MOLECULAR STATIC SIMULATION OF ENERGY FEATURESOF INTERACTION BETWEEN GRAIN BOUNDARYAND DISLOCATIONS IN Ni＿3Al ALLOY

ＭＯＬＥＣＵＬＡＲＳＴＡＴＩＣＳＩＭＵＬＡＴＩＯＮＯＦＥＮＥＲＧＹＦＥＡＴＵＲＥＳＯＦＩＮＴＥＲＡＣＴＩＯＮＢＥＴＷＥＥＮＧＲＡＩＮＢＯＵＮＤＡＲＹＡＮＤＤＩＳＬＯＣＡＴＩＯＮＳＩＮＮｉ＿３ＡｌＡＬＬＯＹＣｈｅｎ，Ｄａ；Ｌｕ，Ｍｉｎ；Ｌｉｎ，Ｄｏｎｇ...     

SOLIDIFICATION OF Zn－Pb ALLOY UNDER SIMULANT MICROGRAVITY CONDITION OF ORTHOGONAL ELECTRIC AND MAGNETIC FIELDS

ＳＯＬＩＤＩＦＩＣＡＴＩＯＮＯＦＺｎ－ＰｂＡＬＬＯＹＵＮＤＥＲＳＩＭＵＬＡＮＴＭＩＣＲＯＧＲＡＶＩＴＹＣＯＮＤＩＴＩＯＮＯＦＯＲＴＨＯＧＯＮＡＬＥＬＥＣＴＲＩＣＡＮＤＭＡＧＮＥＴＩＣＦＩＥＬＤＳ￥Ｚｈａｏ，Ｊｉｕｚｈｏｕ；Ｇｕｏ，Ｊｉｎｇｊｉｅ；Ｊｉ...     

SOLIDIFICATION AND MICROSEGREGATION BEHAVIORS OF NICKEL-BASE SINGLE CRYSTAL SUPERALLOY SOLIDIFIED AT MEDIUM COOLING RATE

ＳＯＬＩＤＩＦＩＣＡＴＩＯＮＡＮＤＭＩＣＲＯＳＥＧＲＥＧＡＴＩＯＮＢＥＨＡＶＩＯＲＳＯＦＮＩＣＫＥＬＢＡＳＥＳＩＮＧＬＥＣＲＹＳＴＡＬＳＵＰＥＲＡＬＬＯＹＳＯＬＩＤＩＦＩＥＤＡＴＭＥＤＩＵＭＣＯＯＬＩＮＧＲＡＴＥ①ＤｕＷｅｉ,ＬｉＪｉａｎｇｕｏａｎ...     

THEORETICAL ANALYSIS AND DESIGN／CALCULATION FORMULAE FOR HYDRAULIC IMPACT MECHANISM

ＴＨＥＯＲＥＴＩＣＡＬＡＮＡＬＹＳＩＳＡＮＤＤＥＳＩＧＮ／ＣＡＬＣＵＬＡＴＩＯＮ　ＦＯＲＭＵＬＡＥＦＯＲ　ＨＹＤＲＡＵＬＩＣＩＭＰＡＣＴＭＥＣＨＡＮＩＳＭＨｅ；Ｑｉｎｇｈｕａ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｃｈａｎｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ，Ｃｅｎ...     

MECHANICAL ANALYSIS AND NUMERICAL CALCULATION OF BONDING STRENGTH MEASUREMENT BY INTERFACIAL INDENTATION METHOD

ＭＥＣＨＡＮＩＣＡＬＡＮＡＬＹＳＩＳＡＮＤＮＵＭＥＲＩＣＡＬＣＡＬＣＵＬＡＴＩＯＮＯＦＢＯＮＤＩＮＧＳＴＲＥＮＧＴＨＭＥＡＳＵＲＥＭＥＮＴＢＹＩＮＴＥＲＦＡＣＩＡＬＩＮＤＥＮＴＡＴＩＯＮＭＥＴＨＯＤ①ＹｉＭａｏｚｈｏｎｇ１,ＨｕａｎｇＢａｉｙｕｎ１,...     

CALCULATION OF THREE－DIMENSIONAL SOLDER JOINT FORMATION IN MICROELECTRONIC SURFACE MOUNT TECHNOLOGY

ＣＡＬＣＵＬＡＴＩＯＮＯＦＴＨＲＥＥ－ＤＩＭＥＮＳＩＯＮＡＬＳＯＬＤＥＲＪＯＩＮＴＦＯＲＭＡＴＩＯＮＩＮＭＩＣＲＯＥＬＥＣＴＲＯＮＩＣＳＵＲＦＡＣＥＭＯＵＮＴＴＥＣＨＮＯＬＯＧＹ￥Ｇ．Ｚ．Ｗａｎｇ,Ｃ．Ｑ．ＷａｎｇａｎｄＹ．ＹＱｉａｎ（Ｎａｔｉｏｎａ...     

