511 Matching Results

Search Results

Advanced search parameters have been applied.

An analysis of the effect of several parameters on the stability of an air-lubricated hydrostatic thrust bearing

Description: From Introduction: "The present investigation considers a simple nonrotating thrust bearing consisting of two round flat disks of finite diameter separated by a thin film of air. The nonlinear differential equations governing the motion of the bearing when disturbed were solved on a high-speed digital computing machine. In addition, these solutions provide a means for checking the validity of more simplified solutions (e.g., ref. 1)."
Date: October 1957
Creator: Roudebush, William H
Partner: UNT Libraries Government Documents Department

An analysis of the full-floating journal bearing

Description: Report discussing an analysis of the operating characteristics of a full-floating journal bearing, a bearing in which a floating sleeve is located between the journal and bearing surfaces, is presented together with charts from which the performance of such bearings may be predicted.
Date: 1947
Creator: Shaw, M. C. & Nussdorfer, T. J., Jr,
Partner: UNT Libraries Government Documents Department

Analytical derivation and experimental evaluation of short-bearing approximation for full journal bearing

Description: From Introduction: "This report extends the short-bearing pressure-distribution function of Michell and Cardullo to give equations for the various bearing characteristics. This short-bearing approximation makes available formulas relating eccentricity ratio to applied load, attitude angle, angular position of peak film pressure to unit pressure on projected area."
Date: 1953~
Creator: Dubois, George B. & Ocvirk, Fred W.
Partner: UNT Libraries Government Documents Department

Formation of Lubricating Films at Elevated Temperatures from the Gas Phase

Description: Abstract: Conventional liquid lubricants, when subjected to temperatures of 250*C and above for extended time in an air atmosphere, degrade rapidly to make large amounts of solid sludge and deposits. Based on boundary lubrication of bearings, these same lubricants, when subjected to 250*C to the melting point of the bearing metal, produce in the micro- to milli-second residence time in the bearing contact enough "friction polymer" to result in good lubrication. This report describes the use of these conventional liquid lubricants delivered in a homogeneous vapor phase where the carrier gas is nitrogen, air or mixtures of these two gases. The lubricants studied include alkyl and aryl phosphate esters, organic acid esters, polyphenyl ethers, and mineral oil.
Date: September 1988
Creator: Klaus, E. Erwin; Duda, J. L.; Naidu, S. K.; Munro, R. G. & Hsu, S. M.
Partner: UNT Libraries Government Documents Department

Preliminary comparison of 17- and 75-millimeter-bore cageless cylindrical roller bearings with conventional cylindrical roller bearings at high speeds

Description: Preliminary results at high speeds indicate lower bearing temperatures, less internal bearing wear, and greater reliability of the conventional, cage-type cylindrical roller bearings than of either full-complement or special cageless roller bearings of the types investigated, although the latter bearing types have been operated successfully to DN values of 1.0 X 10 superscript 6.
Date: March 5, 1953
Creator: Macks, E. Fred; Anderson, W. J. & Nemeth, Zolton N.
Partner: UNT Libraries Government Documents Department

Comparison of high-speed operating characteristics of size 215 cylindrical-roller bearings as determined in turbojet engine and in laboratory test rig

Description: A comparison of the operating characteristics of 75-millimeter-bore (size 215) cylindrical-roller one-piece inner-race-riding cage-type bearings was made by means of a laboratory test rig and a turbojet engine. Cooling correlation parameters were determined by means of dimensional analysis, and the generalized results for both the inner- and the outer-race bearing operating temperatures are computed for the laboratory test rig and the turbojet engine. A method is given that enables the designer to predict the inner- and outer-race turbine roller-bearing temperatures from single curves, regardless of variations in speed, load, oil flow, oil inlet temperature, oil inlet viscosity, oil-jet diameter, or any combination of these parameters.
Date: 1952
Creator: Macks, E. Fred & Nemeth, Zolton N.
Partner: UNT Libraries Government Documents Department

An Analysis of the Full-Floating Journal Bearing

Description: An analysis of the operating characteristics of a full-floating bearing - a bearing in which a floating sleeve is located between the journal and bearing surfaces - is presented together with charts - from which the performance of such bearings may be predicted. Examples are presented to illustrate the use of these charts and a limited number of experiments conducted upon a glass full-floating bearing to verify some results of the analysis are reported. The floating sleeve can operate over a wide range of speeds for a given shaft speed, the exact value depending principally upon the ratio of clearances and upon the ratio of radii of the bearing. Lower operating temperatures at high rotative speeds are to be expected by using a full-floating bearing. This lower operating temperature would be obtained at the expense of the load-carrying capacity of the bearing if, for comparison, the clearances remain the same in both bearings. A full-floating bearing having the same load capacity as a conventional journal bearing may be designed if decreased clearances are allowable.
Date: January 28, 1947
Creator: Shaw, M. C. & Nussdorfer, T. J.
Partner: UNT Libraries Government Documents Department

