基于LabVIEW的环境试验设备温湿度实时监测校准系统

采用先进的虚拟仪器技术,利用FLUKE2635A数据采集器,开发一套人机界面友好、高效、便捷的环境试验设备温湿度实时监测校准系统,对温湿度进行采集、显示、处理、保存、打印等过程,解决了目前在用的大量温湿度试验箱的校准和测试存在的问题。     

基于Win CC和S7-300的主井提升装载系统

本文采用人机界面友好的Win CC和抗干扰能力强的西门子系列PLC S7-300设计了主矿井提升装载系统,详细介绍系统硬件结构和软件设计。该系统集数据采集、存储、分析和处理功能于一体。界面友好、实时可靠的实现提升装载的控制和监测。     

滚动轴承试验机远程监测系统的设计与应用

利用虚拟仪器、数据库和无线网络技术设计开发基于C/S与B/S混合结构的滚动轴承远程监测系统,整个系统由下位机实时监测子系统、上位机监测诊断子系统以及两者的数据通信3部分组成,能够满足实时数据的获取与处理(尤其是大型二进制数据的存储问题)、异常数据的筛选与上传以及远程用户的信号分析和故障诊断等工作。对6309深沟球轴承的全寿命周期试验结果表明:该系统能够实时监测轴承的运行状态,并通过对筛选后的异常数据进一步分析得到故障原因和故障部位,具有较高的实用价值。     

列车车载蓄电池组参数在线监测系统研发

为保证列车蓄电池安全可靠工作,需要对其运行参数进行在线监测。基于美国国家仪器公司(NI)的软硬件平台,利用基于接口电路的一体化仪器技术和虚拟仪器技术,设计并开发在线监测系统,克服目前列车车载蓄电池监测系统的量程小、准确度低等缺点,能够对蓄电池组的温度、电压和电流等参数同时进行监测、保存以及回放。测试结果表明:该测试系统具有使用方便、检测精度较高、工作稳定可靠、人机界面友好等特点。     

基于LabVIEW和ZigBee的垂直轴风力机无线监测系统

风力机监测系统对风力发电机的研究应用具有重要意义。针对目前垂直轴风力机(vertical axis wind turbine,VAWT)监测系统发展不够成熟的问题,设计一种基于ZigBee无线通信技术的垂直轴风力机在线监测系统,并基于LabVIEW虚拟仪器技术编写上位机界面,实现监测参数在线采集与数据存储。实验表明:该系统能够实时采集风力机的运行参数与环境参数,完成监测任务,具有较好的应用前景。     

虚拟仪器在交流电机转速控制系统中的应用

针对传统电机采用单片机控制的一些不足，提出了一种基于虚拟仪器的交流电机转速控制系统的软件设计方法，并介绍了PID控制算法的设计。该设计采用虚拟仪器突破了传统仪器在数据处理、显示、存储等方面的限制，并能实时地对采集的数据进行分析和处理，最后达到对电机的转速实现控制的目的。该系统具有界面友好、人机交互性强、编程简单、操作方便、控制效果好等优点。     

虚拟仪器技术在1∶1摩擦试验平台中的应用

将虚拟仪器技术应用于现代测控系统，利用计算机的软、硬件资源代替传统测控仪器中大量的硬件，已经成为测控系统发展的一个重要方向。提出一种基于虚拟仪器技术的智能测控系统。该系统有效的运用于1：1摩擦试验平台，实现实时多通道数据采集、实时数据处理及显示、试验数据的后期分析处理、以及生成及打印试验报告等功能。     

基于虚拟仪器技术的膛口烟雾测试系统

针对轻武器膛口烟雾测试手段需求,本文在分析膛口烟雾测试原理的基础上,详细叙述了基于VxI总线的膛口烟雾的测试方法、系统组成及其基于虚拟仪器的软件设计.由于采用了计算机技术、虚拟仪器技术,因此该测试方法具有测试精度高、人机界面友好、便于操作、重复性好的特点.     

机载设备供电电源检测系统的设计

该机载设备供电电源检测系统的信号采集部分由单片机89C51、A／D转换器、电压和电流互感器以及相应的信号调理电路组成，硬件结构紧凑；上位计算机软件采用虚拟仪器软件LabWindows／CVI6．0开发，通过串口通信实现了对电源参数的实时采集和监控，软件功能强大且人机界面友好。该系统实现了飞机检修过程中电源的动态检测和故障定位，具有检测实时、故障诊断准确等特点。     

基于VC的冲击加速度标准装置测控系统

基于VC平台开发了一套用于冲击加速度标准装置的测控系统,重点对系统的软件和数据采集分析进行了研究。系统采用虚拟仪器技术,人机界面友好,操作方便,在提高冲击校准的可靠性和准确性的同时也较大地提高了冲击校准的效率。     

A high data rate recorder for astronomy

A magnetic tape recorder developed for the special requirements of radio astronomy and geodesy is described. These requirements include a high bit packing density and long record times. The current version of this longitudinal recorder used by the Very Long Baseline Array (VLBA) records 5.5 Terabits on a 14-in diameter reel of inch-wide tape. A maximum record rate of 256 Mb/s is achieved in the VLBA configuration with one recorder operating at 4 ms and utilizing 32 of the heads in a single stack. The VLBA recorders have been tested using a longitudinal density of 2.25 fr/μm (57.15 kfrpi); 448 data +56 system tracks are recorded in 14 passes, each lasting 50 min, for a total record time (at 128 Mb/s) of 12 h on 14-in diameter reel of inch-wide 13-μ-thick D1-equivalent tape     

Efficiency of magnetic recorder heads

High-permeability alloys of the composition 80-percent Ni, 4-percent Mo, remainder Fe, are generally used for recorder heads. The annealing temperature for highest initial permeability in such alloys is 2150°F. This high annealing temperature is not desirable for recorder head laminations since it makes the laminations too soft. Theoretical guidelines for calculating the necessary permeability of recorder head laminations are presented. The lowest possible annealing temperature, yielding sttfficient permeability and high hardness, can be selected from the given experimental data.     