MATHEMATICAL MODEL AND COMPUTER SIMULATION OF MOISTURE TRANSFER PROCESS DURING SINTERING

ＭＡＴＨＥＭＡＴＩＣＡＬＭＯＤＥＬＡＮＤＣＯＭＰＵＴＥＲＳＩＭＵＬＡＴＩＯＮＯＦ　ＭＯＩＳＴＵＲＥＴＲＡＮＳＦＥＲＰＲＯＣＥＳＳＤＵＲＩＮＧＳＩＮＴＥＲＩＮＧＺｏｕ；ＺｈｉｙｉＨｕａｎｇ；ＴｉａｎｚｈｅｎｇＹａｎｇ；ＸｉａｏｓｈｅｎｇＣｈｅｎ；Ｊｉ（...     

FEM SIMULATION OF BIMETAL FORMING PROCESS BASED ON FRICTIONAL ELEMENT TECHNOLOGY

ＦＥＭＳＩＭＵＬＡＴＩＯＮＯＦＢＩＭＥＴＡＬＦＯＲＭＩＮＧＰＲＯＣＥＳＳＢＡＳＥＤＯＮＦＲＩＣＴＩＯＮＡＬＥＬＥＭＥＮＴＴＥＣＨＮＯＬＯＧＹＰｅｎｇＹｉｎｇｈｏｎｇ；ＷａｎｇＬｉｄｏｎｇ；ＬｉＸｉａｏｃｈｕｎ；ＲｕａｎＸｕｅｙｕ（Ｄｅｐｔａｒｔｍｅｎ...     

ELECTROCHEMICAL STUDIES ON THE MECHANISM OF GOLD DISSOLUTION IN THIOSULFATE SOLUTIONS

ＥＬＥＣＴＲＯＣＨＥＭＩＣＡＬＳＴＵＤＩＥＳＯＮＴＨＥＭＥＣＨＡＮＩＳＭＯＦＧＯＬＤＤＩＳＳＯＬＵＴＩＯＮＩＮＴＨＩＯＳＵＬＦＡＴＥＳＯＬＵＴＩＯＮＳＺｈｕ，Ｇｕｏｃａｉ；Ｆａｎｇ，Ｚｈａｏｈｅｎｇ；Ｃｈｅｎ，Ｊｉａｙｏｎｇ（ＩｎＳｔｄｕｔｅｏｆＣｈ...     

NUMERICAL SIMULATION OF ALTERNATIVE HORIZONTAL LEVITATION ELECTROMAGNETIC CONTINUOUS CASTING（Ⅱ）

ＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＯＦＡＬＴＥＲＮＡＴＩＶＥＨＯＲＩＺＯＮＴＡＬＬＥＶＩＴＡＴＩＯＮＥＬＥＣＴＲＯＭＡＧＮＥＴＩＣＣＯＮＴＩＮＵＯＵＳＣＡＳＴＩＮＧ（Ⅱ）￥ＺｈｕＳｈｏｕｊｕｎ；ＲｅｎＺｈｏｎｇｍｉｎｇ；ＤｅｎｇＫａｎｇ；Ｊｉａｎ...     

FUZZY ADAPTIVE CONTROL MODEL FOR PROCESS IN NICKEL MATTE SMELTING FURNACE

ＦＵＺＺＹＡＤＡＰＴＩＶＥＣＯＮＴＲＯＬＭＯＤＥＬＦＯＲＰＲＯＣＥＳＳＩＮＮＩＣＫＥＬＭＡＴＴＥＳＭＥＬＴＩＮＧＦＵＲＮＡＣＥＭｅｉ，ＣｈｉＰｅｎｇ，ＸｉａｏｑｉＺｈｏｕ，Ｊｉｅｍｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＡｐｐｌｉｅｄＰｈｙｓｉｃｓａｎｄＨｅａ...     

大规格电镦侧模辅助成形方法及装置研究

本文主要针对大规格电镦过程中形状缺陷和晶粒粗化等问题,提出了大规格电镦侧模辅助成形方法并设计了电镦侧模辅助成形装置,为大规格电镦生产提供新思路和方法.在Mdrc分析平台建立多尺度电镦工艺有限元分析模型及侧模辅助成型模型,对比两种成型方法模拟结果,发现电镦侧模辅助成形方法既能优化电镦件的形状避免宏观缺陷,又能有效的调控微...     

