基于光滑粒子流体动力学仿真的板结土壤深旋耕技术  

Deep-tillage Rotavator Technology Based on Smoothed Particle Hydrodynamics Simulation

作　　者：钟江[1] 蒋建东[1] 姜涛[1] 赵章风[1] 乔欣[1] 张宪[1] 

机构地区：[1]浙江工业大学机械工程学院,杭州310014

出　　处：《机械工程学报》2010年第19期63-69,共7页Journal of Mechanical Engineering

基　　金：'十一五'国家科技支撑计划(2006BAD11A10-02);国家自然科学基金(50805131);浙江省科技厅重大科技(2007C12089;2008C02006-3)资助项目

摘　　要：针对中国南方丘陵、尤其是茶园板结土壤的特点,提出采用正反旋耕相结合进行土壤切削的方法,并设计反旋凿切和正旋旋耕相结合的板结土壤深松作业机具。为实现小功率的板结土壤深松作业,利用光滑粒子流体动力学有限元法研究反旋凿切土壤的物理过程,构建土壤高速凿切的有限元数值仿真模型;同时结合正交试验设计和数值模拟技术,进行反旋凿切刀具的刀尖结构参数和土壤反旋凿切工作参数的有限元数值分析与优化。研究表明,利用反旋凿切进行板结土壤的切削,在选择合适的结构切土角、结构后隙角、机组前进速度和凿切刀旋转速度的合理匹配后,能有效降低板结土壤耕作机组的消耗功率、提高其工作效率,从而达到采用小型农业动力机具进行板结土壤深松作业的目的。In view of the characteristic of china southern hilly soils,especially compacted soil of tea garden,a deep tillage method and a jointed mechanism made up of an up-cut tillage tool and a down-cut tillage tool,is proposed and designed for harden soil deep-tilling with low-power motor.In order to reduce the power of small agricultural machinery dealing with deeply-loosening tillage in hardened soil,a soil reverse-rotary tilling process simulation and a finite element analysis model of soil high-speed cutting are studied by using smoothed particle hydrodynamics finite element method.Accordingly,structural parameters of reverse-rotary tillage tool and the working parameters of reverse-rotary tillage mechanism are studied and optimized by using orthogonal experimental method and FEA numerical simulation technology.The results show that it is perfectly feasible to apply the proposed composite tillage method and jointed mechanism on harden soil deep-tilling with low power motor,and for a soil deep-tilling process,proper structural parameters of tillage tool and working speed can reduce the power consumption of the reverse-rotary tillage mechanism.

关 键 词：土壤力学 反旋 三维数值模拟 旋耕机 

分 类 号：S222.3[农业科学—农业机械化工程]