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Keywords: shafts
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Journal Articles
Article Type: Research Papers
J. Tribol. July 2011, 133(3): 031703.
Published Online: July 28, 2011
... containing additives and contaminants has been modeled using Erigen’s micropolar theory. The journal misalignment which may occur as a result of noncentral loading, improper assembly, shaft deflection due to elasticity and thermal distortions, etc. has been accounted for in the present study by defining...
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: Technical Briefs
J. Tribol. October 2010, 132(4): 044502.
Published Online: September 23, 2010
... crankshaft cylinder block internal combustion engine elastic deformation elastodynamics heat engines hydrodynamics lubrication machine bearings shafts 14 11 2009 16 07 2010 23 09 2010 23 09 2010 2010 American Society of Mechanical Engineers ...
Journal Articles
Article Type: Research Papers
J. Tribol. July 2010, 132(3): 031802.
Published Online: July 21, 2010
... pressures less than 10 MPa. For bearings subject to loads that are both variable and predictable, GELs could be used to adjust lubricant properties in real time. High-pressure lubricants, mostly gases, have already been explored in tilting-pad journal bearings as a means to accommodate higher shaft speeds...
Journal Articles
Article Type: Research Papers
J. Tribol. January 2010, 132(1): 011701.
Published Online: November 11, 2009
... by conduction and convection to assist in the design and troubleshooting of rotor-GFB systems operating hot. Bearing temperatures and shaft motions measurements are obtained in a test rotor electrically heated to 132 ° C . In speed-up tests to 26 krpm, the rotor motion amplitude drops suddenly just above...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2008, 130(4): 041101.
Published Online: August 1, 2008
...H. Arslan; N. Aktürk In this paper, a shaft-bearing model is developed in order to investigate the rolling element vibrations for an angular contact ball bearing with and without defects. The shaft-bearing assembly is considered as a mass-spring system. The system shows a nonlinear characteristic...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2008, 130(2): 021504.
Published Online: April 8, 2008
... sensitively according to the shaft speed. Moreover, all operating characteristics such as film thickness and power loss are significantly influenced by the local temperature effect. The problem parameters are b = 0.1 mm , λ = 0.0125 mm , h 1 = 0.4 μ m , h 2...
Journal Articles
Article Type: Technical Papers
J. Tribol. October 2007, 129(4): 887–894.
Published Online: June 6, 2007
... of bearing has a direct effect on crankshaft strength. finite element analysis internal combustion engines lubrication shafts tribology bearing stiffness strength crankshaft A crankshaft is one of the most important parts for an internal combustion engine. The whole dimension...
Journal Articles
Article Type: Technical Papers
J. Tribol. October 2007, 129(4): 851–859.
Published Online: April 2, 2007
...Philip C. Hadinata; Lyndon Scott Stephens A numerical analysis is conducted to investigate the elastohydrodynamic effect of deterministic microasperities on the shaft of a lip seal. Various geometries of microasperities (triangular, square, hexagonal, and circular) are put into a 100 × 100 μ m 2...
Journal Articles
Article Type: Technical Papers
J. Tribol. July 2007, 129(3): 655–659.
Published Online: January 16, 2007
...Shuji Tanaka; Masayoshi Esashi; Kousuke Isomura; Kousuke Hikichi; Yuki Endo; Shinichi Togo A microbearing tester driven by an air turbine of 10 mm diameter has been developed, and successfully used to test hydroinertia gas bearings with a shaft of 4 mm diameter. The effects of bearing gas pressure...
Journal Articles
Article Type: Technical Papers
J. Tribol. April 2007, 129(2): 348–353.
Published Online: December 5, 2006
...Guang Qiao; Liping Wang; Tiesheng Zheng This paper describes a mathematical model to study the linear stability of a tilting-pad journal bearing system. By employing the Newton-Raphson method and the pad assembly technique, the full dynamic coefficients involving the shaft degrees of freedom...
Journal Articles
Article Type: Technical Papers
J. Tribol. January 2007, 129(1): 129–134.
Published Online: September 18, 2006
... in design to a gas tooth on stator annular labyrinth seal. The main difference is the windback seal has only one tooth, which continuously winds around the shaft like a screw thread. These seals are used in gas compressors to isolate the gas face seal from bearing oil. A purge gas is passed through the seal...
Journal Articles
Article Type: Technical Briefs
J. Tribol. January 2007, 129(1): 199–204.
Published Online: July 14, 2006
... studies are reported for a brush seal whose bristle tips are subjected to rotor induced loading that is associated with bristle∕rotor interference or eccentric rotation of the shaft. In order to extend the range of applicability of numerical solutions, results are reported in terms of nondimensional brush...
Journal Articles
Article Type: Technical Papers
J. Tribol. January 2007, 129(1): 98–105.
Published Online: June 23, 2006
... at the mid-plane of the bearing, temperature profiles at the oil-bush and oil-shaft interfaces, bush torque, oil flow rate, and the position of the shaft were measured for variable operating conditions. Shaft rotational speed ranged from 1000 to 4000 rpm and two different values of applied load were tested...
Journal Articles
Article Type: Technical Briefs
J. Tribol. July 2006, 128(3): 670–673.
Published Online: February 24, 2006
...Tae Ho Kim; Luis San Andrés Commercial oil-free microturbomachinery implements gas foil bearings (GFBs) for reliable performance with improved efficiency. However, GFB modeling is still largely empirical, lacking experimental validation. An analysis of simple GFBs operating at large shaft speeds...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2006, 128(2): 252–261.
Published Online: December 8, 2005
... of shaft and cage frequencies, respectively. The model has also predicted some additional components at harmonics of shaft and cage frequencies due to a local defect on the inner race and a rolling element, respectively. The expressions for all these spectral components have also been derived. Typical...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2005, 127(4): 813–819.
Published Online: June 23, 2005
... as a result of shaft bending under load is studied. The results show obvious changes at distribution and value of oil film pressure, oil film thickness and oil temperature of journal bearing due to journal misalignment. The higher the load on the shaft, the larger the journal misalignment resulted from shaft...
Journal Articles
Article Type: Article
J. Tribol. April 2005, 127(2): 416–424.
Published Online: April 7, 2005
...Aurelian Fatu; Mohamed Hajjam; Dominique Bonneau An elastohydrodynamic (EHD) analysis is performed for two misaligned hybrid journal bearings working on the same shaft. To predict the correct system behavior we are forced to consider the interdependence between the two bearings and the shaft...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2005, 127(4): 826–836.
Published Online: August 6, 2004
... location on the rod stem midsection. Connecting-rod stress calculated using finite element analysis, under tensile loading Both static and dynamic calibration of the instrumented connecting rod was carried out using a hydraulic Dartec Universal Testing Machine. Special machined shafts were...