. Findings The three-dimensional (3D) film model clearly shows that there is no pressure gradient but large temperature gradients across the film thickness. The wall heat transfer coefficients on the pad surfaces distribute in a very complex way and change within a large range. The rotational speed, the thrust load and the oil supply temperature have great but different influences on the lubrication characteristics. Originality/value This paper has preliminarily revealed the lubrication mechanism of the tilting-pad thrust bearings. The 3D FSI method is suggested to evaluate the thermal-elastic-hydrodynamic deformations of thrust bearings instead of the conventional method which iteratively solves the Reynolds equation, the energy equation, the heat conduction equation and the elastic equilibrium equation. Using FSI method, the heat transfer coefficients on the pad surfaces can be evaluated better.
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Glavatskih, Sergei B. "Evaluating Thermal Performance of a PTFE-Faced Tilting Pad Thrust Bearing." Journal of Tribology 125, no. 2 (2003): 319–24. http://dx.doi.org/10.1115/1.1506329.

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This paper compares and analyses operating characteristics of equalizing tilting pad thrust bearings with babbitt and polytetrafluoroethylene (PTFE) composite facings. Each bearing arrangement included six pads with an outer diameter of 228.6 mm and 60 percent offset. The babbitted bearing was typical of design in general use. A PTFE composite was applied instead of the babbitt to a similar bearing. Bearings were tested at different load-speed combinations in the fully flooded mode. Pad temperature distributions, collar temperatures and bearing friction torque were continuously measured. Test results show that the PTFE composite provides excellent thermal insulation so that pad thermal crowning is eliminated. PTFE-faced bearings operate with lower power loss and slightly higher collar temperatures compared to similar babbitted bearings.
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Yu, Xiao Dong, Hui Jiang, Xiu Li Meng, et al. "Lubricating Characteristics of Circular Tilting Pad Thrust Bearing." Advanced Materials Research 148-149 (October 2010): 267–70. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.267.

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In order to solve lubricating problem of circular tilting pad thrust bearing in the heavy equipment, lubricating characteristics mathematical model is established based on the Computational Fluid Dynamics and lubricating theory, the Finite Element Method is used to compute the lubricating characteristics of a circular tilting pad thrust bearing, and figure out thickness distribution of oil film, pressure distribution of oil film, temperature distribution of oil film, power loss and fluid flow, etc. lubricating characteristics parameters by self-compiling software program. Experiments testify the validity of the lubricating characteristics mathematical model. Through this method, the safety of a circular tilting pad thrust bearing can be forecasted, and the optimal design of such products can be achieved, and provides reasonable data for actual design and experiment, and decreases economy loss.
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Mikula, Andrew M. "Evaluating Tilting-Pad Thrust Bearing Operating Temperatures." A S L E Transactions 29, no. 2 (1986): 173–78. http://dx.doi.org/10.1080/05698198608981675.

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Si, Xiaohui, Wenxiu Lu, and Fulei Chu. "Lateral Vibration of Hydroelectric Generating Set with Different Supporting Condition of Thrust Pad." Shock and Vibration 18, no. 1-2 (2011): 317–31. http://dx.doi.org/10.1155/2011/867252.

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The variations of the supporting condition, which change the stiffness of tilting pad thrust bearing, may alter the dynamic behavior of the rotor system. The effects of supporting condition of thrust pad on the lateral vibration of a hydroelectric generating set are investigated in this paper. The action of a thrust bearing is described as moments acting on the thrust collar, and the tilting stiffness coefficients of thrust bearing are calculated. A model based on typical beam finite element method is established to calculate the dynamic response, and the effects of supporting conditions such as elastic oil tank support, different heights of the thrust pads with rigid support are discussed. The results reveal that the influence of thrust bearing is small when the elastic oil tanks work normally. When the supporting conditions turn to be rigid due to the oil leakage, the differences of thrust pad heights have evident influence on the load distribution of the thrust pads; while the effects on the tilting stiffness of the thrust bearing and the amplitude of the lateral shaft vibration is small when the maximum load on thrust pads is smaller than the allowable value.
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Tieu, A. K. "Thermo-Elasto-Hydrodynamic-Analysis of Step and Diaphragm Thrust Bearing." Journal of Tribology 108, no. 2 (1986): 225–30. http://dx.doi.org/10.1115/1.3261167.

