论文题目: 土壤机具系统仿生减摩表面设计与试验研究
论文类型: 博士论文
论文专业: 农业机械化工程
作者: 巴勒尔赛义德毛亚德
导师: 佟金
关键词: 土壤机具相互作用,开沟器,培土器,推土铲,仿生表面,计算机模拟,土壤阻力
文献来源: 吉林大学
发表年度: 2005
论文摘要: 本论文研究得到国家杰出青年科学基金( 50025516)和国家自然科学基金(50275037)资助。根据生物表面非光滑结构,分别使用钢和超高分子量聚乙烯(UHMWPE)材料对矛型播种开沟器触土表面进行仿生设计,包括凸包型、台阶型、半圆柱型及脊型。利用ANASYS 软件进行模拟分析,发现与普通和钢质仿生开沟器相比,UHMWPE材料仿生开沟器在运动方向上具较低等应力及其分布,UHMWPE材料仿生脊型开沟器具最低应力。根据黄鼠爪上轮廓曲线和生物非光滑特征,进行播种培土器和推土铲表面仿生设计及模拟分析,发现UHMWPE材料凸包及台阶型培土器和UHMWPE覆盖板型推土铲具最低应力。与普通和钢质仿生表面相比,UHMWPE材料仿生培土器和推土铲具低的等应力及其分布。利用C++程序对普通和仿生开沟器的土壤阻力和动力消耗进行了预测,并在室内土槽对普通和仿生脊型开沟器进行试验研究,证实仿生脊型开沟器具良好减阻性能。
论文目录:
CHAPTER 1 INTRODUCTION
1.1 Aspects of Agricultural Mechanization
1.2 Soil-Tool Interfacial Tribological Phenomena
1.3 Methods for Reducing Tribological Factors
1.4 Objectives of the Study
CHAPTER 2 LITERATURE REVIEW
Glossary of Symbols
2.1 Soil Tillage
2.1.1 Main Factors Describing Performance of Soil-engaging Tools
2.2 Soil-Tool Interaction
2.3 Mechanics of Soil Cutting with Soil-engaging Tool
2.4 Soil-Engaging Components of Crop Establishment Machines
2.4.1 Types and Characteristics of Furrow Openers
2.4.2 Design Criteria of Furrow Opener
2.4.3 Performance of Furrow Openers
2.5 Biomimetic Tribology
2.5.1 Some Special Features of Soil-burrowing Animals
2.5.2 Biomimetics in Anti-adhesion and Anti-friction against Soil
2.5.3 Biomimetic Subsoiling
2.5.4 Biomimetic Walking
2.6 Finite Element Analysis of Soil-Tool Interaction
2.6.1 Finite Element Method Concept
2.6.2 Theoretical Approach for Finite Element Analysis and Virtual Work Theory
2.6.3 Soil Models
2.6.4 Non-Linearity Problem
2.6.5 Models for Soil and Interface
2.6.6 Two-Dimensional Soil Cutting Analysis
2.6.7 Three-Dimensional Soil Cutting Analysis
CHAPTER 3 METHODOLOGY
3.1 Geometrical Morphological Surfaces of Soil-Burrowing Animals
3.1.1 Measurement of Radii of Curvature of Yellow Mouse Claw Sections
3.1.2 Morphological Surface of Dung Beetle
3.2 Biomimetic Designs of Soil-Engaging Components of Planting Machine and Bulldozing Blade
3.2.1 Biomimetic Designs of Furrow Opener Surface
3.2.2 Biomimetic Designs of Covering Devices and bulldozing blades
3.3 Soil Tests
3.4 Structural Analysis in ANSYS
3.4.1 Material Definitions for Mesh Generation
3.4.2 Boundary Conditions
3.4.3 Solution of the Boundary Problem
3.4.4 Post-processing
3.5 Prediction of Furrow Opener Resistant Force and Power
3.6 Preparation of Furrow Opener Model
3.7 Experimental Work
CHAPTER 4 RESULTS AND DISCUSSION
4.1 Effect of Non-Smooth Structures on Stresses Distribution on Furrow Opener
4.2 Effect of Radius of curvature on Stresses Distribution on Covering Device and Bulldozing Blade
4.3 Effect of Non-Smooth Structures on Stresses Distribution on Covering Device and Bulldozing Blade
4.4 Resistance Force and Power Requirement for Conventional Surface Furrow Opener and Opener Surface with UHMWPE Tubular Section Ridges
CHAPTER 5 AGRICUTURAL AND MECHANIZATION STATUS IN SUDAN AND POTENTIAL APPLICATIONS OF BIOMIMETIC TECHQIUES
5.1 Introduction
5.2 Agricultural Potential of Sudan
5.2.1 Climate and soil of Sudan
5.2.2 Water resources in Sudan
5.2.3 Farming systems
5.3 Agricultural Mechanization Level in Sudan
5.3.1 Mechanization of small scale farms
5.3.2 Mechanization of large scale rain–fed farms
5.3.3 Mechanization of farms under irrigated schemes
5.4 Energy in Agriculture in Sudan
5.5 Operators’Training and Management
5.6 Constraints of Agricultrual Mechanization in Sudan
5.6.1 Agricultural investment
5.6.2 Land
5.6.3 Capital
5.6.4 Infrastructure
5.6.5 Energy and maintenance
5.6.6 Training and machinery testing
5.7 Potential Applications of Biomimetic Techniques in Sudan
CHAPTER 6 CONCLUSION AND RECOMMENDATIONS
6.1 Conclusion
6.2 Recommendations
REFERENCES
APPENDIX A
APPENDIX B
APPENDIX C
ACADEMIC ACHIEVEMENTS DURING STUDY
ACKNOWLEDGMENT
ABSTRACT
摘要
发布时间: 2005-08-26
参考文献
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- [2].精密播种机开沟器对种子触土后位移的控制及部件的研究[D]. 袁锐.吉林大学2006
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标签：土壤机具相互作用论文; 开沟器论文; 培土器论文; 推土铲论文; 仿生表面论文; 计算机模拟论文; 土壤阻力论文;