共查询到18条相似文献,搜索用时 173 毫秒
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国家技术监督局组织14位专家,于1997年7月10日对304所的几何量、力学、热学、电学四大类36项国防最高计量标准进行复查考核。各位专家到各校准实验室对计量标准的溯源性、测量不确定度、人员技术水平与实际操作能力、证书填写、原始记录、环境条件等进行了严格的考核。专家们充分肯定304所已建的36项计量标准,特别对中低温、硬度等几个标准给予了较高评价。对现场考核的29项计量标准给以通过;7项计量标准函审通过。专家们对考核中存在的不足之处,提出了许多建设性意见,希望304所在贯彻执行GJB2725-96国家军用标准中做出新成绩。304… 相似文献
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2004年4月8日,在北京飞机维修工程有限公司(Ameco)举行了中国民航计量检测中心挂牌开业暨中心综合实验楼奠基典礼。民航总局适航司、中国国际航空公司和Ameco等单位的有关领导出席了当天的奠基仪式。民航总局是于2001年决定筹建中国民航计量检测中心,中心的前身是“Ameco校准实验室”,它于2000年7月获得中国实验室国家认可委员会的资质认可,是国内第一家获此认可的企业实验室,其计量检测管理程序符合航空适航法规要求,具有158项国家认可的校准能力和24项北京市质量技术监督局授权的计量标准,迄今主持编写了30多项民航专用计量器具的检定规… 相似文献
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从计量标准及计量人员管理模式等方面,分析了区域国防军工计量管理工作的现状,提出了"十一五"国防军工计量管理工作的新模式和构想,并就今后加强计量管理及计量监督检查工作、提高国防军工计量保障能力提出了一些新思路. 相似文献
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几种特种测试技术在流体机械内流场测试中的应用 总被引:3,自引:0,他引:3
宫武旗 《燃气涡轮试验与研究》2004,17(3):51-55
介绍了现代流动测试技术的特点、发展趋势及本课题组在流体动力设备研发方面的应用研究工作。主要工作有:热线风速仪技术(HWA)用于离心压缩机扩压器流场测试研究、用于湍流边界层的减阻控制研究;粒子图像速度场仪技术(PIV)用于叶轮机械动静相干非定常流场的研究、用于管道内横向射流的研究;激光多普勒测速仪技术(LDV)用于风机叶轮流场的测试研究等。 相似文献
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提出了利用两平面反射镜多次反射来虚拟室外基线场,在室内完成检定光电测距仪及全站型电子速测仪测距部分的解决方案;在现有技术的层面上对该方案所面临的技术难题进行了探讨,对其可行性进行了论证;对该方案实施1000 m测长的不确定度进行了详细的分析和计算,得出了该方案完全可行的结论. 相似文献
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Dynamic temperature prediction of electronic equipment under high altitude long endurance conditions 总被引:1,自引:1,他引:0
Unmanned Aerial Vehicle (UAV) is developing towards the direction of High Altitude Long Endurance (HALE). This will have an important influence on the stability of its airborne electronic equipment using passive thermal management. In this paper, a multi-node transient thermal model for airborne electronic equipment is set up based on the thermal network method to predict their dynamic temperature responses under high altitude and long flight time conditions. Some relevant factors are considered into this temperature prediction model including flight environment, radiation, convection, heat conduction, etc. An experimental chamber simulating a high altitude flight environment was set up to survey the dynamic thermal responses of airborne electronic equipment in a UAV. According to the experimental measurement results, the multi-node transient thermal model is verified without consideration of the effects of flight speed. Then, a modified way about outside flight speed is added into the model to improve the temperature prediction performance. Finally, the corresponding simulation code is developed based on the proposed model. It can realize the dynamic temperature prediction of airborne electronic equipment under HALE conditions. 相似文献
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Role of BIT in support system maintenance and availability 总被引:1,自引:0,他引:1
The role of built in test (BIT) in electronic systems has grown in prominence with the advances in system complexity and concern over maintenance lifecycle costs of large systems. In an environment where standards drive system designs (and provide an avenue for focused advancement in technology), standards for BIT are very much in an evolutionary state. The reasons for advancing the effectiveness of BIT include reduced support overhead, greater, confidence in operation, and increased system availability. The cost of supporting military electronic systems (avionics, communications, and weapons systems) has driven much of the development in BIT technology. But what about the systems that support these end items that contain test and measurement instrumentation - such as automatic test equipment (ATE), simulators and avionics development suites? There has also been a beneficial effect on the maintenance and availability of these systems due to the infusion of BIT into their component assemblies. But the effect has been much more sporadic and fragmented. This paper looks at the state of BIT in test and measurement instruments, explain its affect on system readiness, and present ideas on how to improve BIT technologies and standards. This will not provide definitive answers to BIT development questions, since the factors that affect it are specific to the instrument itself. The topics covered in this paper are: definitions of built-in test, instrument BIT history, importance of BIT fault coverage and isolation in support systems, overview of BIT development process issues that limit the effectiveness of BIT Standards related to instrument BIT, making BIT more effective in support system maintenance and availability and conclusions. 相似文献
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根据全面性、可测性、客观性、层次性以及定量分析与定性分析相结合的原则,经过调查研究和专家讨论,建立评价信息技术对传统产业贡献的综合效果的指标体系,并对模糊综合评判法在其评价中的应用问题进行了研究。 相似文献
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本文对柔性喷管摆动频率特性及其传递函数进行了试验研究,提出测量方法与计算的数学模型.在FG—1042、FG—1043柔性接头的试验中作了实际应用,并在计算机上完成了仿真试验,对提出的测量方法和建立的数学模型作了验证,结果表明,计算结果符合规律,精度能够满足工程的要求. 相似文献