Thematische Bibliographien / Calculation of hydrostatic bearing

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Auswahl der wissenschaftlichen Literatur zum Thema „Calculation of hydrostatic bearing“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 1. Februar 2022

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Zeitschriftenartikel zum Thema "Calculation of hydrostatic bearing"

Liang, Peng, Changhou Lu und Fazhan Yang. „A fast computing approach concerning recess pressure“. Industrial Lubrication and Tribology 70, Nr. 1 (08.01.2018): 1–7. http://dx.doi.org/10.1108/ilt-12-2015-0196.

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Purpose This paper aims to provide a new method for fast calculation of the recess pressure for hydrostatic bearing compensated by orifice restrictor. Design/methodology/approach Three methods (new method, old method and finite difference method) are used to calculate recess pressure for hydrostatic bearing at different eccentricity ratios and radial clearances, and the results with the three methods are compared. Findings From the results, the conclusion is that the new method has a simple calculation process and a quick calculation speed. Originality/value The new method can be used to calculate the recess pressure of hydrostatic bearing with high precision and simple computing process.

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Huang, Long, Wen Li Ma und Jin Long Huang. „Calculation and Simulation Azimuth Hydrostatic Thrust Bearing of a Large Alt-Azimuth Telescope“. Applied Mechanics and Materials 364 (August 2013): 28–32. http://dx.doi.org/10.4028/www.scientific.net/amm.364.28.

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The use of hydrostatic bearing for support of telescope offers a number of potential performance advantages, but the structure parameter of bearing is the main factor which influence the bearing. The temperature rise of bearing is also important for the stiffnees of the telescope mount.In addition to the known benefit of mount stiffness and tracking accuracy from exceedingly low friction, the hydrostatic bearing provides a wide range of geometric possibilities for large telescopes [1].This paper analyzes various familiar hydrostatic bearing for the azimuth and elevation axes of telescope.Theoretical calculation and simulation show that the performance of bearing meets telescope’s design requirements.The principle and process of this work and Finite Element Analysis (FEA) are introduced in detail. According to the CFX result, the structure parameter and performance of bearing ,temperature field and pressure distribution have obtained.

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Zhang, Yan Qin, Xiao Dong Yu, Xiao Dong Yang, Gui Tao Sun, Xiao Yang Yu und Zhi Min Shi. „Viscosity Influence Research on Load Capacity of Heavy Hydrostatic Bearing“. Key Engineering Materials 450 (November 2010): 63–66. http://dx.doi.org/10.4028/www.scientific.net/kem.450.63.

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Lubricant viscosity is one of the key parameters in hydrostatic bearing research. In order to solve the load capacity of hydrostatic bearing in the heavy equipment, viscosity-temperature equation of lubricant film is established, and the viscosity-temperature curve is fitted by B-Spline curve. Finite volume method is used on numerical simulation of pressure field of heavy hydrostatic bearing in constant and variable viscosity respectively and in different rotational velocity, whereafter, viscosity influence on load capacity of heavy hydrostatic bearing is discussed. The results show that, viscosity impose a minor influence on cavity pressure of hydrostatic bearing when rational velocity is low; whereas, when rational velocity is high, especially to the heavy hydrostatic bearing which with high liner velocity influence of viscosity changing must be taken into account in calculation. Numerical simulation results reflect the pressure distributing state of bearing veritably; furthermore, these provide theoretical basis for hydrostatic bearing design and lectotype in practical application.

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Zhang, Yan Qin, Rui Li, Chun Xi Dai, Jun Peng Shao, Xiao Dong Yang und Gui Tao Sun. „Temperature Field of Hydrostatic Supporting Disk in Different Viscosity and Rotational Speed“. Applied Mechanics and Materials 274 (Januar 2013): 124–27. http://dx.doi.org/10.4028/www.scientific.net/amm.274.124.

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With heavy hydrostatic bearing as the research object, establish oil film viscosity-temperature equation. Adopt finite volume method, respectively calculates the oil film temperature field under different rotate velocity in Invariant viscosity and variable viscosity, revealing the oil film temperature arise influence rule of hydrostatic bearing on the viscosity and rotate velocity. The results show that the viscosity and rotate velocity have a great influence on the hydrostatic bearing oil film temperature rise, but the effect regularity varied. The calculated results that provide a theoretical basis for the hydrostatic bearing structure design and bearing deformation calculation, and have very important significance on improve the reliability and precision of the whole machine tools.

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Zhang, Yan Qin, Xiao Dong Yang, Hong Mei Li, Hui Jiang, Xiao Yang Yu und Zhi Min Shi. „Research on Influence of Cavity Depth on Load Capacity of Heavy Hydrostatic Bearing in Variable Viscosity Condition“. Advanced Materials Research 129-131 (August 2010): 1181–85. http://dx.doi.org/10.4028/www.scientific.net/amr.129-131.1181.

