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分析并建立了利用罗氏线圈检测电力电容器外壳爆破能量试验电流的整个测试系统的等效模型.提出并利用MATLAB/SIMULINK仿真环境,构建了由爆破试验回路和罗氏线圈检测回路所构成的整个系统的仿真模型.该模型有利于优化爆破试验回路的试验参数和罗氏线圈的结构与电磁参数.仿真研究和实验结果均表明,所获得的仿真模型是可行的,它可以确保爆破试验的成功以及检测系统具有良好的工作性能. 相似文献
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MATLAB软件在串补电容器型式试验检测系统中的典型应用 总被引:3,自引:1,他引:2
本文分析了电力系统中串补用电容器型式试验时阻尼放电工作机理、回路参数选取方法和基于优化电力系统中串补用电容器型式试验检测系统的结构参数和电气参数,利用MATLAB软件中的SINMULINK仿真环境.建立了整个物理模型的仿真模型,给出了仿真和实验结果。研究表明,文章获得的有关用MATLAB软件巾的SINMULINK仿真环境描述电力系统中串补用电容器型式试验检测系统的物理模型姓可行的,它可为串补用电容器型式试验提供一套合适的仿真平台.以利于优化包括试验回路和检测系统的结构和电气参数。 相似文献
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针对变压器工频短路电流测量需求,研究了外积分式罗氏线圈技术和光纤电流传感技术。建立了2种传感器的低频数学模型,基于MATLAB/Simulink仿真计算传感器对工频短路电流的响应特性,结果表明:罗氏线圈对工频短路电流的测量精度受其下截止频率影响,下截止频率越低,测量精度越高;光纤电流传感器理论上可以精确复现工频短路电流。采用多种电流传感器进行变压器工频短路电流现场对比测试,结果表明:电流比较仪、光纤电流传感器及下截止频率为0.02Hz的罗氏线圈测得的电流波形吻合较好,而下截止频率为0.2Hz的罗氏线圈测量结果出现了明显的偏移,且无法归零,与仿真分析结论基本一致。对于外积分式罗氏线圈,为保证高精度测量,建议下截止频率应低于0.1Hz;光纤电流传感器具有极好的直流及低频响应特性,是工频短路电流高精度测量的理想方案。 相似文献
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为内置集成车辆姿态传感器的ESC能够进行完整的功能和故障安全策略测试,提出在硬件在环(HIL)仿真测试技术中融合运动仿真及电磁阀信号检测方法。三维运动转台通过模拟车辆三轴运动实现对车辆姿态传感器的运动激励;液压控制电磁阀信号检测单元通过霍尔传感器直接对线圈磁场强度进行感应,再通过参数标定实现对阀控制电流的准确采集,继而驱动液压调节器模型;基于悬架KC及轮胎动态试验等数据对整车系统模型进行参数化与调校,使之与实车特性具有较高的一致性;对功能测试内容及各类故障模式进行分析。构建的ESC HIL仿真测试系统平台能够为集成式ESC提供完整的虚拟整车运行环境,开发的测试评价规范可以作为对ESC控制进行评价的有效依据。 相似文献
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差值法与比值法对不同测量系统的误差修正效果不一样.本文将两种方法的比较用一个比值来描述,并用推得的公式进行量化表示.在进一步的应用研究中,理论分析与实验数据相互印证,同时得到许多有益的结论,有助于全面掌握测量系统的误差来源,从而灵活选择各种修正方法以获得更加准确的测量结果. 相似文献
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本文提出了一种采用测量接收机HP8902A测量射频信号源谐波的方法,对该方法的特点及应用范围进行了分析与说明,并通过与常规的频谱分析仪测量谐波的方法进行比较,确定了该测量方法的可行性,可以用于没有频谱分析仪的情况下射频信源谐波的检定。 相似文献
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三峡工程水电站压力管道和蜗壳技术结构型式的选择及论证 总被引:2,自引:0,他引:2
长江三峡水利枢纽工程建设中重大技术问题的决策是建立在大量科学试验和专家论证的基础上,三峡工程水电站压力管道和蜗壳技术结构型式的选择不仅是重大的技术经济问题,也是关系水电站长期运行问题,文章介绍了三峡工程水电站压力管道和蜗壳技术型式选择及决策。 相似文献
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I J Yu Y H Chung S H Maeng K S Song Y M Lee H K Chung H J Kim J I Park S K Lee Y H Lee J S Chang 《Quality Assurance: Good Practice, Regulation, and Law》1999,7(1):57-62
The Korean Society of Good Laboratory Practice (KSGLP) was established Dec. 10, 1998. The objectives of the KSGLP are to enhance the quality of domestic studies and the level of GLP compliance, in safety testing, and to promote information exchange among its members. The activities of KSGLP include: offering workshops and symposiums, linking with related governmental organizations, collecting GLP related information and providing the information to the related organizations, building international networks to collect information and to establish relationship, developing training materials and publishing periodicals, and other business necessary to achieve the objectives of the KSGLP. The KSGLP achieved its goals within a short period of time by offering workshops and symposia, and by providing important GLP related information in newspapers or via the KSGLP's internet homepage (www.ksglp.or.kr). The main role of the KSGLP will be to disseminate GLP technology nationwide. The KSGLP would like to help many labs that are preparing their facilities for GLP compliance. Further, the KSGLP is hoping to share GLP experiences with other members. 相似文献
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Jesper Lützen 《Centaurus; international magazine of the history of science and medicine》2010,52(1):4-37
Today we credit Pierre Wantzel with the first proof (1837) of the impossibility of doubling a cube and trisecting an arbitrary angle by ruler and compass. However two centuries earlier Descartes had put forward what probably counts as the first proof of these impossibilities. In this paper I analyze this proof, as well as the later related proof given by Montucla (1754) and the brief version of this proof published by Condorcet (1775) . I discuss the many novelties of these early arguments and highlight the problematic points addressed by Gauss (1801) and Wantzel. In particular I show that although Descartes developed many of the algebraic techniques used in later proofs he failed to provide an algebraic impossibility proof and resorted to a geometric argument. Montucla and Condorcet turned this proof into an algebraic one. I situate the analysis of the early proof of the impossibility of the two classical problems in the general context of early modern mathematics where mathematics was primarily viewed as a problem solving activity. Within such a paradigm of mathematics impossibility results arguably do not play the role of proper mathematical results, but rather the role of meta-results limiting the problem solving activity. 相似文献
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商标,一枚方寸图案,人们有很多十分形象的表述:有人说它是为商品鸣锣开道的使者,是把企业产品介绍给顾客的"红娘",是企业产品的"护身符",是开启市场的"金钥匙",是产品走向市场的"通行证",是企业跨入国际市场的"金护照".没有自己的商标,就没有自己的市场.随着市场竞争的日益激烈和改革开放的不断深化,商标在经济活动中的地位和作用日益显著. 相似文献
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《Thin solid films》1986,139(3):311-324
A theoretical model which combines gaseous transport and solid state diffusion with the multicomponent equilibria at the gas-pack and gas-coating interfaces was used to study the pack aluminization of iron and steel. It allows the surface composition and the growth rate to be calculated. For a given activator they depend on the temperature and the aluminium activity in the pack. A good agreement is obtained between the theoretical predictions and the experimental results when the parts to be treated are embedded in the pack. Theoretical predictions for deposition in the gas phase, onto substrates out of contact with the pack, can be qualitatively deduced, and the conditions for obtaining uniform coatings in the gas phase are pointed out. 相似文献