... 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...

...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...

... to further improve the prediction precision of lubrication performance of crankshaft bearing. 14 11 2009 16 07 2010 23 09 2010 23 09 2010 elastic deformation elastodynamics heat engines hydrodynamics lubrication machine bearings shafts elastohydrodynamic lubrication...

... 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...

... 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...

...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...

... 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. e-mail: amaoui@iutang.univ-poitiers.fr e-mail: hajjam@iutang.univ-poitiers.fr e-mail: dbonneau@iutang.univ...

.... 09 06 2006 06 06 2007 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 and weight...

...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...

...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...

...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...

... 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...

... 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...

... 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...

...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...

... 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...

... 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...

...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...

... , R. A. , 2004 , “ Total and Component Friction in a Motored and Firing Engine ,” Ph.D. thesis, School of Mechanical Engineering, University of Leeds, UK, pp. 1 – 276 . 10 03 2004 06 08 2004 pistons internal combustion engines engine cylinders friction shafts lubricants...