Gaoya dianqi, 2012 发电机定子线圈绝缘在运行过程中要遭受电、热、机械等应力的联合作用而老化,随着中国高龄发电机组日益增多,及时掌握定子线圈绝缘的运行状态显得尤为重要。笔者总结了当今国内外发电机定子线圈绝缘诊断与剩余寿命预测的方法,并以一台18.5 MW/10.5 kV水轮发电机为例,介绍了一种实用的根据电气参量对定子线圈进行绝缘诊断与剩余寿命预测的方法。
任文娥 +3 more
doaj
Gaoya dianqi庞大的输电系统是国家最重要的基础设施之一，确保其在长期风荷载作用下的安全性和可靠性，是应该重视的关键问题。采用Abaqus建立了输电塔线体系的精细化有限元模型，对风荷载进行了模拟，考虑受压杆件失稳，通过动力计算方法分析了塔线体系响应并据此确定了其薄弱位置。进一步地，以薄弱杆件的应力时程为指标，基于Miner线性准则描述的损伤规律，采用雨流法预测了不同风速下塔线体系的寿命；随后研究了风荷载模拟关键参数对结构预测寿命的影响，对线路进行整体上的评估。结果表明：以构件失效作为塔线体系结构整体破坏的准则 ...
张刚 +6 more
doaj
[Performance evaluation of different filtration fractions during daytime continuous renal replacement therapy]. [PDF]
Zhejiang Da Xue Xue Bao Yi Xue BanWang L, Chen Y, Xu G, Xu C.
europepmc +1 more source
[Wearable devices: Perspectives on assessing and monitoring human physiological status]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi, 2023 Peng CK, Cui X, Zhang Z, Yu M.
europepmc +1 more source
Gaoya dianqi文中基于LW30-40.5型SF6断路器全寿命烧蚀试验数据，采用归一化异常指数F反映断路器触头剩余电寿命，0表示电寿命完备，1表示电寿命耗尽。根据断路器分闸动态电阻—行程曲线，提出了将动态电阻—行程曲线上行程大于8 mm且电阻值大于500 μΩ的第一个峰值点作为断路器主触头接触阶段与弧触头接触阶段分界点。据此得到反映断路器触头异常指数F的5个特征参数，采用皮尔逊相关系数法对特征参数进行独立性分析。通过LSTM神经网络建立了基于特征参数与异常指数F之间的回归预测模型，F回归预测均方差和绝对平均误差分别为0.
马飞越 +5 more
doaj
[Progress in electric field assisted molecular imprinting technology]. [PDF]
Se PuWu JY, Huang XJ.
europepmc +1 more source
Report on cardiovascular and cerebrovascular health and diseases in Hunan Province, 2020. [PDF]
Zhong Nan Da Xue Xue Bao Yi Xue Ban, 2023 Hunan Cardiovascular and Cerebrovascular Health and Disease Report Compilation Group.
europepmc +1 more source
[Construction and practice of the "Construction Supports Competitions-Competitions Nurture Teaching-Teaching Promotes Learning" closed-loop innovative teaching mode： a case study of micro-plasma emission spectrometer setup and trace element analysis experiment]. [PDF]
Se PuXue WY +8 more
europepmc +1 more source
[Determination of trace polychlorinated biphenyls in environmental water samples by solid-phase microextraction-gas chromatography-tandem mass spectrometry using carbon nanotube composite microspheres materials]. [PDF]
Se PuSong XL +4 more
europepmc +1 more source
[Analysis of cochlear reimplantation surgery and factors influencing postoperative auditory and speech function]. [PDF]
Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za ZhiBi Q +6 more
europepmc +1 more source