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Owing to setting viscosity of lubrication oil as a constant value will lead errors in hydrostatic bearing calculation, the influence of cavity depth on load capacity of heavy static bearing is analyzed in variable viscosity condition. Firstly, viscosity-temperature equations of oil film are established; secondly, viscosity-temperature curve is fitted by B-Spline; finally, using finite volume method, hydrostatic pressure field and dynamic pressure field of heavy hydrostatic bearing is calculated with different cavity depth at the same velocity, and influence of cavity depth on load capacity is revealed. The results show that, were the cavity depth shallow enough(≤2mm), hydrostatic pressure and dynamic pressure of cavity would decline rapidly with the cavity depth increasing; whereas, were cavity deep enough(≥2mm), hydrostatic pressure and dynamic pressure of cavity would change little with the cavity depth extending. This numerical simulation reflects real distribution of bearing pressure appropriately, and provides a theoretical basis for hydrostatic bearing design and lectotype.

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Yang, Xiao Dong, Jun Peng Shao, Xiao Qiu Xu, Yun Fei Wang, Chao Yin und Hui Jiang. „Research on Velocity Influence on Thermal Deformation Field of Heavy Hydrostatic Thrust Bearing“. Advanced Materials Research 129-131 (August 2010): 968–72. http://dx.doi.org/10.4028/www.scientific.net/amr.129-131.968.

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According to the structure of workbench and base of heavy hydrostatic bearing which is applied in heavy equipment, thermal deformation equations of the structure are deduced and boundary conditions for numerical simulation are established based on thermal elasticity theory. Then thermal deformation of hydrostatic bearing without load is calculated at different velocity. The results indicate that: temperature and velocity impacts a significant influence on thermal deformation of hydrostatic bearing. Thermal deformation increases as the velocity increases; workbench up-warps severely, oil-pad inclines towards outside to a certain extent, which results in the lubrication clearance emerges as wedge-shape deformation. The conclusions from thermal deformation calculation could provide theoretical basis for structure design of hydrostatic bearing and ravel out the thermal deformation problem.

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Kodnyanko, Vladimir, und Andrey Kurzakov. „Static characteristics of a hydrostatic thrust bearing with a membrane displacement compensator“. FME Transactions 49, Nr. 3 (2021): 764–68. http://dx.doi.org/10.5937/fme2103764k.

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The article discusses the design and also presents a mathematical model and method for calculation of static characteristics of a hydrostatic thrust bearing with a membrane-type displacement compensator. Formulae for calculation of compliance and load characteristics of the bearing are also presented, as well as deformation and compliance of the membrane at which zero compliance of the bearing is guaranteed.

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Wang, Shi Gang, Zi Jian Qiu und Dong Sheng Li. „Study on Capacity of Vertical Lathe for Heavy Hydrostatic Bearing“. Materials Science Forum 800-801 (Juli 2014): 559–63. http://dx.doi.org/10.4028/www.scientific.net/msf.800-801.559.

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For DVT500 vertical lathe of the carrying capacity of heavy hydrostatic bearing problem, Through the simplification of the geometric model of a single oil pad to derive the effective bearing area of a single oil pad, then establish its mathematical model, for the following to prepare for the simulation of heavy hydrostatic bearing, and through the simulation of heavy hydrostatic bearing, get the input under the condition of unchanged, with the constant improvement of the speed, the change of heavy hydrostatic bearing pressure field. Results show that the feed quantity under the condition of unchanged, with the constant improvement of the speed, start from the center of the biggest oil cavity pressure peak around gradually diminishing, isobar and high oil and shape of cavity shape basically the same. Numerical calculation results reflect the inside of the bearing pressure distribution, the simulation results for the engineering practice the bearing oil cavity structure optimization design provides a theoretical basis.

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San Andres, Luis. „The Effect of Journal Misalignment on the Operation of a Turbulent Flow Hydrostatic Bearing“. Journal of Tribology 115, Nr. 3 (01.07.1993): 355–63. http://dx.doi.org/10.1115/1.2921643.

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An analysis for calculation of the dynamic force and moment response in turbulent flow, orifice compensated hydrostatic journal bearings is presented. The fully developed flow of a barotropic liquid is described by variable properties, bulk-flow equations and local turbulent friction factors based on bearing surface condition. Bearing load and moments and, dynamic force and moment coefficients are calculated for perturbations in journal center displacements and misaligned journal axis rotations. Numerical results for the effect of static misalignment angles in the plane of the eccentricity vector are presented for a water lubricated hydrostatic bearing. The predictions show that journal axis misalignment causes a reduction in load capacity due to loss in film thickness, increases the flow rate and produces significant restoring moments (couples). Force and moment coefficients due to dynamic journal axis rotations are also discussed.

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Zhang, Yan Qin, Xiao Qiu Xu, Xiao Dong Yang, Hong Mei Li, Hui Jiang, Xiao Yang Yu und Zhi Min Shi. „Analysis on Influence of Oil Film Thickness on Temperature Field of Heavy Hydrostatic Bearing in Variable Viscosity Condition“. Advanced Materials Research 239-242 (Mai 2011): 1418–21. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.1418.

