离散元仿真中挖掘机铲斗结构表面的单元球表示方法探究
方自强
(江汉大学 机电与建筑工程学院,湖北 武汉 430056)
摘要:提出了一种基于单元球的铲斗结构表面的多精度几何表示方法。该方法针对铲斗的斗底板、侧腹板、侧刀板、前刀板和斗齿5个部位的几何特征和功能要求,实施基于单元球的多精度几何表示。对比分析不同精度下单元球表达的铲斗结构表面,发现离散元仿真时间会随铲斗结构表面的几何表示精度的提高而增加。因而,铲斗结构表面的单元球表示需综合考虑仿真精准性与仿真时间的需求。对比分析不同精度下单元球与三角面片表示方法,证实了单元球表示方法具备有效表示铲斗结构表面的局部几何细节的能力。相比于三角面片表示方法,单元球表示方法有望在铲斗挖掘过程离散元仿真中花费更少的计算时间。
关键词:挖掘机铲斗;结构表面;几何表示;离散元仿真;单元球
中图分类号:U294.8+8 文献标志码:A doi:10.3969/j.issn.1006-0316.2020.04.003
文章编号:1006-0316 (2020) 04-0013-07
An Investigation on the Geometric Modeling for Structure Surface of Digging Bucket Using Elemental Spheres in the DEM Simulation
FANG Ziqiang
( School of Electromechanical and Architectural Engineering, Jianghan University, Wuhan 430056, China )
Abstract:A multi-precision geometric modeling is proposed for the structure surface of digging bucket using elemental spheres. Based on the geometrical features and functionality requirements, this multi-precision geometric modeling is applied in analyzing the structure surfaces of the bottom plate, web, lateral plates, front plates and teeth in a digging bucket. Comparing the geometric models of the digging bucket with different precision, the result shows that the time consumed in the DEM simulation increases with the rise of the precision of geometric modeling for structure surface. Therefore, both the efficiency and veracity of DEM simulation should be taken into account in the geometric modeling. The comparison between our method and triangular facet method shows that the elemental spheres are able to express the local geometry characteristic of the digging bucket. It can be expected that our method takes less computational time than triangular facet method in the DEM simulation of digging process.
Key words:digging bucket;structure surface;geometric modeling;DEM simulation;elemental spheres
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收稿日期:2019-12-16
基金项目:湖北省自然科学基金(2019CFB208);江汉大学高层次人才科研启动经费(1006-06640001)
作者简介:方自强(1987-),男,湖北武汉人,博士,讲师,主要研究方向为颗粒系统离散元仿真技术研究与应用,fangziqiang1202@sina.com。
 

 

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