Investigation of Stress Distribution in a Dragline Bucket Using Finite Element Analysis

رسالة ماجستير بعنوان
Investigation of Stress Distribution in a Dragline Bucket Using Finite Element Analysis
A Thesis Submitted to
The Graduate School of Applied and Natural Sciences
Of Middle East Technical University
By
Onur Gölbaġi
In Partial Fulfillment of the Requirements
For
The Degree of Master of Science
In
Mining Engineering
Table of Content
Abstract. Iv
Öz. Vi
Acknowledgments Ix
Table of Content. X
List of Tables Xiii
List of Figures Xiv
Nomenclature Xvii
Chapters
1 Introduction . 1
1.1 General Remarks 1
1.2 Statement of the Problem . 3
1.3 Objectives and Scope of the Study 4
1.4 Research Methodology . 4
1.5 Outline of the Thesis 6
2 LITERATURE SURVEY 8
2.1 An Overview of Walking Draglines 8
2.2 Dragline Productivity Factors . 11
2.3 Dragline Productivity Studies . 13
2.3.1 Dragline Productivity Studies through Mine Planning and Working
Schedules 14
2.3.2 Dragline Productivity Studies through Operator Training . 15
2.3.3 Dragline Productivity Studies through Improving Machinery Parts 16
2.4 Finite Element Applications for Earthmoving Activities . 22
2.4.1 General Information about Finite Element Analysis . 22
2.4.2 FEA Applications for Earthmoving Actions . 23
2.5 Earthmoving Action of a Dragline Bucket within the Formation . 25
2.6 Tool-Formation Cutting Resistance Models for Earthmoving Activities . 27
2.6.1 Background on the Cutting Resistance Models 28
2.6.2 Empirical Approaches for the Cutting Resistance Models 29xi
2.6.3 Analytical Approaches for the Cutting Resistance Models . 30
2.6.4 Cutting Resistance Model Applications 35
2.7 Summary of the Literature Review . 36
3 SOLID MODELLING OF DRAGLINE BUCKET 38
3.1 Computer-Aided Design of a Dragline Bucket 38
3.2 Geometry of Main Bucket Body and Tooth 39
3.3 Geometry of Dragline Bucket Rigging Mechanism . 45
4 DIGGING SIMULATION OF WALKING DRAGLINE BUCKET 55
4.1 Resistive Force Calculations . 55
4.1.1 Formation Specifications . 55
4.1.2 Cutting Force Calculation 56
4.2 Pre-processing Steps in the Simulation Environment 64
4.2.1 Transferring the CAD Model into the Simulation Environment 64
4.2.2 Material Property Assignment 66
4.2.3 Element Type Selection and Creating Mesh . 68
4.2.4 Determination of Analysis Type 71
4.3 Case Studies and Loading-Boundary Conditions 72
4.4 Sensitivity Analysis for the Formation Specifications in Stress
Investigation . 74
5 RESULTS AND DISCUSSIONS 77
5.1 Case-1: Stress Investigation on a Stable Dragline Bucket . 77
5.2 Case-2: Stress Investigation on a Moving Dragline Bucket . 81
5.3 Sensitivity Analysis for Formation Parameters . 88
6 CONCLUSIONS AND RECOMMENDATIONS . 90
6.1 Introduction 90
6.2 Conclusions 91
6.3 Recommendations 92
7 REFERENCES 93
APPENDICES
A. N-FACTORS IN THE UNIVERSAL EARTHMOVING EQUATION .101xii
B. NORMAL PRESSURE CALCULATIONS FOR THE SENSITIVITY
ANALYSIS
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