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In this paper, the beneficial effects of elastic diaphragm deflection within a confined inlet area are demonstrated when it is incorporated in a conventional tilting bearing (diaphragm tilting bearing), step bearing (step and diaphragm bearing), and parallel bearing (diaphragm bearing). Rigid support of the diaphragm pad is required to utilize full potential of this bearing. The step and diaphragm pad provides a physical bearing that has the capacity approaching the optimum bearing which was based on numerical optimization.
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Wang, Zhanchao, Fei Guo, Ying Liu, Xiangfeng Liu, and Yuming Wang. "Design and fabrication of the tilting-pad thrust bearing surface profile." Industrial Lubrication and Tribology 70, no. 8 (2018): 1402–7. http://dx.doi.org/10.1108/ilt-01-2018-0043.

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PurposeThis paper aims to design a new surface profile with simpler processing technology, which makes the bearing load carrying capacity (LCC) close to that of conventional tilting-pad thrust bearing.Design/methodology/approachThe paper analyzes the LCC of the thrust pad with crown profile and designs a new profile, whose performance is similar to the crown profile. The laser method is introduced to fabricate the new profile. The profile with tiny crown height can be fabricated by the laser with the proper parameters.FindingsIt was found that there is an optimum value, which is best in terms of the capacity of tilting-pad thrust bearing reach. The new profile with proper parameters can replace the crown profile.Originality/valueThe new profile can replace the crown profile and is easier to be made. The new design method could be adopted for designing the pad surface profile of the tilting-pad thrust bearing.
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Dissertations / Theses on the topic "Tilting pad thrust bearing"

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Glavatskikh, Sergei B. "On the hydrodynamic lubrication in tilting pad thrust bearings /." Luleå, 2000. http://epubl.luth.se/1402-1544/2000/34/index.html.

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Denis, Sébastien. "Analyse dynamique d'une ligne d'arbre verticale supportée par une butée à patins oscillants." Thesis, Poitiers, 2014. http://www.theses.fr/2014POIT2335/document.

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Les problèmes vibratoires sont l'une des principales causes des maintenances effectuées sur les turbines de barrages hydroélectrique en France. Dans cette thèse CIFRE, subventionnée par la Division Technique Générale d’Électricité de France à Grenoble, nous voulons étudier numériquement les phénomènes physiques en jeu.Pour cela, chaque partie composant ce type de machine tournante est modélisée : la ligne d'arbre, les accouplements rigides, les paliers hydrodynamiques, la butée hydrodynamique à patins oscillants, les étanchéités et les efforts électromagnétiques. Celui du rotor est basé sur une approche classique 1D, prenant en compte des défauts d'accouplement rigide. Les paliers hydrodynamiques peuvent être alimentés par des rainures hélicoïdales : ceci est pris en compte dans la modélisation des paliers via un changement de variable dans l'équation de Reynolds. Concernant la butée hydrodynamique à patins oscillants, l'équation de Reynolds est explicitée en fonction des paramètres du système (rotor et patins). Un cas test est également présenté afin d'évaluer les différentes approches possibles pour l'intégration dans la modélisation du rotor et pour mieux appréhender la réponse dynamique d'une butée. Les joints d'étanchéités sont modélisés en linéarisant les efforts hydrauliques gouvernés par les équations du "bulk-flow" et sont donc représentés par des coefficients dynamiques de masse, d'amortissement et de raideur. Les efforts électromagnétiques au niveau de l'alternateur sont pris en compte via une formulation analytique des forces d'attraction sur chaque paire de pôles. Cela permet de gérer, par exemple, des défauts d'ovalisation ou de positionnement du stator.Une seconde partie est consacrée à l'étude d'une turbine complète. Y sont présentées différentes études de sensibilités des défauts les plus courants sur ce type de machine, le but étant d'en connaître l'influence sur le comportement dynamique de l'ensemble du rotor<br>Vibration problems are one of the main causes leading to maintenances performed on the turbines of hydroelectric power generation systems in France. In this CIFRE dissertation, financed by Division Technique Générale d'Électricité de France in Grenoble, we shall numerically study the physical phenomena involved in turbine vibrations of this kind.Hence, each component of this type of rotating machinery is modeled: the rotor, the rigid coupling, the hydrodynamic bearings, the hydrodynamic tilting pad thrust bearing, the annular seals and the electromagnetic forces. The model of the rotor is based on classical 1D approach taking into account the defects of the rigid coupling. The hydrodynamic bearings can be fed by helicoidally grooves. This feature is taken into account in the numerical model of journal bearing by applying a variable transformation to the Reynolds equation. For the tilting pad thrust bearing, the Reynolds equation takes into account the displacements and the velocities of both the pads and the rotor. A test case is presented for evaluating the different numerical approaches of the tilting pad thrust bearing that can be integrated in a rotordynamic analysis. The annular seals are modeled by using linearized hydraulic efforts (i.e. stiffness, damping and added mass dynamic coefficients) modeled by the "bulk flow" system of equations. The electromagnetic efforts in the alternator are taken into account by using an analytic model of the forces of each pair of poles. This enables to tackle ovalisation or eccentricity defects of the stator.A second part is dedicated to the numerical study of a complete turbine. Different studies dealing with sensitivity analyses of most often-encountered defects of this type of rotating machinery are presented, the goal being to underline their influence on the dynamic behavior of the whole rotor
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Hensley, John Eric. "Rotordynamic coefficients for a load-between-pad, flexible-pivot tilting pad bearing at high loads." Texas A&M University, 2006. http://hdl.handle.net/1969.1/4404.

