کتاب جالب ترامکانیک (مکانیک ماشین های غیر جاده ای) Terramechanics

اختصاصی از یاری فایل کتاب جالب ترامکانیک (مکانیک ماشین های غیر جاده ای) Terramechanics دانلود با لینک مستقیم و پر سرعت .

CHAPTER 1 INTRODUCTION 1

1. 1 General 1
2. 2 Mechanics of Soft Terrain 2
3. 2.1 Physical properties of soil 3
4. 2.2 Compressive stress and deformation characteristics 6
5. 2.3 Shear stress and deformation characteristics 8
6. 3 Mechanics of Snow Covered Terrain 19
7. 3.1 Physical properties of snow 19
8. 3.2 Compressive stress and deformation characteristics 22
9. 3.3 Shear stress and deformation characteristics 26
10. 4 Summary 29

References 31

Exercises 33

CHAPTER 2 RIGIDWHEEL SYSTEMS 35

1. 1 At Rest 36
2. 1.1 Bearing capacity of weak terrain 36
3. 1.2 Contact pressure distribution and amount of sinkage 36
4. 2 At Driving State 39
5. 2.1 Amount of slippage 39
6. 2.2 Soil deformation 40
7. 2.3 Force balances 45
8. 2.4 Driving force 47
9. 2.5 Compaction resistance 51
10. 2.6 Effective driving force 53
11. 2.7 Energy equilibrium 54
12. 3 At Braking State 55
13. 3.1 Amount of slippage 55
14. 3.2 Soil deformation 56
15. 3.3 Force balances 59
16. 3.4 Braking force 61
17. 3.5 Compaction resistance 65
18. 3.6 Effective braking force 67
19. 3.7 Energy equilibrium 67
20. 4 Simulation Analysis 68
21. 4.1 Driving state 70
22. 4.2 Braking state 74

CHAPTER 3 FLEXIBLE-TIREWHEEL SYSTEMS 83

1. 1 Tire Structure 84
2. 2 Static Mechanical Characteristics 86
3. 3 Dynamic Mechanical Properties 91
4. 3.1 Hard terrain 91
5. 3.2 Soft terrain 94
6. 4 Kinematic Equations of a Wheel 109
7. 5 Cornering Characteristics 112
8. 6 Distribution of Contact Pressure 116
9. 7 Summary 119

References 119

Exercises 120

CHAPTER 4 TERRAIN-TRACK SYSTEM CONSTANTS 123

1. 1 Track Plate Loading Test 124
2. 2 Track Plate Traction Test 124
3. 3 Some Experimental Results 127
4. 3.1 Effects of variation in grouser pitch-height ratio 127
5. 3.2 Results for a decomposed granite sandy terrain 130
6. 3.3 Studies on pavement road surfaces 131
7. 3.4 Scale effects and the model-track-plate test 134
8. 3.5 Snow covered terrain 144
9. 4 Summary 145

References 146

Exercises 146

CHAPTER 5 LAND LOCOMOTION MECHANICS FOR 149

A RIGID-TRACKVEHICLE

1. 1 Rest State Analysis 149
2. 1.1 Bearing capacity of a terrain 149
3. 1.2 Distribution of contact pressures and amounts of sinkage 150

(1) For the case where sf 0 ≥ H, sr0 ≥ H 152

(2) For the case where 0 ≤ sf 0 < H < sr0 153

(3) For the case where sf 0 > H > sr0 ≥ 0 154

(4) For the case where sf 0 < 0 < H < sr0 155

(5) For the case where sf 0 > H > 0 > sr0 156

1. 2 Driving State Analysis 158
2. 2.1 Amount of vehicle slippage 158
3. 2.2 Force balance analysis 159
4. 2.3 Thrust analysis 162

(1) Main part of track belt 163

(2) Contact part of front-idler 165

(3) Contact part of rear sprocket 166

1. 2.4 Compaction resistance 167
2. 2.5 Energy equilibrium equation 170
3. 2.6 Effective driving force 171
4. 3 Braking State Analysis 174
5. 3.1 Amount of vehicle slippage 174
6. 3.2 Force balance analysis 175
7. 3.3 Drag 176

(1) Main part of track belt 176

(2) Contact part of the front-idler 180

(3) Part of rear sprocket 181

1. 3.4 Compaction resistance 182

(1) For the case where 0 ≥ sf 0i ≤ sr0i 182

(2) For the case where sf 0i > sr0i > 0 183

(3) For the case where sf 0i < 0 < H < sr0i 183

(4) For the case where sf 0i > H > 0 > sr0i 183

1. 3.5 Energy equilibrium analysis 183
2. 3.6 Effective braking force 184
3. 4 Experimental Validation 187
4. 5 Analytical Example 197
5. 5.1 Pavement road 197
6. 5.2 Snow covered terrain 202
7. 6 Summary 204

References 205

Exercises 206

CHAPTER 6 LAND LOCOMOTION MECHANICS OF 209

FLEXIBLE-TRACKVEHICLES

1. 1 Force System and Energy Equilibrium Analysis 209

(1) During driving action 212

(2) During braking action 212

1. 2 Flexible Deformation of a Track Belt 212
2. 3 Simulation Analysis 215
3. 3.1 At driving state 218
4. 3.2 At braking state 221
5. 4 Theory of Steering Motion 224
6. 4.1 Thrust and steering ratio 228
7. 4.2 Amount of slippage in turning motion 229
8. 4.3 Turning resistance moment 231
9. 4.4 Flow chart 232
10. 5 Some Experimental Study Results 235
11. 5.1 During self-propelling operation 235
12. 5.2 During tractive operations 238
13. 6 Analytical Example 238
14. 6.1 Silty loam terrain 239

(1) Trafficability of a bulldozer running on soft terrain 239

(2) Size effect of vehicle 246

(3) Effect of initial track belt tension 249