基于ARM的光固化快速成形嵌入式网络控制系统研究

随着数字微镜光固化快速成形技术的发展应用,快速成形设备向桌面化、办公化方向发展已成为必然趋势。以S3C6410为基础开发的嵌入式光固化快速成形网络控制系统,通过建立嵌入式软硬件平台,分析嵌入式网络控制系统结构和方法,设计出网络控制应用软件,实现了远程监控的功能。其低成本、控制精度高、易移植等优点将促使快速成形控制系统新的发展。     

基于RTLinux的运动控制器MC400D的驱动程序设计

文章介绍一种由国防科技大学设计的用于机电系统中的运动控制卡MC400D在嵌入式实时操作系统RTLinux下的设备驱动程序的设计思想和设计流程,通过该驱动程序的设计,使得在RTLinux下原来基于Windows下的控制程序通过简单的软件移植后,能够实时的实现对机电系统的各种控制,并使机电产品的嵌入式实现成为可能.     

基于EtherMAC的新型实时伺服控制网关设计

为解决松下RTEX伺服控制器的开发依赖专用通信芯片MNM1221的问题,提出了一种基于EtherMAC的新型实时伺服控制网关的设计方案。将标准性、通用性更好的EtherMAC工业实时以太网与封闭的松下RTEX协议结合起来,通过研究EtherMAC与RTEX协议的运行机制与特点,设计了一种新型伺服控制网关软硬件方案,完成了两种协议结合的关键时序设计。实现了在不使用MNM1221专用芯片的情况下,将RTEX网络嵌入到EtherMAC总线中,并能对其进行灵活的应用。经Kithara实时运动平台上实验验证,设计的网关产品满足工业控制应用的要求。     

基于嵌入式网关的电焊机以太网接入方法研究

介绍了一种基于以太网的电焊机网络接入方法。随着以太网技术的迅猛发展，其应用于工业生产已成为重要的研究方向。利用嵌入式网关结合单片机控制系统实现了电焊机的以太网接入，可以使作为现场生产单元的电焊机与目前基于以太网和TCP／IP协议的企业信息系统无缝集成。从而使焊接生产过程的网络化和信息化以及电焊机的远程故障诊断成为可能。     

基于OPC技术的压铸车间远程监控系统

结合车间设备的信息化集成要求,介绍了基于OPC技术的压铸车间远程监控系统,包括远程监控系统网络架构、通讯模式以及监控终端的软硬件实现.监控终端通过OPC数据接口实现了与车间现场生产控制设备的远程数据交换.监控计算机采用组态王开发监控界面,实现了对车间内压铸机的远程监控与管理.     

CAN总线与以太网互连系统的设计

为了在过程控制领域实现以太网与现有CAN总线网的直接连接。保证管理监控层（以太网）与生产测控层（CAN总线网）之间的数据能方便地通信。文章详细介绍了一种CAN总线与以太网互连系统的设计方案,采用CAN总线和以太网混合控制网络,以Maxim公司推出的8051系列的DS80C400芯片作为核心处理器,利用嵌入式网络平台（TINI）作为开发平台,应用套接字技术及嵌入式网关技术,使得下层现场设备和上层监控网络之间的联系更加牢固,介绍了该系统的结构模型、硬件和软件的设计方案及工作原理,为工业过程控制网络的数据管理和远程控制提供了理论依据和方法。结果证明,这种方法性价比高,实用性强,非常适合工业控制领域。     

基于ARM的手持智能终端系统的搭建

针对基于ARM的手持智能终端操作系统移植进行研究.该系统CPU采用基于ARM7TDMI内核的S3C44B0X微处理器;以功能强大而源码免费开放的Linux系统作为开发环境,同时采用专门针对微控制领域而设计的μClinux作为目标系统的操作系统.实验结果表明预期目标实现,提高系统的可靠性、稳定性,实现网络互联,同时为智能终端系统提供良好的多任务多用户的交互界面.     

基于嵌入式Linux系统的MiniGUI的移植研究

随着嵌入式系统的广泛应用,用户对人机交互界面的易交互性、实时性、可配置性提出了更高的要求,嵌入式GUI成为当前研究的一个热门领城,拥有广阔的应用前景.文章详细介绍了MiniGUI的移植步骤,阐述了交叉编译环境的建立过程、MiniGUI的库文件和资源文件的移植方法、MiniGUI运行环境的配置.最终实现了对S3C2410开发板的MiniGUI移植,完成了嵌入式Linux图形用户界面的构建.     