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The dynamic and static performance of a flexure-pivot tilting pad bearing is presented at a load between pad configuration for various load and speed combinations. A similar work performed on the same bearing at lower loads ranging from 0-1 MPa (0-150 psi) by Al-Ghasem was tested, whereas the current work investigates effects in the load range between 1-2.2 MPa (150-320 psi). The bearing design parameters include: 4 pads with pad arc angle 72º and 50% pivot offset, pad axial length 0.0762 m (3 in), pad radial clearance 0.254 mm (0.010 in), bearing radial clearance 190.5 µm (0.0075 in), preload 0.25, and shaft nominal diameter of 0.11684 m (4.600 in). An important distinction between the two sets of tests is the difference in experimental bearing radial clearance, which for this case measured 208 µm (0.00082 in), and for Al-Ghasem’s was 165.1 µm (0.0065 in). The rotordynamic coefficients are determined experimentally using a test rig equipped with motion and load sensors. The rig is modeled using Newton’s laws, which is converted from the time to frequency domain using Fourier Transform to give complex dynamic stiffnesses. From the resulting complex dynamic stiffnesses the associated real and imaginary components are plotted as a function of excitation frequency and curve fitted via linear regression to give the rotordynamic coefficients. The primary objectives were to determine whether the real component of the complex dynamic stiffnesses could be better modeled with or without the mass coefficient and to contrast the rotordynamic coefficients with an analytical model. Only in the load range of 1 to 2.2 MPa were the unloaded direct mass coefficients near or at 0, which would allow for a [K][C] model to be used. The remaining real components are better represented with the mass term. The analytical model generally overpredicted the stiffness, damping and mass coefficients, especially for the direct components; the trends were generally consistent.
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Benali, Abdelkader. "Comportement dynamique des butées hydrodynamiques." Poitiers, 1988. http://www.theses.fr/1988POIT2011.

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Rodriguez, Colmenares Luis Emigdio. "Experimental frequency-dependent rotordynamic coefficients for a load-on-pad, high-speed, flexible-pivot tilting-pad bearing." Texas A&M University, 2003. http://hdl.handle.net/1969.1/138.

