变密度法在挖掘机动臂轻量化设计中的分析与应用  

Analysis and Application on Variable Density Method in the Process of the Excavator Boom Lightweight Design

作　　者：邓志勇[1,2,3,4] 熊昌炯[1,2,3,4] 洪昊[1,2,3,4] 吴龙[1,2,3,4,5] 

机构地区：[1]三明学院机电工程学院,福建三明365004 [2]机械现代设计制造技术福建省高校工程研究中心,福建三明365004 [3]绿色铸锻及其高端零部件制造福建省协同创新中心,福建三明365004 [4]福建省铸锻零部件工程技术研究中心,福建三明365004 [5]福建三明高新技术产业开发区博士后工作站,福建三明365500

出　　处：《三明学院学报》2016年第2期66-73,共8页Journal of Sanming University

基　　金：三明学院科研基金项目(CB201003/Q);中国博士后科学基金资助项目(2013M541851);福建省科技厅高校产学合作重大项目(2012H6018);福建省自然科学基金资助项目(2012J01232);福建省高校新世纪优秀人才支持计划资助项目(JA13290)

摘　　要：基于多体动力学的基本原理,建立了挖掘机工作装置的刚柔耦合模型。动臂拓扑优化设计采用变密度法,以动臂重量最小化为目标函数,以动臂各单元的相对密度为设计变量,强度和刚度为约束条件。根据计算后得到的相对密度云图对动臂进行轻量化设计,优化后的动臂减重最高可达30.8%。对比分析了拓扑优化设计前后动臂在规定时间内动态应力应变曲线变化趋势,应力应变曲线显示优化后动臂的应力和位移均有小幅增大,但均在许用值范围内,结果表明该优化方法是可行的。Based on the principle of multi-body dynamics, the rigid-flexible coupling model of excavator working device is established. Topology optimization design on boom is performed by the method of variable density design, with the boom weight minimization as the objective function, strength and stiffness as the constraint conditions.Lightweight design is implemented in the boom based on the relative density contours calculated, so the weight reduction of the boom optimized can be up to 30.8%. Within the specified time, the trends on dynamic stress-strain curve between the optimized boom and the original boom are compared and analyzed, the stress-strain curve indicates that stresses and displacements of the optimized boom are slightly increased, but they are within the allowable range of values, the results show that the optimization method is feasible.

关 键 词：变密度法 多体动力学 刚柔耦合 轻量化设计 

分 类 号：TU621[建筑科学—建筑技术科学]