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دانلود کتاب Bearing Design in Machinery: Engineering Tribology and Lubrication

عنوان فارسی :

دانلود کتاب طراحی یاتاقان در ماشین آلات: تریبولوژی مهندسی و روغن کاری

عنوان انگلیسی :

Bearing Design in Machinery: Engineering Tribology and Lubrication

زبان : English

موضوع : Technology->Mechanical Engineering

نویسندگان : Roger Beck

ناشر : CRC Press, Marcel Dekker

ISBN (شابک) : 9781405110747, 1405110740

تعداد صفحات : 640\640

سال نشر : 2002     ویرایش : 1

حجم : 10 MB       فرمت : pdf

قیمت : 28000 تومان

فهرست :



Table of contents :
Bearing Design In Machinery: Engineering Tribology And Lubrication......Page 1
Dedication......Page 2
Preface......Page 3
Nomenclature For Hydrodynamic......Page 14
Nomenclature For Hydrostatic Bearings......Page 15
Nomenclature For Rolling Element......Page 16
Contents......Page 7
1.1 INTRODUCTION......Page 18
Contents......Page 0
1.1.1 Radial and Thrust Bearings......Page 20
1.1.2 Bearing Classification......Page 21
1.2 DRY AND BOUNDARY LUBRICATION BEARINGS......Page 22
1.3 HYDRODYNAMIC BEARING......Page 23
1.3.1 Disadvantages of Hydrodynamic Bearings......Page 25
1.4 HYDROSTATIC BEARING......Page 26
1.5 MAGNETIC BEARING......Page 29
1.5.1 Disadvantages of Magnetic Bearings......Page 30
1.6 ROLLING- ELEMENT BEARINGS......Page 31
1.7 SELECTION CRITERIA......Page 34
1.8 BEARINGS FOR PRECISION APPLICATIONS......Page 36
1.9 NONCONTACT BEARINGS FOR PRECISION APPLICATIONS......Page 37
1.10 BEARING SUBJECTED TO FREQUENT STARTS AND STOPS......Page 38
PV Limits......Page 39
Solution......Page 40
Solution......Page 42
Calculation of Reaction Forces......Page 45
Solution......Page 46
Solution......Page 47
Problems......Page 48
2.1 INTRODUCTION......Page 50
2.2 SIMPLE SHEAR FLOW......Page 51
2.3 BOUNDARY CONDITIONS OF FLOW......Page 53
2.4.2 cgs Units......Page 54
2.5 VISCOSITY-TEMPERATURE CURVES......Page 55
2.6 VISCOSITY INDEX......Page 57
2.7 VISCOSITY AS A FUNCTION OF PRESSURE......Page 58
2.9 VISCOELASTIC LUBRICANTS......Page 60
Problems......Page 61
3.1 INTRODUCTION......Page 64
3.2 CRUDE OILS......Page 65
3.3.1 Viscosity Index......Page 66
3.4 SYNTHETIC OILS......Page 67
3.4.1 Poly- alpha Olefins ( PAOs)......Page 68
3.4.3 Polyalkylene Glycols ( PAGs)......Page 69
3.4.5 Summary of Advantages of Synthetic Oils......Page 72
3.5 GREASES......Page 73
3.5.1 Grease Groups......Page 74
3.6.1 Additives to Improve the Viscosity Index......Page 75
3.6.1.1 Viscosity^ Shear E ¡ ects......Page 76
3.6.2 Oxidation Inhibitors......Page 77
3.6.4 Antifriction Additives......Page 78
3.6.6 Antiwear Additives......Page 80
3.6.7 Corrosion Inhibitors......Page 81
Problems......Page 82
4.1 INTRODUCTION......Page 84
4.2 ASSUMPTIONS OF HYDRODYNAMIC LUBRICATION THEORY......Page 86
4.4 DIFFERENTIAL EQUATION OF FLUID MOTION......Page 89
Solution......Page 91