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This thesis provides experimental frequency dependent stiffness and damping coefficient results for a high-speed, lightly loaded, flexible-pivot tilting-pad bearing, with a load-on-pad configuration. Test conditions include four shaft speeds (6000, 9000, 13000 and 16000 rpm), and bearing unit loads from 172 kPa to 690 kPa. The results show that the bearing stiffness is a quadratic function of the frequency of vibration; hence their frequency dependency can be modeled by added-mass terms. The additional degrees of freedom introduced by the pads and the influence of the inertial forces generated in the fluid film account for this frequency dependency. The conventional frequency-dependent stiffness and damping model for tilting-pad bearings is extended with an added-mass matrix to account for the frequency dependency. This approach allows the description of the bearing dynamic characteristics with frequency-independent stiffness, damping and added-mass matrices. Experimental results are compared with predictions from the Reynolds equation and from a bulk-flow Navier-Stokes model. Both models produce good predictions of the stiffness and damping coefficients. However, results show that the bulk-flow model is more adequate for predicting the direct added-mass terms because it accounts for the fluid inertial forces. A bulk-flow solution of the Navier-Stokes equations that includes the effects of fluid inertia should be used to calculate the rotordynamic coefficients of a flexible-pivot tilting-bearing. Static performance measurement results are also detailed. Results include pad metal temperatures, eccentricity-ratios and attitude-angle as a function of bearing load, and estimated power losses.
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Al-Ghasem, Adnan Mahmoud. "Measurement of rotordynamic coefficients for a high-speed flexure pivot tilting-pad bearing(load between pad) configuration." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2415.

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This thesis presents the dynamic and static forced performance of a flexure-pivot tilting-pad bearing load between pad (LBP) configuration for different rotor speeds and bearing unit loadings. The bearing has the following design parameters: 4 pads with pad arc angle 72o and 50% pivot offset, pad axial length 0.0762 m (3 in), pad radial clearance 0.254 mm (0.010 in), bearing radial clearance 0.1905 mm (0.0075 in), preload 0.25 and shaft nominal diameter of 0.11684 m (4.600 in). The dynamic coefficients and the static performance parameters of the FPB have been compared with the theoretical predictions using the isothermal analysis from the rotordynamic software suite XLTRC2-XLTFPBrg. The bearing shows a small attitude angle, about 10o, which indicates small crosscoupling stiffnesses. The pad temperatures increase in the circumferential direction of rotation with speed and load. The pads maximum temperature was measured near the trailing edge. The dependency of the stiffness and damping coefficients on the excitation frequency has been studied. The frequency dependency in the dynamic coefficients was removed by introducing an added mass coefficient to the bearing model. The direct added mass coefficients were around 32 kg. The direct stiffness and damping coefficients increase with load, while increasing and decreasing with rotor speed, respectively. A small whirl frequency ratio (WFR) was found of about 0.15, and it decreases with load and increases with speed. A comparison between the dynamic stiffnesses using a Reynolds equation and the bulk-flow Navier-Stokes models with the experimental dynamic stiffnesses shows that the Reynolds model (even for laminar flows) is not adequate, and that the bulk-flow model should be used for rotordynamic coefficients prediction. The bulk-flow model in general predicts well the static performance parameters and the direct dynamic coefficients, and underpredicts the cross-coupled coefficients (overpredicts the stability).
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Harris, Joel Mark. "Static characteristics and rotordynamic coefficients of a four-pad tilting-pad journal bearing with ball-in-socket pivots in load-between-pad configuration." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3194.

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Rowan, D. "Design and development of a high-speed test facility and the measurement of the fluid film characteristics of journal bearings." Thesis, Cranfield University, 1998. http://dspace.lib.cranfield.ac.uk/handle/1826/11357.

