应对21世纪制造业进程的我校机械学科发展策略

21世纪制造技术的发展趋势将随着市场的全球化、竞争的激烈化、需求的个性化、生产的人性化而呈现出信息化、高技术化和服务化.描述了构成21世纪制造业发展前景的技术变革及其特点,并指出了为了应对这场技术变革,我校机械学科应采取的发展策略.     

基于制造特性的微小型钟表机构有限元仿真

研究钟表机构微小型零件齿轮的齿向误差和位置误差对整个机构的影响.将有限元法和正交试验法相结合研究两种误差对整个机构耦合关系的影响;分别探求了齿向误差、位置误差极限,建立微小型无返回力矩钟表机构的有限元力学模型,并对钟表机构影响最大的位置误差和齿向误差组合进行有限元分析,验证所确定的误差极限值的合理性.该研究结果可为微小型钟表机构的设计、加工、检测、装配提供参考依据.     

大型板带轧机机架制造工艺研究

为实现大型轧机制造的国产化和降低轧机设备投资,结合马钢2 250 mm热轧机和2 130 mm冷轧机薄板生产线的特点和需要,对大型板带轧机机架的制造工艺进行了研究.经预装配测试,轧机机架的制造精度完全达标,各项性能指标完全符合设计的技术质量要求.2 250 mm热轧薄板和2 130 mm冷轧机薄生产线的工业试验结果表明:在确保轧机机架质量的前提下,降低了设备投资,缩短了制作时间.     

依据零件三维检测数据的机械加工误差诊断

首先简要介绍了在机械加工领域误差诊断的国内外基本研究现状，然后针对目前该领域内对小批量生产多工序加工误差诊断研究的不足，在对零件三维检测数据分析与信息挖掘的基础上，针对多工序加工内容，提出了一种对多工序加工误差的诊断方法，并开发出一个原型系统一—基于检测数据及经验规则的多工序加工误差诊断系统，在此基础上利用空间位置分析法得到加工误差的位置和方向，最后用典型零件给出实例证实了该方法的可行性。     

Modeling and Analysis of Capacitated Transfer Lines with Unreliable Machines and Deterministic Procesing Times

ＭｏｄｅｌｉｎｇａｎｄＡｎａｌｙｓｉｓｏｆＣａｐａｃｉｔａｔｅｄＴｒａｎｓｆｅｒＬｉｎｅｓｗｉｔｈＵｎｒｅｌｉａｂｌｅＭａｃｈｉｎｅｓａｎｄＤｅｔｅｒｍｉｎｉｓｔｉｃＰｒｏｃｅｓｉｎｇＴｉｍｅｓＳＨＵＳｏｎｇｇｕｉＪＩＡＮＧＣｈａｎｇｊｕｎＩｎｓｔ...     

The U/Θ effect of electricity parameters of the lotus root silk in the liquor with different pH values

The silk of lotus root is a kind of natural biomaterial with the advantages of easy absorbing and dissolving and poisonless. It may become a new engineering material for clinic and tissue engineering. However, the relationship between its electricity parameters and the pH values of the liquor that the silk is dipped in is unknown presently. The electricity parameters of inductance, capacitance and impedance of the silk were measured in the environment with the temperature ranging from 23℃ to 25℃ and the humidity ranging from 45% to 55% when it was dipped in the liquor with different pH values for 24 h. The results show that the inductance and impedance vary in U shape curves with the liquor pH value, and the capacitance varies in Ω shape curve. The minimal value of the U curves and the maximal value of the Ω curve appear at the point where the pH value equals to 7. The phenomena are called the U/Ω effect. It means that the silk has perfect biocompatibility with human tissues. The study results may imply that the silk have broader potential applications in biomedicine, tissue engineering and bioelectronics.     

A preliminary study of nest structure and composition of the weaver ant Polyrhachis (Cyrtomyrma) delecta (Hymenoptera: Formicidae)

Polyrhachis weaver ants build their nests from vegetation bound together using silk produced by their larvae. Here we provide a pilot study of the composition and the physical structure of three arboreal silk nests of Polyrhachis (Cyrtomyrma) delecta based on examination of three colonies. We found broadly similar nest architecture and size of the nests with each containing six or seven identifiable chambers, and describe the distribution of ants of different castes and life stages between them. We also note the construction of silk ‘girder’ structures, which spanned larger chambers, and we hypothesize that these provide additional strength to the internal nest structure. This study highlights the importance of more detailed investigation of the internal nest structure and composition in Polyrhachis, and other weaver ant species, which will help to develop our understanding of this specialized form of nest construction and nesting habits in a diverse group of ants.     

The evolution of prey‐wrapping behaviour in spiders

We traced the evolution of silk use by spiders in attacks on prey by combining previous publications with new observations of 31 species in 16 families. Two new prey‐wrapping techniques are described. One, in which the spider holds a tense line (often covered with viscid silk) with both legs IV and applies it to the prey with a simultaneous movement of both legs, may be a synapomorphy linking Theridiidae, Nesticidae, and Synotaxidae. The other, in which the spider stands over the prey and turns in place, is apparently very ancient; it occurs in Theraphosidae, Tengellidae, and Agelenidae. The use of legs IV to wrap prey is described for the first time in Filistatidae and Scytodidae. Using a recent phylogeny of spiders, we propose that prey wrapping with legs IV has evolved convergently at least four times. We propose that prey wrapping originally evolved from egg‐sac construction behaviour.     

集成制造物流网络的建模与绩效分析

提出了一种能够用来建模不同网络拓扑（如串联、并联、装配及树状结构）的制造物流链的解析集成框架.整个物流网络中的各个节点可以采用不同的库存策略.绩效评价指标,如每个节点的订单履行率、最终客户的服务水平和网络中的库存成本用排队论和生产授权卡控制机制分析.该解析框架可以作为一个将企业的功能分解为详细的子过程及活动的统一基础,因而是一个集成的框架.通过该框架,生产制造活动和物流活动能够实现逻辑上的集成,从而为制造物流网络的设计、分析和优化提供有效的途径及工具.     

适用于网络化制造模式的数控系统的研究

在综合分析网络化制造模式对计算机数控系统功能需求的基础上,从框架体系结构和技术体系结构等不同的方面详细地研究了满足网络化制造要求的数控系统－－WEB＿CNC系统的体系结构,同时对建立这一体系结构所涉及的基于EWB的浏览器／服务器处理技术、DCOM／CORBA技术、ASP／ADO技术、XML技术等网络支撑技术进行了研究,在此基础上,研究了EWB＿CNC系统的实现方法、包括采用基于Browser/Server结构实现数控系统远程服务和信息共享功能,满足系统的非实时性要求;采用基于DCOM／CORBA分布组件技术实现数控系统的远程监控功能,满足系统的实时性要求,最后建立了满足网络化制造要求的WEB＿CNC系统的功能模型,为WEB＿CNC系统的实现奠定了基础。