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  • 1
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    Simultaneous pressure measurement and high-speed photography study of cavitation in a dynamically loaded journal bearing (1993)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-24
    Beschreibung: Cavitation of the oil film in a dynamically loaded journal bearing was studied using high-speed photography and pressure measurement simultaneously. Comparison of the visual and pressure data provided considerable insight into the occurence and non-occurrence of cavitation. It was found that (1), cavitation typically occurred in the form of one bubble with the pressure in the cavitation bubble close to the absolute zero; and (2), for cavitation-producing operating conditions, cavitation did not always occur; with the oil film then supporting a tensile stress.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: ASME, Transactions, Journal of Tribology (ISSN 0742-4787); p. 88-95.
    Format: text
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  • 2
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    Two reference time scales for studying the dynamic cavitation of liquid films (1992)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-24
    Beschreibung: Two formulas, one for the characteristic time of filling a void with the vapor of the surrounding liquid, and one of filling the void by diffusion of the dissolved gas in the liquid, are derived. By comparing these time scales with that of the dynamic operation of oil film bearings, it is concluded that the evaporation process is usually fast enough to fill the cavitation bubble with oil vapor; whereas the diffusion process is much too slow for the dissolved air to liberate itself and enter the cavitation bubble. These results imply that the formation of a two phase fluid in dynamically loaded bearings, as often reported in the literature, is caused by air entrainment. They further indicate a way to simplify the treatment of the dynamic problem of bubble evolution.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: ASME, Transactions, Journal of Tribology (ISSN 0742-4787); 114; 3, Ju
    Format: text
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  • 3
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    Wormgear geometry adopted for implementing hydrostatic lubrication and formulation of the lubrication problem (1995)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The geometrical parameters for a wormgear intended to be used as the transmission in advanced helicopters are finalized. The resulting contact pattern of the meshing tooth surfaces is suitable for the implementation of hydrostatic lubrication Fluid film lubrication of the contact is formulated considering external pressurization as well as hydrodynamic wedge and squeeze actions. The lubrication analysis is aimed at obtaining the oil supply pressure needed to separate the worm and gear surfaces by a prescribed minimum film thickness. The procedure of solving the mathematical problem is outlined.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: AD-A290331 , ARL-CR-219 , E-9345 , NAS 1.26:195416 , NASA-CR-195416
    Format: application/pdf
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  • 4
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    Study of the kinematic and load sharing properties of wormgearing with non-symmetric tooth profiles (1995)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The geometry of non-symmetric tooth profiles, i.e. tooth profiles with different pressure angles on the two sides of the tooth, is studied. A feasible non-symmetric tooth profile for application in helicopter transmissions is laid out as the best compromise among several conflicting factors. The non-symmetric tooth profile is then compared with the symmetric tooth profile studied previously. Based on the detailed comparisons it is concluded that the use of the non-symmetric tooth profile would severely limit the face width of the worm, consequently reduce the number of meshing teeth and cause much higher normal load on the individual gear teeth.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: NASA-CR-195414 , E-9303 , NAS 1.26:195414 , ARL-CR-220
    Format: application/pdf
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  • 5
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    Study of the kinematic and dynamic characteristics of a wormgear transmission for helicopter applications (1994)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The first phase of the study of the performance of a wormgear transmission is reported. In this phase the work included the selection of a double-enveloping wormgear type, and its dimensions, suitable for use in helicopter transmissions; the 3-D graphics representation of the selected wormgear using the I-DEAS software; the analysis of the kinematics of meshing; the analysis of load sharing among the meshing teeth; and the implementation of the analyses in a computer program. The report describes the analyses, their results, and the use of the computer programs.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: AD-A289960 , ARL-CR-78 , E-8633 , NAS 1.26:195287 , NASA-CR-195287
    Format: application/pdf
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  • 6
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    Simultaneous pressure measurement and high-speed photography study of cavitation in a dynamically loaded journal bearing (1994)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Cavitation of the oil film in a dynamically loaded journal bearing was studied using high-speed photography and pressure measurement simultaneously. Comparison of the visual and pressure data provided considerable insight into the occurrence and nonoccurrence of cavitation. It was found that (1) for the submerged journal bearing, cavitation typically occurred in the form of one bubble with the pressure in the cavitation bubble close to the absolute zero; and (2) for cavitation-producing operating conditions, cavitation did not always occur; with the oil film then supporting a tensile stress.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: AD-A289963 , ARL-TR-10 , E-6834 , NAS 1.15:106456 , NASA-TM-106456 , ASME/STLE Tribology Conference; Oct 18, 1992 - Oct 21, 1992; San Diego, CA; United States
    Format: application/pdf
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  • 7
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    A high speed photography study of cavitation in a dynamically loaded journal bearing (1991)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: The earlier study made by Jacobson and Hamrock on the cavitation of liquid lubricant films in a dynamically loaded journal bearing was repeated with a quartz sleeve, which was more rigid than the Polymethylmethacrylate (PMMA) sleeve used previously. Various improvements of the test rig were made concomitantly so that the experimental errors could be better controlled and assessed. The updated speed photography experiment and its results are described.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: ASME PAPER 90-TRIB-19 , ASME, Transactions, Journal of Tribology (ISSN 0742-4787); 113; 287-292;
    Format: text
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  • 8
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    A high-speed photography study of cavitation in a dynamically loaded journal bearing (1990)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The earlier study made by Jacobson and Hamrock on the cavitation of liquid lubricant films in a dynamically loaded journal bearing was repeated with a quartz sleeve, which was more rigid than the Polymethylmethacrylate (PMMA) sleeve used previously. Various improvements of the test rig were made concomitantly so that the experimental errors could be better controlled and assessed. The updated speed photography experiment and its results are described.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: NASA-TM-103178 , E-5547 , NAS 1.15:103178 , AVSCOM-TR-90-C-013 , AD-A225679 , Joint Tribology Conference; Oct 07, 1990 - Oct 10, 1990; Toronto, Ontario; Canada
    Format: application/pdf
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