虚拟环境下的生产线三维动态仿真及其建模

文章分析了虚拟环境下生产线仿真和建模的特点,对比面向对象与Agent的建模方法,提出用多Agent来描述生产线的主要特征及动态仿真系统,用触发事件的消息传递机制实现系统的行为控制函数,建立了生产线系统模型.采用WTK平台实现生产线仿真系统,并且例举了两个不同的工程应用例子来说明生产线系统模型的有效性和通用性,为企业生产线的布局与决策提供了有力的工具.     

基于AUML构建多Agent敏捷制造调度系统

AUML(Agent Unified Modeling Language)是一种FIPA(Foundation of Intelligent Physical Agents)和OMG(Object Management Group)都推荐使用的多Agent系统建模技术,本文尝试采用AUML技术来实现对多Agent敏捷制造调度系统的建模。通过扩展UML类图,描述了系统中Agent的结构和它们之间的关系。还采用了对UML的另一扩展:AUML协议图,来进一步详述了Agent之间的主要交互活动。     

基于Matlab统一环境的生产线混杂系统建模与分析

研究基于MATLAB统一环境构建针对生产线混杂动态行为机制的建模与分析技术,采用层次结构建模方法,应用SIMEVENTS描述生产线顶层的离散事件行为,以STATEFLOW为核心构建生产单元模型,作为沟通上层离散行为与底层控制器连续过程的桥梁,而底层生产设备控制器的连续控制过程则由SIMULINK来描述.所建系统在固高柔性制造系统进行了验证.所形成的基于MAT-LAB的统一生产线信息与事件集成环境,可作为生产线混杂动态行为的建模、仿真与性能分析工具.     

机器人的多Agent系统设计与分析

机器人设计制造是一跨学科的、创造性的工作。文章首先对多Agent系统分析方法进行了介绍。然后，运用多Agent分析方法对机器人进行分析，把机器人分为4个基本Agent，并以投球Agent为例说明单个Agent的设计分析方法。最后，以这次设计的经验分析了多Agent系统分析方法的优点。     

数控设备Agent化方法及其应用研究

数控设备Agent化模型是Agent化方法研究的核心内容之一.文章以数控铣削加工中心为研究对象,简述了多Agent系统,并对制造资源Agent化过程进行分析,提出了元Agent的概念,总结出一种数控设备Agent化模型.运用相关传感器对铣削加工过程中刀具三位力信号进行采集及分析,建立异构加工中心之间的通信,并在该模型基础上,开发出了应用于生产实践的远程监控及调度系统.试验结果表明,该系统具备较好的实用性和经济性.可以应用推广于中小型企业.     

基于Agent反、正向招投标技术的Job Shop调度研究

分析了目前基于多Agent技术的Job Shop调度研究所存在的问题，对Job Shop调度问题进行了形式化描述，给出了基于多Agent的总体调度结构和调度过程，提出了基于柔性工艺路线的虚拟制造单元和Agent的反、正向招投标调度机制，描述了具体实现过程，给出了招标、投标、评标的参数和指标，通过示例验证了该方法的有效性。所提方法在Agent招投标中直接考虑了工序任务间的约束和联系，即充分发挥了多Agent系统分散决策的优势，又从根本上避免了任务分配的冲突，提高了调度效率。     

基于Multi—agent的分布式专家系统协作机制

探索了基于Internet/Intranet松耦合环境设计分布式选矿专家系统DMPES,采用面向Agent的系统开发方法和Multi-agent分布协作求解模式,基于DCOM技术,以C＋＋构建框架类加速了Agent的实现。文中提及的智能主体的通信机制,协同求解中的领域问题描述,协商及分布式协作机制的建立思想对复杂问题求解提供了支持。DMPES系统在网络环境下基于Windows NT-WorkStation采用C＋＋开发实现,这里描述的协作机制已在该系统中获得应用,运行结果表明其具有较好的性能。     

UML Statechart在嵌入式数控系统软件中的应用研究

针对数控系统复杂行为的描述和控制,分析了采用有限状态机方法的利弊,提出了采用UML Statechart的系统行为描述方法.应用该方法对一嵌入式数控系统的软件开发进行了尝试,给出了系统任务管理器对象的UML Statechart及其实现方式.结果表明,该方法有效地简化了行为描述,提高了行为描述的可读性,降低了数控系统软件的实现难度.     