Solution......Page 94
4.6.2 Plane- Slider......Page 96
4.8 VISCOUS FRICTION FORCE IN A PLANE-SLIDER......Page 98
Example Problem 4- 3......Page 99
Solution......Page 100
4.10 FLUID FILM BETWEEN A CYLINDER AND A FLAT PLATE......Page 101
4.10.2 Pressure Wave......Page 102
4.11 SOLUTION IN DIMENSIONLESS TERMS......Page 103
Ice Sled......Page 104
Solution......Page 106
Problems......Page 109
5.1 NAVIER^ STOKES EQUATIONS......Page 111
5.2 REYNOLDS HYDRODYNAMIC LUBRICATION EQUATION......Page 114
5.3 WIDE PLANE- SLIDER......Page 120
5.4 FLUID FILM BETWEEN A FLAT PLATE AND A CYLINDER......Page 121
5.5 TRANSITION TO TURBULENCE......Page 122
Solution......Page 124
Solution......Page 126
5.6 CYLINDRICAL COORDINATES......Page 127
Example Problem 5- 3......Page 128
Solution......Page 129
Example Problem 5- 4......Page 131
Problems......Page 132
6.1 INTRODUCTION......Page 135
6.2 REYNOLDS EQUATION FOR A JOURNAL BEARING......Page 137
6.3 JOURNAL BEARING WITH ROTATING SLEEVE......Page 138
6.4 COMBINED ROLLING AND SLIDING......Page 139
6.5 PRESSURE WAVE IN A LONG JOURNAL BEARING......Page 142
6.6 SOMMERFELD SOLUTION OF THE PRESSURE WAVE......Page 144
6.7 JOURNAL BEARING LOAD CAPACITY......Page 146
6.8 LOAD CAPACITY BASED ON SOMMERFELD CONDITIONS......Page 148
6.9 FRICTION IN A LONG JOURNAL BEARING......Page 149
6.11 SOMMERFELD NUMBER......Page 151
6.12 PRACTICAL PRESSURE BOUNDARY CONDITIONS......Page 152
Solution......Page 154
Solution......Page 160
Problems......Page 162
7.1 INTRODUCTION......Page 164
7.2 SHORT- BEARING ANALYSIS......Page 166
7.4 SOMMERFELD NUMBER OF A SHORT BEARING......Page 170
7.5 VISCOUS FRICTION......Page 171
Example Problem 7- 1......Page 172
Example Problem 7- 2......Page 173
Solution......Page 174
Problems......Page 176
8.1 INTRODUCTION......Page 178
8.2 DESIGN PROCEDURE......Page 179
8.3 MINIMUM FILM THICKNESS......Page 180
8.4.1 Partial Bearings......Page 181
8.4.2 Dimensionless Performance Parameters......Page 182
8.5.1 Estimation of Temperature Rise......Page 198
Solution......Page 199
8.5.2 Temperature Rise Based on the Tables of Raimondi and Boyd......Page 201
Solution......Page 202
Solution......Page 203
8.5.4 Accurate Solutions......Page 204
8.6 PEAK TEMPERATURE IN LARGE, HEAVILY LOADED BEARINGS......Page 205
8.7 DESIGN BASED ON EXPERIMENTAL CURVES......Page 207
8.7.1 Friction Curves......Page 208
Transition from Mixed to Hydrodynamic Lubrication......Page 209
Problems......Page 211
9.1 INTRODUCTION......Page 213
9.2 HYDRODYNAMIC BEARING WHIRL......Page 214
9.3 ELLIPTICAL BEARINGS......Page 215
9.4 THREE- LOBE BEARINGS......Page 216
9.5 PIVOTED- PAD JOURNAL BEARING......Page 217
9.6 BEARINGS MADE OF COMPLIANT MATERIALS......Page 219
9.7 FOIL BEARINGS......Page 220
9.8 ANALYSIS OF A FOIL BEARING......Page 221
Solution......Page 223
9.9 FOIL BEARINGS IN HIGH- SPEED TURBINES......Page 224
