基于MFC和UG/Open API的标准件库开发技术

分析了在UG环境下三维标准件建库的几种方法，介绍了一种将MFC和UG／Open API结合，用数据文件记录标准件参数的建库方法，并给出了建库设计思路和关键代码。     

基于UG的参数化零件模型库的创建

UG作为一种CAD/CAM/CAE软件,具有优越的复合建模功能。创建注塑模零件库,可以大大提供注塑模的设计效率,而参数化设计是注塑模零件建库的基础。文中运用UG强大的参数化造型技术,采用程序生成的方法建立了注塑模零件的模型库。     

在UG Ⅱ平台上建立零件图库的方法

在产品或工艺装备计算机辅助设计中涉及到大量通用件和标准件,若将这些通用件和标准件在CAD/CAM系统建立起零件图库供用户直接选用,可大大减少设计工作量,加速产品设计开发进程。 UGⅡ是机械类通用的CAD/CAM软件系统,虽不具备一些基本的零件图库,但却为用户提供了多种建库方法。总的说来,用户可通过UGⅡ的下列建库方法如电子表格法、表达式法、用户定义特征法、程序开发法等创建出满足使用要求的各种零件图库。     

UGII中标准件库的建立

介绍了UGⅡ中建立标准件的一般原则和UGⅡ(V16.0)中常用的建立标准件库的方法,对使用用户自定义特征、表达式、零件族和程序建立标准件库的方法进行了详细介绍,同时给出了这几种方法的适用场合和使用时的注意事项.     

UG二次开发中建库接口技术研究

介绍UG二次开发进行标准件建库的原理与方法 ,提出利用微软基本类库 (MFC)实现UG对话框界面与后台数据库通信的方法 ,给出标准件参数化库实现方案和接口程序示例。     

零件结构概念设计及其应用

在论述产品功能与结构对应性的基础上，给出了零件结构分解、单元建库的原理与方法，通过功能与结构之间的映射进行零件结构概念设计，实现了基于产品功能的结构设计自动化，最后通过实例说明了本文方法的应用。     

基于UG的螺纹连接件的参数化设计研究

介绍了参数化建模的基本思想,以CAD／CAM集成软件UG为平台,根据各种螺纹连接件的结构特点,提取出各自的基本参数,通过草图造型与特征造型相结合的方法,进行模板零件的建模：利用其强大的参数化功能和部件族功能,通过调用和编辑Excel电子表格,制作出了螺纹连接件的标准库。同时,很好地处理了在UG的应用中,螺纹联接件标准库的调用很难设置成详细螺纹显示的问题。通过标准件库的调用和装配试验,验证了该标准件库的正确性与实用性。     

UG在飞机零件加工中的应用

介绍了UG软件在飞机零件加工过程中的流程，并结合实际工作探讨了如何利用UG软件解决飞机零件理论外形建模的问题，总结了UG软件在飞机零件加工编程中高效应用和具体实现的方法。     

参数化建模和ADO技术在建立模具标准件库中的应用

针对在UG平台下如何快速创建标准件库的问题。提出了一种以VC＋＋6．0和SQ Lserver2000为开发工具，采用参数化建模技术、UG／OPENAPI技术以及ADO数据库链接技术，程序代码可重用性较高的建库方法。并结合实例详细说明建库步骤，给出了部分关键程序代码。     

UG平台下标准件库系统研究

提出基于组件的标准件库系统体系结构，研究并实现了面向部件建库的标准件库数据库系统设计，实现了标准件库系统管理组件，利用UG／Open工具实现了标准件调用和参数化生成接口组件。最后给出了UG平台下标准件库系统Inte3DLib／UG的运行实例。     

Calibrating the forward calorimeter of the CMS detector using a <Superscript>60</Superscript>Co radioactive source

Three methods for calibrating the forward calorimeter (HF) of the CMS detector using a ⁶⁰Co radioactive source with an activity of 5 mCi are discussed. These methods are shown to provide a calibration accuracy of ～5% with respect to the calibration on a 100-GeV electron beam.     

基于灵敏度的电磁结构形状优化方法研究

研究基于灵敏度的电磁结构形状优化设计方法。针对以往用磁位作为状态变量不方便的情况，文中直接采用磁通密度为状态变量。在用直接法求解矢量磁位灵敏度方程的基础上，给出适合形状优化的磁通密度灵敏度分析的两种方法——半解析法和局部差分法。前者在磁通密度灵敏度计算中对形函数导数采用了差分近似，后者用一阶近似方法得到设计变量扰动后的矢量磁位和磁通密度，然后用差分法计算磁通密度灵敏度。两种方法简单且计算效率高，精度能够满足要求。优化问题求解采用序列线性规划算法。应用本文方法对电磁铁和同步电机磁极进行形状优化，取得了满意的结果。     

Response sensitivity analysis of the dynamic milling process based on the numerical integration method

