共查询到17条相似文献,搜索用时 171 毫秒
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根据国际热核实验反应堆(ITER)校正场线圈(CC)导体接头低温电阻的测试要求,设计并研制了一套用于超导导体接头的低温测试装置。该装置主要包括10 kA超导变压器、低温测试杜瓦、磁体失超保护系统和数据采集系统等。超导变压器的初级线圈及次级线圈采用LHe浸泡的方式进行冷却。超导变压器初级线圈电流引线采用常规铜电流引线,为增加铜的传热面积,采用编织铜引线代替铜棒引线。初级线圈外接磁体电源,利用电磁感应原理,在次级回路感应出超导导体接头测试所需的电流。已经成功进行了一次CC导体接头的低温实验,接头电阻的测试结果分别为8.4纳欧姆和9.3纳欧姆。 相似文献
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设计并搭建了一套基于G-M低温制冷机的电容式密度测量实验装置,由平行板电容器、样品流体测试腔、充排气体管路、低温制冷机、温度测量与控制单元、压力测量单元、真空绝热保护腔以及高真空排气系统八个部分组成。该系统适用温度测量范围为15—300 K,压力测量范围0.01—0.3 MPa。实验中的低温液体由常温气体经低温制冷机冷却液化得到,并蓄存在装有平行板电容器的样品测试腔内。该测试腔上开有视窗,可用于观察冷却过程中低温液体的形成及其液位。对受控压力及温度下的液氮、液氩两种低温流体的密度进行了测量,所得数据与文献实验值及美国NIST标准数据吻合良好,液相区相对偏差小于±0.5%。该密度测量系统今后可用于测量其他流体(包括混合物)在低温下的p-ρ-T数据,还有望经过改进和集成化设计后实现LNG和空分等工业领域的低温流体密度在线实时监测。 相似文献
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基于交流电位法的疲劳裂纹长度测量方法与装置 总被引:1,自引:0,他引:1
《理化检验(物理分册)》2015,(8)
阐述了交流电位法测量疲劳裂纹长度的原理和方法,并研制了一套基于交流电位法的疲劳裂纹长度测量装置。该测量装置以LabVIEW为平台,构成了虚拟仪器系统,对数据进行采集、分析和处理,实现了可视化操作、自动测量、曲线显示和数据保存等功能。利用该设备测试了Ti1023钛合金和7055铝合金两种材料试样的疲劳裂纹扩展情况。试验结果表明:该设备的分辨率小于1μm,利用该装置可以连续测试电压随疲劳周次的变化曲线,并根据标定关系实时转换成裂纹长度随疲劳周次的变化曲线。 相似文献
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空间材料二次电子发射特性测试 总被引:6,自引:4,他引:6
空间材料的二次电子发射系数是表征航天器表面充电状态的重要参数 ,对于卫星表面带电的预测及卫星防带电设计选材具有重要的作用。为了测量空间材料二次电子发射特性 ,研制了专门的测试装置。介绍了该实验装置的主要结构、性能及技术指标等 ,通过应用计算机数据采集系统 ,并研制专门的数据处理软件 ,提高了装置的自动测量能力。实验说明 ,该装置用于空间材料的二次电子发射特性测试中测量方便、准确 相似文献
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Under the contract with Air Force Research Lab (AFRL), General Electric has successfully tested a high speed, superconducting generator for a Multimegawatt Electric Power System (MEPS). As the first successful full-power test of a superconducting generator for the Air Force, the demonstration tested the generator’s load up to 1.3 MW and over 10,000 rpm. A key component of the generator system is a closed loop cryo-refrigeration system to cool the field excitation coil at liquid neon temperature. This paper reports the design and tests of the cryogenic system, including the liquid neon dewar, cryogenic cooling loop for the high temperature superconducting (HTS) field coil and the cryostat. Performance data during both short-term load run and long-term non-load run were presented. Also, some key issues to design a reliable cryogenic system for a superconducting generator were discussed. 相似文献
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实用化高温超导带材(如Bi系与ReBCO高温超导复合带材)在高磁场下拥有较高的临界电流密度、宽泛的温度裕度、较强的抗粒子辐照能力及良好的机械特性,因此这类材料在加速器超导磁体系统、高场超导磁体、超导电力等方面表现出巨大的应用潜力。而作为典型的多层功能复合性材料,虽然高强度的基底层增强了高温超导带材拉伸强度,使其在强磁场、高载流条件下可以承受很高的应力,在其加工与运行过程中,不可避免地受到多种疲劳载荷的作用,从而其临界载流能力会显著地降低,进一步,会造成相应高温超导装置功能性难以达到设计标准等。该文介绍一种自主研制的高温超导带材低/变温疲劳性能测试系统,基于该测试系统:一方面,可以实现对高温超导材料在低/变温、疲劳载荷等环境下力学、热学等宏观参数的实验表征研究;另一方面,可以对高温超导材料开展低温疲劳载荷环境下力-电弱化等临界特性的实验研究。利用所研制的低/变温疲劳性能测试系统,对受拉-压疲劳荷载下的YBCO超导带材的力学行为、载流特性开展了初步的实验研究,并分析了应力比、温度等外部环境因素对实验结果的影响规律等。结果表明:在相同的疲劳次数的情况下,YBCO超导带材的力学性能及载流特性与其应力比成明显的非线性关系。该测试系统的成功研制将为中国粒子加速器用高温超导磁体的设计与研发提供基础测试平台。 相似文献
