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军用自动测试系统(ATE)是军用电子武器要适应现代高技术战争环境下的各军兵种协同作战的综合技术保障需求.这样,需要研究一种通过标准硬件模块组合和更换相应的软件,就可以适应多种武器装备检测需要的通用自动测试系统.本文主要介绍了军用自动测试系统的发展现状及VXI总线技术,并讨论了VXI总线技术在军用自动测试系统中组建的必要性、发展趋向和关键技术. 相似文献
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介绍一种将计算机技术、数字接口技术与仪器测量技术有机结合起来的VXI总线技术,设计了一个洗衣机综合参数的VXI测试系统,这一测量系统和测试技术还可推广到家用电器、汽车行业以及其它测控领域中。 相似文献
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本论文利用基于VXI总线的测试技术与虚拟仪器技术 ,结合铁道部九五技改重点投入项目 ,研制出了首台交流传动内燃机车出厂试验台测试系统。论文从测试系统方案的论证、传感器的选型与配置、硬件系统的选型与配置、软件系统的开发以及对系统进行一些抗干扰措施防护等。经过近两年的试验台运行 ,证明该系统是高精度和高可靠性的 相似文献
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VXI总线专用协议测试模块的设计研究 总被引:1,自引:0,他引:1
随着大量军用综合电子信息系统在部队的应用,系统的装备维护倍受国内外军事装备保障专家的高度关注,研制和开发模块化的军用综合自动测试设备是目前军事装备测试领域的一大发展方向。同时,军用信息系统为完成设备的互连互通,大量采用各种专用传输协议和专用互联装备,协议的测试就成了军用综合测试系统必需解决的课题。因此,结合测试平台的研制,针对专用协议的测试需求,本文就专用的“TDMA”数传专用协议,介绍一种基于VXI总线的测试模块,着重就设计思想、方法、应用和关键技术及解决途径进行研究。 相似文献
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本文论述的是一个基于VXI总线仪器的先进的电路印制板(PCB)自动测试与故障诊断系统,与其它夹具式电路板在线测试仪所不同之处在于它既可对被测电路板进行整体功能测试,又可对单个器件进行在线测试,在对单个器件进行在线测试时无需对被测器件施加任何激励或设保护点,实践证明该系统的测试方法先进,故障定位准确。 相似文献
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本文概括了基于VXI总线的虚拟仪器的结构特点,阐述了其硬件平台和软件框架,并对组建VXI虚拟仪器的几个关键技术进行了着重剖析和探讨。文章最后对VXI虚拟仪器技术的发展趋势作了进一步的展望。 相似文献
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基于VXI总线的机载火控系统自动测试仪的设计 总被引:1,自引:3,他引:1
目的 对作战飞机火控系统的故障检测 ,传统的方法是使用多种检测仪器对机载火控设备进行性能检查 ,不仅技术含量低 ,也给飞机转场后技术阵地的转移带来不便 ,不能满足现代战争的需要 ,为提高战机的作战效能和快速反应的能力 ,研制了机载火控系统自动测试仪 .方法 采用 VXI总线技术、合理的硬件配置和在 Lab Windows/CVI环境下的软件模块化设计方案 .结果 在实际应用中取得了良好效果 ,为技术人员进行机载火控系统的性能及故障检测提供了便利 .结论 该测试仪具有测试结果准确 ,自动化程度高 ,工作稳定可靠 ,操作简便 ,易于转移和维护等优点 ,并具有较高的抗干扰能力 ,不仅适用与内场 ,还可用于在外场对机载火控系统进行原位检测 相似文献
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Design of experiments is a statistical technique to identify and quantify the causes of an effect in an experimental study. The design of experiments based on the response surface methodology (RSM) makes it possible to optimize the number of experiments performed to determine the influence of a number of factors in the final answer. This is very important when such experiments are costly, either in a computational or economic sense, as well as duration. The latter is the case of material creep behavior where the experimental tests can last quite a while. The main objective of this paper is to make use of the response surface methodology using the Small Punch Creep Test for the estimation of the creep parameters. This test is being used today as a feasible alternative for the estimation of creep behavior, especially in those cases when there is not sufficient material to perform standard tests. It basically consists of punching under constant load a miniature specimen, in which the sides of the specimen are clamped between two dies. 相似文献
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Creep of granular materials 总被引:1,自引:0,他引:1
This paper examines the creep of brittle granular materials subjected to one-dimensional compression. One-dimensional creep tests were performed on aggregates of brittle pasta and compared with the behaviour of sand at much higher stress levels. It was found that for both materials, creep strain is proportional to the logarithm of time. One possible mechanism for creep is particle crushing. However, it is usually difficult to measure changes in the particle size distribution during creep because the fines produced are so small, and the mass of fines is too small to measure accurately unless creep is permitted for a very long time. However, for pasta, the particle fragments produced are large, and it is found that particle crushing does occur during creep for 24 hours. This is consistent with the proposition that the behaviour of all brittle granular materials is essentially the same. A micro mechanical argument is then summarised which predicts that creep strain should be proportional to log time. 相似文献
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本文分析了金属和合金高温蠕交时的外应力敏感性和蠕变内应力之间的关系,表明外应力指数的大小不能代表合金蠕变的微观机制,同时,如果选择适当的固溶强化元素,有可能发展具有较大蠕变抗力而不导致高的外应力敏感性的合金. 相似文献
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E. D. Shchukin Victoria N. Izmailova Natalia I. Larionova Michael M. Krasnov Alexandr N. Gurov Anatoly I. Bessonov Galina N. Afanas’eva 《Materials Research Innovations》1998,2(3):147-149
Irreversible stretching (creep) of the eye sclera, considered as a cause of the high myopia, has been studied experimentally.
Both dramatic acceleration and significant deceleration of the sclera creep have been observed in the presence of some enzymes.
Creep of various connective tissues caused by static and cyclic mechanical stresses (gravity, blood pressure, etc.) can manifest
in many age and pathological changes in human body. Authors express the hope that investigations in this area and finding
appropriate inhibitors may replace surgery (eye, cosmetic) by prophylactic therapy.
Received: 21 July 1998 / Accepted: 28 August 1998 相似文献
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N.K. Jain 《Materials at High Temperatures》2013,30(3):153-157
The creep resistance ofelectroslag refined aluminium alloyRR 58 has been studied in the temperature range 450-485°C and compared with that ofpermanent-mould cast, unrefined alloy. The electroslag refined RR 58 had a greater creep resistance than the unrefined alloy; this improvement has been attributed to the reduction in hydrogen content, macroporosity and microporosity, the removal ofoxide inclusions and the fine an uniform dispersion ofsecond phase precipitates in refined alloy. From the estimated activation energy for high temperature creep deformation (155 kJ mol-1), a self-diffusion mechanism has been identified as rate controlling for both refined and unrefinedRR 58. The rate equation ?= A1[sinh (ασ)]nexp(–Q/RT] has been found to be applicable for RR 58 deformed under creep conditions in the range oftemperatures and strain rates studied 相似文献
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叙述了用于满足导弹研制测试需求的基于VXI总线技术开发的先进的自动测试系统,分析了某飞航导弹自动测试系统的功能需求,在此基础上给出测试系统的工作原理.并且详细介绍了测试系统中需要自行研发的RS-422串行通信模块设计,包括串行通信模块总体框图和功能电路设计方案.介绍了32路扫描A/D模块设计及触发模块设计和扫描时序发生器设计. 相似文献