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Design and Performance Evaluation of Furrow Opener for Constructing Trapezoidal Shaped Furrow in Permanent Raised Bed Cropping Systems

LIST OF CONTENTS第5-8页
LIST OF FIGURES第8-10页
LIST OF TABLES第10-11页
ABSTRACT第11-12页
CHAPTER I INTRODUCTION第13-17页
CHAPTER Ⅱ:LITERATURE REVIEW第17-32页
    2.1 Tillage and Soil mechanics第17页
    2.2 Earth pressure theories第17-18页
    2.3 Classical soil mechanics and soil cutting第18-19页
    2.4 Analytical models第19-28页
        2.4.1 Limit equilibrium method(LEM)第19-20页
        2.4.2 Universal earthmoving equation第20-21页
        2.4.3 Payne model第21-22页
        2.4.4 O'cllaghan-Farrely model第22-23页
        2.4.5 Hettiaratchi-Reece model第23-24页
        2.4.6 Godwin-Spoor model第24-26页
        2.4.7 Mckyes and Ali model第26-27页
        2.4.8 Grisso et al.model第27-28页
        2.4.9 Weaknesses of analytical models第28页
    2.5 FEM models第28-32页
        2.5.1 Chi and Kushwaha model第29页
        2.5.2 Araya and Gao model第29页
        2.5.3 Mouazen and Nemenyi model第29页
        2.5.4 Fielke model第29-30页
        2.5.5 Jafari et al.Model第30-32页
CHAPTER Ⅲ:SOIL DESCRIPTION AND PROPERTIES第32-46页
    3.1 Soil textural classification第32页
    3.2 Bulk density第32-33页
    3.3 Soil moisture content第33页
    3.4 Mechanical properties of soil and soil-tool interface第33-46页
        3.4.1 Determination of soil shear strength properties第34-38页
        3.4.2 Determination of soil stiffness properties第38-41页
        3.4.3 Determination of soil-metal interface mechanical properties第41-46页
CHAPTER Ⅳ:FINITE ELEMENT METHOD SIMULATION第46-71页
    4.1 Theory of the Drucker-Prager elastic-perfectly plastic material model第46-50页
    4.2 Finite element formulation and virtual work第50-53页
    4.3 Building of the FEM model第53-60页
        4.3.1 Generation of soil-blade interface model geometry第53-55页
        4.3.2 Setting the type of analysis to be used第55页
        4.3.3 Specification of the element type第55-56页
        4.3.4 Selection of units第56页
        4.3.5 Definition of material properties第56页
        4.3.6 Specifying the material model behavior第56-57页
        4.3.7 Meshing of the soil-blade interface model第57-58页
        4.3.8 Setting of the contact mechanism between blade and soil第58-59页
        4.3.9 Application of boundary conditions第59-60页
    4.4 Solution of the FEM model第60-61页
        4.4.1 Solution of material and geometrical non-linearities第61页
    4.5 Display of FEM model results第61页
    4.6 Results of the FEM simulation第61-71页
        4.6.1 Trapezoidal flat blade (TFB) draft forces第61-67页
        4.6.2 Soil displacement field第67-68页
        4.6.3 Blade stresses第68-71页
CHAPTER Ⅴ:DESIGN AND DEVELOPMENT OF FURROW OPENER 59 PROTOTYPE第71-78页
    5.1 Furrow opener prototype parts第71-78页
        5.1.1 Lower frog第71-72页
        5.1.2 Trapezoidal Flat Blade (TFB)第72-73页
        5.1.3 Upper frog第73-74页
        5.1.4 Moldboards第74-75页
        5.1.5 Furrow opener shank第75-78页
CHAPTER Ⅵ:SOIL BIN EXPERIMENTS第78-90页
    6.1 Soil bin description第78-80页
    6.2 Soil preparation第80-83页
    6.3 Experimentation第83-86页
        6.3.1 Tests procedure第83-84页
        6.3.2 Instrumentation第84-86页
    6.4 Soil bin experimental results第86-90页
        6.4.1 Furrow opener(tool)forces第86-90页
CHAPTER Ⅶ:CONCLUSIONS AND RECOMMENDATIONS第90-93页
    7.1 Conclusions第90-91页
    7.2 Recommendations and future perspectives第91-93页
ACKNOWLEDGEMENT第93-95页
REFERENCES第95-104页
APPENDIX A:ANSYS SOFTWARE RUNNING PROCEDURE第104-107页

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