Hydrodynamic Lubrication 2009 Part 11 pot

... Analyses of Circular Journal Bearings 185 Fig. 8 .11. Average bearing pressure and highest temperature on the pad surface [23]. THL, thermohydrodynamic lubrication include or neglect the inertia term, ... sum of part of the supply oil q in and part of the recirculated oil q r as follows: q st = η in q in + η mix q r (8.74) where η in is the ratio of the supply oil actually involved in...

Ngày tải lên: 11/08/2014, 08:21

... Oil Whip Theory 81 Fig. 5.10. Locus of the journal center for finite length bearings [18] Fig. 5 .11. Eccentricity of the journal for finite length bearings [18] ditions can be discussed in a similar ... journal center will be as shown in Fig. 5.10; the eccentricity ratio can be obtained from Fig. 5 .11. The stability chart in this case is shown in Fig. 5.12 (Gotoda [18] [20]). As in the case o...

Ngày tải lên: 11/08/2014, 08:21

... and θ y are not equal to zero (nontrivial): f (s) = 0 (5.74) The shaft will be stable if the real parts of all the roots of the characteristic equation are negative. Figures 5.21a,ba and 5.21a,bb ... amplitude, the journal center performs steady revolution around the bearing center for the major part of the bearing length, as shown in Fig. 5.8a,bb. Therefore, by setting the time derivative...

Ngày tải lên: 11/08/2014, 08:21

... Cycle in an Unstable Domain 101 M dX 3 dt = − d 11 X 1 − d 12 X 2 − d 13 X 3 − d 14 X 4 − d 111 X 2 1 − d 112 X 1 X 2 − d 122 X 2 2 − d 113 X 1 X 3 − d 114 X 1 X 4 − d 123 X 2 X 3 − d 124 X 2 X 4 (5.94) M dX 4 dt = ... Supported by Porous Bearings”, Proc. the JSLE-ASLE International Lubrication Conference, Tokyo, June 9 - 11, 1975, pp. 333 - 340. 116 5 Stability of a Rotating Sh...

Ngày tải lên: 11/08/2014, 08:21

... a cylindrical rubber block 116 mm in diameter and 50 mm high. The pressure experi- mentally obtained and that calculated by the theory of Section 7.4.1 are compared in Figs. 7 .11 and 7.12. Young’s ... alternately. 140 7 Squeeze Film If ˙ h < 0, p = 0atr = r a (7 .11) If ˙ h > 0, p = −∆p at r = r a (7.12) Whereas for a positive squeeze (Eq. 7 .11) , the pressure at the periphery of t...

Ngày tải lên: 11/08/2014, 08:21

... NACA Tech. Report 117 4, Washington, D.C., 1953. 5. E.R. van Driest, “On Turbulent Flow Near a Wall”, Journal of Aeronautical Science, Vol. 23, No. 11, November 1956, pp. 1007 - 1 011. 6. H. Reichardt, ... 1967. 11. F.K. Orcut and E.B. Arwas, “The Steady-State and Dynamic Characteristics of a Full Cir- cular Bearing and a Partial Arc Bearing in the Laminar and Turbulent Flow Regimes”, Jou...

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... Tribology - Lubricants and Lubrication 250 moving parts apart to minimize wear. The lubricant does this by reducing friction and removing heat from moving parts. Contaminants pose an additional ... film thickness (nm) Contact angle Sample F 2.4-2.9 116 ° 1.1-1.5 89° Sample G 2.3-2.7 110 ° 2.1-2.5 107° Sample H 2.3-2.7 111 ° 1.9-2.5 108° Table 4. Film thickness and wa...

Ngày tải lên: 19/06/2014, 15:20

... traditional concepts due to the following conditions: • The potential for center-line-crossing related accidents due to merge conflicts or motorist confusion. • The potential for wrong way or U-turn movements. • ... least the posted speed of the freeway, its length may be included as part of the deceleration length. (b) Gores, Figure 940 -11, are decision points that must be clearly seen an...

Ngày tải lên: 10/08/2014, 20:20

... 109 5.8.2 Stability of a Shaft System . . . 110 5.9 Chaos in Rotor–Bearing Systems 111 5.10 PreventionofOilWhip 113 References 114 6 Foil Bearings 119 6.1 Basic Equations 121 6.2 Finite Element ... Y. H . 4 1 Friction, Wear, and Lubrication the hydrodynamic lubrication described above and boundary lubrication which will be explained later and is called mixed lubrication. Si...

Ngày tải lên: 11/08/2014, 08:21

... experiments and studied them theoretically. In the introductory part of his famous paper of 1886 [3] on hydrodynamic lubrication, Reynolds wrote: Lubrication, or the action of oils and other viscous fluids ... called the clearance circle. The clearance circle is 2 Foundations of Hydrodynamic Lubrication The essence of hydrodynamic lubrication was first clarified experimentally by...

Ngày tải lên: 11/08/2014, 08:21