一个基于CORBA的多Agent系统框架

多Agent系统是目前人工智能研究领域的一个热点,Agent与分布式计算的结合是实现多Agent系统的关键。本文阐述了CORBA规范的主要结构及Agent系统的组织方式,分析了多Agent系统的结构、组织与通讯,讨论了CORBA规范提供的服务与多Agent系统的关系,提出一个基于CORBA的多Agent系统框架,简化了多Agent系统的开发,且有较好的开放性,为多Agent系统的实现提供了一种有效途径。     

流量伺服阀在液压系统仿真中的描述方法探讨

对电液流量伺服阀在液压伺服系统仿真分析中的建模描述方法进行了探讨,重点对基于流量伺服阀样本数据的描述方法进行了原理阐述。采用Simhydraulics软件搭建了物理测试模型并进行了建模验证,为建立高精度液压系统物理仿真模型奠定了基础。     

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.     

Theoretical Analysis for the Motion and Temperature of Melt Droplets in Spray Degassing Process

The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.     

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.     

An Easy Way to Quantify the Adhesion Energy of Nanostructured Cu/X(X=Cr,Ta,Mo,Nb,Zr) Multilayer Films Adherent to Polyimide Substrates

An approach based on film buckling under simple uniaxial tensile testing was utilized in this paper to quantitatively estimate the interfacial energy of the nanostructured multilayer films(NMFs) adherent to flexible substrates. The interfacial energies of polyimide-supported NMFs are determined to be *5.0 J/m2 for Cu/Cr, *4.1 J/m2 for Cu/Ta,*2.8 J/m2 for Cu/Mo, *1.1 J/m2 for Cu/Nb, and *1.2 J/m2 for Cu/Zr NMFs. Furthermore, a linear relationship between the adhesion energy and the interfacial shear strength is clearly demonstrated for the Cu-based NMFs, which is highly indicative of the applicability and reliability of the modified models.     

High-Speed Friction Stir Welding of SiC_p/Al–Mg–Si–Cu Composite

A 17 vol% SiCp/Al–Mg–Si–Cu composite plate with a thickness of 3 mm was successfully friction stir welded(FSWed) at a very high welding speed of 2000 mm/min for the first time. Microstructural observation indicated that the coarsening of the precipitates was greatly inhibited in the heat-affected zone of the FSW joint at high welding speed, due to the significantly reduced peak temperature and duration at high temperature. Therefore, prominent enhancement of the hardness was achieved at the lowest hardness zone of the FSW joint at this high welding speed, which was similar to that of the nugget zone. Furthermore, the ultimate tensile strength of the joint was as high as 369 MPa, which was much higher than that obtained at low welding speed of 100 mm/min(298 MPa). This study provides an effective method to weld aluminum matrix composite with superior quality and high welding efficiency.     

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。     

A STUDY OF TEMPERATURE-DEPENDENT VALENCE BOND STRUCTURE OF TITANIUM

On the basis of energy and shape method for the determination of the valence bond (VB) structures of crystal, the valence bond structure of titanium is redetermined at room temperature and calculated in the whole temperature range of 0-1943K. The outer shell electronic distribution of Ti is e_c~(2.9907) · (s_c~(0.4980) d_c~(2.4927)) ef1.0093 in crystal. The temperature dependences of the VB structures of hcp and bcc phases are the same. The VB structures of hcp and bcc phases monotonically increase or decrease with the increase in temperature, but show discontinuous changes at the phase-transformation temperature 1155K.