矿用清障车托举机构疲劳寿命分析及结构优化  

Fatigue Life Analysis and Optimization of the Lift Mechanism of Mining Wrecker

作　　者：谷正气[1,2] 臧晓蕾[1] 伍文广[1] 米承继[1] 王玉涛[1] 蒋金星[1] 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082 [2]湖南工业大学,湖南株洲412007

出　　处：《湖南大学学报（自然科学版）》2014年第2期58-63,共6页Journal of Hunan University:Natural Sciences

基　　金：国家高技术研究发展计划(863计划)项目(2012AA041805);交通运输部新世纪十百千人才培养项目(20120222);湖南省科技重大专项计划项目(2009GK1002)

摘　　要：研究矿用清障车托举机构的疲劳寿命,并针对传统经验设计下的结构进行优化设计.采用多体动力学和有限元联合仿真的方法,建立整车刚柔耦合动力学模型,将仿真获得的载荷时间历程作为托举机构疲劳分析的随机载荷谱,利用S-N方法对托举机构进行疲劳寿命预测.结果显示,机构最小疲劳寿命为4.54×106次(相当于4.3年),对于需要长期运作的矿用车来说该值偏小.进而采用基于变密度法的拓扑优化方法以静态多工况刚度和动态低阶固有频率为目标对托举机构进行优化设计,获得了最优的臂架拓扑图,再对托举机构进行尺寸优化,依据优化结果完成新托举机构的设计.最后与原托举机构的强度和疲劳寿命进行比较,结果表明,优化后的托举机构强度和疲劳寿命分别改善了11.7%和521%.In order to study the fatigue life of the lift mechanism of mining wrecker and optimize the de-sign of the weak part, a model of a rigid-flexible coupling system was established by integrating multi-body dynamic simulation and finite element method. Regarding dynamic analysis results as the random load of fatigue life analysis of lift mechanism, fatigue life contours were obtained and the minimum life was low. Based on SIMP method, topology optimization of lift mechanism was studied, and the multi-stiffness of static and eigenfrequencies were regarded as the optimization objectives. Then, the size optimization of the lift mechanism was studied. Compared with the stiffness and fatigue life of original lift institution, the per-formances of optimized structure are improved by 11.7% and 521 %, which provides reference and basis for the design of the mining wrecker lift institution.

关 键 词：矿用清障车 托举机构 刚柔耦合 疲劳寿命 拓扑 优化 

分 类 号：TH221[机械工程—机械制造及自动化]