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.     

硝化棉虚拟生产操作培训系统的开发

硝化棉生产虚拟操作培训系统,包括理论知识和实物模型、事故场景和数据库、虚拟操作及操作考核测试模块等.实物模型和事故场景用3DS MAX制作.数据库采用VB和Access实现.操作考核成绩评定使用CENTUM顺控表的工作单组态方法.该系统培训内容含:全流程、工序及工况培训.     

基于Lab Windows/CVI的GPIB虚拟仪器的设计

利用Lab windows/CVI的GPIB虚拟仪器远程控制系统,由FSP频谱分析仪、信号发生器、功率放大器等仪器组成,并通过GPIB总线与主控计算机相连.主控计算机内安装IEEE488标准接口卡,通过软件可对各测控设备实现远控和自动或半自动操作,同时对重要数据进行分析和储存.     

LabVIEW在中压电力线信道噪声发生器设计中的应用

为了方便在实验室测试与调试中压电力线调制与编码硬件电路,本文设计了一种基于虚拟仪器技术的中压电力线信道噪声发生器。主要利用LabVIEW编程,在计算机内产生噪声数据,通过虚拟仪器采集卡输出噪声。该噪声发生器以软件设计为主,解决了传统的仪器设计开发时间长、成本高的主要问题。并可以输出符合中压电力线信道噪声特性的几类主要噪声,方便了在实验室测试调制与编码硬件电路的性能。     

Geometric error measurement of spiral bevel gears using a virtual gear model for STEP-NC

Geometric error measurement is required to evaluate the grade of the manufactured gears. Due to the complexity of the spiral bevel gear, direct measurement with the physical part has been conducted in a very limited way. In this paper, we present an indirect measurement based on the virtual gears model (VGM), obtained by NUBS fitting of the surface points measured by CMM (coordinate measuring machine). By comparing the VGM with CAD model (soft-master model), various errors such as tooth profile error and tooth trace error can be automatically measured. The developed method is simple and robust without requiring a special measuring device, and hence it can be applied for the industrial practice as a means for measuring the tooth profile and tooth trace errors which cannot be measured by the conventional method. Further, the model-based method can be incorporated on the advanced CNC controller based on the new CAM–CNC interface scheme of STEP-NC [STEP (standard for transfer and exchange of product model data) based data model for CAM and CNC interface] as an on-line inspection module. Algorithmic details together with experimental validation results are given.     

Computer simulation applied to an orthogonal three-rod machine tool for machining a complicated three-dimensional surface

A computer simulation approach to machine a complicated three-dimensional surface by using a virtual orthogonal three-rod machine tool is presented. First, based on a Hunt’s parallel mechanism of three degrees of freedom, a three-dimensional virtual orthogonal three-rod machine tool with three degrees of freedom is created with advanced C software. Secondly, a tool spiral path base on the three-dimensional surface of workpiece is constituted. Thirdly, the tool spiral path base of the three-dimensional surface is assembled into a virtual orthogonal three-rod machine tool with some auxiliary links and a new virtual one-degree of freedom mechanism is created. Finally, by analyzing reversing motion, a reasonable input rotation function is determined, and the kinematic curves of the three rods and the feeding process are simulated and analyzed.     

"虚电路-虚拟数字机"系统设计与开发

文章介绍了自主研究设计的“虚电路-虚拟数字机”系统思想、系统模型、系统结构、技术特点，以及基于“虚电路-虚拟数字机”的数字电路虚拟实验系统应用实例。     

灵敏度分析在压缩机零部件设计中的应用

在设计冰箱压缩机零部件的过程中,往往需要考虑几何参数、材料性能和边界条件等在适当范围内变化时对其性能(应力、变形等)的影响。"虚拟实验",又称试验设计,正是研究此类灵敏度问题的一种系统方法。它使用有限元工具,产生设计矩阵,对各参数组合下的零件性能进行仿真,从而获得各参数的影响情况,确定主要参数,将其作为优化变量。本文以压缩机中的内排管为例,对几何参数的灵敏度进行了分析。     

基于虚拟传感器的气体传感器故障诊断与恢复

对传感器进行故障检测与恢复,对提高系统可靠性是必须的。采用智能软方法可以有效地降低系统的成本。由于化学气体传感器之间具有信息冗余的特点,该文提出了利用神经网络构建虚拟传感器来实现化学气体传感器故障检测与恢复的新方法,该方法已用于一个人工嗅觉系统中,实验表明采用该方法可以方便地实现传感器故障的在线诊断与恢复。     

基于虚拟仪器的机车辅保插件综合测试台

基于虚拟仪器和LabVIEW技术的机车辅保插件综合测试台由虚拟仪器、多功能信号采集卡、I/O模数输出卡、信号调整电路、系统调压电路及通道选择单元构成.操作员通过虚拟仪器发出指令,执行后转换为数据信号输出给I/O卡并完成数模转换.输出的模拟信号经电压调整后通过继电器矩阵完成相应的通道选择,作为被测试设备的输入信号.经过软件处理后,将检测过程与结果储存并通过网络设备实现在局域网中的资源共享.