伺服系统中USB人机接口的设计与实现

针对传统伺服系统串口通信速率慢、可扩展性差等不足,设计了应用于伺服系统中的USB人机接口.采用32位浮点DSP芯片TMS320F28335为控制核心,PDIUSBD 12为USB器件,并基于实时操作系统DSP/BIOS实现了USB驱动程序以及伺服管理软件,通过与PC端管理软件协同工作,完成伺服系统与PC主机的交互.经验证USB接口数据传输的正确性和可靠性能满足伺服系统中数据实时显示以及系统调试的要求,为伺服中数据采集系统以及高级调试工具的开发奠定基础.     

基于ARM与DSP的嵌入式管焊控制平台

设计并实现了一种由企业管理层、现场管理层、现场控制层组成的管焊控制平台。采用ARM-Linux操作系统和S3C2440A芯片设计了现场管理层ARM节点,采用跨系统的图形界面Qt/Embedded设计应用程序。采用DSP/BIOS嵌入式实时操作系统和TMS320F2812芯片设计了现场控制层的DSP节点。节点之间通过CANopen协议通讯并采用高精度时间协议(Precision Time Protocol,PTP)实现精准授时,通过优先级配置与通讯调度提高了系统的实时性与可靠性。平台运行按照状态机转换经过通讯实现多节点同步控制完成焊接过程。嵌入式管焊平台体积小、扩展性好,能满足脉冲管板、管管焊接过程节点之间协调控制的精确同步和实时性要求。     

基于DSP/BIOS的运动控制系统设计

介绍了一种基于DSP/BIOS内核的运动控制系统设计方法,利用DSP/BIOS内核基于任务优先级的多线程机制,实现对伺服电机运动控制的实时处理,包括运动系统的任务调度、运动轨迹算法以及与硬件设备的通信等.所设计的运动控制系统在三轴运动平台上测试,其在性能和功能上达到了预期效果.     

数字信号处理器DSP主控GMAW焊接

阐述了焊接过程信息数字处理控制思想，实际研究了数字信号处理器9DSP）在CO2气体保护焊机中的应用，将数字信号处理器（DSP）在送丝系统的柔性化调节，引弧和收弧模式，焊接参数的一元化自调节等方面的应用作了研究和试验，通过研究和样机试验，建立了一套焊接电源的数字化，信息化，柔性化控制平台，并探讨了数字信号处理器（DSP）在CO2焊接领域中的应用优点和前景，并提出了DSP主控GMAW焊接电源全系统框图，试验证明该系统工作稳定可靠，较好地满足了工艺性能，实现了焊机控制的数字化。     

基于CAN总线分布式控制送丝系统研究

分布式控制系统是焊接系统自动化的发展方向,要求每个设备更加智能化,具有网络通信能力。本文给出完整的分布式控制送丝系统设计方案,利用32位ARM+DSP芯片TMS320F28M35x作为硬件核心,使用实时操作系统μC/OS-Ⅱ作为软件平台,同时对该送丝系统的任务和流程进行了详细阐述,并提出积分分离PID控制算法,提高系统的暂态特性。     

基于CAN总线分布式双电源协同控制系统

双丝系统中两个电源之间的时序协同控制是焊接效果的重要影响因素。利用双CAN总线方案,既能解决电源的分布式控制,又能完成双电源协同控制问题。利用32位ARM+DSP芯片TMS320F28M35x作为硬件核心,使用实时操作系统μC/OSⅡ作为软件平台,给出完整的分布式控制双丝焊电源方案,阐述了该电源系统的任务和流程。对CAN总线解决电源协同控制问题所产生的时间延迟给出了补偿方法。     

精密逆变电阻点焊电源DSP控制系统

为了提高逆变电阻点焊的控制精度，完善电源的功能，设计了一种基于DSP的逆变电阻点焊的控制电路。该控制电路沮DSP芯片dsPIC30F6010为核心，包括多信息检测、D／A输出控制、键盘与LCD显示、I／O接口、故障检测、串行通讯接口等电路。试验表明，该系统响应速度快、控制精度高，实现了多参数的监控和故障诊断。     

基于TMS320C240 DSP的龙门铣床控制系统应用

TMS320C24X是专为电机数字控制和其它控制应用系统而设计的系列DSP芯片，针对龙门铣床直流拖动控制系统。设计了以TMS320C240 DSP为控制核心与单片机相结合的数字控制系统，介绍了系统的硬件组成和软件设计算法，实际运行结果表明该系统具有良好的动态性能和较高的速度控制精度。     

新型DSP在数控机床伺服系统中的应用研究

介绍了一种新型的电机控制专用芯片DSP56F80X，并结合DSP56F80X推导出空间矢量PWM（SVPWM）的数字算法，最后给出了二者在数控机床伺服系统中的应用。实验证明，本文系统具有良好的动静态性能。     

数字信号处理器在CO2焊接中的应用

阐述了焊接过程信息数字处理控制思想。对数字信号处理器（DSP）在CO2气体保护焊机中的应用：送丝系统的柔性化调节、引弧和收弧模式、焊接参数的一元化自调节等方面进行了探讨。通过研究和样机试验，建立了一套焊接电源的数字化、信息化、柔性化控制平台，并探讨了数字信号处理器（DSP）在CO2焊接领域中的应用优点和前景。试验证明，该系统工作稳定可靠，较好地满足了工艺性能，基本实现了焊机控制的数字化。     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

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.     

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.     

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.     

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.