摘要：Modem product development becomes increasingly collaborative and integrated, which raises the need for effectively and efficiently sharing and re-using design knowledge in a distributed and collaborative environment. To address this need, a framework is developed in this research to support design knowledge representation, retrieval, reasoning and fusion, which takes account of structural, functional and behavioral data, various design attributes and knowledge reasoning cases. Specifically, a multi-level knowledge representation based on the Base Object Model （BOM） is proposed to enable knowledge sharing using Web services technologies. On this basis, a multi-level knowledge reuse method is developed to support the retrieval, matching and assembly of knowledge records. Due to the tree structure of BOM, both depth-first and breadth-first searching strategies are employed in the retrieval algorithm while a novel measure is proposed to evaluate similarity. Moreover, a method based on the D-S evidence theory is developed to enable knowledge fusion and thus support effective decision-making. The framework has been implemented and integrated into an HLA-based simulation platform on which the development of a missile simulation example is conducted. It is demonstrated in the case study that the proposed framework and methods are useful and effective for design knowledge representation and reuse.

摘要：二氧化碳(CO_(2))既是造成温室效应的主要气体,也是一种重要的C1资源,CO_(2)资源化利用是全球战略目标和研究热点,以CO_(2)与环氧化合物为原料合成环状碳酸酯是其高效高值化利用的主要途径。为解决以往催化剂体系存在的催化剂稳定性差、催化活性低、催化剂制备复杂等问题,本研究以高稳定性的氧膦化合物与过渡金属盐进行复配,通过调控过渡金属盐和氧膦化合物的比例,形成不同配比的二元复合催化体系,优选了最佳过渡金属盐和最佳比例(三丁基氧膦与溴化锌摩尔比为2:1,即[2Bu3PO-ZnBr2]),考察了催化剂用量、CO_(2)压力、反应时间、反应温度的影响,在最佳反应条件下(130℃,3 h,3 MPa),环氧丙烷(PO)的转化率可达92%。通过相关表征揭示了膦基复合催化体系与反应物之间的相互作用,提出了可能的催化机理。[2Bu3PO-ZnBr2]催化体系在循环使用5次后,依然能够保持高催化活性。本研究提出的膦基二元复合催化体系可为催化剂设计和CO_(2)利用提供思路。

摘要：Based on Fermi’s golden rule and the theory of Boltzmann collision term approximation, the hole scattering mechanism ofstrained Si/(111)Si1 xGexwas established, including ionized impurity, acoustic phonon, non-polar optical phonon and totalscattering rate models. It was found that the total scattering rate of the hole in strained Si/(111)Si1 xGexdecreased obviouslywith the increasing stress when energy was 0.04 eV. In comparison with one of the unstrained Si, the total hole scattering rateof strained Si/(111)Si1 xGexdecreased about 38% at most. The decreasing hole scattering rate enhanced the hole mobility instrained Si materials. The result could provide valuable references to the research on hole mobility of strained Si materials andthe design of PMOS devices.

摘要：将矩阵方法应用到复杂产品的多领域协同设计中,在分析多领域协同设计耦合关系的基础上,用设计结构矩阵来描述多领域协同设计的工作流程,并通过设计结构矩阵的初始化和重构方法来解决多领域协同设计中的耦合问题,以缩短产品设计周期,降低开发成本。

摘要：分析了并行产品开发的特点，提出了并行产品开发的信息集成框架，并从８６３／ＣＩＭＳ关键技术攻关项目“并行工程”的需求出发，参照ＳＴＥＰ应用协议ＡＰ２１４，建立了并行工程产品特征信息主模型，同时利用ＳＴＥＰ开发工具，通过对ＣＡＤ特征再建模的方法支持ＣＡＤ与ＤＦＭ／ＣＡＰＰ／ＣＡＭ／ＣＡＦＤ的信息集成；利用Ｄｅｌｔａ文件管理工具实现产品数据设计版本管理。

摘要：提出了虚拟特征单元和虚拟分区的原理和方法， 虚拟特征单元和虚拟分区的关系影射了特征单元之间的关系， 利用虚拟特征单元和虚拟分区实现了智能化的产品设计。

摘要：在复杂产品研发设计过程中,不同设计阶段有不同的设计目标,并依据仿真目标有不同类型的仿真任务,需要不同分辨率的复杂产品仿真模型参与仿真。针对多分辨率特性对模型与接口进行定义,在此基础上研究模型分辨率的控制机制,对系统结构状态和模型分辨率状态分别建立描述机制,提出系统分辨率的控制机制,梳理出一种跨层次切换技术。经过实验验证,该方法可有效解决模型分辨率切换问题,在保证仿真精度的同时,提升仿真效率,节省所需的仿真资源。该方法结构简单,有望在未来进一步推广使用。

摘要：在对虚拟样机环境下复杂产品协同设计主要内容进行概述的基础上,针对多领域协同设计问题,采用广义约束网络方法建立参数协调模型,并抽象出各个领域之间的耦合关系模型,根据全局灵敏度方程GSE(GlobalSensitivityEquations),对其进行分析提出相关策略,减少产品的设计迭代和返工次数。

摘要：ＶＤＭＯＳ的开关时间对其开关功耗和频率特性有直接影响．笔者设计和制造了３种体内结构与常规ＶＤＭＯＳ相同，而表面结构不同的器件．实验结果表明，这３种结构器件的开关时间都明显减小．

摘要：Along with the explosive increase of product data management systems (PDMs),integrating polymorphic PDMs is becoming one of the focuses in the field. Aner brief describing several features of PDM, and market requirements and required performance for integrating the polymorphic PDMs, the paper specializes in discussing some key technologies involved in virtual enterprise oriented integrated development. Some implementing strategies and procedures are proposed.