多通道压力数据采集与分析系统设计

为低成本实现多通道压力数据采集与分析,借助虚拟仪器技术、计算机技术、通信技术等,成功地构建了以虚拟仪器为核心的多通道压力数据采集与分析系统.该系统采用C8051F040混合单片机进行数据采集,利用RS232总线结构进行数据传输,利用PC机和Lab Windows/CVI软件进行数据处理和分析.实验结果证明:该数据采集系统结构简单,操作方便,准确性、可靠性高,测试数据符合设计要求,具有很高的实用价值.     

一种石油远程测控系统的研究

为低成本实现石油流量的远程测控,借助虚拟仪器技术、计算机技术、通信技术等,设计了以虚拟仪器为核心的远程石油流量测控系统方案。该系统中,通过At90can128单片机进行数据采集,通过can总线进行数据传输,利用PC机和Lab Windows/CVI软件进行数据处理和分析,同时向执行机构发送指令,使其作出相应的动作。该测控系统结构简单,操作方便,准确性、可靠性高,具有很高的实用价值,将为石油工业安全生产提供有力保障。     

直升机液压泵的CAT系统研究

根据直升机液压附件维护要求,采用计算机辅助测试和虚拟仪器技术,构建并开发基于LabWindows/CVI环境的直升机液压泵测试系统。利用该CAT系统解决了柱塞泵回油流量的自动测试问题以及吸油压力、油温控制、油液清洗等问题,系统操作简便、稳定可靠。     

基于LabWindows/CVI的喷气织机引纬气流测试系统

根据引纬流场测试特点,基于虚拟仪器软件开发平台Lab Windows/CVI,使用L型总压探针、CYG101型固态压阻压力传感器和PCI-1232多功能数据采集卡,开发用于喷气织机的引纬气流动态测试系统,实现对织造过程中主喷嘴气流、辅助喷嘴气流和引纬汇交气流的动态压力的实时检测,并能按要求对采集的数据进行分析与处理。应用该测试系统,对主喷嘴气压、辅助喷嘴气压和汇交气流气压进行测试,并对测试结果进行分析。     

基于Lab Windows/CVI的无刷直流电动机转速控制仿真系统研究

基于Lab Windows/CVI强大的图像设计与处理功能,设计了电网波动对无刷直流电动机转速控制的影响的仿真系统,并采用扩充临界比例法进行整定的数字PID控制来减小这种影响.实践表明,该系统能有效地仿真电网波动对无刷直流电动机转速控制的影响,并可用于电网参数的计算.     

基于声卡和虚拟仪器技术的齿轮故障诊断系统

针对传统齿轮故障诊断系统所需仪器繁杂、数据采集卡成本高的难题,提出了一种基于计算机声卡和虚拟仪器技术构建齿轮故障诊断系统的方案,该系统利用声卡的DSP技术采集数据和LabVIEW的多线程编程技术实现了各种信号分析功能。     

基于Zigbee技术的流量计量监控系统的设计与实现

将Zigbee无线通信网络应用于流量计量监控系统,给出承载Zigbee协议系统级芯片CC2430的硬件和软件设计;监控中心管理系统采用Lab Windows CVI编写,实现对远程数据的实时采集、显示、存储和分析等功能.实践证明,该系统抗干扰性强、安全可靠、运行稳定.     

基于LabWindows/CVI的液压冲击台检测与控制

本文以液压式冲击台的工作原理和工作过程为背景，介绍了基于Lab Windows／CVI的冲击台监测与控制系统的总体方案及软硬件实现。     

虚拟仪器技术在液压测试系统中的应用

虚拟仪器就是在通用计算机上加上一组软件和/或硬件，使得使用者在操作这台计算机时，就象是在操作一台他自己设计的专用的传统电子仪器，其核心是计算机大量丰富的软硬件资源的充分利用，作者经深刻理解虚拟仪器技术的核心及思想方法，并结合多年来对计算机辅助液压测试系统的研究和开发，将虚拟仪器技术应用于液压测试系统,在Windows9X环境下，以VisualC 6.0为开发工具，开发出基于虚拟仪器技术的液压测试系统，并在现场实际中使用得到满意的效果。     

虚拟仪器在热处理炉温度监控系统中的应用

针对目前热处理温度监控系统存在的问题,本文提出了基于LabWindows/CVI虚拟仪器开发环境的设计思想.主要讨论了以可编程控制器(PLC)为核心的热处理炉温度控制系统的数据监控系统设计.简单对炉温控制系统进行了硬件设计,讨论PLC和虚拟仪器的数据采集系统的设计.通过虚拟仪器能够实现对工作现场生产过程的实时监控、数据传输、实时处理、温度曲线显示.该系统较好地完成了热处理炉里重要参数的实时全程控制,并且具有显示直观、反应迅速,性价比高等特点,因此具有一定的使用价值.     