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In the theoretical analysis of high speed rotor bearing systems, it is common to use four displacement and four velocity based coefficients, which characterise the behaviour of the lubricating fluid film. Although a great deal of work has been published establishing theoretical models of all types of hydrodynamic journal bearings, the large amount of experimental work has centred on relatively low speed conditions. This work presents a contribution to the experimental study of the static and dynamic characteristics of oil films in journal bearings used in high-speed rotating machinery. The main objectives of the work are: • To devise new experimental techniques for the measurement of dynamic coefficients suitable for use at high rotational speeds • To design, manufacture, assemble and commission a test facility to measure the static and dynamic characteristics of journal bearings at speeds up to 30000 rpm • To determine the static and dynamic characteristics of a 5 Pad Tilting Pad Journal Bearing Unit of 80 mm diameter at speeds up to 25 000 rpm using the said test facility. New techniques are particularly necessary for the measurement of velocity coefficients because these invoke the necessity of imposing a velocity on to the bearing housing and previous techniques have utilised synchronous motion of the bearing. Consequently a new experimental procedure for measuring the four velocity or damping coefficients of an oil film journal bearing from imposed dynamic "orbits" has been devised called the "double pulse" technique. All four velocity coefficients are derived from one imposed journal centre dynamic orbit and, therefore may be regarded as being obtained at the same time. The method requires the production of a "cross- over" point similar to that of a "figure of eight" shaped orbit and utilises the "cross-over" point therein. Coefficients are initially evaluated in a co-ordinate system, which is chosen to align with the designated parts of the measured orbit. Each coefficient is then evaluated from single values of instantaneous imposed force and resulting journal centre velocity. Coefficients are them converted into any other desired axes system. The result is a simpler experimental procedure, with reduced uncertainty compared to hitherto existing methods. The use of non-sinusoidal excitation of the oil film was explored, in the form of applying a step-pulse train load pattern to produce a cross-over pattern in the journal displacement ·orbit'. Experimental tests were completed on a tilting pad bearing at speeds up to 15 000 rpm inclusive. At speeds above this, the bearing exhibited a vibrational response, which precluded the accurate measurement of journal centre displacement.
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Harangozo, Andrew Vilmos. "An investigation into the effects of lubrication methods on the performance of the tilting-pad journal bearing." Thesis, Brunel University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257671.

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Sabnavis, Giridhar. "Test Results for Shaft Tracking Behavior of Pads in a Spherical Pivot Type Tilting Pad Journal Bearing." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/32574.

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Most tilting pad journal bearing dynamic characteristics estimation methodologies assume perfect shaft tracking by the pads. In other words, they neglect pivot friction. In case of pads having point or line contact that operate under most normal load conditions, the pad tilting is due to a rocking motion which is not greatly influenced by friction. Hence this simplifying assumption might be acceptable. Heavier loading conditions, such as those typically encountered in gearboxes, demand the use of spherical pivots to avoid pivot failure. The spherical pivot is very attractive for this reason, but the tilting motion is rather a sliding action that must occur in the precision ball socket. A valid concern exists for verifying the soundness of assumed shaft tracking by the pads of such bearings. A â fixed test bearing, floating shaftâ type of test rig previously built for determining the dynamic characteristics of bearings was accordingly modified to facilitate the testing of shaft tracking for a spherical pivot bearing. This thesis describes the modifications carried out on the rig. The special instrumentation and data acquisition systems implemented to observe the minute pad motion are also discussed. Some preliminary results of the tests are presented for various loading conditions. They show excellent shaft tracking by the pads. More detailed testing and analysis of data is required to fully understand the pad motion and tracking ability of the spherical pivot design.<br>Master of Science
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Book chapters on the topic "Tilting pad thrust bearing"

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Dadouche, Azzedine, Scan M. DeCamillo, and Michel Fillon. "Hydrodynamic Tilting-Pad Thrust Bearings." In Encyclopedia of Tribology. Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_49.

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Chatterton, Steven, Paolo Pennacchi, and Andrea Vania. "Multiphysics TEHD Model of a Tilting-Pad Thrust Bearing with Polymeric Layer." 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_78.

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Goel, Mohanish, S. Aravindan, K. V. Sreedharan, and U. Partha Sarathy. "Numerical Estimation of Performance Characteristics of Double-Acting Tilting Pad Thrust Bearing." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-97-7388-6_13.

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Chatterton, Steven, Paolo Pennacchi, and Andrea Vania. "Performances Degradation of Tilting-Pad Thrust Bearings Due to Electrical Pitting." 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_80.

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Adams, Maurice L. "Tilting-Pad Journal-Bearing Pad Flutter." In Bearings. CRC Press, 2018. http://dx.doi.org/10.1201/b22177-12.

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Adams, Maurice L. "Steam Turbine Tilting-Pad-Bearing Retrofit." In Bearings. CRC Press, 2018. http://dx.doi.org/10.1201/b22177-16.