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According to the problem of the influence of oil film thickness on temperature rise for heavy hydrostatic thrust bearing during operation， build viscosity-temperature equation of lubricating oil film and mathematics model of oil film temperature rise of heavy hydrostatic bearing with multiple oil pads, simulate the temperature field of hydrostatic bearing with sector cavity under various oil film thickness using FVM(finite volume method), and reveal the influence law of oil film thickness of temperature rise for hydrostatic bearing. The results show that temperature distribution of hydrostatic bearing is much the same under various oil film thicknesses, but the influence of oil film thickness of temperature rise for hydrostatic bearing is greater. The results of numerical calculations actually response flow state inside hydrostatic bearing ，offer theoretical foundation for the design of hydrostatic bearing in engineering practice, and have important significance in improving operation stability of NC machine.

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Dissertationen zum Thema "Calculation of hydrostatic bearing"

Foltýn, Jan. „Konstrukce hydrostatického uložení divadelní točny“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444275.

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This thesis deals with the issue of hydrostatic bearings. The aim was to design a test rig for an axial hydrostatic bearing. The axial hydrostatic bearing was calculated and designed with respect to the function of the tester. The construction of the test equipment was further supported by calculations of the main parts together with FEM analyses. The design was also accompanied by an introduction to the hydraulic parts of the hydrostatic bearing, which took place in consultation with Bosch Rexroth. The aim of the work, the design of a test device in a scale of 1:10, was completed. The following results from hydrostatic bearing tests will allow the introduction of new procedures in the production of turntables mounted on a hydrostatic bearing. Examination of operating conditions and permissible assembly inaccuracies will make it possible to reduce the production requirements for bearing mounting.

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Wong, Anthony Raymond. „Design of a low cost hydrostatic bearing“. Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74951.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 77).
This thesis presents the design and manufacturing method for a new surface self compensating hydrostatic bearing. A lumped resistance model was used to analyze the performance of the bearing and provide guidance on laying out the bearing features. One arrangement of bearing features was cut into a flat sheet of ultra high molecular weight polyethylene which was then formed into a cylindrical shape. The shaped plastic was adhered to an aluminum housing then connected to a pump. Experimental data shows that the lumped resistance model provides a good estimation of the bearing performance. After validating the analytical model, sensitivity studies were conducted to predict changes in the bearing performance due to manufacturing variances. The results of the model indicate the design is extremely robust.
by Anthony Raymond Wong.
S.M.

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Ashman, D. „High-speed performance of a hydrostatic thrust bearing“. Thesis, University of Wolverhampton, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378961.

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The programme of research reported in this dissertation was undertaken with the aim of improving the high-speed performance of a multi-recessed hydrostatic thrust bearing. A theoretical analysis of the quasi-static behaviour and isothermal frictional power consumption is developed using the basic equations governing viscous fluid flow. The effects of high peripheral speeds are discussed and how recently proposed bearing modifications, in the form of grooved lands and changes in recess geometry, are used to reduce the frictional power consumption, lower operating temperatures, and reduce unwanted hydrodynamic and fluid inertia induced pressure variations. The steady state temperature distribution, frictional power consumption and operating clearance when one bearing member is rotating, and dynamic loading performance are predicted by several specially developed Fortran computer programs. One section concentrates on the design, development and instrumentation of an experimental multi-recessed hydrostatic thrust bearing, which had a facility for changing the pocket geometry using recess inserts. The bearing plate. which had an outside diameter of 200 mm, was operated at rotational speeds between 1000-5000 rpm to give peripheral speeds between 10.5 - 52.5 m/s. A chapter deals with an experimental investigation of the high-speed performance of a multi-recessed hydrostatic thrust bearing, principally the quasi-static loading and flow rate characteristics, temperature and pressure distributions and frictional power consumption. Furthermore, the dynamic response of the test bearing arrangement was investigated experimentally for a range of excitation frequencies between 0- 70 Hz- Finally, the theoretical predictions of characteristics such as quasi-static loading and flow rate, steady state operating conditions and dynamic response are compared with the corresponding experimental results.

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Mass, Igor, Andreas Hoppermann und Hubertus Murrenhoff. „Control concept for a grease lubricated hydrostatic bearing“. Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71086.

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In industrial practice greases are mainly used as lubricants in hydrodynamic plain bearings and roller bearings. The use in hydrostatic bearings is avoided due to the difficult controllability. One reason is the complex non-Newtonian flow behavior of greases. The motivation for this paper is the use of greases to increase the efficiency of hydrostatic bearings. The assumption is that the so-called yield stress of consistent greases can lead to self-sealing behavior in the bearing under stationary operation conditions. Assuming a volume-flow-free operation of the bearing, a concept for the active control of the sealing gap height and thus the bearing stiffness was developed. The concept idea is the use of a second medium with Newtonian characteristic for pressure transfer. The grease and the pressure control fluid are structurally separated. The grease is induced in the shortest possible way into the bearing pocket to keep the pressure losses as low as possible. The results of test bench investigations indicate the feasibility of a gap height control with very high bearing stiffness under use of highly consistent greases and initiate further investigation on non-stationary operation.

