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Keywords: hydrostatics
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Journal Articles
Article Type: Technical Briefs
J. Tribol. July 2011, 133(3): 034501.
Published Online: June 17, 2011
...Roberto Bassani This chapter deals with a hydrodynamic journal bearing provided with hollow bushings, capable of supporting very high loads, even at low speeds, at which separation between the shaft and the housing’s bushing is induced by a specific self-regulating hydrostatic system. The same...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2010, 132(2): 021703.
Published Online: April 13, 2010
...E. Rajasekhar Nicodemus; Satish C. Sharma The objective of the present work is to study theoretically the influence of wear on the performance of four-pocket capillary-compensated hydrostatic journal bearing operating with micropolar lubricant. In the present study, the lubricant containing...
Journal Articles
Article Type: Research Papers
J. Tribol. January 2010, 132(1): 011103.
Published Online: November 13, 2009
...O. J. Bakker; R. A. J. van Ostayen Inertial effects due to the centripetal forces may become dominant at high rotational speeds in hydrostatic thrust bearings. Although this influence has been recognized in literature, bearings are commonly optimized with respect to the minimum friction...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2009, 131(4): 041701.
Published Online: September 21, 2009
... clearance of 0.02–0.025 mm are analyzed. It is assumed that the fluid film force of the hydrostatic/hydrodynamic conical bearing is characterized by a set of linear stiffness and damping coefficients. The experiment used the impulse excitation method to recognize these coefficients and established...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2009, 131(2): 021103.
Published Online: March 4, 2009
...Suresh Verma; Vijay Kumar; K. D. Gupta This paper presents a theoretical study of the performance characteristics of a constant flow valve compensated multirecess hydrostatic journal bearings operating with micropolar lubricant. The finite element method and iterative procedure have been used...
Journal Articles
Article Type: Technical Papers
J. Tribol. October 2007, 129(4): 876–886.
Published Online: May 30, 2007
... the numerical conservation of mass and momentum. The influence of mesh size on numerical precision is also analyzed. Finally, the model is applied to a misaligned hydrostatic seal. These seals operate with a substantial leakage flow, where nonlaminar phenomena occur. The influence of inertia and misalignment...
Journal Articles
Article Type: Technical Papers
J. Tribol. July 2007, 129(3): 595–602.
Published Online: March 10, 2007
... viscosity hydrostatics lubrication surface roughness non-Newtonian lubricant journal bearing hydrostatic The applications of hole-entry hybrid journal bearings (Fig. 1 ) are quite wide and varied due to their superior performance, such as improved load-carrying capacity at zero and high...
Journal Articles
Article Type: Technical Papers
J. Tribol. July 2007, 129(3): 655–659.
Published Online: January 16, 2007
... supply ports located in x and y directions, respectively, as shown in Fig. 9b . The idea of the cross gas supply method comes from Ref. 11 , in which Liu and Spakovszky proposed this method to increase whirl stability for ultrashort Lomakin type hydrostatic gas bearings. Gas supply...
Journal Articles
Article Type: Research Papers
J. Tribol. July 2006, 128(3): 566–574.
Published Online: March 21, 2006
... that this assumption applies in many cases encountered in fluid film lubrication. The model is validated by comparison with experimental data and previous theoretical studies. A thermoelastohydrodynamic analysis of a hydrostatic seal is performed. The substantial influence of inertia terms on leakage rate prediction...
Journal Articles
Article Type: Research Papers
J. Tribol. July 2006, 128(3): 551–558.
Published Online: March 1, 2006
... turbomachinery. These characteristics are adequate load support, good stiffness and damping coefficients, low friction and wear during rotor startup and shutdown, and most importantly, enhanced rotordynamic stability at the operating speed. Hybrid (hydrostatic/hydrodynamic) flexure pivot-tilting pad bearings...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2006, 128(2): 345–350.
Published Online: November 3, 2005
...Y. Feldman; Y. Kligerman; I. Etsion; S. Haber Microdimples generated by laser surface texturing (LST) can be used to enhance performance in hydrostatic gas-lubricated tribological components with parallel surfaces. The pressure distribution and load carrying capacity for a single three-dimensional...
Journal Articles
Article Type: Technical Briefs
J. Tribol. July 2005, 127(3): 679–684.
Published Online: June 13, 2005
...S. Charles; O. Bonneau; J. Fre^ne The characteristics of hydrostatic bearings can be influenced by the compensating device they use, for example, a thin-walled orifice (diaphragm). The flow through the orifice is given by a law where an ad hoc discharge coefficient appears, and, in order...
Journal Articles
Article Type: Technical Papers
J. Tribol. January 2005, 127(1): 130–140.
Published Online: February 7, 2005
... obtained with low Reynolds number turbulent flows. The present model, coupled with a scaling factor for taking into account the transition to turbulence, is therefore accurate for all of the typical Reynolds number values recorded in lubrication. The model is then applied to hydrostatic noncontacting face...
Journal Articles
Article Type: Research Papers
J. Tribol. July 2005, 127(3): 557–567.
Published Online: August 26, 2004
... 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...
Journal Articles
Article Type: Technical Papers
J. Tribol. April 2002, 124(2): 398–405.
Published Online: February 1, 2001
...S. Yoshimoto, Professor; S. Oshima, Graduate Student; S. Danbara, Research Associate; T. Shitara In this paper, the stability of water-lubricated, hydrostatic, conical bearings with spiral grooves for high-speed spindles is investigated theoretically and experimentally. In these bearing types...
Journal Articles
Article Type: Technical Papers
J. Tribol. October 2000, 122(4): 822–827.
Published Online: September 21, 1999
...Akira Azushima In order to investigate into the quantitative relationship between the hydrostatic pressure generated within the surface pocket of the workpiece and the normal pressure acting on the real contact area at the interface of metal forming such as drawing, rolling, forging and so...
Journal Articles
Article Type: Technical Papers
J. Tribol. January 2000, 122(1): 170–180.
Published Online: June 10, 1999
...Luis San Andre´s Advanced cryogenic fluid turbopumps are very compact, operate at extremely high shaft speeds, and require hybrid (hydrostatic/hydrodynamic) radial and thrust fluid film bearings for accurate rotor positioning. Sound design and reliable operation of fluid film thrust bearings also...