复合形态深松铲耕作阻力有限元分析与试验

以复合形态深松铲为研究对象,采用ANSYS/LS-DYNA分析了深松铲在土壤耕作过程中耕深与前进速度对深松耕作阻力的影响,并以圆弧形深松铲为比较对象,分析了复合形态深松铲的减阻效果。为了验证有限元分析方法的可行性,对复合形态深松铲和圆弧形深松铲进行了室内土槽的耕作阻力验证试验。研究结果表明,通过有限元法模拟出的深松铲耕作阻力与室内土槽试验所测定的结果具有相同的变化趋势,利用有限元法可以分析深松铲的工作性能。在深松铲前进速度为4～5 km/h范围内,相对于圆弧形深松铲,用有限元法模拟复合形态深松铲的耕作阻力在耕深为300、350和400 mm时,平均减阻分别为44.07%、43.71%和33.83%。

Finite Element Analysis and Experiment of Soil Resistance of Multiplex-modality Subsoiler

The general explicit nonlinear finite element program ANSYS/LS-DYNA was used as a tool to research the influence of tillage depth and operating speed on operating resistance of the multiplex-modality subsoiler,as well as to study the significance of operating resistance reduction of the multiplex-modality subsoiler compared with the standard arc-shape subsoiler.In order to prove the reliability of the finite element analysis method,the operating resistance of the multiplex-modality subsoiler and the standard arc-shape subsoiler was tested in a soil bin.The result showed that there was a same varying trend between the operating resistance data obtained by the finite element method and soil bin test,and the finite element method was suitable to the research of the performance of subsoiling.With the fixing operating speed of 4～5km/h,average operating resistance of the multiplex-modality subsoiler reduced by 44.07%,43.71% and 33.83% than of the standard arc-shape subsoiler,based on tillage depth of 300 mm,350 mm and 400 mm,respectively.All these data proved that the multiplex-modality subsoiler had a significant effect on operating resistance reduction.