Results 71 to 80 of about 509 (166)
Status and prospects of joint inversion of geophysical electromagnetic data [PDF]
Geophysical electromagnetic data inversion is a typical underdetermined problem. Due to the limitations of observational data, individual geophysical methods often suffer from significant non-uniqueness and uncertainty, making it challenging to provide ...
Changchun Yin +4 more
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第九届电工技术前沿问题学术论坛“电力装备绝缘与放电计算学”分论坛及期刊专题征稿
Gaoya dianqi, 2020 能源结构转型和可再生能源大规模开发利用促使电网系统开始新一轮的重大变革,特别是以多端柔性直流输配电技术为代表的新技术的快速发展,不断催生出大量的新型电力装备。由于电力装备的工作场景复杂,往往涉及绝缘与放电中的多物理场耦合过程,还涉及到电磁场、放电等离子体等复杂现象与材料的相互作用,导致目前电力装备的研发与设计周期较长,研发成本较高。能否获得更为准确的计算方法 ...
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Gaoya dianqi, 2023 直流电压下油纸绝缘的局部放电（partial discharge,PD）关系着换流变压器等关键输变电设备的安全可靠，而计算机技术的迅猛发展则促使PD数值仿真成为了探究PD机理、评估PD威胁的重要手段。文中首先阐述了PD仿真模型的研究现状，综述了abc电容模型、感应电荷概念模型、静电场模型、电流场模型以及迁移—扩散模型的建立机制及优缺点；其次，进一步分析了PD模型在交、直流电压下的主要差异以及目前直流电压下PD仿真的研究进展；最后，从仿真参数的确定以及多物理场的耦合两方面出发 ...
倪鹤立 +3 more
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Mechanical model of deformation-seepage-erosion for Karst collapse column water inrush and its application [PDF]
With the extension of coal mining in China, fault water inrush has become one of major disasters threatening the safety of coal mine production. Based on the research results related to the mining-induced fault water inrush, this paper proposes a ...
Banghua YAO +6 more
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Gaoya dianqi, 2020 在电力系统安全事故中,污闪事故因影响面积大、时间长,往往导致较为严重的经济损失。为了探究气流场和电场耦合作用下绝缘子的积污特性及绝缘子表面积污量对各影响因素的敏感程度,文中利用多物理场仿真软件建立了典型绝缘子的风洞积污模型,提出了结合抽样调查和特征粒子分析的特征粒子追踪方法。仿真在计算流体动力学的基础上引入交、直流电场的作用,对污秽粒子在一个运动周期内的轨迹进行追踪研究,并根据对单一粒径及荷电量样本仿真结果的加权平均值来确定绝缘子整体积污特性。仿真结果表明,绝缘子表面积污量是电场强度 ...
杨佳欣 +5 more
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基于接触电阻模型的电缆接头复合材料界面温度及应力分布仿真研究
Gaoya dianqi, 2021 为研究接触电阻过大而导致的压接缺陷对电缆接头温度及应力分布的影响,文中基于等效电导率的接触电阻理论,采用有限元软件建立了220 kV高压电缆接头压接缺陷下的电磁—热—应力多物理场耦合仿真模型,研究了电缆接头压接缺陷工况下预制件内硅橡胶绝缘/高压半导电复合材料界面温度和热应力特性的变化规律,并对不同负荷电流I和接触系数k下的温度、应力数据进行多元函数拟合,得到相应的计算方法。结果表明:高压电缆接头存在压接缺陷(如接触系数k=6)工况下,其复合材料界面热应力畸变了4.32倍 ...
梁振, 彭杰, 胡军
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Comparative study on effect of microstructure characteristics on adsorption of CH4 and CO2 in anthracite based on molecular simulation [PDF]
In order to explore the effects of pore size, aromatic lamellar stacking degree, aromatic lamellar ductility, gas temperature and gas pressure on the competitive adsorption of CH4 and CO2, the No.3 coal from Jincheng mining area was taken as the research
Bing SHAO +6 more
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Gaoya dianqi, 2020 近年来,电力系统断路器操动机构拒动故障频发,严重影响电力系统安全稳定运行。分合闸线圈电流包含了大量的机构状态信息,能够很好反映机构的运行状态。但在实际运行中,不同状态下的分合闸线圈电流数据难以获取,导致无法实现数据的横向对比,也就无法有效通过分合闸线圈电流判断机构状态。为获取分合闸线圈不同状态下的电流曲线,建立了分合闸线圈三维电—磁—运动多物理场耦合模型,同时基于分合闸线圈的试验数据对仿真模型参数进行修正,最后得到的分合闸线圈仿真计算模型精度较高,具有重要的工程应用价值。
易林 +5 more
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Optimization and Verification of One-dimensional Three-field Model for Transient Analysis of Pressurized Water Reactor [PDF]
The rapid development of China’s nuclear power industry, encompassing both domestic innovation and international exports, has created an urgent need for localized nuclear power software solutions. As essential components of such software, system analysis
YUAN Leqi1, LI Zanwang1, 2, FAN Jie1, 3, GOU Junli1, SHAN Jianqiang1
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