一种基于虚拟基准的太阳帆板平面度测量仪

本文针对太阳帆板平面度测量这一特定要求,开发出一种基于激光三角原理的特殊结构的光电非接触平面度测量系统。     

AHP在动态联盟企业的盟员选择中的应用

运用AHP方法对盟员选择进行了探讨 ,给出了分析方法 ,运用评分几何平均法、规范列平均法对评判矩阵进行了计算 ,有效地确定决策矢量。结合定做式人工关节的敏捷制造系统中加工中心选择的需要 ,给出了应用实例     

虚拟装配技术的研究

虚拟装配是虚拟制造的关键技术之一。通过分析虚拟装配设计环境的系统结构和信息流 ,提出了虚拟装配建模技术的解决方案 ,讨论了在实际应用虚拟装配技术时应考虑的问题。     

虚拟环境下制造资源的数字化模式表达与控制

虚拟制造是在数字化制造资源构成的虚拟环境中 ,在过程模型的驱动下 ,设备模型对产品模型进行的加工过程仿真。设备的数字化模型是构成虚拟环境的重要组成部分。本文提出了能够表达物理设备功能特性及其形状特性的虚拟设备模型 ;对设备几何进行了层次化、模块化分解 ,研究了虚拟控制器的描述与实现方法 ;利用面向对象方法实现了虚拟设备模型 ,该模型可以表达物理设备的基本功能     

建筑虚拟空间发展问题探讨

信息网络时代推动了建筑虚拟空间的产生和发展一该文从虚拟空间的定义、类型和发展现状等研究出发,论证了虚拟空间不断发展的必然性,得出建筑空间中虚、实两部分关系的发展趋势,以及两者结合的可行性方式。     

Lighting,colour and geometry: Which has the greatest influence on students' cognitive processes?

Many studies have analysed the effects that design elements, such as lighting and colour, have on students' cognitive functions. These analyses, while providing useful information, do not allow researchers to compare the effects of multiple design elements. The objective of the present study is to analyse the relative influence of lighting, colour and geometry on attention and memory, the main cognitive functions that underlie learning, and on preference. In a controlled, virtual reality (VR)-based experiment, 200 university students (100 male/100 female) performed attention, memory and preference tests in classrooms with different configurations of lighting (colour temperature and illuminance), colour (saturation and hue) and geometry (height and width). The results identified significant gender-based differences, which demonstrates the need to segment, by gender, samples in this type of study. Lighting had the greatest influence, significantly affecting males' memories, females' attention and the preferences of both genders. Colour was also an influential element, significantly affecting females' attention, while geometry was the least influential. Finally, it should be highlighted that attention was the metric most sensitive to design variations. These results may be of interest to architects, interior designers and engineers who wish to create classrooms that satisfy students’ psychological needs.     

A fast flow control algorithm for real-time emergency evacuation in large indoor areas

Evacuation in an emergency is always an important issue for shopping malls, subway stations and other populous indoor places. The purpose of evacuation is to evacuate people from the danger zone through exits within the shortest possible time. To help evacuation missions to be carried out efficiently and effectively by rescuers, a fast evacuation approach is needed.     

基于虚拟样机技术的液压液力复合转向机构的优化匹配研究

满足履带车辆在恶劣路面实现原地转向是转向系统设计的重要指标之一.目前,我国履带车辆普遍采用液压机械双功率流的无级转向系统,为满足大吨位车辆原地转向要求,必须匹配大排量的液压泵-马达或提高液压泵-马达的系统压力.为克服这些不足,提出液压液力复合转向工作机构.首先分析了液压液力复合转向机构的工作原理,确定了液力偶合器的原始特性.然后,以某车的综合传动系统为研究基础,通过引入液力偶合器构成液压液力复合转向机构,并在ADAMS/View环境中建立了相应的虚拟样机模型.以此模型为蓝本,确定了4个设计变量,通过分析,偶合器的有效直径和动力输入到液力偶合器泵轮的传动比为关键变量,并进行变量的敏度分析.最后,建立了优化约束条件和优化目标,利用ADAMS的DOE(Design of Experiment)功能进行了优化设计的仿真分析,确定了偶合器的有效直径和传动比,并进行了仿真实验.仿真表明,设计的液压液力复合转向机构可满足车辆在恶劣路面原地转向的要求,同时显著降低了液压泵-马达的排量,为低排量泵-马达实现大吨位车辆的转向性能提供了依据.     

虚拟界面的定义与描述

虚拟界面是建筑空间形式系统的一部分,是对该系统的补充,本文在完善空间界面分类的基础上,对虚拟界面作了定义,并通过阐明虚拟界面3种基本类型,详细描述了各种虚拟界面的构成特征,最后以此对密斯的巴塞罗那德国馆进行分析,验证了虚拟界面概念对解读空间的有效性。