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Rothenhöfer, Gerald S. (Gerald Sven). „Design, dynamic modeling, simulation and feedback control of hydrostatic bearing“. Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39888.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.
Includes bibliographical references (p. 113).
A hydrostatic bearing carriage (Hydrocline) that uses an open face linear motor to drive the carriage as well as to preload the hydrostatic bearings has been developed by Professor Alexander Slocum and Gerald Rothenhöfer of the Massachusetts Institute of Technology's Mechanical Engineering Department. The Hydrocline is made to cope with the increasing requirements for accuracy in silicon wafer grinding machines. The prototype was built of aluminum oxide ceramic due to its high stiffness-to-weight ratio, low thermal expansion and corrosion resistance. In order to keep the cost of manufacturing as low as possible, a modular design that uses micron-level precision ceramic beams was chosen. Initial testing of the prototype carriage indicates that it has the following performance specifications: a vertical load capacity exceeding 5000N (theoretical limit at 12000N, max. pressure of pumps); a carriage pitch error of 0.7arc seconds; a yaw error of 0.7arc seconds; a roll error of +/- 0.6arcsec a vertical straightness at the center of the carriage of +/-0.75microns; and a vertical stiffness of the carriage of 900N per micron (load range from 0 to 1000N).
(cont.) A dynamic model of the hydrostatic bearing and fluid supply system has been developed and accurately predicts the performance of the Hydrocline. The model has been used to simulate a feedback control loop that adjusts the bearing supply flow such that changes in load can be compensated and theoretically infinite stiffness can be reached. In first experiments on a specially designed test setup the measured static stiffness of the single pocket test bearing could be increased by a factor 8 (load range 45 to 270N). The dynamic stiffness of the bearing could be increased by a factor of 2.5.
by Gerald S. Rothenhöfer.
S.M.

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Zulkefli, Zamir Aimaduddin Bin. „MITIGATION OF GEAR MESH-FREQUENCY VIBRATIONS UTILIZING A HYDROSTATIC BEARING“. Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1354902949.

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Sawicki, Jerezy Teodor. „Experimental and theoretical determination of hydrostatic/hybrid journal bearing rotordynamic coefficients“. Case Western Reserve University School of Graduate Studies / OhioLINK, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=case1056560686.

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Almond, R. J. „The development of a porous ceramic water hydrostatic bearing for ultra high precision applications“. Thesis, Cranfield University, 1999. http://dspace.lib.cranfield.ac.uk/handle/1826/10572.

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The principal objective of this research was to produce a series of extremely stiff and thermally stable porous ceramic bearings, and to expand the performance envelope of fluid film technology beyond that currently achievable with conventional oil hydrostatic bearings. The driving force for these developments came from recent advances in ultra- precision and high speed machining, which have placed severe demands on the accuracy and performance of spindle and guide-way bearing systems. A critical part of this research was to develop a material processing methodology, which enabled porous ceramic bearing structures to be manufactured with consistent permeability coefficients. Such control of the material microstructure was necessary in order to produce a useful and predetermined level of performance. The bearings were fabricated using bimodal blends of alumina powder, and vibratory packing into graphite tooling was used to achieve uniform green densities. Following this, the tooling was transferred directly to a hot isostatic press for capsule free high pressure sintering. The influence of temperature and pressure on sintering and permeability was studied, and optimum processing conditions were established. The operation of the water lubricated porous hydrostatic bearing was investigated on a highly instrumented journal test rig. This research has resulted in a bearing with greater stiffness, higher operating speed and lower power consumption than conventional oil hydrostatic technology could achieve. Significant savings were also shown regarding the energy required to drive the spindle assembly, with a reduction in both rotating frictional power and lubricant pumping power consumption.

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Mertz, David Hunter. „Lift-off performance in flexure pivot pad and hybrid bearings“. [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3197.

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Kim, Paul Y. „A new method for the critical speed calculation of rotor-bearing systems“. Thesis, University of Ottawa (Canada), 1987. http://hdl.handle.net/10393/5135.

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Bücher zum Thema "Calculation of hydrostatic bearing"

Ashman, David. High-speed performance of a hydrostatic thrust bearing. Wolverhampton: The Polytechnic, Wolverhampton, 1987.

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Zaretsky, Erwin V. Bearing elastohydrodynamic lubrication: A complex calculation made simple. [Washington, D.C: National Aeronautics and Space Administration, 1990.

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Hendry, A. W. The calculation of eccentricities in load bearing walls. Windsor: Brick Development Association, 1986.

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Finn, William Edward. Non-Newtonian temperature and pressure effects of a powder lubricant slurry in a rotating hydrostatic step bearing. Springfield, Va: Available from the National Technical Information Service, 1993.

