盾构同步注浆试验平台相似性的研究

以相似理论为前提，结合盾构注浆试验平台设计的相关理论和运用层次分析法求解权值来得到总体相似度的方式，解决平台设计过程中如何实现对相似程度的判断问题，得到的结论为同步注浆平台研制提供了理论依据。     

基于NX二次开发的自动点焊工位仿真与建模环境交互的研究

自动点焊是提高生产效率和制造质量的重要途径，如何规划机器人焊接轨迹是实现自动焊接的关键。针对自动点焊工位，基于NX二次开发，结合SIEMENS工业仿真软件Tecnomatix平台下仿真结果，分析自动点焊焊接轨迹。根据坐标相似变换理论，分析工作坐标系相对于绝对坐标系旋转变换的过程，推出相应的变换矩阵即程序的核心算法。借助C++语言平台依据NXOPEN API帮助文档调用UFUN函数进行程序开发。经仿真得到的机器人的焊接轨迹即TCF位姿以批量创建坐标系的形式进入NX，机器人工具侧焊枪3D数据对应各个坐标系批量导入，最终实现仿真数据与NX中的设计数据相结合。在设计端获得焊枪与其他装备的干涉状况，结果表明该程序具有较好的实用性和可靠性。     

基于柔性模块和产品族的液压机快速设计

为使液压机设计快速响应市场需求，提出了基于柔性模块和产品族的液压机快速设计理论。柔性模块是对产品结构用参数化和模块划分得到的一组具有典型模块接口的参数化模型，产品族是具有相似功能和结构的一类产品的总和。在对液压机进行柔性模块划分和产品族规划的基础上，以上梁模块为例说明了产品快速设计的方法和过程。     

过滤器净化金属液机理及含过滤器的浇注系统设计

通过对铸件的浇注系统、夹杂物的来源及金属液体流态进行的分析和氢气泡流体动力学实验，得出过滤器挡渣的主要功能是对浇注系统的液态金属“整流”的结果，并采用相似理论，通过水力模拟实验，利用最小二乘法得到过滤器流动阻力的表达式，进而得到含过滤器浇注系统的设计方法。     

高速列车转向架装配CAPP系统研究

结合高速列车谱系化技术平台及系列车型研制的需求,以特征相似性分析为基础构建了高速列车转向架装配CAPP系统,实现了高速列车转向架装配工艺的快速变型设计。该系统首先输入转向架的CAD模型并从模型中提取出设计特征和工艺特征(即装配特征),然后以设计特征和装配特征为基础,将模板项目和实例项目进行相似度分析,得到相似度较高的模板车型,最后在模板的基础上做相应变型,生成新车型转向架的装配工艺规程。     

冲模CAD中实例匹配的相似度定量计算研究

对集成环境下基于CBR的冲模CAD系统中实例提取的关键技术——实例匹配的相似度定量计算进行了研究。依据冲压工件自身特征信息，按形状特征、精度特征和综合特征三方面进行了特征分类，采用特征建模的方法将产品设计数据转化为特征信息模型。根据待加工零件的特征信息，运用模糊数学中的模式识别等理论，重点讨论了冲压工件相似实例提取中的相似性定量计算方法问题，最终以相似性理论为基础，从总体相似度计算和设计特征相似度计算两个方面进行了深入探讨，得出了冲压工件问整体相似度计算方法。     

黄河泥沙非传统资源制备O＇-SiAlON／SiC耐火材料

利用黄河泥沙合成O’-SiAlON／SiC复相耐火材料，着重将胶态成型工艺应用到制备过程中，即利用注浆成型工艺制备坯体，使坯体结构更均匀，同时促进最终产物的生成。探索了注浆成型中各工艺参数对坯体性能的影响，利用正交实验对注浆成型工艺参数进行了优化设计，并得到最佳工艺参数，在此工艺条件下制备的坯体密度最高（1．86g／cm^3）-最终在较低的烧结温度下制备出O＇-SiAlON／SiC复相耐火材料，该材料具有相对较高的0’-SiAlON／SiC比及较少的杂质相含量。     

基于改进灰色关联的飞机结构件变型设计

飞机结构件具有典型的多品种、小批量特点,为了提高设计经验与设计知识的积累和重用,提出了基于改进灰色关联理论的实例检索与实例匹配的变型设计技术。以典型飞机结构件为例,以CATIA软件为平台,CAA为开发工具,建立飞机结构件实例库,运用改进灰色关联理论检索出飞机结构件实例库中与设计问题相似度最高的实例模型,利用CATIA中超级拷贝功能按照新的建模基准拷贝检索出的实例模型特征,然后对其进行模型特征的更改,完成飞机结构件的变型设计。该变型设计技术提高了飞机结构件设计质量与效率,减少了设计反复,提高了飞机结构件设计知识的重用。     

