基于PLM的工程资源管理系统研究与实现

针对PLM／PDM系统实施中存在的问题以及目前资源管理系统的不足，提出了基于PLM的工程资源管理方法。给出了C／S多层分布式软件体系结构、数据元模型的动态定制方法以及基于元模型的系统集成方案。最后通过系统在北京清软英泰信息技术有限公司的PLM系统中的应用，证明了方案的可行性。     

Interesterification of tallow and sunflower oil

The objective of this study was to manufacture a shortening using chemical interesterification (IT) of tallow-sunflower oil blends to replace fish oil in the present formulation, which is now in short supply in Chile. The significant variables of the IT process were obtained by 2⁴⁻¹ fractional factorial design. The proportion of tallow (T) in the blend, catalyst concentration, and reaction temperature had a significant effect on the melting point (mp) (P≤0.05). IT of tallow and sunflower oil blends (90∶10 and 70∶30) diminished the mp, dropping point, and refractive index compared to tallow. However, a noninteresterified 90∶10 blend mp was not significantly different from tallow. IT produced a solid fat content (SFC) profile of IT90∶10 blend that was appropriate for use in shortenings for the baking industry. Blending and IT of the 90∶10 blend increased the melting profile of the tallow and the melting range from −40 to 60°C while the endotherms of the middle-melting triacylglycerols (TAG) decreased. The IT90∶10 blend hardnesswas 70% lower than tallow hardness, and the crystal network was composed of large spherulites in a network. IT resulted in an appropriate method to improve physical properties of tallow, whereas blending did not significantly modify it. The interesterification changed the SFC profile of IT90∶10, giving a more appropriate shortening for use in the baking industry.     

基于一维分段非线性Markov映射的混沌滚动密钥产生器

用拓扑共轭映射对一维分段线性映射进行非线性化处理,所构成的复合迭代混沌系统及其不变分布具有偶对称特性,最终生成的二值混沌序列具有理想的密码学特性。     

可编程控制器在挤管机控制系统中的应用

本文论述了挤管机工艺流程及现状,论述了ＰＬＣ及ＰＣ在挤管机控制系统中的应用。着重介绍了几个实际问题的解决及ＰＬＣ与ＰＣ之间的通讯问题。     

利用PLM技术促进现代模具企业精益化规模化发展

通过阐述制造业信息化的基本理论,以及模具企业的订单式生产的特点,介绍了信息化在模具企业中的应用,并以一汽铸造模具厂为例介绍了CAXA设计工艺制造一体化PLM系统的信息化应用方案,并对其应用效果进行了评价,指出了模具企业信息化规划和实现需要注意的一些问题,对于该类企业的信息化过程具有重要的借鉴作用。     

Proposition of a PLM tool to support textile design: A case study applied to the definition of the early stages of design requirements

The current climate of economic competition forces businesses to adapt more than ever to the expectations of their customers. Faced with new challenges, practices in textile design have evolved in order to be able to manage projects in new work environments. After presenting a state of the art overview of collaborative tools used in product design and making functional comparison between PLM solutions, our paper proposes a case study for the development and testing of a collaborative platform in the textile industry, focusing on the definition of early stages of design needs. The scientific contributions presented in this paper are a state of the art of current PLM solutions and their application in the field of textile design; and a case study where we will present, define, and test the mock-up of a collaborative tool to assist the early stages, based on identified intermediary representations.     

基于本体的单一产品数据源组织研究

为了满足产品生命周期管理对产品信息共享和交互的需求,合理组织作为底层数据支撑核心的单一产品数据源显得尤为重要.提出了一种基于本体论的组织框架,该框架采用分层思想,将数据源分为本体层和数据层,不仅满足语义层的信息查询,还易于数据源的扩充;阐述了组织框架的具体实现方法,在分析单一产品数据源内容基础上,建立了面向产品生命周期管理的全局本体,通过数据源和本体之间的映射提取面向数据源的应用本体,并通过本体之问的映射实现本体语义一致性,从而保证了单一产品数据源的一致性、完备性和共享性.     

PLM系统在装备设计制造中的应用

本文阐述了PLM系统的先进管理理念,分析了中色科技在装备设计、制造中面临的挑战,结合实际情况,提出了如何选择PLM系统供应商、如何实施,以及实施中遇到的问题和解决方案.PLM系统的实施将保证中色科技产品数据的安全性以及知识管理的全面性和有效性,增强企业响应市场需求的快速反应能力,缩短产品研制周期,在降低研制成本的同时进...     

NX软件在正铲液压挖掘机设计中的应用

基于NX设计软件液压挖掘机设计,利用NX软件的WAVE功能建立液压挖掘机整机参数化模型;利用NASTRAN的分析功能对机构进行分析,使用WAVE参数化功能快速优化机构的模型;利用NX的间隙分析功能审查模型;利用NX的制图功能绘制施工图纸,从而为物理样机的设计制造提供了可靠的基础。     

PLM系统中的数据安全技术分析

如何保障PLM系统的安全性是一个重要课题,不仅需要PLM系统内部保证机制,更需要加密软件保护、硬件保证、制度保证等其他方面的保障,才能解决文档管理可能存在的漏洞,确保PLM图文档安全可靠地上线运行,为企业的数据管理提供全方位保护。文章通过文档防泄露系统和PLM系统的无缝整合,构建基于PLM系统的信息安全体系。