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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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Frilli, Amedeo, Enrico Meli, Daniele Nocciolini, et al. "Tilting Pad Journal Bearing TEHD Analysis: An Innovative Model." In Mechanisms and Machine Science. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48375-7_43.

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Salazar, Jorge González, and Matías Reumay San-Martín. "Mechatronic Design of a New Fluid Pivot Journal Bearing." In Proceedings of the XV Ibero-American Congress of Mechanical Engineering. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-38563-6_64.

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AbstractThis work introduces a new sort of mechatronic hydrodynamic journal bearing for controlling vibrations in rotating machinery. This mechatronic design aims at improving an increasingly demanded bearing. The new mechatronic fluid pivot journal bearing is built upon a tilting pad journal bearing with a spherical pivot modified to inject pressurized oil into the pivot-pad gap. It is pursued that the bearing properties can be affected via controlling the pivot behaviour. The initial concept is presented followed by the design of each subsystem. An isothermal model is utilized. Results show a lab-size bearing ready for being experimentally validated. It is concluded that the proposed design poses a solution for common problems of hertzian contact based pivot hydrodynamic bearings.
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De P. Dourado, Arinan, Jefferson S. Barbosa, Leonardo Sicchieri, Aldemir A. Cavalini, and Valder Steffen. "Kriging Surrogate Model Dedicated to a Tilting-Pad Journal Bearing." In Mechanisms and Machine Science. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99262-4_25.

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Conference papers on the topic "Tilting pad thrust bearing"

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Schüler, Eckhard, and Stephan Faulhaber. "Preventing Tilting Pad Fluttering by Using Elastic Pad Fixation." In ASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/gt2024-125725.

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Abstract Tilting pad fluttering is a well-known phenomenon in journal and thrust bearings. It can occur on unloaded pads where the buildup of hydrodynamic pressure is not or not sufficiently achieved, which can be attributed to several causes. In severe forms of pad fluttering there is repetitive contact between the pad and the shaft. This can lead to bearing damages and, in the case of journal bearings, trigger subsynchronous rotor vibration with high amplitudes. There are various approaches to solving the problem, some of which relate to the elimination of existing pad fluttering. Proactive approaches are also described in the literature, but these are often associated with restrictions or certain disadvantages, meaning that these measures are not always applied in practice. To investigate a new approach, tilting pad fluttering was first caused and measured during experimental investigations on a conventional bearing. The bearing was then modified with the design solution “elastic pad fixation” which reliably prevented tilting pad fluttering without impairing the general properties and performance of the bearing.
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2

Cangioli, Filippo, Alex-Florian Cristea, Richard Livermore-Hardy, and Yujiao Tao. "The Effect of Pad Materials on the Limits of Operation for Tilting Pad Thrust Bearings." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-82655.

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Abstract The scope of this paper is to define the effect of pad materials on the limits of operation of tilting pad thrust bearings. In this paper, the Authors extend the work done by Martin on the limits of operation for steel/whitemetal bearings to other pad backing and lining materials widely used and accepted in the turbomachinery industry, such us, AlSn and PEEK for the lining and CuCr for the backing of the pad. This work has been achieved following a comprehensive experimental characterization of several different tilting pad thrust bearing sizes, with multiple pad backing/lining material options, over a wide range of speeds and loads. The Authors developed and validated a state-of-the-art thermo-elasto-hydrodynamic numerical model to predict the performance of tilting pad thrust bearings and define the limiting envelope. The numerical model couples the generalized Reynolds equation with a 3D heat transfer and structural-mechanics model of the pad, which allows to consider the effect of the pad material properties on the bearing performance. Experimental data along with numerical results reveal the effect that materials have on the limits of operation for a tilting pad thrust bearings for safe operating load and speed in hydrodynamic lubrication.
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3

Kim, Tae-Young, Dong-Jin Park, and Yong-Bok Lee. "The Static Characteristics of Bump Foil Thrust Bearing Considering Tilting Condition." In ASME/STLE 2009 International Joint Tribology Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/ijtc2009-15084.

