耕作過程中,牽引力、變形力和土壤應(yīng)力等多種力相互作用。詳細(xì)研究不同環(huán)境下力的相互作用機(jī)理有助于更好地理解耕作過程。影響上述力的因素有很多,包括土壤類型、土壤物理性質(zhì)、流變性質(zhì)以及濕度、速度和耕作工具形狀等。本研究分析了作用在犁體表面的土壤應(yīng)力和土壤變形力的空間分布。不同耕速（1,1.5和2m.s-1）耕深（5,10和15cm）和含水率（27,30和33%）條件下鏵犁在水田土中作用時(shí)所受三維力,并與仿真中的力進(jìn)行對(duì)比。結(jié)果歸納如下：1.在室內(nèi)土槽實(shí)驗(yàn)中,運(yùn)用兩種形狀的工具-圓形（橫截面積12.56 cm2）和長(zhǎng)方形（橫截面積12.56 cm2）測(cè)量水田土壤在不同含水率（27,30和33%）和不同載荷（7.65,10.20和12.75 kg）下的流變參數(shù)。整個(gè)實(shí)驗(yàn)結(jié)果顯示：土壤含水率對(duì)土壤在不同加載速率下的變形影響很大,同時(shí)合適的工具形狀能控制不同載荷下的土壤變形。對(duì)于流變參數(shù)（E1, E2, λ1 and λ2）,土壤含水率對(duì)其影響很顯著,而加載速率不顯著。不同含水率、載荷和工具形狀下,流變參數(shù)的均值差異顯著。2.在傳感器和虛擬儀器的協(xié)同作用下,測(cè)量了作用于鏵式犁表面的11個(gè)不同點(diǎn)處的土... 

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

【文章頁數(shù)】：141 頁

【學(xué)位級(jí)別】：博士

【文章目錄】：
摘要
ABSTRACT
CHAPTER 1 INTRODUCTION
    1.1 Back Ground
    1.2 Significance of Research
    1.3 Review Literature
        1.3.1 Soil Mechanics and Interaction of Tillage Tool
        1.3.2 Mechanical Parameters of Soils
        1.3.3 Design of Tillage Tools
        1.3.4 Measurement of Draught Forces on Tillage Tool
        1.3.5 Soil Pressure and Draught Forces Measurements
        1.3.6 Measurement of Soil Draught and Depth Relationship
        1.3.7 Soil-Tool Modeling for Draught Requirement
        1.3.8 Indoor and Outdoor Facilities of Soil Bins
    1.4 Objectives of the Study
    1.5 Layout of the dissertation
    1.6 References
CHAPTER 2 MATERIALS AND METHODS
    2.1 Introduction
    2.2 Site and Treatments
    2.3 Soil Preparation
    2.4 Soil Physical Properties
        2.4.1 Soil Moisture Content
        2.4.2 Bulk Density
        2.4.3 Total Porosity
    2.5 Soil Mechanical Properties
        2.5.1 Penetration Resistance
        2.5.2 Soil Sample Preparation for Direct Shear Stress
        2.5.3 Measurement of Rheological Properties
            2.5.3.1 Working Composition of Rheometer
            2.5.3.2 Rheological Model of Paddy Field Soil
            2.5.3.3 Calculation of Rheological Parameters
    2.6 Measurement of Soil Force on the Surface of the Mouldboard Plough
    2.7 Measurements of the Three-Dimensional Draught
    2.8 Measurements of the Soil Deformation Forces in Three-Dimensional
    2.9 Electronic Control Unit
    2.10 Software Advantech
    2.11 Stati stically Analysis
    2.12 References
CHAPTER 3 RHEOLOGICAL PROPERTIES OF PADDY SOIL UNDER VARIOUSPRESSURE,WATER CONTENT AND TOOL SHAPES
    3.1 Introduction
    3.2 Results and Discussion
    3.3 Conclusions
    3.4 References
CHAPTER 4 SPATIAL DISTRIBUTION ANALYSIS OF SOIL FORCES ONMOULDBOARD PLOUGH IN COMPARISON WITH DRAUGHT FORCEREQUIRED UNDER DIFFERENT MOISTURE CONTENT AT DIFFERENT LEVELOF SPEED AND DEPTH
    4.1 Introduction
    4.2 Results and Discussion
    4.3 Soil Forces on the Surface of Mouldboard Plough
        4.3.1 Spatial Distribution of Soil forces on Share
        4.3.2 Spatial Distribution of Soil forces on Curvature
        4.3.3 Spatial Distribution of Soil forces on Lower and Upper Mould
        4.3.4 Average Soil Forces on Mouldboard Plough Parts
    4.4 Effect of Speed on Average Soil force
    4.5 Effect of Depth on Average Soil force
    4.6 Analyses of Draught Forces on Mouldboard Plough
    4.7 Conclusions
    4.8 References
CHAPTER 5 ANALYSIS THE 3-DIMENSIONAL SOIL DEFORMATION ANDDRAUGHT FORCES CAUSED BY MOULDBOARD PLOUGH IN PADDY SOIL
    5.1 Introduction
    5.2 Results and Discussions
        5.2.1 Soil Deformation Force in Three Directions (Dx, Dy and Dz)
        5.2.2 Total Draught Forces of Mouldboard Plough in Three Dimensions
        5.2.3 Resultant Draught Forces
    5.3 Conclusion
    5.4 Reference
CHAPTER 6 SIMULATION OF THE EXPERIMENTAL DATA OF DRAUGHTFORCES ON MOULDBOARD PLOUGH
    6.1 Introduction
    6.2 Discrete Element Constitute Model
    6.3 Soil-Tillage Simulation Model
    6.4 Results and Discussions
        6.4.1 Simulation Result of Draught Force on Mouldboard Plough
        6.4.2 Comparison of Experimental and Simulated Force on Mouldboard Plough
    6.5 Conclusions
    6.6 Reference
CHAPTER 7 CONCLUSIONS AND RECOMMENDATIONS
    7.1 Conclusions
        7.1.1 Mechanical and Rheological Properties of Paddy Soil
        7.1.2 Soil Forces on Surface of Moulboard Plough
        7.1.3 3-D Soil Deformation Forces Caused by Moulboard Plough
        7.1.4 3-D Draught Forces of Mouldboard Plough
        7.1.5 Simulation of 3-DraughtForces on Mouldboard Plough by EDEM
    7.2 Recommendations
Appendix
RESEARCH PAPERS
ACKNOWLEDGEMENTS



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