Hydrodynamic Lubrication 2009 Part 5 potx

... given by Eqs. 5. 37 – 5. 42, the actual calculations show that Eq. 5. 58 of the Routh–Hurwitz criterion always holds, and if Eq. 5. 59 holds, Eq. 5. 60 always holds. Therefore, only Eq. 5. 59 need be ... Thus, substitution of Eqs. 5. 49 and 5. 50 into Eqs. 5. 47 and 5. 48, respectively, use of the oil film force for small vibrations Eqs. 5. 32 and 5. 33, and additional use of Eq....

Ngày tải lên: 11/08/2014, 08:21

... % Newtonian fluid 610 ,5 1 05, 9 0,023 45 4,416 280,3 1,93 0 Structural-viscous liquid (28) 51 8,4 102,6 0,0 251 2 3, 75 309,8 1 ,52 16,9 Structural-viscous liquid (29) 53 9,0 103,4 0,0246 3,789 ... min inf h , μ m * α , % Newtonian fluid 610 ,5 1 05, 9 0,02 355 4,416 280,3 1,93 0 Structurally heterogeneous fluid (30) 727,4 110,6 0,02 15 5,84 237,9 2,9 0 Table 2. The re...

Ngày tải lên: 19/06/2014, 15:20

... 150 . C 151 . D 152 . D 153 . B 154 . D 155 . A 156 . B 157 . B 158 . A 159 . B 160. B 161. A 162. D 163. D 164. B 1 65. B 166. A 167. D 168. A 169. C 170. C 171. B 172. D 173. C 174. A 1 75. D 176. C 177. C ... 1 25. B 126. B 127. B 128. B 129. A 130. A 131. B 132. D 133. D 134. C 1 35. C 136. D 137. C 138. A 139. B 140. D 141. B 142. C 143. B 144. D 1 45. B 146. A 147. A 148. C 149. D 150...

Ngày tải lên: 24/07/2014, 22:22

... OilFilmForce 71 5. 2.3 Linearization of the Oil Film Force . . . 72 5. 2.4 Equations of Motion . 75 5.2 .5 Stability Limit 76 5. 2.6 Occurrence of Oil Whip — Hysteresis . 84 5. 2.7 Coordinate Axes 88 5. 3 Stability ... Multibearing Systems 89 5. 4 Influence of Earthquakes on Oil Whip 92 5. 4.1 Basic Equations 94 5. 4.2 Examples of Simulation 95 5 .5 Limit Cycle in an Unstable Domai...

Ngày tải lên: 11/08/2014, 08:21

... circle is 2 Foundations of Hydrodynamic Lubrication The essence of hydrodynamic lubrication was first clarified experimentally by British railroad engineer Beauchamp Tower (18 45 – 1904) in 1883 [1][2]. ... London, Vol. 177, Pt. 1, 1886, pp. 157 - 234. 4. Oscar Pinkus and Beno Sternlicht, “Theory of Hydrodynamic Lubrication , McGraw-Hill Book Company, New York, 1961. 5. Norimune So...

Ngày tải lên: 11/08/2014, 08:21

... follows: 2R  π 0  L/2 0 p cos φdzdφ + P 1 cos θ = 0 (3 .57 ) 2R  π 0  L/2 0 p sin φdzdφ − P 1 sin θ = 0 (3 .58 ) By substituting Eq. 3 .56 into the above equations and using the partial fraction decomposition method ... direction, Eq. 3 .52 becomes: ∂ 2 p ∂z 2 = 6µU h 3 dh dx (3 .53 ) Substituting the bearing clearance h = c (1 + κ cos φ) into this yields: ∂ 2 p ∂z 2 = − 6µU c 2 R κ sin φ...

Ngày tải lên: 11/08/2014, 08:21

... JSME,C, Vol. 55 , No. 51 1, March 1989, pp. 774 - 779. 20. N. Tagawa and M. Hashimoto, “Ditto (Second Report, Experimental Research)” (in Japanese), Trans. JSME, C, Vol. 55 , No. 51 8, October 1989, pp. 26 25 ... (Part 1)” (in Japanese), Trans. JSME, Vol. 37, No. 2 95, March 1971, pp. 58 3 - 59 2. 11. S. Wada and H. Hayashi, “Application of Finite Element Method to Hydrodynamic Lu-...

Ngày tải lên: 11/08/2014, 08:21

... Figure 5. 25 shows the results of repeated calculations of about 350 0 steps (lasting 7 seconds), the time step being 1 /50 of the natural frequency of the shaft (Hori et al. [55 ]). Figure 5. 25a shows ... and Hori [52 ] [53 ], Hori and Kato [55 ] [57 ]). 5. 4.2 Examples of Simulation a. Response to a Sinusoidal Disturbance Let us consider a rotor system with the following parameters: L...

Ngày tải lên: 11/08/2014, 08:21

... load P 0 = 5. 25, linear stability limit M c = 36 .51 d ij j = 1 = 2 = 3 = 4 i = 1 3.4 255 1.2681 5. 9031 -2.1143 = 2 -2.4468 0.9712 -2.1143 2 .57 70 = 11 = 12 = 22 = 13 = 14 = 23 = 24 23. 259 5 -0.1478 ... 78, 1 956 , pp. 9 75 - 983. 12. V.T. Morgan and A. Cameron, “Mechanism of Lubrication in Porous Bearings”, Proceed- ings of Conference on Lubrication and Wear, IMechE, London, 1 9...

Ngày tải lên: 11/08/2014, 08:21

... calculated results and experiments (single cylinder head) [ 15] . a foil width 2 .54 cm, head radius 5. 0 cm, wrap angle 8 ◦ , foil velocity 15. 7 m/s, foil tension 0.167 kg/cm. b wrap angle 10 ◦ , the ... if x > 5. Namely, the position x = 5 is considered to be ”far enough.” And this is ”not too far.” Because calculaton shows that Reynolds’ number at the position x = 5isless than 50...

Ngày tải lên: 11/08/2014, 08:21