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SetkovSerbin, Evgeniy. Building structures. Calculation and design. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1030129.

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The textbook outlines the basics of designing and calculating the simplest and most widely used load-bearing structures in construction practice. Meets the requirements of the federal state educational standards of secondary vocational education of the latest generation. It is intended for students and teachers of construction colleges and technical schools, as well as other secondary vocational educational institutions that train specialists in construction specialties, primarily in the specialty 08.02.01 "Construction and operation of buildings and structures" with all its specializations of the basic level. It may be of interest to students of higher education, where the discipline "Building structures" is included in the curriculum, but is not a profile. It can be useful for construction technicians engaged in production activities or design work in the field of new construction or reconstruction in the housing and communal complex, especially in small businesses.

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Ramberger, Günter. Structural bearings and expansion joints for bridges. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2002. http://dx.doi.org/10.2749/sed006.

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Bridge superstructures have to be designed to permit thermal and live load strains to occur without unintended restraints. Bridge bearings have to transfer forces from the superstructure to the substructure, allowing all movements in directions defined by the designer. The two functions -transfer the loads and allow movements only in the required directions for a long service time with little maintenance - are not so easy to fulfil. Different bearings for different purposes and requirements have been developed so, that the bridge designer can choose the most suitable bearing. By the movement of a bridge, gaps are necessary between superstructure and substructure. Expansion joints fill the gaps, allowing traffic loads tobe carried and allowing all expected displacements with low resistance. Expansion joints should provide a smooth transition, avoid noise emission as far as possible and withstand all mechanical actions and chemical attacks (de-icing) for a long time. A simple exchange of all wearing parts and of the entire expansion joint should be possible. The present volume provides a comprehensive survey of arrangement, construction and installation of bearings and expansion joints for bridges including calculation of bearing reactions and movements, analysis and design, inspection and maintenance. A long list of references deals with the subjects but also with aspects in the vicinity of bearings and expansion joints. This book is aimed at both students and practising engineers, working in the field of bridge design, construction, analysis, inspection, maintenance and repair.

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Hydrostatic Aerostatic And Hybrid Bearing Design. Butterworth-Heinemann, 2012.

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Hydrostatic, Aerostatic and Hybrid Bearing Design. Elsevier, 2012. http://dx.doi.org/10.1016/c2011-0-07331-3.

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P, Hannum Ned, Meyer Scott D und United States. National Aeronautics and Space Administration., Hrsg. Evaluation of a hybrid hydrostatic bearing for cryogenic turbopump application. [Washington, DC]: National Aeronautics and Space Administration, 1986.

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Dussaule, Jean-Claude, Martin Flamant und Christos Chatziantoniou. Function of the normal glomerulus. Herausgegeben von Neil Turner. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199592548.003.0044_update_001.

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Glomerular filtration, the first step leading to the formation of primitive urine, is a passive phenomenon. The composition of this primitive urine is the consequence of the ultrafiltration of plasma depending on renal blood flow, on hydrostatic pressure of glomerular capillary, and on glomerular coefficient of ultrafiltration. Glomerular filtration rate (GFR) can be precisely measured by the calculation of the clearance of freely filtrated exogenous substances that are neither metabolized nor reabsorbed nor secreted by tubules: its mean value is 125 mL/min/1.73 m² in men and 110 mL/min/1.73 m² in women, which represents 20% of renal blood flow. In clinical practice, estimates of GFR are obtained by the measurement of creatininaemia followed by the application of various equations (MDRD or CKD-EPI) and more recently by the measurement of plasmatic C-cystatin. Under physiological conditions, GFR is a stable parameter that is regulated by the intrinsic vascular and tubular autoregulation, by the balance between paracrine and endocrine agents acting as vasoconstrictors and vasodilators, and by the effects of renal sympathetic nerves. The mechanisms controlling GFR regulation are complex. This is due to the variety of vasoactive agents and their targets, and multiple interactions between them. Nevertheless, the relative stability of GFR during important variations of systemic haemodynamics and volaemia is due to three major operating mechanisms: autoregulation of the afferent arteriolar resistance, local synthesis and action of angiotensin II, and the sensitivity of renal resistance vessels to respond to NO release.

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Buchteile zum Thema "Calculation of hydrostatic bearing"

Aoyama, Tojiro. „Hydrostatic Bearing“. In CIRP Encyclopedia of Production Engineering, 1–6. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-642-35950-7_6530-4.

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Aoyama, Tojiro. „Hydrostatic Bearing“. In CIRP Encyclopedia of Production Engineering, 682–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-20617-7_6530.

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Aoyama, Tojiro. „Hydrostatic Bearing“. In CIRP Encyclopedia of Production Engineering, 936–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-53120-4_6530.

