滚磨光整加工的离散元模拟速度优化分析  

The Speed Optimization Analysis of DEM Simulation in Barrel Finishing Process

作　　者：张荔[1] 李文辉[1] 杨胜强[1] 李秀红[1] 

机构地区：[1]太原理工大学机械工程学院,山西太原030024

出　　处：《机械设计与制造》2016年第2期153-156,160,共5页Machinery Design & Manufacture

基　　金：国家自然科学基金主任基金(51345010)

摘　　要：滚磨光整加工作为提高和改善零件表面质量的重要途径之一,以其高效,低成本的特点在机械加工领域占据重要地位。在使用离散元法进行滚磨光整加工过程的模拟计算时,由于现有计算机运算能力的限制,常常因为模拟所需时间过长,导致无法高效、完整的完成整个模拟。有许多方法能够减少离散元模拟的计算量,缩短模拟时间,其中一种方法是通过适当增加离散元计算时迭代的时间步长来减少迭代次数,从而缩短模拟时间,但这种方法存在一定的条件限制,且可能会造成对磨块行为的描述不准确,甚至造成模拟结果的发散。基于对BJL-LL05型离心式滚磨光整加工过程的模拟,提出一种得到滚磨光整加工所能够适应最大时间步长的方法,以期达到显著减少模拟计算时间,缩短计算成本的目的。模拟速度最终可达到最高10倍的计算加速比,并进一步验证了调整滚磨光整加工时间步长的正确性。Barrel finishing,as a very promising way to enhance and improve the surface quality of parts,plays an important role in machining fields with its efficient,cost-effective characteristics in the machining field. Applying the discrete element method（DEM）to barrel finishing process due to the limitations of computing power consumes too much time to complete the simulation. A number of techniques exist for minimizing the computational cost of discrete element simulation. One such method is an increment of time steps,which allows for less iteration in simulation. However,this method has some certain conditions,and may result inaccurate description of granular behavior,even cause diverge of the simulation. Based on the simulation of vertical centrifugal barrel finishing process,a method has been proposed to get the maximum time step that can be used in barrel finishing simulation,in order to have a significant reduction in computation time and shorten the calculation of costs. It can finally reach up to 10 times the computation speedup,and verify the validity of adjusting the time step in Barrel Finishing Process.

关 键 词：离散元法 缩短模拟时间 滚磨光整加工 最大时间步长 磨块行为 

分 类 号：TH16[机械工程—机械制造及自动化]