共查询到20条相似文献,搜索用时 24 毫秒
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低噪声液压泵计算机辅助测试平台是测试液压泵噪声、提高液压泵测试精度以及设计、改进其性能的重要手段之一。本文从液压泵测试平台结构、液压回路、传感回路、传感器、接口及测试软件入手,建立起一套集试验系统,数据采集、处理、分析为一体的低噪声液压泵计算机测试系统。 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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A. Bodi 《Measurement Techniques》1962,5(12):1028-1032
Conclusions The relationships thus derived for the condition of Ri0 provide a reasonable approach to the selection of the amplification constant k=1+, and make it possible to determine the maximum value of the relative error (12) which is smaller than for the case of k=1 (7).Under actual conditions 21 for a phase shift angle=0 can only be obtained by means of multistage amplifiers.Our tests have shown good agreement with the theoretical conclusions. 相似文献
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开发一套基于PC机的内燃机燃烧测试分析系统,并对气缸压力的采集,数据的匀化、光顺处理,动态上止点位置的确定等做介绍。利用测量的气缸压力曲线和能量守恒原理,在LabVIEW软件平台上编写出内燃机燃烧放热率计算程序,研究主要经验参数对放热率及缸内平均温度的影响。结果表明:采用Woschni传热公式计算的放热率曲线值高于采用Eichelberg传热公式和Sitkei传热公式计算的放热率曲线值。扫气系数φs的变化对气缸内平均温度有显著影响,φs=0.99时的缸内平均温度明显高于φs=0.95时的缸内平均温度,两者最高温度相差81.4 K。 相似文献
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为提高森林消防泵的使用性能和开发速度,针对其低流量、高扬程、高转速的专业特点,设计了森林消防泵性能测试系统.该测试系统采用开式试验装置,由工控机、数据采集模块和水泵试验台组成,通过交流电力测功机反拖提供系统动力,带动森林消防泵工作,并将试验数据传输到工控机进行处理.最后以研制的新型BJL5C森林消防泵为例进行试验,结果表明系统稳定可靠.该测试系统实现了自动化测试,且精度高、转速高、传输速率高,符合国家标准规范,能够满足森林消防泵的测试要求,对该类型森林消防泵的研究和改进提供指导依据. 相似文献
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V. A. Klyuev 《Measurement Techniques》1991,34(6):574-576
Translated from Izmeritel'naya Tekhnika, No. 6, pp. 31–32, June, 1991. 相似文献
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《低温学》2018
In order to cover long-term but small quantity liquid nitrogen requirements of laboratory or field users, a miniature movable mixed-refrigerant liquid nitrogen generator (MRLN) was developed and tested here, based on a precooled mixed-refrigerant J-T (MRJT) refrigerator. With the full air-cooled, skid-mounted structure, this MRLN was built utilizing off-the-shelf refrigeration components like commercial single-stage oil-lubricated compressors to reduce construction cost greatly. Bottled pure N2, pressure swing adsorption (PSA) unit and mini cryogenic rectification column could be employed to supply N2 in different operation modes respectively. In pure N2 mode, N2 was directly liquefied by the MRJT refrigerator. With feed N2 at 0.8 MPa, the specific power consumption (SPC) was 1.79 kWh L−1, and figure of merit (FOM) was 6.27%. The estimated SPC in PSA mode was 2.68 kWh L−1. For column mode, the SPC was 4.59 kWh L−1, with FOM of 3.38%. A closed N2 cycle could convey cooling capacity between flammable refrigerant and air. This MRLN could be a convenient and low-costing choice for some liquid nitrogen users. 相似文献
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采用荧光分光光度法测试荧光素和罗丹明B作为荧光示踪剂的性能及介绍其在光生酸剂产酸测试中的应用。测试了膜中荧光素和罗丹明B两种示踪剂荧光强度与酸浓度的变化关系,比较了荧光素和罗丹明B在测试光生酸剂产酸中的性能优劣,从而得出了较优秀的荧光示踪剂。 相似文献
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安爱明 《制冷与空调(北京)》2022,(1)
海水源热泵是直接或间接利用海水的能量进行冬季供暖、夏季供冷、全年热水供应的技术。文章分析了青岛地区采用直接热利用和间接热利用的两个工程实例,测试了两个热泵系统实际运行性能,并进行了节能性、技术性和经济性对比分析。根据测试及数据分析,与间接热利用系统相比,直接热利用的系统COP值高,初投资低,节能效益好,在采取措施保证热泵系统使用寿命的前提下,推荐采用直接热利用系统。 相似文献