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Rehman, Waheed Ur, Jiang Guiyun, Nadeem Iqbal, Luo Yuanxin, Wang Yongqin, Shafiq Ur Rehman, Shamsa Bibi, Farrukh Saleem, Irfan Azhar und Muhammad Shoaib. „Intelligent Servo Feedback Control for Hydrostatic Journal Bearing“. In Intelligent Computing and Internet of Things, 352–64. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2384-3_33.

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Shu, Xu. „Analytical Investigation on Static Hydrostatic Bearing by Fluent“. In Lecture Notes in Electrical Engineering, 497–504. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25905-0_64.

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Patil, Sumit J., Abhishek N. Khairnar, Vikas M. Phalle und Praveen K. Limaye. „Simulation of Self Compensating Hydrostatic Bearing Using Finite Element Analysis“. In Developments and Novel Approaches in Nonlinear Solid Body Mechanics, 377–88. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-50460-1_21.

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Soni, Sandeep, und Dnyaneshwar V. Kushare. „Static and Dynamic Characteristics of Two-Lobe Hydrostatic Journal Bearing“. In Lecture Notes in Mechanical Engineering, 685–93. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6469-3_63.

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Skyba, Rudolf, Slavomír Hrček, Lukáš Smetanka und Maroš Majchrák. „Creation of Calculation 3D Model of Slewing Bearing“. In Current Methods of Construction Design, 149–57. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-33146-7_18.

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Zhan, Shuo, Wei Pan, Yixin Zhang und Changhou Lu. „Modeling and Parameter Identification for Active Lubricated Hydrostatic Bearing-Rotor System“. In Mechanical Engineering and Materials, 197–207. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-68303-0_16.

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Ashman, D., E. W. Parker und A. Cowley. „Dynamic Performance of a Hydrostatic Thrust Bearing with An ERFS and Grooved Lands“. In Condition Monitoring and Diagnostic Engineering Management, 14–19. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0431-6_3.

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Konferenzberichte zum Thema "Calculation of hydrostatic bearing"

Johansen, Per, Daniel B. Roemer, Torben O. Andersen und Henrik C. Pedersen. „Influence of the Lubricant Thermo-Piezo-Viscous Property on Hydrostatic Bearings in Oil Hydraulics“. In 9th FPNI Ph.D. Symposium on Fluid Power. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fpni2016-1551.

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In fluid power machinery hydrostatic bearings are frequently used, and a first approximation approach to design is determination of a balance ratio by analytical calculation of the hydrostatic pressure force. Usually this is performed assuming that the thermo-piezo-viscous property can be neglected. However, in applications as piston machines, where pressure in many cases exceeds 200 Bar, such assumption leads to considerable error in the balance ratio prediction, due to the piezo-viscous property of the lubricant. Furthermore, the thermo-viscosity relation also has a significant influence, which adds to the discrepancy of such simple design approach. In this paper the hydrostatic pressure force calculation is reviewed in terms of thermohydrodynamic (THD) lubrication theory, and simple analytical approximations of the hydrostatic pressure force, incorporating the piezo-viscous and thermo-viscous property of the lubricant, are presented. In order to investigate validity of the approximations a numerical THD model is developed. A comparison study of the numerical and analytical predictions is performed in order to validate the simple design approach. In addition, the assumptions that form the basis of these analytical approximations are explored in order to clarify the limits of application. In conclusion, it is found that the spatial gradient of the thermal field on the bearing surface is the significant factor in the thermo-viscous effect on the hydrostatic pressure profile, which leads to the conclusion that design engineers need to understand the thermodynamics of hydrostatic bearings, when using the conventional simple analytical approach, neglecting thermo-piezo-viscosity, in hydrostatic pressure force calculations.

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Guo, Zenglin, Toshio Hirano und R. Gordon Kirk. „Application of CFD Analysis for Rotating Machinery: Part 1 — Hydrodynamic, Hydrostatic Bearings and Squeeze Film Damper“. In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38931.

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The traditional method for bearing and damper analysis usually involves a development of rather complicated numerical calculation programs that may just focus on a simplified and specific physical model. The application of the general CFD codes may make this analysis available and effective where complex flow geometries are involved or when more detailed solutions are needed. In this study, CFX-TASCflow is employed to simulate various fixed geometry fluid-film bearing and damper designs. Some of the capabilities in CFX-TASCflow are applied to simulate the pressure field and calculate the static and dynamic characteristics of hydrodynamic, hydrostatic and hybrid bearings as well as squeeze film dampers. The comparison between the CFD analysis and current computer programs used in industry has been made. The results show reasonable agreement in general. Some of possible reasons for the differences are discussed. It leaves room for further investigation and improvement on the methods of computation.

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Buchhorn, Nico, Sebastian Kukla, Beate Bender und Marc Neumann. „Tilting-Pad Journal Bearing in Hybrid Operation: A Numerical and Experimental Investigation“. In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75256.