面向零件形状的计算机图形库的开发

论述了CAD技术中参数化设计的三种建模方法，重点介绍了基于特征的参数化建模原理。在此基础上，分析机械设计中的机构结构，归纳出其零件的几何特征构成。设计了机构CAD图形库，并提出了该图形库生成步骤和人机交互界面。     

FeCrAIW电弧喷涂层组织的致密化研究

采用激光辐照对FeCrAlW电弧喷涂层的组织进行致密化处理,借助扫描电镜和X衍射对涂层的组织进行了分析.测试了涂层的显微硬度.结果表明:涂层组织致密度提高,孔隙率明显降低.随着激光扫描速度的增加,涂层的显微硬度降低.在较低的扫描速度下,涂层与基体之间形成互熔区,涂层与基体之间产生良好的冶金结合.     

Prospects of the Use of Synergetic Approach to Solution of Problems of the Science of Nanomaterials

A synergetic approach to solution of problems of self-controlled synthesis of nanostructures and creation of self-organizing nanotechnologies is considered in connection with the superproblem of creation of materials with functional properties resembling those of biosystems. __________ Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 55 – 61, July, 2005.     

Kinetics of the oxidation of metals — Influence of self-diffusion of metal

The importance of the self-diffusion of a metal during its oxidation by a gas is treated for the cases of nonstoichiometric oxides having either interstitial cation or cation vacancies. We have established a general relationship for the reaction rate when a mixed diffusion process occurs. From this relationship, we have shown that the pressure dependence can be different, according to whether the rate-determining process is the self-diffusion through the metal or through the product.     

Features of formation of the structure in production of blanks of disks of heat-resistant nickel alloys

Conclusions To provide a high level of mechanical properties in wrought blanks of cast ÉP741NP and ÉP962 alloys it is necessary to form controlled structures. A necklace-type structure formed in homogenizing isostatic treatment, subsequent thermomechanical working including alternation of the operations of deformation in the (+)-area and recrystallization anneals, and final heat treatment is preferable. The temperature conditions of all stages of thermomechanical working are strictly controlled, especially the final operation of deformation and heating for hardening. To eliminate hardening cracks and distortions it is necessary to use molten salts at t=600°C as quenchants. The use of multiple production operations makes it possible to significantly reduce the structural inhomogeneity related to inhertance of the original dendritic structure. However, the structure of the final semifinished product is nevertheless characterized by a difference in occurrence of the processes of polygonization and recrystallization between the former dendritic cells and the interdendritic spaces in deformation and heat treatment.To obtain structurally homogeneous blanks for gas turbine engine parts it is necessary to use basically new methods of remelting such as vacuum double electrode remelting and electron beam remelting with an intermediate vessel.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 25–29, December, 1991.     

Ab-initio calculation of enthalpies of formation of intermetallic compounds and enthalpies of mixing of solid solutions

A large number of ab-initio calculations of energies of formation of intermetallic compounds have been performed in the last 15 years. The currently used methods are listed. The paper presents a review of the aluminium based compounds which have been studied. Comparisons of calculated and experimental enthalpies of formation are provided for aluminim-3d and-4d transition metal alloys at equiatomic composition. The modelling of the enthalpies of mixing of solid solutions based on a given lattice is described.     

试论洋务派教师聘任的思想

洋务派在洋务学堂的办学活动中,为了解决西学专业学科的教学困难,采用了聘请外籍教师的应急措施.他们以真才实学,合同制管理作为主导思想,并认为这种解决师资的途径只是权宜之计,并非久远.从客观上看,洋务派的教师聘任思想有深刻的历史影响.