As one of the bases of gradient-based optimization algorithms, sensitivity analysis is usually required to calculate the derivatives of the system response with respect to the machining parameters. The most widely used approaches for sensitivity analysis are based on time-consuming numerical methods, such as finite difference methods. This paper presents a semi-analytical method for calculation of the sensitivity of the stability boundary in milling. After transforming the delay-differential equation with time-periodic coefficients governing the dynamic milling process into the integral form, the Floquet transition matrix is constructed by using the numerical integration method. Then, the analytical expressions of derivatives of the Floquet transition matrix with respect to the machining parameters are obtained. Thereafter, the classical analytical expression of the sensitivity of matrix eigenvalues is employed to calculate the sensitivity of the stability lobe diagram. The two-degree-of-freedom milling example illustrates the accuracy and efficiency of the proposed method. Compared with the existing methods, the unique merit of the proposed method is that it can be used for analytically computing the sensitivity of the stability boundary in milling, without employing any finite difference methods. Therefore, the high accuracy and high efficiency are both achieved. The proposed method can serve as an effective tool for machining parameter optimization and uncertainty analysis in high-speed milling.     

拉刀刃形自动测量的两种方法

拉刀刃形自动测量是实现拉刀重磨数控加工的关键。根据拉刀刃形的特点和数控重磨加工要求，提出了拉刀刃形自动测量的两种方法：测头偏置连续仿形测量法和分步分段测量法。分析和比较了这两种方法的优缺点，并提出了两种方法都必须采用的二维测头跟随控制算法。     

Subassembly identification for assembly sequence planning

Assembly sequence planning is a typical of NP-complete problem which will spend a large amount of computation time or disk memory once the assembly becomes complex. The complex product or assembly is composed of many parts and the number of assembly relationships between them is numerous. To decrease the difficulty of assembly sequence planning of complex products, the subassembly identification methods are focused on. It aims to decompose a complex assembly into a limitative number of subassemblies. Each subassembly contains a relatively smaller number of parts and the assembly sequence planning tasks of them can be handled efficiently. The subassembly identification methods for assembly sequence planning are summarized with respect to assembly constraints. The assembly constraints including the topological, geometrical, and process constraints are considered and merged into the assembly models for subassembly identification. The assembly models are generally represented as directed or undirected assembly diagrams including these considered constraints. It is generally taken as the input information to generate appropriate subassemblies complying with the requirements. The graph theories and graph search algorithms, integer programming methods and the emerging techniques, such as the knowledge-based methods, the intelligent algorithms and the virtual technology, etc. are advocated to resolve the subassembly identification problem with respect to the assembly models. The hierarchical assembly tree is widely used to represent the results of subassembly identification. These useful methods are not only used to subassembly identification for assembly sequence planning, but also successfully referred to by product disassembly.     

An appraisal of errors of orientation and sampling in the estimation of parameters of rough surfaces

The magnitude of errors caused by the sampling variability and by incorrect orientation of the stylus mechanism with respect to the reference plane of the specimen are evaluated for stylus methods of measuring the roughness of random surfaces.     

含角裂纹剪切型橡胶减振垫的断裂分析

通过非线性有限元方法对橡胶材料分别采用Neo-Hookean及Mooney两种本构模型的橡胶层含角裂纹的剪切型橡胶减振垫进行数值分析.分别给出减振垫切向刚度与撕裂能随不同裂纹尺寸的变化关系,并对两种模型的切向刚度以及撕裂能进行比较.对受剪切载荷作用的减振垫在含不同深度橡胶层斜角裂纹的情况进行了分析.给出含斜角裂纹减振垫的切向刚度和撕裂能随着相对裂纹深度的变化情况.分析了不同载荷以及不同裂纹尺寸的减振垫的撕裂能变化.     

工程陶瓷珩磨加工表面质量

孔类陶瓷零件在工业中正得到广泛的应用,珩磨技术是孔类陶瓷零件加工中的重要环节之一。从而陶瓷材料种类和珩磨工具两方面对陶瓷珩磨加工质量进行了研究,并从应用角度,分析了陶瓷材料的平顶珩磨表面。     

汽车行驶记录仪的设计与开发

介绍了以AT89S8252为核心的汽车行驶记录仪的主要功能及其软硬件设计,给出了信息的检测方法、系统框图和软件流程;针对其工作环境中电磁干扰强烈的实际情况,设计中采用了光耦隔离技术、看门狗等抗干扰技术,使系统的稳定性与可靠性得到了较大提高.     

Object-wave reconstruction by carbon film-based Zernike- and Hilbert-phase plate microscopy: a theoretical study not restricted to weak-phase objects

Transmission electron microscopy phase-contrast images taken by amorphous carbon film-based phase plates are affected by the scattering of electrons within the carbon film causing a modification of the image-wave function. Moreover, image artefacts are produced by non-centrosymmetric phase plate designs such as the Hilbert-phase plate. Various methods are presented to correct phase-contrast images with respect to the scattering of electrons and image artefacts induced by phase plates. The proposed techniques are not restricted to weak-phase objects and linear image formation. Phase-contrast images corrected by the presented methods correspond to those taken by an ideal centrosymmetric, matter-free phase plate and are suitable for object-wave reconstruction.