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Large turbine bearings are usually equipped with hydrostatic jacking mechanisms to separate bearing and shaft during transient start-stop procedures. They are turned off once hydrodynamic operation is reached. In some cases, under severe operating conditions, the hydrostatic oil supply is kept running although the rotor already runs in full speed. The supplied amount of jacking oil is very small compared to the regular oil supply. However, experimental data of a large tilting-pad bearing shows that this hybrid operation has a considerable impact on the load carrying capacity in terms of lower pad temperature and larger film thickness. In this paper, a theoretical investigation to analyse the effect of increased load carrying capacity of a large tilting-pad journal bearing in hybrid operation is presented. The increase is driven by three different aspects: 1) hydrostatic pressure component, 2) increase in lubricant viscosity due to the injection of cold oil, 3) decrease of temperature gradients and thus thermal pad deformation. Subject of the approach is a ø500 mm five-pad, rocker-pivot tilting-pad journal bearing in flooded lubrication mode. The experiments are carried out on the Bochum test rig for large turbine bearings. The theoretical analyses are performed with a simulation code solving the Reynolds and energy equations for the oil film and calculating the thermomechanical pad deformations simultaneously. By considering each of the three above aspects separately and in combination, their share of load increase can be assessed individually. Contrary to expectations, the results indicate that the increase is not mostly based on the hydrostatic pressure component. Instead, the advantageously decreased pad deformations make the largest contribution to the increased load carrying capacity while the alteration in viscosity shows the least impact.

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Shin, J. H., H. E. Kim und K. W. Kim. „Lubrication Analysis of the Thrust Bearing in the Valve Plate of a Swash-Plate Type Axial Piston“. In ASME/STLE 2011 International Joint Tribology Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ijtc2011-61070.

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This application study of a swash-plate type axial piston pump was concerned about the hydrostatic lubrication characteristics of cylinder barrel and valve plate which are main rotating body and its opposite moving part respectively. A computer simulation was implemented to assess thrust bearing and mechanical sealing functions of the fluid film between cylinder barrel and valve plate. A new algorithm was developed to facilitate simultaneous calculations of dynamic cylinder pressure, 3 degree-of-freedom barrel motions considering inertia effect, and fluid film pressure assuming full fluid film lubrication regime. Using the simulation tool, force and moment balancing of cylinder barrel which is a key issue of piston pump design was analyzed. Time dependent fluid film pressure and thickness distributions for several given balance ratios were calculated. This analysis helps to decide appropriate balance ratio in the valve and cylinder barrel. Oil leakage flow and friction torque in the fluid film between cylinder barrel and valve plate were calculated as well and discussed in the viewpoint of energy loss. The results show that film thickness in plain surface is not high enough to bear the barrel and reduce power loss and that surface waviness which exists in actual sliding surfaces can have a positive effect on it. This simulation tool could also predict time dependent barrel motions due to simultaneous calculation algorithm. It has been known that cylinder barrel rotates with oscillation. Therefore average clearance, tilt angle, and azimuth angle were calculated for each time step and the results were discussed.

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Liebmann, Dennis, Volker Lagemann und Michael Bargende. „Friction Calculations and Validation Measures on an External Component Test Bench of the Piston Pin Bearing under the Influence of Greater Elastic Deformation Caused by a Hydrostatic Bearing“. In 15th International Conference on Engines & Vehicles. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2021. http://dx.doi.org/10.4271/2021-24-0001.

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Nakao, Yohichi, Toshiaki Sano, Midori Nagashima und Kenji Suzuki. „Development and Modeling of Water Driven Stage“. In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64424.

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The water driven stage that is developed for ultra-precision machine tools is presented. The stage is designed for the diamond turning of small precise parts, such as various small lenses or mirrors. The moving table of the water driven stage is supported by water hydrostatic bearings. The stage is driven by the water hydraulic piston-cylinder mechanism that is designed inside the table. A feature of the stage is that the driving force by the piston-cylinder mechanism acts on the center of gravity of the moving table, minimizing undesirable pitching and yawing motions. In order to investigate the characteristics of the stage, a mathematical model of the water driven stage is derived. Performances of the water driven stage are examined through experiments and calculations. The present study verifies that the feed motion needed for the diamond turning operations can be obtained by supplying few flow rate of water, several tens milliliters per minutes. Stiffness of the water hydrostatic bearing is also experimentally investigated. The result shows that stiffness is approximately 330 N/μm if the supply pressure was 0.5 MPa.

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Helene, Mathieu, Mihai Arghir und Jean Frene. „Combined Navier-Stokes and Bulk-Flow Analysis of Hybrid Bearings: Radial and Angled Injection“. In ASME/STLE 2004 International Joint Tribology Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/trib2004-64027.