基于物联网的温室大棚智能监控系统研究

针对温室大棚应用过程中存在劳动力需求大、作物生长环境参数采集不精准的问题,设计了基于物联网的温室大棚智能监控系统,以实现减少劳动力、作物生长环境参数的精准采集、灌溉设备的远程控制等。传感器节点实时采集各路的数据传输到网关,并通过GPRS模块传输到服务器,利用GPRS无线通信和Internet网络实现人机通信交互,完成对现场农作物生长环境的监测;同时,服务器根据土壤的实际湿度与农业知识专家库对比进行控制决策,并通过网关向灌溉装置发送灌溉指令,实现灌溉的远程控制。该系统在新疆塔城地区应用实验表明:系统运行稳定,具有较好的鲁棒性,能够达到预期设计的目标。     

基于以太网的电焊机网络控制系统

介绍了一种基于以太网的电焊机网络控制系统。随着以太网技术的迅猛发展，以太网应用于工业生产已成为重要的研究方向，利用嵌入式网关模块结合单片机控制系统实现了电焊机的以太网接入，可以使作为现场生产单元的电焊机与目前基于以太网和TCP/IP协议的企业信息系统无缝集成，从而使焊接生产过程的网络化和信息化及电焊机的远程故障诊断成为可能。同时设计了网络电焊机管理系统，并利用SQL SERVER软件构建了基于Web的焊接规范数据库和焊接生产过程监测数据库。整个系统可以实现焊接规范参数数据库的维护、电焊机参数远程监控和焊接规范的远程设置与网络化管理。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

Thermodynamics Study on the Decomposition of Chromite with KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

Influence of Heat Treatment on Damping Behaviour of the Magnesium Wrought Alloy AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

Using Finite Element and Contour Method to Evaluate Residual Stress in Thick Ti-6Al-4V Alloy Welded by Electron Beam Welding

This work was to reveal the residual stress profile in electron beam welded Ti-6Al-4V alloy plates(50 mm thick) by using finite element and contour measurement methods.A three-dimensional finite element model of 50-mmthick titanium component was proposed,in which a column–cone combined heat source model was used to simulate the temperature field and a thermo-elastic–plastic model to analyze residual stress in a weld joint based on ABAQUS software.Considering the uncertainty of welding simulation,the computation was calibrated by experimental data of contour measurement method.Both test and simulated results show that residual stresses on the surface and inside the weld zone are significantly different and present a narrow and large gradient feature in the weld joint.The peak tensile stress exceeds the yield strength of base materials inside weld,which are distinctly different from residual stress of the thin Ti-6Al-4V alloy plates presented in references before.     

Microstructures and Tensile Properties of Ultrafine-Grained Ni–(1–3.5) wt% SiC_(NP) Composites Prepared by a Powder Metallurgy Route

Silicon carbide nanoparticle-reinforced nickel-based composites(Ni–Si CNP),with a Si CNPcontent ranged from1 to 3.5 wt%,were prepared using mechanical alloying and spark plasma sintering.In addition,unreinforced pure nickel samples were also prepared for comparative purposes.To characterize the microstructural properties of both the unreinforced pure nickel and the Ni–Si CNPcomposites transmission electron microscopy(TEM) was used,while their mechanical behavior was investigated using the Vickers pyramid method for hardness measurements and a universal tensile testing machine for tensile tests.TEM results showed an array of dislocation lines decorated in the sintered pure nickel sample,whereas,for the Ni–Si CNPcomposites,the presence of nano-dispersed Si CNPand twinning crystals was observed.These homogeneously distributed Si CNPwere found located either within the matrix,between twins or on grain boundaries.For the Ni–Si CNPcomposites,coerced coarsening of the Si CNPassembly occurred with increasing Si CNPcontent.Furthermore,the grain sizes of the Ni–Si CNPcomposites were much finer than that of the unreinforced pure nickel,which was considered to be due to the composite ball milling process.In all cases,the Ni–Si CNPcomposites showed higher strengths and hardness values than the unreinforced pure nickel,likely due to a combination of dispersion strengthening(Orowan effects) and particle strengthening(Hall–Petch effects).For the Ni–Si CNPcomposites,the strength increased initially and then decreased as a function of Si CNPcontent,whereas their elongation percentages decreased linearly.Compared to all materials tested,the Ni–Si CNPcomposite containing 1.5% Si C was found more superior considering both their strength and plastic properties.     

Directional Growth of Tin Crystals Controlled by Combined Solute Concentration Gradient Field and Static Magnetic Field

A new method was introduced to achieve directional growth of Sn crystals. Microstructures in liquid(Pb)/liquid(Sn) diffusion couples were investigated under various static magnetic fields. Results show that the β-Sn crystals mainly reveal an irregular dendritic morphology without or with a relatively low static magnetic field(B0.3 T). When the magnetic field is increased to 0.5 T, the β-Sn dendrites close to the final stage of growth begin to show some directional character. With a further increase in the magnetic field to a higher level(0.8–5 T), the β-Sn dendrites have an enhanced directional growth character, but the dendrites show a certain deflection. As the magnetic field is increased to 12 T, the directional growth of the β-Sn dendrites in the center of the couple is severely destroyed. The mechanism of the directional growth of the β-Sn crystals and the deflection of the β-Sn crystals with the application of static magnetic field was tentatively discussed.     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.