基于SPH法的土壤切削刀具三维数值模拟及优化*

作者：姜涛1，张宪1，乔欣1，章劲2，蒋建东1 日期：2009-06-24/span> 浏览：3940 查看PDF文档

基于SPH法的土壤切削刀具三维数值模拟及优化*

姜涛1，张宪1，乔欣1，章劲2，蒋建东1
(1.浙江工业大学 机械制造及自动化教育部重点实验室，浙江 杭州 310014； 2.盐城市农机技术推广中心，江苏 盐城 224002)

摘要：为优化刀具结构，减小土壤切削的功耗，采用大型动力学软件LSDYNA中的光滑粒子流体动力学（SPH）求解器，结合MAT147材料模型就松土刀具对土壤的切割过程进行了三维动态仿真。建立了反旋凿切的数值模拟模型；并结合正交试验法对松土铲耕作条件进行了仿真。仿真结果表明：利用SPH方法对土壤材料进行大应变、高应变率的变形计算是有效的；定性地得到了耕宽与耕深的关系，且结合相关理论将可以更全面合理地对松土铲刀具结构进行优化。
关键词：光滑粒子流体动力学算法；核函数；光滑长度；松土铲
中图分类号：S817.8文献标识码：A文章编号：1001-4551(2009)06-0044-03

3D numerical simulation and optimization of soil cutting tool based on SPH
JIANG Tao1, ZHANG Xian1, QIAO Xin1, ZHANG Jing2, JIANG Jiandong1
(1. The MOE Key Laboratory of Mechanical manufacture and Automation, Zhejiang University of Technology,
 Hangzhou 310014, China; 2. Yancheng Agrimachinery Research Institute, Yancheng 224002, China)
Abstract: In order to optimize breakshovel structure and decrease the power dissipation of soil cutting, a three dimensional dynamic simulation of soil cutting based on smoothed particle hydrodynamics(SPH) solution of largescale dynamics software LSDYNA and MAT 147 material model was presented. In the research, upcuttings numerical model was established.The farming conditions of breakshovel were simulated, using the orthogonal experiment.The results show that the SPH algorithm for the calculation about soil material large strain and high strain rate of deformation large strain is effective and the relationship of farming width and depth can be received. Combined with the comprehensive theory, a more reasonable optimization of breakshovel structure can be made.
Key words: smoothed particle hydrodynamics(SPH) algorithm; nuclear function; smooth length; breakshovel
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