China Mechanical Engineering

Previous Articles     Next Articles

Multi-working Condition Topology Optimization of Forklift Door Frames Based on Working Condition Risk Assessments

ZOU Kun;HOU Liang;BU Xiangjian;FANG Yikai   

  1. School of Aerospace Engineering,Xiamen University,Xiamen,Fujian,361005
  • Online:2019-03-10 Published:2019-03-07

基于工况风险评估的叉车门架多工况拓扑优化

邹坤;侯亮;卜祥建;方奕凯   

  1. 厦门大学航空航天学院,厦门,361005
  • 基金资助:
    福建省科技重大专项(2016HZ0001-9)

Abstract: The standard door frame of a 3T internal-combustion forklift was taken as an example, the global nonlinear finite element analyses of the door frame systems were realized under the typical conditions. Based on working condition data (work durations, structure stresses and deformation displacements), the working condition risk assessment method and the concept of working condition RI were put forward. According to the working condition RI, an objective weighting coefficient distribution method was proposed for multi-working condition topology optimization. Using the compromise programming approach, taking the door frames weighted flexibility minimum as the goal function under the multi-working conditions, the topology optimization of door frames was realized. According to the optimization results, the structures of the door frames were redesigned, and the finite element analyses were carried out. The results show that compared with the traditional average distribution method, the risk assessment method may get better target values. Compared with the original structures of door frames, the maximum stresses of the new door frames under three typical conditions are reduced by 10.05%, 10.25% and 1.58% respectively, the maximum displacements are reduced by 13.17%, 12.93% and 8.28% respectively, and the mass is reduced by 7 kg.

Key words: forklift door frame, working condition risk index(RI), weighting coefficient, compromise programming approach, multi-working condition topology optimization

摘要: 以某3T型内燃叉车的标准门架为例,实现了典型工况下门架系统的整体非线性有限元分析;基于工况数据(工作时长、结构应力及形变位移),提出了工况风险评估方法及工况风险指标(RI)的概念;依据工况风险指标,提出了一种分配多工况拓扑优化权重系数的方法;采用折中规划法,以多工况下门架加权柔度最小为目标函数对门架结构进行拓扑优化;根据优化结果对门架结构进行改进设计,并进行了有限元分析。研究结果表明:风险评估法较传统平均分配法能得到更优的目标值;与原门架结构相比,新门架结构在3种典型工况下的最大应力分别减小10.05%、10.25%和1.58%,最大位移分别减小13.17%、12.93%和8.28%,质量减小7 kg。

关键词: 叉车门架, 工况风险指标, 权重系数, 折中规划法, 多工况拓扑优化

CLC Number: