Application of Finite-Element Method to Hydrodynamic Lubrication Problems : Part 2, Finite-Width Bearings
01 Nov 1971-Jsme International Journal Series B-fluids and Thermal Engineering (The Japan Society of Mechanical Engineers)-Vol. 14, Iss: 77, pp 1234-1244
About: This article is published in Jsme International Journal Series B-fluids and Thermal Engineering.The article was published on 1971-11-01 and is currently open access. It has received 32 citations till now. The article focuses on the topics: Lubrication & Fluid bearing.
Citations
More filters
Patent•
15 Aug 1994
TL;DR: In this article, a one piece hydrodynamic bearing which can include hydrostatic support features is proposed for tilt-pad bearing applications, which is very attractive in cryogenic applications where it is difficult to prevent leakage in conventional hydrostatic tilt pad bearings.
Abstract: A one piece hydrodynamic bearing which can include hydrostatic support features. The pads are supported on a single thin web for pivoting on a support structure which can include one or more beam-like members. The bearings may have hydrostatic and active control attributes and is very attractive in cryogenic applications where it is very difficult to prevent leakage in conventional hydrostatic tilt pad bearings. The hydrostatic feed through the post eliminates this problem completely and prevents the fretting at the pivots common with conventional tilt pad bearings. A cavity provided under a pad support membrane can be used as an active control device. The pressure can cause the bearing set or assembly clearance to be reduced thus providing better damping and centering capability. The preload in the pad can be actively controlled in this manner. The pad has a limiting device to prevent a negative pre-load condition from occurring. This active control of bearing clearance can allow bearings to operate at large spreads in temperatures.
122 citations
TL;DR: In this paper, the effects of geometric change due to wear on the dynamic characteristics of journal bearings are determined theoretically in both laminar and turbulent regimes, and the numerical results for various wear depth parameters are indicated in graphical form.
Abstract: The effects of geometric change due to wear on the dynamic characteristics of journal bearings are determined theoretically in both laminar and turbulent regimes. The dynamic characteristics such as spring and damping coefficients and whirl onset speed of a rigid rotor supported by two identical symmetrically aligned bearings are analyzed by a semianalytical finite element method, and the numerical results for various wear depth parameters are indicated in graphical form. The geometric change due to wear has significant effects on the principal spring coefficients and on the cross-coupled damping coefficients. The whirl onset speed for a worn journal bearing whose wear depth parameter is larger than 0.3 becomes higher than the speed for a nonworn bearing.
85 citations
Patent•
21 Jun 1993
TL;DR: In this article, a method and apparatus for designing hydrodynamic bearing having movable bearing pads and a method for supporting a rotating shaft with such bearings is presented, where the bearing design is altered until an acceptable design is arrived at.
Abstract: A method and apparatus for designing hydrodynamic bearings having movable bearing pads and a method for supporting a rotating shaft with such bearings. Bearing pad position under load is calculated using finite element analysis to determine influence coefficients, which are then used in conjunction with a two-dimensional model of the fluid film to provide the steady-state behavior of the bearing. The bearing design is altered until an acceptable design is arrived at. A bearing designed according to this method can be used to support a rotating shaft.
44 citations
TL;DR: In this article, a comparative study is made of various finite difference and finite element solutions of the Reynolds equation for the steady, isoviscous, incompressible hydrodynamic lubrication problem.
Abstract: A comparative study is made of various finite difference and finite element solutions of the Reynolds equation for the steady, isoviscous, incompressible hydrodynamic lubrication problem. Numerical solutions are obtained for both one- and two-dimensional slider bearings, and the predicted load capacity is evaluated against that of the corresponding exact analytical solution. Two finite difference schemes of nominal second-and fourth-order accuracy are employed. Linear, quadratic, and cubic elements are used in the finite element solutions. The different solution methods are evaluated in terms of accuracy, computational complexities and cost. Presented at the 40th Annual Meeting in Las Vegas, Nevada May 6–9, 1985
31 citations
Patent•
28 Sep 1993
TL;DR: A hydrodynamic bearing which includes a carrier and a plurality of bearing pads circumferentially spaced about the carrier is designed such that the openings formed therein are supported as sets of supports such that each group of openings includes one opening of each set of openings.
Abstract: A hydrodynamic bearing which includes a carrier and a plurality of bearing pads circumferentially spaced about the carrier. The carrier is formed with a series of circumferentially spaced groups of pad support openings. Each group of pad support openings includes two or more pad support openings each of which is capable of supporting a pad, but only one of which supports a pad at any one time. The carrier is designed such that the openings formed therein are supported as sets of supports such that each group of openings includes one opening of each set of openings. The carrier supports the openings such that the support of each opening within each set is substantially identical to that of the other openings in its set, but different than the support of the openings of other sets such that each set of bearing pad openings is adapted to support bearing pads for a distinct characteristic deflection.
30 citations
References
More filters