沈阳农业大学学报2017，Vol.48Issue(1)：55-62,8.DOI:10.3969/j.issn.1000-1700.2017.01.008
水田作业机械仿生表面减阻机理的离散元研究
A DEM Analysis on Drag Reduction Characteristics of Paddy Field Machinery Surface with Bionic Microarchitectures
摘要
Abstract
Research on drag reduction of farm machinery in paddy field has important energy conservation significance, but due to the discrete characteristics and mechanical characteristics of saturated soil layer in paddy soil are different from dry soil, the majority of simulation method cannot be directly applied to the study in paddy fields. In order to study drag reduction characteristics of paddy field machinery surface with bionic microarchitectures and find an analysis method suitable for the research in paddy field saturated soil - machine interaction, we established the discrete element model of paddy soil with EDEM and the interaction between the surface of machine parts and saturated soil layer, designed the surface of machine parts contacting with soil leaning the scales microarchitectures of Ctenopharyngodon idellus, and presented a simulation of the interaction between the surface of machine parts and the saturated soil layer. The tangential force of the two surfaces, soil particles migration and the distribution of the particles were obtained. We analyzed the drag reduction mechanism of the machine parts with bionic microstructures that contacted with soil through the theory of tribology and fluid lubrication. The simulation results showed that in the speed of 0.8m·s-1 (the average speed of high-speed transplanter), the average shear stress in the bionic plane was 1.59E-05N, the average shear stress in the smooth plane was 3.71E-05N, the bionic sample could reduce the total resistance by up to 49.84% under the condition of paddy field. The results showed that the bionic sample piece had a better drag reduction effect than the smooth sample piece, which could improve the lubrication conditions, form fluid lubrication effect, reduce the contact area and change the coefficient of friction and the way of the mud migration. This paper provided a reference for the research on mechanism of drag reduction of farm machinery riding on paddy field and the research on the interaction between the surface of machine parts and saturated soil layer.关键词
水田机械/仿生减阻/EDEM/JKRKey words
farm machinery in paddy field/bionic drag reduction/JKR/EDEM分类
农业科技引用本文复制引用
邬立岩,齐胜,宋玉秋,辛明金,刘翠红,孔爱菊,焦志彬,刘峰,任文涛..水田作业机械仿生表面减阻机理的离散元研究[J].沈阳农业大学学报,2017,48(1):55-62,8.基金项目
国家自然科学基金项目(51305282,51275319) （51305282,51275319）
辽宁省高等学校杰出青年学者成长计划项目(LJQ2014071) （LJQ2014071）
公益性行业(农业)科研专项经费项目(201503116) （农业）
