铧式犁作用下的水田土壤三维形变及牵引力研究
发布时间：2021-08-29 05:16
耕作过程中,牵引力、变形力和土壤应力等多种力相互作用。详细研究不同环境下力的相互作用机理有助于更好地理解耕作过程。影响上述力的因素有很多,包括土壤类型、土壤物理性质、流变性质以及湿度、速度和耕作工具形状等。本研究分析了作用在犁体表面的土壤应力和土壤变形力的空间分布。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%）条件下铧犁在水田土中作用时所受三维力,并与仿真中的力进行对比。结果归纳如下：1.在室内土槽实验中,运用两种形状的工具-圆形（横截面积12.56 cm2）和长方形（横截面积12.56 cm2）测量水田土壤在不同含水率（27,30和33%）和不同载荷（7.65,10.20和12.75 kg）下的流变参数。整个实验结果显示：土壤含水率对土壤在不同加载速率下的变形影响很大,同时合适的工具形状能控制不同载荷下的土壤变形。对于流变参数（E1, E2, λ1 and λ2）,土壤含水率对其影响很显著,而加载速率不显著。不同含水率、载荷和工具形状下,流变参数的均值差异显著。2.在传感器和虚拟仪器的协同作用下,测量了作用于铧式犁表面的11个不同点处的土...
【文章来源】：南京农业大学江苏省 211工程院校 教育部直属院校
【文章页数】：141 页
【学位级别】：博士
【文章目录】：
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
本文编号：3369986
【文章来源】：南京农业大学江苏省 211工程院校 教育部直属院校
【文章页数】：141 页
【学位级别】：博士
【文章目录】：
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
本文编号：3369986
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