FUNDAMENTAL STUDY ON A PARALLEL NUMERICAL ANALYSIS FOR PERFORMANCE PREDICTION OF AGRICULTURAL TIRE BY 3D FE-DE METHOD

3D FE-DE 方法预测农用轮胎性能的并行数值分析基础研究

• 批准号: 12660231
• 负责人: NAKASHIMA Hiroshi
• 金额: $ 2.24万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12660231/
• 关键词: Terramechanics; Computational Mechanics; FEM; DEM; Contact Problem; Tire; Mesh Preparation; FE-DE Method; 有限要素法; 離散要素法; 並列処理; 農用タイヤ

Firstly, the preparation of FE mesh for tire was done. We developed two 3D FE mesh generation programs; one for smoothed tires, and the other for traction tires. Generation of FE mesh for traction tire could successfully demonstrated by using a typical tire data.The capability of DEM to include the effect of wheel lug was also verified by the recent development of 2D DEM program in our Agricultural Systems Engineering Laboratory. The problem of large computational time is expected when 3D DEM program is developed.The possibility of dynamic FE-DE method was investigated in terms of the application in soil-tire system. We assumed that a tire and deep soil layer could be modeled as FEM and soil surface layer as DEM. We developed a combined FE-DEM code to analyze an agricultural tire-soil interaction problem. Simple contact algorithm is adopted in terms of computational speed. Small example problem of vertical tire sinkage on to a deformable soil was analyzed and we found that the sufficient accuracy of analysis for displacement field could be obtained.As for tire rolling problem, it was found that the FE-DEM code could include the function of tire rotation and translation. The result of the basic analysis showed that the deformation could be analyzed qualitatively, but the total vertical reaction exhibited the heavy vibratory result. Further detailed study should be added to this problem.As the one of possible and useful tool, we investigated the possible application of message passing parallel processing for FE-DEM. The following points are clarified.In the developed FE-DEM program, contact check and contact reaction subroutines in DEM are the two most time-consuming parts.If the parallel processing system is introduced, FEM and DEM in FE-DEM program should be allocated to two nodes and there may be possible to devide the contact check loop in DEM into more than two parallel processes.

首先，进行了轮胎有限元网格的制备。我们开发了两个3D有限元网格生成程序；一个用于平滑轮胎，另一个用于牵引轮胎。通过一个典型的轮胎数据，成功地生成了牵引轮胎的有限元网格，并通过我们农业系统工程实验室最近开发的二维DEM程序验证了DEM考虑轮片影响的能力。针对三维DEM程序开发过程中计算量大的问题，从土壤-轮胎系统的应用出发，探讨了动态有限元-动态法的可行性。我们假设轮胎和深层土层可以用有限元模拟，土壤表层可以用DEM模拟。我们开发了一个组合的FE-DEM程序来分析一个农业轮胎-土壤相互作用问题。在计算速度上采用了简单接触算法。分析了轮胎垂直下沉在变形土上的小算例，发现可以获得足够高的位移场分析精度；对于轮胎滚动问题，FE-DEM程序可以包含轮胎旋转和平移功能。基本分析结果表明，可以对结构的变形进行定性分析，但总的竖向反应表现出较大的振动结果。作为可能和有用的工具之一，我们研究了消息传递并行处理在有限元分析中的可能应用。在开发的FE-DEM程序中，接触校验子程序和接触反作用子程序是最耗时的两个部分，如果引入并行处理系统，FE-DEM程序中的有限元和DEM需要分配到两个节点上，这样就有可能将DEM中的接触检查循环划分为两个以上的并行过程。

项目成果

H.Nakashima, et al.: "Simulation of soil-tire interaction by a coupled Distinct Element-Finite Element Method"Proc. 6th Asia-Pacific ISTVS Conf., Bangkok, Thailand. 59-63 (2001)

H.Nakashima 等人：“通过耦合离散元-有限元法模拟土壤-轮胎相互作用”Proc。

M.Momozu, et al.: "Simulation of shear box test by the Distinct Element Method"Proc. 6th Asia-Pacific ISTVS Conf., Bangkok, Thailand. 181-188 (2001)

M.Momozu 等人：“通过不同元素方法模拟剪切盒测试”Proc。

H. Nakashima and A. Oida: "Algorithm and implementation of soil-tire contact analysis code based on dynamic FE-DE method"Proceedings of the 14th International Conference of ISTVS, Vicksburg. CD-ROM. (2002)

H. Nakashima 和 A. Oida：“基于动态 FE-DE 方法的土壤-轮胎接触分析代码的算法和实现”第 14 届 ISTVS 国际会议论文集，维克斯堡。

H. Nakashima, A. Oida: "Simulation of soil-tire interaction by a coupled Distinct Element-Finite Element Method"Proceedings of the 6th Asia-Pacific ISTVS Conference, Bangkok. 59-63 (2001)

H. Nakashima、A. Oida：“通过耦合离散元-有限元法模拟土壤-轮胎相互作用”，曼谷第六届亚太 ISTVS 会议论文集。

M. Momozu, A. Oida, H. Nakashima: "Simulation of shear box test by the Distinct Element Method"Proceedings of the 6th Asia-Pacific ISTVS Conference, Bangkok. 181-188 (2001)

M. Momozu、A. Oida、H. Nakashima：“通过不同元法模拟剪切盒测试”第六届亚太 ISTVS 会议论文集，曼谷。