基于弹性分析的复杂产品系统研发管理机制研究

在复杂产品系统的早期设计阶段,研发质量和研发成本问题一直是人们关注的问题。通过研究系统的弹性、可靠性和恢复力之间的关系,构建基于弹性理论的复杂产品系统关键组件的分级管理框架,为不同层级的关键组件制定出相应的研发管理措施,并通过对不同弹性分级管理机制作用下系统性能的恢复时间、恢复水平和恢复状态的管理来改善复杂产品的研发设计,使得复杂产品在达到系统安全要求的情况下,最大限度地降低研发成本,提高研发质量。     

Accuracy of human motion capture systems for sport applications; state-of-the-art review

Objective: Sport research often requires human motion capture of an athlete. It can, however, be labour-intensive and difficult to select the right system, while manufacturers report on specifications which are determined in set-ups that largely differ from sport research in terms of volume, environment and motion. The aim of this review is to assist researchers in the selection of a suitable motion capture system for their experimental set-up for sport applications. An open online platform is initiated, to support (sport)researchers in the selection of a system and to enable them to contribute and update the overview. Design: systematic review; Method: Electronic searches in Scopus, Web of Science and Google Scholar were performed, and the reference lists of the screened articles were scrutinised to determine human motion capture systems used in academically published studies on sport analysis. Results: An overview of 17 human motion capture systems is provided, reporting the general specifications given by the manufacturer (weight and size of the sensors, maximum capture volume, environmental feasibilities), and calibration specifications as determined in peer-reviewed studies. The accuracy of each system is plotted against the measurement range. Conclusion: The overview and chart can assist researchers in the selection of a suitable measurement system. To increase the robustness of the database and to keep up with technological developments, we encourage researchers to perform an accuracy test prior to their experiment and to add to the chart and the system overview (online, open access).     

基于虚拟现实技术的牛顿环实验设计

以大学物理中的牛顿环实验为例,开发了以3DS max、Cult3D、JavaScript和Flash为核心设计技术的大学物理虚拟实验,弥补了传统实验中的缺陷.介绍了虚拟牛顿环实验的开发流程、实现内容及操作方法等,对大学物理实验内容和虚拟技术之间的有效交融进行了研究.通过与传统实验结果的对比,彰显了虚拟技术在现实中应用的优越性.     

Cool 3D在PowerPoint2003中的应用

通过在PowerPoint2003中插入C0013D三维文字和动画,可以使PowerPoint课件更具有吸引力,克服了PowerPoint动画制作的局限性。     

美国传播学的“冷战宣言”——重评拉斯韦尔的《社会传播的结构与功能》

拉斯韦尔的《社会传播的结构与功能》是传播学史上的一篇经典之作,对这一学科的形成与发展产生了深远影响。本文结合拉斯韦尔的政治理论和思想背景,揭示了他对两种意识形态对立以及由此引发战争可能性的强调,认为该文堪称美国传播学的冷战宣言。     

一篇存在争议的传播学奠基文献

本文以拉斯韦尔的研究传统缺乏传承为切入点,重新解读了拉斯韦尔60年前发表的《社会传播的结构与功能》一文。提出目前传播学界以拉斯韦尔模式代替拉斯韦尔的传播观念,忽略了拉斯韦尔传播观念中丰富的内涵,建议要在完整的学术语境中理解它的内容。在讨论拉斯韦尔研究传统缺乏传承的问题时,本文认为其主要原因是过于追求对策研究,忽视了理论研究自身的规律,没有提出真正具有吸力力和理论价值的问题。     

基于Pro—E／ADAMS的路面铣刨机集料输送机构的三维建模与仿真分析

路面铣刨机是一种高效的沥青混凝土路面维修养护机械,其原理是利用滚动铣削的方法把路面局部或全部破碎。为了减轻劳动强度,机器设计有回收装置,使铣削下来的铣削物直接输送到运载卡车上。本文运用Pro—E和ADAMS软件对其集料输送机构二级皮带支撑机构进行三维建模和仿真分析。     

基于Papervision3D的在线产品展示技术研究

分析当前在线三维产品展示技术的特点,提出基于Papervision3D的在线产品展示方法,并对其关键技术--建模技术、在线渲染技术和实时交互技术等--进行分析与探讨.最后,通过一个应用实例说明该技术的有效性.     

Law of surface movement for multi-coal seam strip mining

It is an important part of green mining to control the disasters of coal mining which have caused irreversible damages to buildings and ecological environment. Strip mining is one of the efficient measures to control surface subsidence and mining damage. However, the research on the laws of the surface subsidence are still deficient in multi-coal seam strip mining at present. Based on the Fast Lagrangian Analysis of Continua （short for FLAC3D） numerical simulation software, the laws of the surface subsidence and horizontal movement were systematically studied for different depths, different mining widths, different distances between seams, different mining thickness, different parameters between seams and the special relations of the upper pillar and the lower pillar in the vertical direction in multi-seam strip mining. The function relation between the maximum subsidence and the maximum horizontal movement with the depth, the mining width, the seam distance, mining thickness, different parameters between seams and the partial offset are summarized respectively. Finally the formula integrating the surface maximum subsidence value and the maximum horizontal movement was deduced. The results can be used for reference theory and measure in forecasting the surface displacement in multi-coal seam strip mining.     

On the integration of model-based feature information in Product Lifecycle Management systems

As CAD models continue to become more critical information sources in the product’s lifecycle, it is necessary to develop efficient mechanisms to store, retrieve, and manage larger volumes of increasingly complex data. Because of their unique characteristics, 3D annotations can be used to embed design and manufacturing information directly into a CAD model, which makes models effective vehicles to describe aspects of the geometry or provide additional information that can be connected to a particular geometric element. However, access to this information is often limited, difficult, and even unavailable to external applications. As model complexity and volume of information continue to increase, new and more powerful methods to interrogate these annotations are needed.In this paper, we demonstrate how 3D annotations can be effectively structured and integrated into a Product Lifecycle Management (PLM) system to provide a cohesive view of product-related information in a design environment. We present a strategy to organize and manage annotation information which is stored internally in a CAD model, and make it fully available through the PLM. Our method involves a dual representation of 3D annotations with enhanced data structures that provides shared and easy access to the information. We describe the architecture of a system which includes a software component for the CAD environment and a module that integrates with the PLM server. We validate our approach through a software prototype that uses a parametric modeling application and two commercial PLM packages with distinct data models.