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A versatile cryogenic test bed, based on circulating cryogenic helium gas, has been designed, fabricated, and installed at the Florida State University Center for Advanced Power Systems (FSU-CAPS). The test bed is being used to understand the benefits of integrating the cryogenic systems of multiple superconducting power devices. The helium circulation system operates with four sets of cryocooler and heat exchanger combinations. The maximum operating pressure of the system is 2.1 MPa. The efficacy of helium circulation systems in cooling superconducting power devices is evaluated using a 30-m-long simulated superconducting cable in a flexible cryostat. Experiments were conducted at various mass flow rates and a variety of heat load profiles. A 1-D thermal model was developed to understand the effect of the gas flow parameters on the thermal gradients along the cable. Experimental results are in close agreement with the results from the thermal model. 相似文献
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M. C. Lin C. Wang M. H. Chang F. T. Chung M. S. Yeh Y. H. Lin L. J. Chen M. H. Tsai T. T. Yang C. H. Lo T. C. Yu L. H. Chang F. Z. Hsiao H. H. Tsai W. S. Chiou H. C. Li T. F. Lin 《Journal of Superconductivity and Novel Magnetism》2013,26(5):1479-1483
A proper cryogenic environment is essential for the operation of superconducting devices. A test area for the superconducting radio-frequency modules (SRF) has been established in the RF laboratory at National Synchrotron Radiation Research Center in Taiwan; these modules require much liquid helium during conditioning and performance tests; a cooling capacity of 120 W is expected for the acceptance test of the SRF module. The cryogenic environment of the test area is completed on transferring the liquid helium over a remarkable length of 205 m from the two cryogenic plants at Taiwan Light Source, with a valve box located at each end to control and to measure the cryogenic flow. Flexible cryogenic transfer lines of concentric four-tube type are chosen for both the supply of liquid helium and the return of cold helium gas. Functional examination of this long transfer system was first achieved with a 500-L Dewar in the radio-frequency laboratory; an SRF module was then installed in the test area for practical operation. The primary concern about the cryogenic transfer system is the heat loss; a measurement technique based on the principle of thermodynamics is developed and proposed herein. With the available sensors inside the valve boxes and the heaters inside the 500-L Dewar and the test SRF module, this technique has proved promissing from the measured results. 相似文献
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EAST超导托卡马克的纵场和极向场磁体均采用NbTi超导材料,由3.8 K超临界氦冷却.在托卡马克实验运行时,极向场的放电脉冲和等离子体破裂产生的交流损耗带来的热负荷增加,经过超临界氦流带到低温系统控制阀箱内的液氦槽和过冷槽,造成槽内的液氦蒸发量增加.蒸发的氦回到制冷机中,从而影响制冷机的稳定运行.通过对实际超临界管道和液氦槽、过冷槽中换热过程建立换热模型,进行热工分析,分析液氦槽和过冷槽中的压力等参数的变化,指导低温系统的设计. 相似文献