Download or read book Computation of Pressurized Gas Bearings Using Ce Se Method written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-20 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The space-time conservation element and solution element (CE/SE) method is extended to compute compressible viscous flows in pressurized thin fluid films. This numerical scheme has previously been used successfully to solve a wide variety of compressible flow problems, including flows with large and small discontinuities. In this paper, the method is applied to calculate the pressure distribution in a hybrid gas journal bearing. The formulation of the problem is presented, including the modeling of the feeding system. the numerical results obtained are compared with experimental data. Good agreement between the computed results and the test data were obtained, and thus validate the CE/SE method to solve such problems. Cioc, Sorin and Dimofte, Florin and Keith, Theo G., Jr. and Fleming, David P. Glenn Research Center NASA/TM-2003-212110, NAS 1.15:212110, E-13764

Download or read book Computation of Pressurized Gas Bearings Using CE SE Method written by and published by . This book was released on 2003 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book COMPOSITION OF PRESSURIZED GAS BEARINGS USING CE SE METHOD NASA TM 2003 212110 NATIONAL AERONAUTICS AND SPACE ADMINISTRATION written by United States. National Aeronautics and Space Administration and published by . This book was released on 2003* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Calculation of the Boundaries of the Region of Stable Equilibrium of a Rotor in Pressurized Gas Bearings written by R. Z. Aliev and published by . This book was released on 1971 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study is reported of the stability of the equilibrium state of a rotor in a pressurized gas bearing. The equations for the perturbed motion of the rotor are considered together with the Reynolds equations for the pressures in the lubricant layer. The conditions of equilibrium stability are established by the small perturbation method in a linear approximation. A numerical method of solving the basic equations is outlined, and the results of certain computer calculations are presented.

Download or read book Numerical Method of Solving the Reynolds Equation for a Pressurized Gas Bearing written by R. Z. Aliev and published by . This book was released on 1971 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study is reported of a radial gas bearing of finite length with forced pressurization. A finite-difference method of solving the Reynolds equation for the pressures in the lubricant layer is outlined. The basic equations are obtained under the usual assumptions made in isothermal lubrication theory. The feed ports are schematized by continuous pressurization line. The results of computer calculations of the bearing characteristics are presented and analyzed.

Download or read book Stability Analysis for Unloaded Externally Pressurized Gas lubricated Bearings with Journal Rotation written by David P. Fleming and published by . This book was released on 1968 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 41st AIAA ASME SAE ASEE Joint Propulsion Conference Exhibit 10 13 July 2005 Tucson Arizona 05 4350 05 4399 written by and published by . This book was released on 2005 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Application of the Space time Conservation Element and Solution Element Numerical Method to Flows in Fluid Films written by Sorin Cioc and published by . This book was released on 2004 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work, situated at the confluence between CFD and tribology, is the first application of a relatively new numerical method, the space-time conservation element and solution element (CE/SE) method, to flows in thin films. The general features of the numerical method are highlighted, and also the concept of fluid film bearings is presented. The formulations of the governing equations and boundary conditions for four main cases are shown: 1-D and 2-D cavitated bearings using Elrod's formulation, hybrid gas bearings, and gas bearings including inertial effects. The numerical formulations applied on both uniform and non-uniform grids are presented, with emphasis on the important features of the method when used to solve these specific problems, including the formulation of the boundary conditions. Based on the described formulations, numerical codes have been developed. The results obtained are compared with experimental values, theoretical results, and numerical results obtained by using other algorithms. In the case of cavitated bearings, because the algorithm developed is capable of capturing potential discontinuities, the differences between the results obtained with the CE/SE method and with previous methods are significant when the position of the full film reformation point is not imposed through the supply system (boundary conditions). Important differences have also been noted in the case of gas bearings including inertia effects. Results demonstrate that the inclusion of inertial effects becomes necessary when the bearing speed is very high and/or the film clearance is large. Flow discontinuities are shown to occur in a manner similar to that of shock waves in supersonic flows. Comparisons prove that the CE/SE method, when contrasted to previous algorithms, can successfully predict the pressure distribution within bearings, including cases with discontinuities in the lubricant film. Moreover, the method accomplishes this without any special treatment and without introducing distortion and/or excessive dissipation into the solution. The method is thus a strong candidate in applications that require more precise results, such as accurate, robust computation of the cavitation boundaries, as well as for transient problems. The method is also a perfect candidate in more complex problems, such as flows at very high speeds with inertia effects.

Download or read book Analysis and Design of Externally Pressurized Gas Bearings written by I. C. TANG and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: Equations for flow rate, pressure, load, and stiffness of externally pressurized thrust and journal bearings are given for purely viscous isothermal gas films with longitudinal and radial flow and no relative surface motion. Charts are presented by means of which the bearing characteristics can be evaluated in terms of the bearing configuration, the ratio of supply to ambient pressure, and a bearing parameter. Sample characteristics of thrust and journal bearings are established using the curves, and experimental confirmation shown. A method of treating bearing films with two inlet-restricting orifices in series is described. (Author).

Download or read book ASME 68 LubS 44 written by L. G. Stepanyants and published by . This book was released on 1968 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ASME 66 Lub 5 written by Haruo Mori and published by . This book was released on 1966 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Approximate Calculation Methods for Gas Lubricated Journal Bearings written by V. N. Constantinescu and published by . This book was released on 1968 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: The directions and magnitudes of the errors introduced in the various approximate methods of solving the nonlinear pressure differential equation for gas-lubricated journal bearings (Harrison piecewise linearization of lubricant-thickness variation; Katto-Soda and Ausman methods of linearizing the equation by series expansion using velocity, reciprocal velocity and eccentricity as small parameters, and others) are examined. (Author).

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1987 with total page 1126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book A Study of the Stability of Externally Pressurized Gas Bearings written by Lazar Licht and published by . This book was released on 1958 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Keywords Index to U S Government Technical Reports written by United States. Department of Commerce. Office of Technical Services and published by . This book was released on 1962 with total page 990 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Earth Deep Interior High pressure Experiments and Theoretical Calculations From the Atomic to the Global Scale written by Lidong Dai and published by Frontiers Media SA. This book was released on 2022-07-12 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study on a Stabilizing Method for Externally Pressurized Gas Thrust Bearings written by M. Yoshinaga and published by . This book was released on 1980 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: