Hydrodynamic Lubrication 2009 Part 12 docx

... March, “A Thermohydrodynamic Analysis of Journal Bearings”, Proc. I. Mech. E., Vol. 181, Part 3O, 1966-1967, pp. 117 - 126 . 6. R.G. Woolacott, W.L. Cooke, “Thermal Aspects of Hydrodynamic Journal ... (steady part) and fluctuations (unsteady part) as follows: u = u + u  ,  =  +   , p = p + p  (9.2) where ( ) shows the time average or the steady part, and (  ) indicates the unste...

Ngày tải lên: 11/08/2014, 08:21

... [1] in relation to electric contacts. 1.2.2 Hydrodynamic Lubrication Hydrodynamic lubrication, which is the subject of this book, is an ideal state of lubrication in that friction and wear hardly ... 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. S...

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... concentric, i.e., if κ = 0, we have: M j = M b = M (3.51) Equations 3.45 – 3.48 are shown in Fig. 3 .12. Fig. 3 .12. Characteristics of an infinitely long bearing under G ¨ umbel’s condition 32 3 Fundamentals ... be solved numerically. Numerical solutions include the orthogonal function expansion method [4] [12] , the finite element method [9] [10] [11] and the finite difference method [13]. The...

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... pressure valley just behind the exit. In the flat part, the pressure is lower and the film thickness is larger than those in the cylindrical part. 126 6 Foil Bearings 6.2.3 Solution Procedure Analysis ... grating, or approximately 127 µm. A hot wire anemometer is placed near the periphery of the foil disk to observe the air flow out of the foil disk. A tungsten wire 5 µm in diameter 120 6 F...

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... Alumina particles Crater Mol y bdenum Alumina particles Flake Flakes Crater Alumina particles Lubricating Oil Additives 267 1.3.9 Multifunctional nature of additives (Rizvi, 2009) A ... mater., Vol. 43, pp. 559-568 Gipson, H. (2001). Lubrication of Space Shuttle Main Engine Turbopump Bearings, Lubrication Engineering, August 2001, pp. 10 -12 ... unit is located in the room...

Ngày tải lên: 19/06/2014, 15:20

... lubrication. Recently developed theories of elastohy- drodynamic lubrication, thermohydrodynamic lubrication, turbulent hydrodynamic lubrication, and others are regarded as extensions of Reynolds’ ... called the clearance circle. The clearance circle is 2 Foundations of Hydrodynamic Lubrication The essence of hydrodynamic lubrication was first clarified experimentally by British r...

Ngày tải lên: 11/08/2014, 08:21

... Reynolds’ equation in cylindrical coordinates as follows: ∂ ∂r  h 3 12 ∂p ∂r + G c  + 1 r  h 3 12 ∂p ∂r + G c  + 1 r 2 ∂ ∂θ  h 3 12 ∂p ∂θ  = ω 2 ∂h ∂θ (4.34) where G c = ρ µr  h 0  z h  h 0  z 0 ( θ 2 )dzdz ... (Part 1)” (in Japanese), Trans. JSME, Vol. 37, No. 295, March 1971, pp. 583 - 592. 11. S. Wada and H. Hayashi, “Application of Finite Element Method to Hydrodynamic...

Ngày tải lên: 11/08/2014, 08:21

... component in the direction of eccentricity and that normal to it: P κ = 12  R j c  2 LR j π˙κ (1 − κ) 3/2 (5.2) P θ = 12  R j c  2 LR j πκ(ω − 2 ˙ θ) (2 + κ 2 ) √ 1 − κ 2 (5.3) where µ is ... 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 of Fig. 5.9, the point corresponding to the dimension...

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

... 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 = − ... Trans. ASME, Vol. 78, 1956, pp. 975 - 983. 12. V.T. Morgan and A. Cameron, “Mechanism of Lubrication in Porous Bearings”, Proceed- ings of Conference on Lubrication and Wear, IMech...

Ngày tải lên: 11/08/2014, 08:21