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The present work deals with the Navier-Stokes and bulk-flow analysis of hybrid bearings intended for use in aerospace applications. These bearings are expected to work at high rotational speeds and high feeding pressures. In such a case, the pressure in the shallow pockets of the bearing is no longer constant and is influenced by hydrostatic and hydrodynamic effects. It has been shown in the literature that the recess pressure pattern can have an important influence on the dynamic characteristics of the bearing. The present work investigates the pressure field in the recess of centered hybrid bearings with radial and angled injection by using a numerical Navier Stokes analysis. The recess pressure pattern is then subsequently characterized by combining these results with some parametric descriptions. For calculating the dynamic characteristics of the bearing, the parametric pressure pattern is then injected into a bulk-flow model that is an alternative analysis of the one introduced by San Andre´s [3, 4]. In order to evaluate the validity of the bulk-flow code, the numerical predictions are compared with experimental data taken from the literature for radial and angled injection. The favorable effect of the counter-rotating angled injection is then explained by using the velocity field issued from the Navier Stokes analysis and the pressure field given by the bulk-flow model.

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Arghir, Mihai, Mathieu He´le`ne und Jean Frene. „Analysis of Tangential-Against-Rotation Injection Lomakin Bearings“. In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38411.

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This work presents a thin film flow model for analyzing the static and dynamic characteristics of centered, eccentric or misaligned tangential-against-rotation injection Lomakin bearings. The Lomakin bearing is a recent device intended for use in modern turbomachinery and having characteristics similar to hybrid bearings. It can be described as an ensemble of two opposing straight annular seals separated by a circumferential feeding groove. The fluid is supplied to the groove via orifice restrictors. Their tangential inclination generates an against-rotation circumferential flow in the groove that further penetrates into the thin film. This effect, known from annular seals as the pre-rotation speed, improves the dynamic characteristics of the bearing. The zero and first order analyses are carried out by recognizing the crucial importance of taking into account the interaction between the flow in the thin film lands, the circumferential groove and the supply orifices. Due to the high Reynolds number regime, the land flow is governed by the two dimensional thin film inertia equations (the “bulk flow” model). A one-dimensional circumferential flow dominated by inertia forces is assumed to take place in the groove and is described by an appropriate bulk flow equation. The flows in the supply orifices, the groove and the thin film lands are linked together by the same mass flow rate balance algorithm as used for hydrostatic and hybrid bearings analysis. The algorithm is extended to Lomakin bearings by considering the groove areas surrounding each orifice as a row of intercommunicating feeding pockets. This approach enables the analysis of centered, eccentric or misaligned Lomakin bearings. Comparisons with water-lubricated test results are used to validate the present model. For the zero eccentricity case a good agreement is obtained for the cross-coupled stiffness and for the whirl frequency ratio. A parametric study shows the variation of the bearing characteristics with increasing static eccentricity or misalignment. The limits of the developed thin film model are further estimated by comparing the static and zero eccentricity thin film results with a full Navier Stokes calculation.

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Chen, Ping, Shumin Zhou und Ying Shi. „Structure Design and Analysis of a Locking Band Type Quick Opening End Closure Using a New Saddle-Shaped Sealing Ring for Natural Gas Filters“. In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45449.

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A quick opening closure using a new rubber sealing ring was proposed in this paper, which can be used in natural gas transmission filters. An innovative saddle-shaped sealing ring with the feature of floatability was designed for substituting of traditional rubber C-ring. A lager gap could be allowed between the door and the top flange which made the assembling and disassembling easier than before. The theory of strength calculation and check for the whole steel structure were also presented. For an actual engineering case, a device with internal diameter of DN1550 (62inches) and design pressure of 12.6MPa (1827.5psi) was designed by rule according to Chinese national standard GB150 and analyzed by FEA (ANASYS). In addition, the sealing performance was simulated by FEM analysis (ABAQUS). Finally, the prototype was produced and the experiments for its sealing and load-bearing performance using hydrostatic test and stress test were carried out successfully.

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Ivantysyn, Roman, Ahmed Shorbagy und Jürgen Weber. „An Approach to Visualize Lifetime Limiting Factors in the Cylinder Block/Valve Plate Gap in Axial Piston Pumps“. In ASME/BATH 2017 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fpmc2017-4327.

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The lifetime of axial piston pumps is depending on the application and it’s overall robustness to external loads, but even in ideal conditions pumps will fail eventually. The analytics to this problem are known to pump manufacturers. Bearing and shaft calculations paired with FEM models are invaluable tools, however the main questions remain with the rotating kit – cylinder block, pistons, and slippers. If properly designed these parts should theoretically outlast the finite lifetime parts, such as roller bearings due to their hydrostatic and hydrodynamic bearings. In reality however failures still occur due to fatigue or other factors such as contamination or wear. This paper describes an approach for the thermal analysis of the cylinder block / valve plate sealing interface. Using a state of the art test rig the temperature distribution, instantaneous gap height as well as particle wear have been analyzed across the entire operating range of an axial piston pump at the block / valve plate sealing interface. Simulations are done with cooperation of Purdue University by using their developed gap simulation model called Caspar FSTI. These simulations along with the measurements are used to locate potential lifetime reducing operating conditions and analyze them. The first results of the thermal behavior of this interface will be presented in this paper.

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