木托盘有限元分析精度的影响因素

Factors Affecting the Precision of Finite Element Analysis of Wooden Pallet

目的研究有限元软件模拟木托盘抗弯性能时各因素对其分析精度的影响。方法对木托盘的抗弯性能进行理论分析和有限元模拟。通过计算铺板力学模型得到理论变形值;将Creo软件建立的托盘模型导入Ansys Workbench进行分析,得到有限元模拟值。采用控制变量法,改变单元类型和网格划分方式,并将结果与理论计算值进行对比分析。结果采用软件默认的单元类型和经网格划分方式等得到的整体位移结果与理论值的误差为2.97%。通过对各影响因素的调整,顶铺板的位移结果与理论值的误差为0.02%。结论单元数量相同的情况下,高阶单元的分析精度优于低阶单元,六面体单元优于四面体单元。保持其他设置条件不变,细化网格可提高分析精度。

The work aims to study the effects of all factors on the analysis precision when the finite element software was used to simulate the bending performance of wooden pallets. The theoretical analysis and finite element simulation of the bending performance of wooden pallets were made. The theoretical deformation values were obtained through the calculation of deck mechanical model. The pallet model created by Creo software was imported into Ansys Workbench for analysis, and the finite element simulation values were obtained. The control variable method was used to change the element type and meshing method, and the results and theoretical calculations were compared and analyzed. The ror between overall displacement results and theoretical value obtained by the default software element type and meshing method was 2.97%. Through the adjustment of each influence factor, the error between the displacement result and the theoretical value of top deck was 0.02%. In the case of the same number of elements, the analysis precision of the higher-order element is better than the lower one. Hexahedral element is superior to the tetrahedral element. With the other setting conditions unchanged, the refined mesh can improve the analysis precision.