秸稈、土壤和圓盤犁之間的相互作用機(jī)理是當(dāng)今農(nóng)業(yè)工程領(lǐng)域的一個(gè)重要研究方向。傳統(tǒng)耕地作業(yè)過(guò)程中,主要面臨秸稈、土壤和圓盤犁之間交互作用與影響、土壤對(duì)農(nóng)機(jī)具的高阻抗性以及能源消耗等問(wèn)題。提高耕作機(jī)械和土壤處理機(jī)械能源利用效率,降低其能源消耗是國(guó)內(nèi)外廣泛關(guān)注的熱點(diǎn)問(wèn)題。同時(shí)在中國(guó),水田環(huán)境下秸稈、土壤和農(nóng)機(jī)具相互作用機(jī)理研究也還處于起步階段。本課題研究了圓盤耕犁在3種不同耕作速度（1.25ms-1,1.98ms-1和2.47ms-1）和不同耕深（5cm、10cm和15cm）下的工作性能。試驗(yàn)在一個(gè)覆蓋了水稻和小麥秸稈的156m2的土槽進(jìn)行。在整個(gè)試驗(yàn)過(guò)程中,土壤的水分含量和密度保持恒定不變。研究結(jié)果總結(jié)如下：1、在3種不同的加載速率（15mm min-1,20mm min-1和25mm min-1）和3個(gè)內(nèi)部測(cè)量點(diǎn)（N1居上、N2居中、N3居下）分別對(duì)稻麥秸稈的機(jī)械特性,如剪切強(qiáng)度、特定剪切能量、彎曲強(qiáng)度和切削力等,進(jìn)行了測(cè)定。試驗(yàn)結(jié)果表明,裝載速率越高,兩種秸稈在第3個(gè)內(nèi)部測(cè)量點(diǎn)的剪切強(qiáng)度、特定剪切能量和切削力越大。水稻秸稈的剪切強(qiáng)度、特定剪切能量和切削力也明顯比小麥秸稈大。同時(shí),當(dāng)裝載速... 

【文章來(lái)源】：南京農(nóng)業(yè)大學(xué)江蘇省211工程院校教育部直屬院校

【文章頁(yè)數(shù)】：151 頁(yè)

【學(xué)位級(jí)別】：博士

【文章目錄】：
ABBRIVATIONS
ABSTRACT
摘要
CHAPTER 1 INTRODUCTION
    1.1 Back Ground
    1.2 Significanoe of research
    1.3 Review Literature
        1.3.1 Effect of tillage practices on straw incorporation soil
        1.3.2 Physical and mechanical properties of soil
        1.3.3 Horizontal forces of tillage tool
        1.3.4 Vertical forces of tillage tool
        1.3.5 Soil disturbance and soil failure geometry by tillage tool
        1.3.6 Soil bulk density influenced by tillage tool
        1.3.7 Soil and straw movement by tillage
        1.3.8 Relationship of draft and speed
        1.3.9 Relationship of draft and depth
        1.3.10 Soil-Bins Indoor and outdoor
    1.4 Objectives of the research
    1.5 Layout of the dissertation
    REFERENCES
CHAPTER 2 MATERIALS AND METHODS
    2.1 Mechanical characteristics of straw
        2.1.1 Experimental method and design
        2.1.2 Moisture content of straw
        2.1.3 Straw internode preparation
        2.1.4 Test equipment
        2.1.5 Fabrication of shear box and loading plate
        2.1.6 Shear,cutting and bending tests
        2.1.7 Statistical analysis
    2.2 Soil-bin experiments were categorized by two approaches
        2.2.1 Experimental design
        2.2.3 Testing facilities and soil-bin preparation
        2.2.4 Soil Preparation
        2.2.5 Measurements of scil properties
        2.2.6 Soil moisture content
        2.2.7 Soil bulk density
        2.2.8 Direct Shear test
        2.2.9 Assembling of disc tool and transducer placement
        2.2.10 Soil cone index
        2.2.11 Soil disturbance area and furrow profile
        2.2.12 Soil and straw movement
        2.2.13 Burial straw measurements
        2.2.14 Transducer calibration and data acquisition system
        2.2.15 Statistically analysis
    REFERENCES
CHAPTER 3 EFFECT OF LOADING RATES ON MECHANICAL CHARACTERISTICS OFWHEAT AND RICE STRAW
    3.1 Introduction
    3.2 Results and discussion
        3.2.1 Effect of loading rate on shear strength
        3.2.2 Effect of loading rate on specific shearing energy
        3.2.3 Effect of loading rate on cutting force of straw
        3.2.4 Effect of loading rate on bending strength
        3.2.5 Effect of loading rate on shearing energy
        3.2.6 Effect of loading rate on young's modulus
    3.3 Conclusions
    REFERENCES
CHAPTER 4 STRAW-SOIL-TILLAGE TOOL INTERACTION:A CASE STUDY FOR DISCTOOL
    4.1 Introduction
    4.2 Experimental design and statistical analysis
    4.3 Result and discussion
        4.3.1 Forces acting on disc tool
        4.3.2 Burial straw after disc tillage tool
        4.3.3 Soil bulk density influenced by disc tool
        4.3.5 Soil disturbance area and furrow profile
    4.4 Conclusions
    REFERENCES
CHAPTER 5 STRAW AND SOIL MOVEMENT UNDER DIFFERENT WORKING DEPTHSAND SPEEDS OF DISC TOOL
    5.1 Introduction
    5.2 Results and Discussions
        5.2.1 Lateral and longitudinal soil movement at different speeds and depths
        5.2.2 Lateral and longitudinal straw movement at different speed and depths by disc tillage tool
    5.4 Conclusions
    REFERENCES
CHAPTER 6 SIMULATION AND MODELING OF STRAW-SOIL-DISC TOOL THROUGHEDEM
    6.1 Introduction
    6.2 Discrete element constitutive model and calculation principles
    6.3 Result and discussion
    6.4 Conelusions
    REFERENCES
CHAPTER 7 CONCLUSIONS AND RECOMMENDATIONS
    7.1 Conclusions
        7.1.1 Mechanical characteristics properties of straw
        7.1.2 Straw-soil-disc toolinteraction
        7.1.3 Soil and straw movement
        7.1.4 Simulation of straw-soil-disc tool by EDEM
    7.2 Recommendations
PHOTOGRAPHS
RESEARCH PAPERS
ACKNOWLEDGEMENTS
DEDICATION


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