半主动控制方法对海洋平台结构振动控制效果的数值模拟及试验对比研究

采用半主动控制方法对海洋平台的振动进行控制,以一典型导管架式海洋平台为原型,根据动力相似准则按1∶ 50 比例设计海洋平台结构模型,以磁流变阻尼器为控制装置设计半主动控制系统,进行多工况减振效果的数值模拟,在此基础上,进行波浪水池试验研究,对比分析半主动控制系统控制效果的数值模拟结果与试验结果,讨论磁流变阻尼器自身刚度、质量对平台动力响应及减振效果的影响,给出磁流变阻尼器半主动控制系统对海洋平台结构振动的减振特点.     

泡沫陶瓷过滤器净化原理及含过滤器浇注系统的设计

对浇注系统、夹杂产生物来源及金属液体流态进行分析，氢气泡流体动力学实验表明，在浇注系统中过滤器的主要功能是对液态金属产生“整流”净化作用。采用相似理论通过水力模拟实验利用最小二乘法得到过滤器流动阻力的表达式，提出泡沫陶瓷过滤器在浇注系统中放置位置和放大截面积的设计方法。     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

Effect of Short-Time Aging on the Pitting Corrosion Behavior of a Novel Lean Duplex Stainless Steel 2002

The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel(LDSS) 2002 was investigated through the potentiostatic critical pitting temperature(CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm~2 compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr_2N and M_(23)C_6 along the ferrite–austenite grain boundaries.     

INTRODUCTION TO PATENTS

The invention provides a method of making a mold which can reduce SOx generation rate while preventing decrease in hardening rate in the case of using sulfuric acid for a hardener composition. The method has a mixture step in which fire-resistant particles, a hardener composition and a binder composition are mixed to obtain a composition for a mold. The hardener composition contains sulfuric acid. In the mixture step, sodium carbonate is added. A molar ratio of the sulfuric acid to the sodium carbonate is 0.5 or more and 4.0 or less.     

China Foundry Week 2014

China Foundry Week, hosted by the Foundry Institution of Chinese Mechanical Engineering Society （FICMES） each year, is a large academic event in China. It is one of the ten high-impact activities sponsored by the Chinese Mechanical Engineering Society.     

17th Conference of Hydrodynamic and Electromechanical Control Engineering Call for papers

正1.Contents In order to promote the academic exchanges and technical communication of the research in the field of fluid power transmission and control,fluid control engineering specialized committee of the Chinese Society of Theoretical and Applied Mechanics will hold the 17th Conference of Hydrodynamic and Electromechanical Control Engineering on July 27-29,2014 in Tibet,Lhasa city.     

Information for Contributors

正The Transactions of Nonferrous Metals Society of China,founded in 1991 and sponsored by The Nonferrous Metals Society of China,is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology,including mineral processing,extraction metallurgy,metallic materials and heat treatments,metal working,physical metallurgy,powder metallurgy,with the emphasis     

Preface

<正>We are pleased to present this Special Issue of Transactions of Nonferrous Metals Society of China containing selected papers from the First Asian Conference on Aluminum Alloys(ACAA-2013),held in Beijing,China,13–17 October 2013.This conference has been initiated,with approval of     

Information for Contributors

The Transactions of Nonferrous Metals Society of China, founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, 1NSPEC, CA, METADEX, AJ and JICST.     

FORMULAS OF TENSION OF CONTINUOUS ROLLING PROCESS

The development of computer controlled continuous rolling process calls for a mathematical expression that can express the inequality condition of "constant flow". Tension is the link of the continuous rolling process. From the condition of dynamic equilibrium, a differential equation of tension is given out. On the basis of the physical rules established from the industrial practice and experimental studies, the law of volume constancy, the linear relation of forward slip and tension, the state equation of continuous rolling, the formula of dynamic tension, and the formula of static tension have been obtained. These formulae reflect the functional relations between tensions, thickness, roll velocity, and time in the continuous rolling process. It is implied that the continuous rolling process is a gradually steady, controllable, and measurable dynamic system. An assumption of predicting the thickness of a steel plate using these tension formulae is also put forward.     

Bulletin of the Awards in 2013

<正>Five reviewers and 9 published articles are selected as the Excellent Rewewerand Excellent Article in 2013 respectively.Excellent Reviewers:Prof.Z ongyi Ma(Institute of Metal Research,CAS,C hina);Prof.Y ongbo Xu(Institute of Metal Research,CAS,C hina);Prof.Guangping Zhang(Institute of Metal Research,C AS,C hina);Prof.Z hendui Cui(Tianjin University,China);