9.10 DESIGN EXAMPLE OF A COMPLIANT BEARING......Page 226
Problems......Page 227
10.1 INTRODUCTION......Page 229
Example Problem 10- 1......Page 231
Solution......Page 232
10.4 POWER LOSSES IN THE HYDROSTATIC PAD......Page 235
10.5 OPTIMIZATION FOR MINIMUM POWER LOSS......Page 236
Solution......Page 237
10.6 LONG RECTANGULAR HYDROSTATIC BEARINGS......Page 239
10.7 MULTIDIRECTIONAL HYDROSTATIC SUPPORT......Page 240
10.8.1 Constant- Flow- Rate Pad Sti ¡ ness......Page 243
Solution......Page 245
Solution......Page 247
10.9 CONSTANT- PRESSURE- SUPPLY PADS WITH RESTRICTORS......Page 250
10.9.1 Flow Restrictors and Bearing Sti ¡ ness......Page 251
10.10 ANALYSIS OF STIFFNESS FOR A CONSTANT PRESSURE SUPPLY......Page 252
Stiffness of a Circular Pad with Constant Supply Pressure......Page 255
Solution......Page 256
Solution......Page 258
10.11 JOURNAL BEARING CROSS- STIFFNESS......Page 260
10.13 HYDRAULIC PUMPS......Page 261
10.14.1 Hydraulic Power and Pump E/ ciency......Page 265
10.14.2 Hydraulic Power......Page 268
10.16 CASE STUDY: HYDROSTATIC SHOE PADS IN LARGE ROTARY MILLS......Page 269
10.16.1 Self- Aligning and Self- Adjusted Hydrostatic Shoe Pads......Page 273
10.16.2 Advantages of Self- Aligning Hydrostatic Shoe Pads......Page 280
Problems......Page 281
11.1 FUNDAMENTAL PRINCIPLES OF TRIBOLOGY......Page 284
11.1.1 Adhesion Friction......Page 285
11.1.2 Compatible Metals......Page 286
11.1.3 Coulomb Friction Laws......Page 287
11.2.1 Adhesive Wear......Page 290
11.2.4 Corrosion Wear......Page 291
11.3 SELECTION OF BEARING MATERIALS......Page 292
11.3.3 Corrosion Resistance......Page 293
11.3.7 Porosity......Page 294
11.3.12 Manufacturing......Page 295
11.4.1 White Metal: Tin- and Lead- Based Alloys ( Babbitts)......Page 296
11.4.3 Copper^ Lead Alloys......Page 298
11.4.6 Aluminum Alloys......Page 299
11.5.1 Plastic Bearing Materials......Page 300
11.5.1.1 Thermoplastics vs. Thermosets......Page 302
11.5.1.2 Solid Lubricant Additives......Page 303
11.5.1.3 Advantages of Plastic Bearings......Page 304
11.5.1.4 Disadvantages of Plastic Bearings......Page 305
11.5.1.5 PTFE (Teflon)......Page 306
11.5.1.6 Nylon......Page 309
11.5.1.7 Phenolics......Page 311
11.5.1.8 Polyamide ( Polyphenelen Sul ¢ de)......Page 312
11.5.1.9 Acetal......Page 313
11.5.2 Ceramic Materials......Page 315
11.5.2.1 Hot Isostatic Pressing ( HIP)......Page 317
11.5.2.2 Engineering Ceramics......Page 318
11.5.2.3 Ceramics for Plain Bearings......Page 320
11.5.3.3 Wood......Page 322
Problems......Page 323
12.1.1 Advantages of Rolling- Element Bearings......Page 325
12.1.4 Rolling Contact Stresses......Page 326
12.1.5 Misalignment......Page 330
12.2.1.1 Deep- Groove Ball Bearing......Page 331
12.2.1.2 Self- Aligning Ball Bearings......Page 332
12.2.1.3 Double- Row Deep- Groove Ball Bearing......Page 333
12.2.1.4 Angular Contact Ball Bearing......Page 334
