Nature inspired algorithms to optimize robot workcell layouts

Multi-objective layout optimization methods for the conceptual design of robot cellular manufacturing systems are proposed in this paper. Robot cellular manufacturing systems utilize one or more flexible robots which can carry out a large number of operations, and can conduct flexible assemble processes. The layout design stage of such manufacturing systems is especially important since fundamental performances of the manufacturing system under consideration are determined at this stage. Layout area, operation time and manipulability of robot are the three important criteria when it comes to designing manufacturing system. The use of nature inspired algorithms are not extensively explored to optimize robot workcell layouts. The contribution in this paper is the use of five nature-inspired algorithms, viz. genetic algorithm (GA), differential evolution (DE), artificial bee colony (ABC), charge search system (CSS) and particle swarm optimization (PSO) algorithms and to optimize the three design criteria simultaneously. Non-dominated sorting genetic algorithm-II is used to handle multiple objectives and to obtain pareto solutions for the problems considered. The performance of sequence pair and B*-Tree layout representation schemes are also evaluated. It is found that sequence pair scheme performs better than B*-Tree representation and it is used in the algorithms. Numerical examples are provided to illustrate the effectiveness and usefulness of the proposed methods. It is observed that PSO performs better over the other algorithms in terms of solution quality.     

基于连通管原理的桥梁挠度自动测量方法

基于连通管原理,采用RS485通讯技术等手段,给出了一种桥梁挠度自动测量的方法。该方法具有实时、在线、远程、精确等特点,且不受人为因素和环境因素的影响。通过重庆石板坡长江大桥应用该方法测量挠度的案例证明,其测量结果的相对误差小于5％,表明该系统稳定可靠。这种测量方法能用于更多桥梁挠度的自动监测。     

Aesthetics and complexity in digital layout systems

Abstract

The layout of pages which carry information is the bread and butter of the graphic design profession. The rationale of what elements are chosen and where they are placed is based on tacit knowledge gained over a number of years of experience. The aesthetics associated with the overall finished design are often based on a style. Important elements of style are complexity and aesthetic value. In this paper I explore how various mathematical aesthetic functions can use complexity as an arousal enhancing or limiting mechanism in the application of layout designs.     

改进的蚂蚁算法在矩形优化排料中的应用

矩形件优化排料问题是一类具有NP完全难度的组合优化问题.将改进的蚂蚁算法应用到矩形件优化排料问题求解中,优化试验结果表明可获得比基本蚂蚁算法更好的效果,为矩形件优化排料这类NP完全问题提供了新的思路和方法.     

埋地钢管结构设计思路的探讨

主要通过对国内和美国手册关于埋地钢管不同的设计思路进行分析对照,尤其在不同工况、不同土弧包角及砂浆衬砌作用下对钢管壁厚设计的影响进行了探讨,可为其它工程设计提供借鉴。     

视频监控技术在水利信息平台中的应用

主要介绍视频监控系统技术发展的历程。视频监控系统从最初的模拟监控系统到数字化监控系统,视频监控系统和通信技术借助网络功能使其应用更加方便。水利系统内视频监控技术的大量应用给防汛决策提供了直观的图像信息,提高了工作效率,推动了监控平台的功能整合信息共享的需求;亟待完善水利系统建设监控平台应有的标准规范。     

供水管网中压力真实值的批次平差算法

分析了测压点优化布置的意义及原则,并根据供水周期性,依靠数量有限的测压点压力数据,结合管网的水力计算,利用传统的平差原理,将测压点以外的其它节点压力进行真实性校正,推算出了管网各节点的真实压力值,实现了通过有限测压点数据对管网所有节点压力的全面了解。     

黑龙江省高速公路ETC车道布设的研究

结合黑龙江省高速公路的ETC的实际需求,及车辆运行特性,对ETC专用收费车道的布设进行了研究,详细描述了ETC车道宽度、长度、及车速的设置。提出了ETC车道设备的配置和布设方案。并针对ETC系统使用中常见的问题给出了解决方法。     

关于石油管道设备的维修与保养探析

本文首先阐述了化工设备管道维护的重要性,接着从管道的保温,保冷,防腐,巡检,检修等几个方面依次展开分析,并分别提出了管道维护保养的措施。