基于台达数控系统斗笠式刀库控制的研究

斗笠刀库结构简单、成本低,其应用十分广泛。介绍了斗笠刀库控制系统的设计。该斗笠刀库驱动系统以通用接口形式与数控系统连接,实现刀库与不同数控系统配套使用,实现了刀库的高效率多功能操作。     

镜像铣削系统的蒙皮零件在机测量技术研究

以镜像铣削系统为研究对象,为了获取蒙皮零件装夹在镜像铣削系统的点位坐标,搭建了镜像铣削系统的在机测量硬件平台,并以镜像铣削系统的数控系统为基础,开发了数控系统嵌入式测量软件人机界面,实现飞机蒙皮复杂自由曲面的加工-测量一体化制造。采用蒙皮零件在机测量的制造方式减少了重复装夹定位的时间消耗和误差引入,提高了蒙皮零件自由曲面的加工精度和检测效率。在镜像铣削系统上开展关于蒙皮零件的在机测量系统的设计具有较高的工程应用价值。     

Effects of thermodynamics parameters on mass transfer of volatile pollutants at air-water interface

A transient three-dimensional coupling model based on the compressible volume of fluid(VOF) method was developed to simulate the transport of volatile pollutants at the air-water interface. VOF is a numerical technique for locating and tracking the free surface of water flow.The relationships between Henry's constant, thermodynamics parameters, and the enlarged topological index were proposed for nonstandard conditions. A series of experiments and numerical simulations were performed to study the transport of benzene and carbinol. The simulation results agreed with the experimental results. Temperature had no effect on mass transfer of pollutants with low transfer free energy and high Henry's constant. The temporal and spatial distribution of pollutants with high transfer free energy and low Henry's constant was affected by temperature. The total enthalpy and total transfer free energy increased significantly with temperature, with significant fluctuations at low temperatures. The total enthalpy and total transfer free energy increased steadily without fluctuation at high temperatures.     

Iterative structure retrieval techniques in HREM: a comparative study and a modular program package

A retrieval technique for crystal structures using high-resolution electron microscopy is presented. The inversion of the complex structure-to-image relation is performed by numerical optimization of the configuration space of object models. Unlike structure refinement in X-ray crystallography, the method operates on unknown defect structures on a nanometre scale. The diversity of crystal defects examined and the differences in microscope types and alignment conditions makes it necessary to adapt the basic algorithm to a broad variety of needs resulting in a modular program package for general use. New developments, such as a real space slice function calculation, problem adapted optimization strategies, and finally an examination of iterative matching of image series and exit wavefunctions are presented.     

INTERFACE DEFORMATION CHARACTERISTICS OF BIMETAL FORMING

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VOD系统中一种机顶盒的解决方案

提出了一种 VOD系统中机顶盒的解决方案 ,包括硬件和软件结构 .硬件包括网络接口 NIU和机顶单元 STU,NIU为一特定的 ATM接口 ,STU为一通用的与网络无关的硬件平台 .在软件结构中 ,详细描述了系统网络协议和 DAVID系统软件 .     

基于人性化网站界面设计的用户建模

为了能够实现网站界面风格的人性化和和谐化,通过对部分用户的调查来研究用户因素和网页界面因素之间的相互关系,并从错综复杂的用户和网页界面因素中提取起决定性作用的因素.基于这些决定性因素,用神经网络的方法建立了一个用于个性化网站界面风格和布局设计的用户模型.利用所建立的模型设计了一个针对老年人的网页界面,经过测试验证,此模型能收到良好的效果,提高了用户对网站界面风格和布局的整体满意度.     

Difference in subsurface damage in indented specimens with and without bonding layer

This paper aims to assess the applicability of the bonded–interface technique (BIT) that has been used for examining sub-surface damage in brittle materials. With the aid of the finite element method, the indentation stress fields in alumina specimens with and without a bonded–interface were analysed. It was found that the bonded–interface greatly alters the stress distribution in the neighbourhood of the interface. The high-stress zone shifts away from the interface, and extends to the surface. Both glue layer mechanical properties and bond thickness play a limited role in the overall stress field of the BIT alumina. Comparisons of theoretical predictions with experimental observations showed that, to a great extent, the BIT presents a different pattern of sub-surface damage. The study clarifies the applicability of the BIT and offers a useful guideline for practitioners.     

An interpretation of the failure paths of roughened metal/polymerinterfaces

Roughening of metal surfaces enhances the adhesion strength of metal to polymer by mechanical interlocking and this often produces cohesive failure. In a previous work [1], an adhesion study on a roughened metalpolymer system was carried out, and the correlation between adhesion strength and failure path was investigated. In the present work, the correlation between failure path and microstructure of metal surfaces before molding was studied. The results showed that the variation in failure path could be explained by introducing a simple adhesion model developed from the theory of the fiber reinforcement of composite materials. It is believed that this model can be extended to other similarly roughened metal-polymer systems.