12.2.2.2 Tapered Roller Bearing......Page 335
12.2.2.3 Multirow Tapered Roller Bearings......Page 337
12.2.2.4 Needle Roller Bearing......Page 338
12.2.2.5 Self- Aligning Spherical Roller Bearing......Page 339
12.3 HERTZ CONTACT STRESSES IN ROLLING BEARINGS......Page 340
12.4 THEORETICAL LINE CONTACT......Page 341
12.4.1 Effective Length......Page 342
12.4.2 Equivalent Radius......Page 343
12.4.4 Subsurface Stress Distribution......Page 345
Solution......Page 346
12.5.1 Race and Ball Conformity......Page 348
12.5.2 Equivalent Radius in Ball Bearing Contacts......Page 349
12.5.3 Stresses and Deformation in an Ellipsoidal Contact......Page 351
12.5.4 Ellipsoidal Contact Area Radii......Page 352
12.5.5 Subsurface Shear......Page 353
Maximum Contact Pressure in a Deep- Groove Ball Bearing......Page 354
Solution......Page 355
12.6.1 Velocity of the Rolling- Element Center......Page 357
12.6.3 Rolling Velocity......Page 358
12.7 ELASTOHYDRODYNAMIC LUBRICATION IN ROLLING BEARINGS......Page 359
12.8 ELASTOHYDRODYNAMIC LUBRICATION OF A LINE CONTACT......Page 362
Calculation of Oil Film Thickness in a Cylindrical Roller Bearing......Page 363
Solution......Page 364
Elastohydrodynamic Fluid Film in a Cam and a Follower......Page 366
Solution......Page 367
12.9 ELASTOHYDRODYNAMIC LUBRICATION OF BALL BEARINGS......Page 368
Solution......Page 370
a. Maximum Contact Pressure......Page 372
Ceramic Rolling Elements......Page 375
a. Maximum Pressure at the Outer Race......Page 376
12.10 FORCE COMPONENTS IN AN ANGULAR CONTACT BEARING......Page 378
Solution......Page 380
Example Problem 12- 9......Page 382
Solution......Page 383
Solution......Page 388
Problems......Page 392
13.1 INTRODUCTION......Page 395
13.1.1 Static Load......Page 396
13.1.3 Static Equivalent Load......Page 405
13.1.5 Static Thrust Equivalent Load......Page 406
13.2.1 Fatigue Life,......Page 407
13.2.3 Combined Radial and Thrust Loads......Page 408
13.2.4 Life Adjustment Factors......Page 409
13.3 BEARING OPERATING TEMPERATURE......Page 412
13.3.1 Estimation of Bearing Temperature......Page 414
13.3.2 Operating Temperature of the Oil......Page 415
13.4.1 Objectives of Lubrication......Page 416
13.4.2 Elastohydrodynamic Lubrication......Page 418
13.4.3 Selection of Liquid Lubricants......Page 419
Calculation of Minimum Viscosity......Page 420
Solution......Page 421
Solution......Page 424
13.5 BEARING PRECISION......Page 428
13.5.2 Outer Ring Run- Out......Page 429
13.6 INTERNAL CLEARANCE OF ROLLING BEARINGS......Page 431
13.7 VIBRATIONS AND NOISE IN ROLLING BEARINGS......Page 433
13.8 SHAFT AND HOUSING FITS......Page 435
13.9 STRESS AND DEFORMATION DUE TO TIGHT FITS......Page 446
13.9.2 Reduction of Surface Roughness by Tight Fit......Page 448
13.9.4 Effects of Temperature Di ¡ erence Between Rings......Page 450
Calculation of Operating Clearance......Page 451