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Air foil thrust bearings are the critical component available on high-efficiency turbomachinery which needs ability to endure the large axial force. Previous investigations about the static characteristics were obtained over the region of the thin air film using finite-difference method and the characteristics of the corrugated bump foil using finite-element method. Moreover, a recent study demonstrated that bearing performance is sensitive to tilting thrust pad condition. In this study, experimentally measured bearing static characteristics are compared with the numerical model of the foil thrust bearing considering tilting pad condition. Three geometrically different type foil bearings were tested to measure their load capacity under tilting conditions that have continuous angles from zero to 0.0002 rad. These data are presented for use i1n the development of more accurate foil thrust bearing numerical models.
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4

Rimpel, Aaron M., Giuseppe Vannini, and Jongsoo Kim. "A Rotordynamic, Thermal, and Thrust Load Performance Gas Bearing Test Rig and Test Results for Tilting Pad Journal Bearings and Spiral Groove Thrust Bearings." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57665.

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A high speed gas bearing test rig was developed to characterize rotordynamic, thermal, and thrust load performance of gas bearings being developed for an oil-free turboexpander. The radial bearings tested in this paper were tilting pad journal bearings with radial compliance features that allow the bearing bore to increase to accommodate shaft growth, and the thrust bearings were a spiral groove type with axial compliance features. The thrust bearing accounts for over 90% of the combined bearing power consumption, which has a cubic relationship with speed and increases with case pressure. Radial bearing circumferential pad temperature gradients increased approximately with speed to the fourth or fifth power, with slightly higher temperature rise for lower case pressure. Maximum steady state bearing pad temperatures increase with increasing speed for similar cooling mass flow rates; however, only the thrust bearing showed a significant increase in temperature with higher case pressure. The thrust bearings were stable at all speeds, but the load capacity was found to be lower than anticipated, apparently due to pad deformations caused by radial temperature gradients in the stator. More advanced modeling approaches have been proposed to better understand the thrust bearing thermal behavior and to improve the thrust bearing design. Finally, the radial bearings tested were demonstrated to be stable up to the design speed of 130 krpm, which represents the highest surface speed for tilting pad gas bearings tested in the literature.
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5

Kettleborough, C. F. "Starting Phenomena of Tilting Pad Bearings." In ASME 2001 Engineering Technology Conference on Energy. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/etce2001-17169.

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Abstract The starting of large thrust bearings in turbines is one of the most critical points in their operation as a pressure carrying oil film must be generated from initial conditions of load and zero relative velocity between the two surfaces. A force equal and opposite to the applied load must be produced before the surfaces separate. It is the purpose of this paper to discuss the origin and formation of this force. The results show that lapped and ground surfaces have inefficient lifting characteristics as compared with surfaces having irregularities on the surface of 1/20 mil and greater. In general, surface oil pockets have an important influence on the starting behavior of tilting pad bearings; without these oil pockets it is doubtful if the two bearing surfaces would part.
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6

Heinrichson, Niels, Ilmar Ferreira Santos, and Axel Fuerst. "The Influence of Injection Pockets on the Performance of Tilting-Pad Thrust Bearings: Part I — Theory." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95285.

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This is Part I of a two-part series of papers describing the effects of high pressure injection pockets on the operating conditions of tilting-pad thrust bearings. A numerical model based on the Reynolds equation is developed extending the three dimensional thermo-elasto-hydrodynamic (TEHD) analysis of tilting-pad thrust bearings to include the effects of high pressure injection and recesses in the bearing pad. The model is applied to the analysis of an existing bearing of large dimensions and the influence of the pocket is analyzed. It is shown that a shallow pocket positively influences the performance of the bearing as it has characteristics similar to those of a parallel step bearing.
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7

Ricci, R., S. Chatterton, P. Pennacchi, and A. Vania. "Multiphysics Modeling of a Tilting Pad Thrust Bearing: Comparison Between White Metal and Polymeric Layered Pads." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48171.

