提高汽车碰撞仿真计算效率的网格规模控制方法  

Methods of the Mesh Dimension Constraint for Enhancing the Simulation Efficiency of Vehicle Crash

作　　者：施欲亮[1] 朱平[1] 张宇[1] 沈利冰[1] 林忠钦[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《上海交通大学学报》2008年第6期905-909,共5页Journal of Shanghai Jiaotong University

基　　金：国家高技术研究发展计划(863)资助项目(2006AA04Z126)

摘　　要：从网格规模控制角度,提出了提高仿真计算效率的徐变区域网格划分方法,并详细描述了3种徐变区域的网格划分步骤及其在整车模型不同零件上的应用;建立了以机器性能、单元总数、仿真时间、最小时间步长和接触搜索因子为变量的CPU计算时间控制方程,以合理布置徐变区域,控制模型网格规模,减少模型计算时间;通过正碰仿真试验,验证了徐变区域网格划分和CPU计算时间控制相结合进行整车模型网格规模控制可保证计算精度,同时能够提高计算效率,并证明了该方法的可行性.From the changing areas was point of view of mesh dimension control, a method of meshing a vehicle using gradually put forward, in which three types of gradually changing areas are detailedly described in addition to their application in different parts of an automobile. The CPU time governing equation was established, taking computer performance, element counts, simulation time, minimum time step and contact factor as the variables, in an attempt to rationally distribute the gradually changing areas and control the mesh dimension of the model so that reduce the calculation time. The full-width frontal impact simula- tion of the whole car shows that combining the above two methods to control the mesh dimension of the car model can enhance the simulation efficiency with no sacrifice of simulation accuracy, which proves the va lidity of the methods.

关 键 词：汽车碰撞仿真 网格规模 计算效率 徐变区域 

分 类 号：U461.91[机械工程—车辆工程]