Development of a simple model for batch and boundary information updation for a similar ship’s block model

In early 2000,large domestic shipyards introduced shipbuilding 3D computer-aided design (CAD) to the hull production design process to define manufacturing and assembly information.The production design process accounts for most of the man-hours (M/H) of the entire design process and is closely connected to yard production because designs must take into account the production schedule of the shipyard,the current state of the dock needed to mount the ship’s block,and supply information.Therefore,many shipyards are investigating the complete automation of the production design process to reduce the M/H for designers.However,these problems are still currently unresolved,and a clear direction is needed for research on the automatic design base of manufacturing rules,batches reflecting changed building specifications,batch updates of boundary information for hull members,and management of the hull model change history to automate the production design process.In this study,a process was developed to aid production design engineers in designing a new ship’s hull block model from that of a similar ship previously built,based on AVEVA Marine.An automation system that uses the similar ship’s hull block model is proposed to reduce M/H and human errors by the production design engineer.First,scheme files holding important information were constructed in a database to automatically update hull block model modifications.Second,for batch updates,the database’s table,including building specifications and the referential integrity of a relational database were compared.In particular,this study focused on reflecting the frequent modification of building specifications and regeneration of boundary information of the adjacent panel due to changes in a specific panel.Third,the rollback function is proposed in which the database (DB) is used to return to the previously designed panels.     

CAN总线在电动汽车BMS系统与充电桩之间通信的应用

电动汽车是我国新能源战略重点之一,国家电网公司为此积极展开电动汽车充电站的建设。国家电网将按照换电为主、插充为辅,集中充电、统一配送为基本商业模式,加快电动汽车充换电站的布局和建设。不论是插充方式还是集中充电,电动汽车的普及都离不开充电智能化,而BMS与充电桩或其他充电设备的无缝连接正是实现充电智能化的必要条件。文章提出了BMS管理系统与充电桩之间的通信设计方案,利用CANBUS实现BMS管理系统与充电桩的通讯,介绍了CAN通讯的硬件设计和软件设计,并经过与充电桩的反复测试,实现了BMS管理系统与充电桩的通信。     

乙炔吸收系统倒开车实现装置产品快速合格

中国石油吉林石化公司聚乙烯厂700kt/a乙烯装置老区采用溶剂吸收技术脱出乙炔精制乙烯工艺。多年来,乙炔吸收塔塔顶回流泵开车初期不上量问题一直制约着装置开车进度。经过摸索,技术人员尝试对开车流程进行调整,攻克了难题。文中对该装置具体的调整措施进行了阐述。     

空气压缩机组联动控制系统改造

本文分析空压机原联动控制系统的运行特点，对系统进行改造，利用自制电子式两位差动可调控制器取代压力控制器，克服原系统的缺陷。达到了改造的目的。     

一种多功能网络监控与防御平台设计与实现

本文提出了一种多功能网络监控与防御系统。文中根据网络自身的结构,从骨干层、汇聚层、接入层三个层次分析,采用三层设计模式,它们相互独立又相互协作,共同构成高性能、多层次、多功能综合解决方案。形成深度防御体系,最大限度地保护企业和组织的网络安全。     

海水铝-空气燃料电池

叙述了海水－铝空气燃料电池的特性及影响电池功率输出的主要因素，如海水的电导、盐度、温度、铝材料的选择等。试验结果表明，电池工作时正负极之间的液相电阻比海水本身的电阻小得多，但是其液相电阻仍然偏大。海水盐度和温度的变化引起电极电势波动，盐度影响占１０％左右。高纯铝合金电极工作电势比工业铝合金电极的工作电势高２００ｍＶ以上。     

住宅用全热回收换气机防结霜的研究

本文针对住宅用新风换气机在冬季运行时,在其排风侧出现结霜现象,以实验测定为研究手段,选用板翅式全热交换器作为能量回收装置,设计加工了防结霜住宅用全热回收换气机样机。样机安装在标准的住宅内,测定了该换气机在冬季运行时,其结霜点的温度随室内外空气温湿度的变化情况,总结其结霜的变化规律,得出通过新风预热能够有效地防止换气机冬季结霜现象的发生,使其应用得到进一步的推广的结果。     

考虑几何非线性的结构形状优化灵敏度分析

基于非线性增量有限元理论,给出了全拉格朗日描述下的空间结构优化设计有限元刚度表达式,导出了考虑几何非线性项的结构形状优化位移灵敏度和应力灵敏度的计算公式,并通过数值算例验证了公式的正确性和有效性,同时表明灵敏度分析中,考虑几何非线性项将显著提高优化设计的效率和精度。     

三里屯Village的开放实验——开放城市中的开放建筑

城市生活是街道对面的小市场，是拐角处的露天影院，是飘香的熟食店，是饱餐后仍驻足停留的面包房，是扣动心弦的影片，是对熟悉的重新发现，是你我的对话。     

DK5-1600智能型低压真空断路器

DK5－1600智能型低压真空断路器是联合开发的新产品。本文介绍该产品的适用范围、结构、原理、特点、基本参数和技术性能及主要应用。