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Oil-film tilting pad thrust bearings are mainly used in supporting the high axial load of the turbine shaft in vertical hydroelectric units or smaller axial loads of turbo machines. The trend for these applications is to replace the white metal with a polymeric material layer such as PTFE or PEEK, improving the bearing performances and extending its operating conditions. This leads to a reduction of the bearing overall dimensions as a consequence of the load capacity increase. Apart the friction and the resistance to chemical attacks properties of the polymeric layer, the main cause on the improved performances of the bearing is the compliance of the pad layer. In particular the polymeric layer reduces the typical pad crowning allowing a more uniform pressure distribution over the pad and a reduction of its maximum value with respect to Babbitt metal pads. Therefore, the design of layered pad requires a deeper investigation such as thermoelastohydrodynamic (TEHD) analyses, including oilthermal effects and bearing thermal deformation. In the paper, the performance of Babbitt metal and polymeric layered pads of standard size offset-pivoted tilting pad thrust bearings of vertical axis units are compared using a multiphysics software able to manage simultaneously the mechanical, the thermal and the fluid problems. Layer and pad deformation, temperature and pressure distributions, and oil-film thickness have been analysed for different operating conditions. The model has been validated using experimental data available in literature.
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8

Koosha, Rasool, and Luis San Andrés. "A Model for Tilting Pad Thrust Bearings Operating With Reduced Flow Rate – Do Benefits Outweigh Risks?" In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-60396.

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Abstract The literature on tilting pad thrust bearings (TPTB) calls for flow reduction as an effective means to reduce drag power losses as well as oil pumping costs. However, the highest level of flow reduction a bearing can undergo while maintaining reliable operation is a key question that demands comprehensive analysis. This paper implements a model into an existing thermoelasto-hydrodynamic (TEHD) computational analysis tool to deliver load performance predictions for TPTBs operating with reduced flow rates. For bearings supplied with either a reduced flow or an over flow conditions, a sound model for the flow and thermal energy mixing in a feed groove determines the temperature of the lubricant entering a thrust pad. Under a reduced flow condition, the analysis reduces the effective arc length of a wetted pad until matching the available flow. Predicted discharge flow temperature rise and pad subsurface temperature rise from the present model match measurements in the archival literature for an eight-pad bearing supplied with 150% to 25% of the nominal flow rate, i.e., the minimum flow that fully lubricates the bearing pads. A supply flow above nominal rate increases the bearing drag power because the lubricant enters a pad at a lower temperature, and yet has little effect on a thrust pad peak temperature rise or its minimum film thickness. A reduced flow below nominal produces areas lubricant starvation zones, and thus the minimum film thickness substantially decreases while the film and pad’s surface temperature rapidly increase to produce significant thermal crowning of the pad surface. Compared to the bearing lubricated with a nominal rate, a starved flow bearing produces a larger axial stiffness and a lesser damping coefficient. A reduction in drag power with less lubricant supplied brings an immediate energy efficiency improvement to bearing operation. However, sustained long-term operation with overly warm pad temperatures could reduce the reliability of the mechanical element and its ultimate failure.
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9

Wang, X., Z. Zhang, and J. Pan. "A Transient Thermoelastohydrodynamic Analysis of a Tilting-Pad Thrust Bearing During Start-up." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63925.

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The aim of this work is to study the transient thermoelastohydrodynamic behavior of the tilting-pad thrust bearing during its start-up. The theoretical analysis of bearing performance is based on a three dimensional transient TEHD model. The effects of the running time and load on the bearing’s performance are studied. The results show that the above factors influence the performance of the bearing significantly.
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10

Srikanth, D. V. "Oil Film Angular Stiffness Determination in a Hydroelectric Tilting Pad Thrust Bearing." In STLE/ASME 2010 International Joint Tribology Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ijtc2010-41134.

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Tilting pad thrust bearings are designed to transfer high axial loads from rotating shafts to the static support structure. In the present paper, formulation of Reynolds’ equation for the bearing is done in two dimensions (planar). A finite difference method is used to convert the terms of the Reynolds’ equation in to a set of simultaneous linear algebraic equations. A solution procedure for finding value of the pressure in the oil film is described. Numerical integration of the pressure values gives the load distribution. Subsequently, the study of angular stiffness of the film is done by varying the value of the oil film thickness and calculating torques at three different film shapes 1, 2 &amp; 3 of the pad. The angular stiffness, differential displacement and load pertaining to the 3-2 pair are calculated for 0.5%–20% variation of ho. The results obtained show that the values of Kt* and K* converge asymptotically.
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