COAL: PROPERTIES AND APPLICATIONS
1 Introduction 1 11 Brief Introduction of DEM 1 12 The Development History of DEM 2 13 Basic Theory of DEM 4 131 Contact Theory of DEM 4 132 Particle Contact Search 11 133 Calculation of Particle Motion State 11 134 Determination of Time Step 12 14 Development Trend of DEM 13 141 Development of Theoretical Research 13 142 Improvement of Operation Efficiency 13 143 Multi-field Application 13 144 Software Development 14 145 Multi-algorithm Coupling Analysis 14 15 Parameter Calibration of DEM 15 151 Direct Measurement of the Test 15 152 Test-Simulation Combined Calibration Method 16 References 17 2 Application of DEM in Coal and Agricultural Machinery 21 21 Application of DEM in Coal Machine Equipment 21 211 Transportation Machinery 21 212 Mining Machinery 23 213 Other Coal Machine Equipment 24 22 Application of DEM in Agricultural Machinery Equipment Ripper 25 221 Loose Machinery 25 222 Seeding Machinery 27 223 Harvesting Machinery 28 224 Other Agricultural Machinery 29 References 30 3 Analysis of the Coal Bulk Transport State Based on DEM 35 31 EDEM Simulation Model Construction 35 311 Scraper Conveyor Model 35 312 Coal Bulk Model 36 32 EDEM Simulation Analysis of Transportation State Under Complex Conditions 37 321 Stable and Start-Stop Working Conditions 37 322 Material Accumulation Conditions 40 323 Gangue-Containing Working Conditions 42 324 Bottom Plate Tilting Condition 45 325 Viscosity Change Condition of Coal Bulk 46 33 Distribution and Movement State of Coal Bulk 47 331 Distribution State of Coal Bulk 47 332 Movement State of Coal Bulk 50 Reference 56 4 Mechanical Effect of Scraper Conveyor Based on DEM 57 41 EDEM Simulation Analysis of Bulk Load Characteristics 57 411 Reconstruction of Scraper Conveyor Model 57 412 Load Characteristics of Coal Bulk Under Normal Working Conditions 58 413 Load Characteristics of Coal Bulk Under Complex Working Conditions 60 42 EDEM Simulation Analysis of the Force Features of the Middle Trough of the Scraper Conveyor 64 421 Up and Down Hill Conditions 64 422 The Middle Trough Tilts the Condition in the Direction of the Push 68 423 Different Capacity Conditions 69 424 Ledge Local Accumulation Conditions 70 43 EDEM Simulation Analysis of Contact Mechanics and Wear Between the Coal Bulk and the Middle Trough 72 431 Theoretical Analysis of Contact Mechanics 72 432 Analysis of the Wear Mechanism of the Middle Trough 78 433 Analysis of the Wear Law of the Middle Trough 79 References 82 5 Application of DEM on the Design of Wear-Resistant Bionic Chute of Scraper Conveyor 83 51 Geometric Structure Characteristics of Wear-Resistant Organism Surface 83 511 Selection of Biological Geometric Structure Surface and Bionic Model 83 512 Pit-Shaped Biological Non-smooth Geometric Structure Surface 84 52 Optimization of Wear-Resistant Structure of Pit-Type Non-smooth Surface 88 521 Test Conditions and Methods 88 522 Bionic Middle Plate Design and Preparation 88 523 Optimize Test Design 90 524 Experimental Results and Analysis 91 525 Verification and Comparative Test of Bionic Middle Plate with Optimal Structure 95 53 EDEM Simulation Analysis of the Wear-Resistant Mechanism of Bionic Middle Plate with Optimal Structure 97 531 Research on Wear Mechanism Based on Wear Morphology 97 532 Research on Wear Resistance Mechanism of EDEM-RecurDyn Coupled Simulation 100 References 102 6 Flowing State Analysis of Coal Bulk in Silos Using DEM 103 61 Construction of DEM Model for Silo-Coal Particle Interaction 103 611 Coal Particle Model 103 612 Silo Model 104 613 Contact and Flow Model 105 62 Simulation Analysis of Bulk Material Flow State in Silo by DEM 106 621 Flow State Simulation 106 622 Factors Affecting Flow Status 109 63 Simulation of DEM for Bulk Material Flow in Coal Silo Unloading Hopper 114 631 Hopper Discharge Theory 114 632 Simulation Analysis of Loading and Unloading 118 References 121 7 Stress Analysis of Silos Using DEM 123 71 Silo Boundary Conditions and Loading and Unloading Material Simulation 124 72 Simulation Analysis of Static Dynamic Pressure 126 721 The Classic Theory of Coal Barn Pressure 126 722 Static and Dynamic Pressure Analysis 129 73 Overpressure Discrete Element Simulation Analysis 131 74 Test Verification 132 741 Test Device 132 742 Test Schemes 134 743 Analysis of Results 136 References 138 8 Application of DEM on the Design and Performance Analysis of Bionic Subsoiler 139 81 PFC3D Simulation Model 139 811 Black Bear Claw Model 139 812 Soil Particle Model 141 82 Soil Parameter Calibration 142 821 Calibration Scheme Design 142 822 Influencing Factors and Measuring Methods 143 823 Soil Particle Correction Results 147 83 Analysis of Claw–Soil Interaction 148 831 Claw–Soil Interaction Model 148 832 Claw–Soil Interaction Results 149 84 Design of Bionic Subsoiler and Study on Subsoiling Effect 153 841 Design of Bionic Subsoiler 153 842 PFC3D Simulation Analysis of Subsoiling Effect 154 References 157 9 The Effect of Two Wings of Subsoiler on Tillage Based on DEM 159 91 The Subsoiling Tool and the Soil Parameters in PFC3D 160 911 Description of the Subsoiling Tools 160 912 Soil Particles and Parameters 161 913 Validation of the Model 162 92 Virtual Test of the Two Design Alternatives Using PFC3D 162 921 Comparison of the Two Design Alternatives 165 922 Kinetic Energy of Soil Particles 168 References 170 10 Conclusion and Prospect 173 101 Work Summary 173 102 Main Conclusions 174 103 Prospect 176