基于模糊层次分析的动态联盟伙伴选择策略

论述了基于模糊层次分析(AHP)的动态联盟伙伴选择策略。综合运用AHP方法和模糊决策方法构建了动态联盟伙伴选择的排序模型 ,通过求解该模型来得到参考排序值 ,力求使排序的结果能够客观、公正地反映不精确决策所蕴含的客观规律 ,以保证选择策略的准确性     

基于LCCBPO气动与电动执行器系统成本研究

以工业现场最常用的三组气动执行器和电动执行器系统为研究对象,分析了气动执行器和电动执行器的主要成本因素,基于生命周期成本LCC(life cycle cost),建立了两种执行器的LCCBPO(Life-cycle Costing Based on Product Owner)评价基准和计算模型。两种执行器的LCCBPO主要包括:购置成本、运行维护成本和报废回收成本。通过三组气动和电动执行器在常见工况下的应用数据,进行LCCBPO分析和验证。结果表明:在同样的负载能力和行程的条件下,气动执行器的购置成本比电动执行器低;有杆气缸的运行维护成本比电动执行器成本低;气动执行器的报废回收成本比电动执行器低。在点到点搬运工况下,气动执行器的全生命周期成本比电动执行器更经济实惠。     

Computational analysis of a twin-electrode DC submerged arc furnace for MgO crystal production

A twin-electrode DC arc furnace has been designed for MgO crystal production and this technique has been found to be another effective method to grow high quality MgO single crystals. Compared with AC submerged arc furnaces, the benefits of DC furnaces are significant. However, the magnetohydrodynamic effects might inhibit the growth of large single crystals. In order to understand the process we present a three-dimensional numerical model of the DC furnace. Coupled with Maxwell's equations, the conservation equations for mass, momentum, and energy are solved with ANSYS. It is found that the shape of the melt-solid interface is significantly affected by the electromagnetic stirring, and the predicted shape of the molten bath shows good agreement with the experiments. It is observed that the environment is more suitable for the crystal growth between each electrode bottom and the shell. These interesting phenomena may be caused by the variation of the flow field which is quantitatively described in the model. Other detailed information including the electric power and the voltage drop distribution is also given approximately by the model to give decision support for the power control system.     

乙烯裂解炉管的红外热像检测与在线剩余寿命评估

在高温合金剩余寿命预测理论研究的基础上，研制了一套红外热成像在线剩余寿命评估系统，实现了裂解炉管方便而快捷的在线检测与评估。研究结果在某厂鲁姆斯SRT－Ⅳ型乙烯裂解炉上得到成功应用，在运行状况下进行了炉管表面温度场的红外热像测试和剩余寿命预测，为厂方决策提供了科学依据。     

Rapid prototyping of electrically conductive components using 3D printing technology

A method of rapid prototyping of electrically conductive components is described. The method is based on 3D printing technology. The prototyped model is made of plaster-based powder bound layer-by-layer by an inkjet printing of a liquid binder. The resulting model is highly porous and can be impregnated by various liquids. In a standard prototyping process, the model is impregnated by epoxy or polyurethane resin, wax solution, etc. In the test described in this paper, to obtain the electric conductivity, the model has been impregnated by a dispersion of carbon nanofibers (CNF) in epoxy resin. Surface resistivity of the model below 800 Ω/sq has been obtained when impregnated by a mixture containing less than 4 wt.% CNF. Volume resistivity of the molded and hardened CNF dispersion used for model impregnation have also been measured and a value less than 200 Ω cm has been obtained at 3 wt.% CNF content. Unexpectedly, the onset of electric conductivity (percolation threshold) occurred at lower mass fraction of CNF for a dispersion containing CNF agglomerates, when compared to the mixture with well uniformly dispersed fibers. This happened both for the impregnated model and for the molded CNF dispersion itself. An explanation of this phenomenon, based on percolation theory is given.     

Relaxation of Output Characteristics of Electrohydrodynamic Pumps

The principle of operation of an electrohydrodynamic pump (EHDP) is explained. Research problems are formulated for the study of the patterns and peculiarities of the operation of the EHDP for the purpose of its optimization. The experimental facility is described and the peculiarities of the relaxation of the output characteristics of a single-stage EHDP are determined. The dependences of the pressure and current characteristics on the time and voltage (dc) supplied to the EHDP are presented. New results related to very long operation of EHDPs are revealed, e.g., the fact that the pressure characteristics are fluctuating time functions. A theoretical model of the electric current transfer in an EHDP is presented, which is based on an analog electrical circuit.     

Time dependence of the mass transfer during electroseparation

A one-dimensional problem of mass transfer during electroseparation in an electric filter has been formulated taking into account its design features. The ultimate objective of this study is the determination of the concentration at the outlet of the electric filter as a function of time, which is the characteristic used in the practical operation of electric filters and in experimental research. To that end, we have divided the space of the electric filter into two zones: an emitter (purification) zone and a collector zone. The problem is solved through averaging over the entire volume of the electric filter and the specified zones. Finally, the problem reduces to the approximation of the concentration and its coordinate derivative in the boundary plane that separates the emitter and collector zones. In addition, the concentration is approximated via introducing an averaging parameter, and its derivative is approximated on the basis of the boundary layer concept. Owing to solving the derived differential equation, we represent partial solutions that are consistent with the experimental data.     

PLC、变频器技术在车床系统改造中的应用

传统车床的主轴电机常采用机械齿轮箱进行有级调速,采用机械换向机构实现正反转控制.本文从CA6140型车床对控制系统的要求出发,用PLC、变频器对系统进行改进,给出了一个更为高效节能、安全可靠、操作便捷的改进方案.