中日零部件贸易发展态势分析

本文用1992-2003年SITC5分位数据对中日零部件贸易发展水平、构成及中国零部件在日本市场上,在生产与组装方面的比较优势进行了实证研究。结果发现,这一时期,中日零部件贸易经历了较大程度的发展,而这一发展在很大程度上是由中国对日本零部件的进口增长带动的。中国在日本市场上最具生产比较优势的产品集中于电气机械及器材制造业和普通机械制造业,而电子通信及设备制造业等行业的生产优势不断下降。中国零部件组装在日本市场上具有较强的比较优势,这说明在对日贸易中,中国劳动力成本的比较优势还有很大的利用空间。     

面向飞机自动化装配的物料配送体系研究

文中分析了飞机装配车间物料配送现状及存在问题,提出了面向飞机自动化装配的物料配送管理体系构建思路、模型和流程,着重阐述了该体系“六大业务板块”具体管理要求,并以工程实例证明了其应用效果。     

双螺杆式制冷空调压缩机关键装配技术的几点探讨

主要介绍了双螺杆式制冷空调压缩机关键装配技术,对螺杆压缩机通用装配工艺进行了总结和归纳,对轴承安装和轴向间隙设置进行了技术探讨。     

基于遗传算法的装配线平衡问题研究

文中针对装配线平衡问题,提出了一种基于可行作业序列的多种群遗传算法。该算法依据可行作业序列产生初始种群,并据此构造交叉、变异算子,以保证后代种群都是可行解;而且多种群的遗传算法,扩大了搜索的空间范围,所以可以有效的避免局部最优的情况发生,而且还能增强算法的运行效率。文章在最后,用实例进行了运行效果的验证。     

建筑装配式产业化电气施工配管问题与研究

建筑产业化在整个建筑施工中占据着非常重要的地位,故此电气配管工作也已经成为了保证建筑施工质量的主要技术手段之一。对此,论文主要对吊装式产业化电气施工配管问题进行研究,以供参考。     

飞机翼身交点孔精加工中的机身位姿评估与优化

为了避免飞机数字化总装过程中翼身交点孔精加工出现安全问题,提出机身位姿评估与重定位优化方法：基于加工前获得的各翼身接头的三坐标测量数据,建立交点孔的精加工余量评价模型.当部分交点孔不满足精加工可执行条件时,对机身进行重定位以实现加工余量的重新分配.给出一种确定机身重定位调姿参数的约束优化方法,确保重定位后的机身满足位姿要求和交点孔的精加工余量要求.仿真结果表明,该方法能及早发现并消除由不适当的机身位姿引起的翼身交点孔精加工问题.     

电动三轮车装配流水线的平衡分析与改进

在生产线平衡原理及改善方法的基础上,以电动三轮车装配流水线为研究对象,运用工作研究的方法分析工艺流程,测定流水线各工位的作业时间,找出瓶颈工位;运用"5W1H"提问技术和ECRS(取消、合并、重排、简化)原则对流水线进行分析与改进。通过对比分析,改进后该流水线大大节省了空间和人力,工位减少6个,工人减少11个,与此同时,平衡率提高27.6%。     

大伙房输水工程特长隧洞设计要点

介绍了大伙房水库输水工程特长隧洞设计要点。根据工程地质、地形条件,选择隧洞的施工方法和TBM型式,并对TBM地下组装洞室、隧洞施工通风、连续皮带机出渣、不良地质段施工对策等关键技术问题进行了论述。     

Optimally locating in-house logistics areas to facilitate JIT-supply of mixed-model assembly lines

In modern-day production systems, ever-rising product variety poses a great challenge for the internal logistics systems used to feed mixed-model assembly lines with the required parts. As an answer to this challenge many manufacturers especially from automobile industries have identified the supermarket-concept as a promising part feeding strategy to enable flexible small-lot deliveries at low cost. In this context, supermarkets are decentralized in-house logistics areas in the direct vicinity of the final assembly line, which serve as intermediary stores for parts. Small tow trains are loaded with material in a supermarket and deliver parts Just-in-Time to the stations lying on their fixed route. This paper discusses the general pros and cons of the supermarket-concept and treats the decision problem of determining the optimal number and placement of supermarkets on the shop floor. A mathematical model is proposed, an exact dynamic programming algorithm presented, and the validity of the proposed approach for practical purposes as well as the trade-off resulting from fixed installation and maintenance cost is investigated in a comprehensive computational study.     

Ant colony optimization for the single model U-type assembly line balancing problem

An assembly line is a production line in which units move continuously through a sequence of stations. The assembly line balancing problem is defined as the allocation of tasks to an ordered sequence of stations subject to precedence constraints with the objective of optimizing a performance measure. In this paper, we propose ant colony algorithms to solve the single-model U-type assembly line balancing problem. We conduct an extensive experimental study in which the performance of the proposed algorithm is compared against best known algorithms reported in the literature. The results indicate that the proposed algorithms display very competitive performance against them.