Investigation of 75-millimeter-bore deep-groove ball bearings under radial load at high speeds 1: oil-flow-studies

Description: Report presenting two 75-millimeter-bore inner-race-riding cage-type ball bearings were used in an experimental investigation of the effects of load, oil flow, and oil inlet conditions on bearing operating characteristics over a range of DN values.
Date: December 1952
Creator: Nemeth, Zolton N.; Macks, E. Fred & Anderson, William J.
Partner: UNT Libraries Government Documents Department

Investigation of 75-millimeter-bore deep-groove ball bearing under radial load at high speeds 2: oil inlet temperature, viscosity, and generalized cooling correlation

Description: Report presenting two 75-millimeter-bore inner-race-riding cage-type ball bearings used in an experimental investigation of the effects of oil inlet temperature and viscosity on bearing operating characteristics over a range of DN values. An increase in oil viscosity produced increased bearing temperatures and caused the power rejected to the oil to be greater with constant DN, load, oil flow, and oil inlet temperature.
Date: September 1953
Creator: Nemeth, Zolton N.; Macks, E. Fred & Anderson, William J.
Partner: UNT Libraries Government Documents Department

Investigation of 75-millimeter-bore cylindrical roller bearings at high speeds 2: lubrication studies - effect of oil-inlet location, angle, and velocity for single-jet lubrication

Description: Report presenting an experimental investigation of the effect of several oil introduction parameters on the temperature of 75-millimeter-bore cylindrical-roller, inner-race-riding cage-type bearings over a range of DN values and static radial loads with single-jet circulating oil feed. Results regarding effect of radial location of oil jet, angle of impingement, effect of jet diameter, power required for oil delivery, and velocity effect are provided.
Date: November 1950
Creator: Macks, E. Fred & Nemeth, Zolton N.
Partner: UNT Libraries Government Documents Department

Investigation of 75-millimeter-bore cylindrical roller bearings at high speeds: 1: Initial studies

Description: Report presenting an experimental investigation of 75-millimeter-bore roller bearings of three different cage types were conducted over a range of DN values and static radial loads with circulatory oil feed. Three incipient failures were noted out of seven bearings investigated. Results regarding rig bearing temperatures, bearing failures, effect of running time, circumferential temperature distribution, effect of DN value on operating temperature, effect of load on operating temperature, effect of circumferential temperature distribution, and effect of differential expansion upon running clearance are provided.
Date: July 1950
Creator: Macks, E. Fred & Nemeth, Zolton N.
Partner: UNT Libraries Government Documents Department

Preliminary investigation of molybdenum disulfide-air-mist lubrication for roller bearings operating to DN values of 1 x 10(exp 6) and ball bearings operating to temperatures of 1000 degrees F

Description: The effectiveness of molybdenum disulfide MoS2 as a bearing lubricant was determined at high temperature and at high speeds. A 1-inch-bore ball bearing operated at temperatures to 1000 F, a speed of 1725 rpm, and a thrust load of 20 pounds when lubricated only with MoS2-air mist. A 75-millimeter-bore cageless roller bearing, provided with a MoS2-syrup coating before operation, operated at DN values to 1 x 10(exp 6) with a load of 368 pounds.
Date: October 15, 1951
Creator: Macks, E. F.; Nemeth, Z. N. & Anderson, W. J.
Partner: UNT Libraries Government Documents Department

Comparison of performance of experimental and conventional cage designs and materials for 75-millimeter-bore cylindrical roller bearings at high speed

Description: From Summary: "The results of two investigations, one to determine the relative merits of four experimental and two conventional design 75-millimeter-bore (size 215) cylindrical roller bearings and one to determine the relative merits of nodular iron and bronze as cage materials for this size and type of bearing, are presented in this report. Nine test bearings were operated over a range of dn values (product of bearing bore in mm and shaft speed in r.p.m) from 0.3 x 10(6) to 2.3 x 20(6), radial loads for 7 to 1613 pounds, and oil flows from 2 to 8 pounds per minute with a single-jet circulatory oil feed. Of the six bearings used to evaluate designs, four were experimental types with outer-race-riding cages and inner-race-guided rollers, and two were conventional types, one with outer-race-guided rollers and cage and one with inner-race-guided rollers and cage."
Date: June 30, 1954
Creator: Anderson, William J.; Macks, E. Fred & Nemeth, Zolton N.
Partner: UNT Libraries Government Documents Department