Solution......Page 452
13.10 BEARING MOUNTING ARRANGEMENTS......Page 453
13.10.1 Tandem Arrangement......Page 455
13.10.2 Bearing Seat Precision......Page 456
13.11 ADJUSTABLE BEARING ARRANGEMENT......Page 457
13.11.1.1 Apex Points Outside the Two Bearings......Page 460
13.11.1.2 Apex points between the two bearings......Page 461
13.11.2 Inner and Outer Ring Fits......Page 462
13.11.4 Machine Tool Spindles......Page 463
13.12.1 Vertical- Pump Motor ( Fig. 13- 10a)......Page 464
13.12.2 NC- Lathe Spindle......Page 465
13.12.3 Bore Grinding Spindle ( Fig. 13- 10c)......Page 466
13.12.4 Rough- turning lathe ( Fig. 13- 10d)......Page 467
13.12.6 Worm Gear Transmission ( Fig. 13- 10f)......Page 468
13.12.7 Passenger Car Differential Gear ( Fig. 13- 10g)......Page 469
13.12.8 Guide Roll for Paper Mill ( Fig. 13- 10h)......Page 470
13.12.9 Centrifugal pump ( Fig. 13- 10i)......Page 471
13.12.10 Support Roller of a Rotary Kiln ( Fig. 13- 10j)......Page 472
13.12.11 Crane Pillar Mounting ( Fig. 13- 10k)......Page 474
13.13 SELECTION OF OIL VERSUS GREASE......Page 475
13.14.1.1 Bearings Packed and Sealed for Life......Page 477
13.14.1.3 Housings with Feeding Fittings......Page 479
13.14.2 Design Examples of Bearing Housings......Page 480
13.14.2.2 Grease- Quantity Regulators......Page 481
13.14.2.3 Grease Chamber......Page 482
13.14.2.5 Regulating Disk......Page 483
13.15 GREASE LIFE......Page 484
13.15.2 Topping- Up Quantity......Page 487
13.16.1 Bearing Housing with Oil Sump......Page 488
13.16.2 Lubrication with Wick Arrangement......Page 489
13.16.3 Oil Circulating Systems......Page 490
13.16.4 Oil Mist Systems......Page 491
13.16.6 Oil Replacement in Circulation Systems......Page 494
13.17 HIGH- TEMPERATURE APPLICATIONS......Page 495
13.18 SPEED LIMIT OF STANDARD BEARINGS......Page 496
13.19 MATERIALS FOR ROLLING BEARINGS......Page 497
13.19.2 Special Steels for Aerospace Applications......Page 499
13.19.2.2 M- 50NiL Bearing Steel for Aerospace Applications......Page 500
13.20 PROCESSES FOR MANUFACTURING HIGH- PURITY STEEL......Page 501
13.21 CERAMIC MATERIALS FOR ROLLING BEARINGS......Page 502
13.21.2 Silicon Nitride Bearings......Page 503
13.21.3.1 Fatigue Life of Hybrid Bearings......Page 504
13.21.4 All- Ceramic Bearings......Page 505
13.23 BEARING SEALS......Page 507
13.23.1.1 Felt Ring Seals......Page 509
13.23.1.4 Axially Acting Lip Seals......Page 510
13.23.1.6 Sealed Bearing......Page 511
13.23.2 Noncontact Seals......Page 512
Problems......Page 515
14.1 INTRODUCTION......Page 519
14.2 TESTING MACHINES FOR DRY AND BOUNDARY LUBRICATION......Page 520
14.3 FRICTION TESTING UNDER HIGH-FREQUENCY OSCILLATIONS......Page 522
14.4 MEASUREMENT OF JOURNAL BEARING FRICTION......Page 526
14.5 TESTING OF DYNAMIC FRICTION......Page 528
14.6 FRICTION- TESTING MACHINE WITH A HYDROSTATIC PAD......Page 529