A High-Accuracy Computer-Aided Profile-Measuring Machine

This paper describes a system for the high-precision, rapid measurement and evaluation of rotatable object profiles such as cam's. The data are acquired off-line by sampling with a high-resolution optical encoder and are recorded on magnetic tape via an incremental recorder. The recorded data are subsequently analyzed by a computer program to provide the required parameters. The system is characterized by ease of operation, high precision, repeatability, and relative simplicity. It makes available an automated measurement capability that was previously only possible by manual methods on an optical lathe or a measuring engine.     

抗高过载防护结构的设计与性能测试

目的弹载记录仪在回收过程中,存在记录仪因硬着陆产生的高冲击力和高过载加速度使仪器损毁而致有效数据失效的现象。针对该问题设计新型双层壳体两级缓冲隔离的电路防护结构,并进行性能测试。方法结合Ansys/Workbench有限元数值模拟软件仿真分析该结构在冲击过程中的形变和受冲击过载特性,同时使用马歇特锤对使用该防护结构的记录仪模拟高冲击、高过载环境实验,由记录仪存储双层防护壳体内外嵌入的加速度传感器信号,并对多次试验信号数据进行处理和分析。结果在过载加速度小于25 000g时,该多层防护结构具有良好的缓冲效果,对记录仪保护效果良好;各层材料的声阻抗差别会影响整体保护效果,差别越大效果越好。结论该防护结构在高过载冲击环境下能有效衰减冲击效应,保护电子设备的安全。     

棒材浊环水强力穿水冷却设备

具有自主知识产权的棒材强力浊环水冷却设备的问世，为QTB工艺的实施提供了物质基础。其强力冷却机理是由于冷却介质中引入可固体颗粒的结果，浊环水中的杂质导致了冷却水气化率的提高和气泡寿命的缩短。文中也介绍了设备的主要结构、特点和应用效果。     

The S2 very long baseline interferometry tape recorder

The S2 is a new generation very long baseline interferometry (VLBI) tape recorder designed at the Institute for Space and Terrestrial Science (ISTS). The unique features of the S2 are its use of consumer-type videocassette transports to achieve low-cost, high data rate, high-density recordings; modularity in system design and extensive internal system self-monitor and diagnosis; and standardized record and playback interfaces for VLBI systems compatibility. The S2 sustains a maximum data rate of 128 megabits per second for up to 8.5 h, and has a maximum storage capacity of approximately 4·10¹² bits; multiple S2's may be used for increased data rates of 512 megabits per second and beyond. This paper reviews the role of the VLBI tape recorder in the signal-processing chain of a complete VLBI system, a system in which it may be argued that the VLBI recorder has historically been the weakest link, then describes the S2 and its key features which serve to increase the reliability of the recorder in the VLBI data acquisition process at the radio telescope and the general means by which S2 recorded data may be reproduced at the VLBI correlator     

弹载加速度记录仪在冲击环境下的失效研究

在弹体侵彻过程中,首先分析高g值冲击对弹载加速度记录仪的影响,得出应力波作用下加载到弹体内记录仪的加速度值,并研究了加速度记录仪壳体、缓冲材料及电路板的动态结构响应,进而提出可能出现的失效模式：壳体结构的失效、缓冲材料缓冲性能的不足、芯片与PCB板相对运动导致芯片的裂纹。针对各失效模式,利用ANSYS/LS-DYNA对记录仪各防护单元进行了数值模拟仿真,得出各防护单元失效的临界冲击加速度值: 电路板失效的临界冲击加速度为1.93×104g,当加载冲击加速度为1.63×105g时,壳体发生屈曲;增大冲击加速度至5.63×106g时,缓冲材料失效。经过实弹侵彻试验,得出记录仪在1.5×105g的冲击加速度下失效。该实验结果对后续弹体实际侵彻弹载记录仪的设计及优化提供数据支撑。     

Reflective grating interferometer: a folded reversal and shearing wave-front interferometer

The reflecting grating interferometer (RGI) is a folded and reversal wave-front interferometer sensitive only to asymmetrical aberrations such as third-order coma. The RGI can isolate and evaluate coma both in nearly collimated and in noncollimated beams. We propose a RGI with a different optical configuration that includes a lateral shearing in addition to folding and reversal operations. With lateral shear, the RGI also becomes sensitive to other terms of third-order aberrations such as defocusing, astigmatism, and spherical aberration. Optical path difference equations for interpreting interferograms and numerical simulations are presented to show how the interferometer works in the shearing configuration. Its potential applications are described and discussed.     

Flux storage characterstics of thin magnetic films for analog operation

Thin magnetic films may be employed as storage elements of a sampling recorder for measuring transient signals. By writing into successive films with a given signal at known time intervals and then utilizing the magnetization transfer characteristics, i.e., readout voltage versus write current, a time-amplitude reconstruction of the signal can be obtained. This mode of operation for a coupled thin magnetic film configuration, along with the difficulties in nondestructively reading out the film, is discussed.     

三维尺寸视觉测量系统

视觉测量技术是一种先进的非接触测量手段,具有系统组成灵活、工作空间大、精度合适、自动化程度高等特点,非常适合工业现场的在线测量与质量监控。本文分析视觉测量的原理及视觉测量系统的组成,研究了一个实际的视觉测量系统。