搅拌摩擦焊接技术在汽车制造中的应用研究

搅拌摩擦焊接是固相连接技术，焊接过程中形成精细的锻造组织，具有较高的接头性能。在介绍搅拌摩擦焊技术的基础上，对该技术在汽车制造业中的应用进行了探讨。对搅拌摩擦点焊技术进行了介绍。由于搅拌摩擦点焊具有成本低、耗能少等优势，可完全替代传统点焊方法用于汽车制造。     

轨道视频检查系统

介绍了轨道视频检查系统研究中的一些相关技术，并对ENSCO公司的VSI系统作了简单介绍，为我们研制自己的轨道视频检查系统提供帮助。     

Tool sequence optimization based on three logical modes of robot control via CPLEX optimization

Cluster tools have advantages of shorter cycle times, faster process development, and better yield for less contamination. The sequence of dual-arm cluster tools is a complex logistics process during the semiconductor production. Efficient use of cluster tools is naturally very significant to competitive fab operations. Generating an optimized sequence in a computationally efficient manner and assessing the quality of the requirements to improve the fab production are the key factors for semiconductor manufacturing productivity. The Petri net modeling is introduced to minimize the makespan of the process for the three different logical modes and select a better mode after comparing the makespan among the three logical modes. The tool sequence optimization problem is formulated as optimization firing transition sequences based on the Petri net and then the formulation is converted to be linearly solved by the branch-and-cut method in the standard commercial solver CPLEX. Special methods for the linear conversion are highlighted. Due to the limited calculation time requirement for the real production and the large scale of the problem, special methods for the efficiency tuning are applied according to the characteristics of the problem. Numerical testing is supported by one of the most advanced semiconductor enterprises and the computational results show significant improvement compared with the traditional manual sequence results.     

防止油轮污染 保护海洋环境

绿色和平组织报告指出：过去30年，共有超过1万件海上油轮事故发生，约600万吨浮油于海上漂流；近50年来，全世界因油类污染己使1000多种海洋生物灭绝。文章以最新国际统计资料来说明目前油轮污染的严重性，并阐述航运发达国家防油轮污染政策，并在此基础上提出相关预防对策及措施。     

基于Google Map的物流监控系统设计

文中就国内物流企业对监控系统的要求做了分析，设计了一款基于Google Map的物流监控系统，包括对车载单元与监控中心的设计。其中，监控中心软件基于Google Map API进行二次开发，采用先进的最优路径算法对所设计的监控系统进行实验，结果表明所设计的系统能够实现车辆状态的实时监控和最优路径的计算与规划。     

高压水平旋喷桩在隧道塌方治理中的应用

在隧道塌方治理中,由于围岩地质的特殊性,无法采用常规支护治理措施确保施工安全,因此水平旋喷高压劈裂技术的应用,可确保安全快速的通过塌方段。结合包西铁路新九燕山隧道一大型塌方段的综合治理,阐述了在饱水黏土层塌方体中的种综合治理措施、水平旋喷高压劈裂注浆的加固机理和施工作用,可为类似的工程加固施工提供借鉴和参考。     

光缆在线监测系统

在兰新线乌鲁木齐-疏勒河段和乌鲁木齐地区环网上开通的光缆在线监测系统,对于光缆线路障碍的快速判断、定位和处理,发挥了极大的作用.     

DGM-NG型船用管路通舱耐火密封装置的研制和应用

介绍了一种新型舰船用管路通舱装置的研制、试验过程、特点及其应用情况,对该装置进行了多达21项试验,表明其耐火性能和密封性能指标均达到国际先进水平,具有良好的应用价值。     

灰色聚类法在泥石流类型判别中的应用

介绍灰色聚类法在泥石流流体分类中的应用,并以一些地区的泥石流沟为例,利用灰色聚类法对泥石流类型进行了判别。结果表明:用灰色聚类法对泥石流进行分类,使其分类数学化和定量化,对于解决常规多因子分类,由于指标交叉而不能归类的问题更显其优越性。     

Dynamic analysis of a pantograph-catenary system using absolute nodal coordinates

The dynamic interaction between the catenary and the pantographs of high-speed trains is a very important factor that affects the stable electric power supply. In order to design a reliable current collection system, a multibody simulation model can provide an efficient and economical method to analyze the dynamic behavior of the catenary and pantograph. In this article, a dynamic analysis method for a pantograph-catenary system for a high-speed train is presented, employing absolute nodal coordinates and rigid body reference coordinates. The highly flexible catenary is modeled using a nonlinear continuous beam element, which is based on an absolute nodal coordinate formulation. The pantograph is modeled as a rigid multibody system. The analysis results are compared with experimental data obtained from a running high-speed train. In addition, using a derived system equation of motion, the calculation method for the dynamic stress in the catenary conductor is presented. This study may have significance in providing an example that a structural and multibody dynamics model can be unified into one numerical system.