14.7 FOUR- BEARINGS MEASUREMENT APPARATUS......Page 531
14.8 APPARATUS FOR MEASURING FRICTION IN LINEAR MOTION......Page 534
15.1 INTRODUCTION......Page 538
15.2 ANALYSIS OF SHORT BEARINGS UNDER DYNAMIC CONDITIONS......Page 539
15.4 SOLUTION OF JOURNAL MOTION BY FINITE- DIFFERENCE METHOD......Page 543
16.1 INTRODUCTION......Page 548
16.2 FRICTION IN HYDRODYNAMIC AND MIXED LUBRICATION......Page 549
16.2.1 Friction in Rolling- Element Bearings......Page 552
16.2.2 Dry Friction Characteristics......Page 553
16.4 DYNAMIC FRICTION......Page 554
17.1 INTRODUCTION......Page 557
17.2 DYNAMIC FRICTION MODEL FOR JOURNAL BEARINGS*......Page 559
17.3 DEVELOPMENT OF THE MODEL......Page 560
17.4 MODELING FRICTION AT STEADY VELOCITY......Page 563
17.5 MODELING DYNAMIC FRICTION......Page 565
17.6 COMPARISON OF MODEL SIMULATIONS AND EXPERIMENTS......Page 567
17.6.1 Bearing Load of 104N ( Table 17- 2, Figs. 17- 1, 17- 2, 17- 3)......Page 568
17.6.2 Bearing Under Load of 84N ( Table 17- 3, Figs. 17- 4, 17- 5, 17- 6)......Page 570
17.6.3 Conclusions......Page 571
18.1.1 Start- Up and Stopping......Page 573
18.1.3 Limitations of Rolling Bearings......Page 574
18.2 COMPOSITE- BEARING DESIGNS......Page 575
18.2.1 Friction Characteristics of the Composite Bearing......Page 577
18.2.2 Composite- Bearing Start- Up......Page 578
18.2.3 Analysis of Start- up......Page 579
18.3 PREVIOUS RESEARCH IN COMPOSITE BEARINGS......Page 580
18.4 COMPOSITE BEARING WITH CENTRIFUGAL MECHANISM......Page 581
18.4.1 Design for the Desired Rolling Speed......Page 582
18.5 PERFORMANCE UNDER DYNAMIC CONDITIONS......Page 585
18.5.1 Equations of Motion......Page 586
18.5.2 Equation of Journal Motion......Page 588
18.5.3 Comparison of Journal Locus under Dynamic Load......Page 591
18.6 THERMAL EFFECTS......Page 593
18.6.1 Thermal Solution for Stationary and Rotating Sleeves......Page 594
19.1 INTRODUCTION......Page 599
19.2 VISCOELASTIC FLUID MODELS......Page 601
19.2.1 Viscoelastic Model for High Shear- Rate Flows......Page 602
19.3 ANALYSIS OF VISCOELASTIC FLUID FLOW......Page 603
19.3.2 Solution of the Di ¡ erential Equation of Flow......Page 605
19.4.1 Improvements in Lubrication Performance of Journal Bearings......Page 607
19.5 SQUEEZE- FILM FLOW......Page 609
19.5.1 Conclusions......Page 612
20.1 INTRODUCTION......Page 613
20.2 ARTIFICIAL HIP JOINT AS A BEARING......Page 615
20.3 HISTORY OF THE HIP REPLACEMENT JOINT......Page 616
20.4.1 Ceramics......Page 618
20.5 DYNAMIC FRICTION......Page 619
Bibliography......Page 622
A. 1 UNIT SYSTEMS......Page 631
A. 2.2 Specific Weight,......Page 632
A. 2.6 Absolute Viscosity,......Page 633
A. 2.7 Kinematic Viscosity,......Page 634
B. 1 MIDPOINT RULE......Page 635
B. 2 RECTANGLE RULE ( FIG. B- 2)......Page 636
B- 4 SIMPSON RULE ( FIG. B- 4)......Page 637
Solution......Page 638


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