Effect of three design parameters on the operating characteristics of 75-millimeter-bore cylindrical roller bearings at high speeds

Description: Report presenting three experimental investigation conducted with 75-millimeter-bore cylindrical roller bearings to determine the effects of roller axial clearance ratio, cage diametral clearance ratio, and cage land width-diameter ratio on bearing operating temperatures, wear, cage slip, and high-speed operating characteristics.
Date: October 1956
Creator: Anderson, William J.
Partner: UNT Libraries Government Documents Department

Lubrication and cooling studies of cylindrical-roller bearings at high speeds

Description: The results of an experimental investigation of the effect of oil inlet distribution and oil inlet temperature on the inner and outer-race temperatures of 75-millimeter-bore (size 215) cylindrical-roller inner-race-riding cage-type bearings are reported. A radial-load test rig was used over a range of dn values (product of the bearing bore in mm and the shaft speed in r.p.m) from 0.3 x 10(5) to 1.2 x 10(6) and static radial loads from 7 to 1113 pounds.
Date: April 4, 1951
Creator: Macks, E. Fred & Nemeth, Zolton N.
Partner: UNT Libraries Government Documents Department

Performance of 110-millimeter-bore M-1 tool steel ball bearings at high speeds, loads, and temperatures

Description: Report presenting eleven 110-millimeter-bore ball thrust bearings made of M-1 tool steel were operated over a range of DN values at mean outer-race temperatures to 678 degrees Fahrenheit. Testing occurred at a variety of thrust loads, radial loads, oil flows, and oil inlet temperatures. Results regarding the difference between tests without heat addition and tests with heat addition, fatigue failures, performance of cage materials, and oil-interruption tests are provided.
Date: January 1957
Creator: Anderson, William J.
Partner: UNT Libraries Government Documents Department

A Bibliography on Gas Lubricated Bearings-Revised. Interim Report

Description: A compilation of 290 references on gas bearings is presented. In most cases an English resume' of each reference is included a translation being made when required. The references are arranged alphabetically by first author. Indexes included are the year of origin corporate author, subject, patent number, and country of origin. (J.R.D.)
Date: September 15, 1959
Creator: Sciulli, E. B.
Partner: UNT Libraries Government Documents Department

Investigation of temperature limitation of various lubricants for high-temperature 20-millimeter-bore ball bearings

Description: Report presenting lubrication studies of bearings lubricated with liquids and solids in a bearing test rig under conditions of minimum lubricant flow. Six liquid lubricants were investigated, including two petroleums and four synthetics. Results regarding bearings with silver-plated beryllium copper cages, bearings with cast Inconel cages, and an analysis of experimental results are provided.
Date: January 1955
Creator: Nemeth, Z. N. & Anderson, W. J.
Partner: UNT Libraries Government Documents Department

Load capacity of aluminum-alloy crankpin bearings as determined in a centrifugal bearing test machine

Description: Report presenting the load capacities of four aluminum-alloy radial-engine crank-pin bearings determined in a centrifugal bearing test machine. Chemical analysis made after the bearings had been tested to failure showed that the actual composition of each aluminum alloy was different from the chemical specifications.
Date: August 1946
Creator: Macks, E. Fred & Shaw, Milton C.
Partner: UNT Libraries Government Documents Department

Robust Bearing Estimation for 3-Component Stations

Description: A robust bearing estimation process for 3-component stations has been developed and explored. The method, called SEEC for Search, Estimate, Evaluate and Correct, intelligently exploits the in- herent information in the arrival at every step of the process to achieve near-optimal results. In particular, the approach uses a consistent framework to define the optimal time-frequency windows on which to make estimates, to make the bearing estimates themselves, to construct metrics helpful in choosing the better estimates or admitting that the bearing is immeasurable, andjinally to apply bias corrections when calibration information is available to yield a single final estimate. The method was applied to a small but challenging set of events in a seismically active region. The method demonstrated remarkable utility by providing better estimates and insights than previously available. Various monitoring implications are noted fiom these findings.
Date: June 3, 1999
Creator: Claassen, John P.
Partner: UNT Libraries Government Documents Department

GENERATOR PAD FOUNDATIONS

Description: The purpose of this analysis is to design structural foundations for the Generator Pad. The equipment foundation shall be designed in Section 10 using standard foundation design hand calculations. The vertical loads reflect Mechanical/Electrical requirements. Lateral loads will be calculated using applicable codes. The soil bearing and foundation stresses will be analyzed using accepted engineering mechanics. The foundation will be designed using the Strength Design Method.
Date: April 27, 1995
Creator: Saltikov, T.
Partner: UNT Libraries Government Documents Department