期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
干式空心电抗器振荡型冲击电压检测方法研究 被引量:4
1
作者 袁妮 侯晓楠 +2 位作者 陈欢 张轩瑞 李军浩 《高压电器》 CAS CSCD 北大核心 2022年第10期121-127,共7页
振荡型冲击电压具有效率高、易于调波的优点,适合作为现场冲击电压试验波形,但未有针对干式空心电抗器施加振荡型冲击电压的相关研究。因此文中针对干式空心电抗器的结构,设计了振荡型冲击电压实验系统,并在45 mH和360μH空心电抗器进... 振荡型冲击电压具有效率高、易于调波的优点,适合作为现场冲击电压试验波形,但未有针对干式空心电抗器施加振荡型冲击电压的相关研究。因此文中针对干式空心电抗器的结构,设计了振荡型冲击电压实验系统,并在45 mH和360μH空心电抗器进行振荡冲击电压实验,通过振荡频率和传递函数的变化对干式空心电抗器进行故障检测。研究发现,电感值在1 mH以下空心电抗器不同位置的短路会导致波形振荡频率明显升高,空心电抗器短路故障时传递函数峰值的频率和幅值较正常状态有明显改变,利用频率法和传递函数法可以准确检测出干式空心电抗器的短路故障。 展开更多
关键词 振荡型冲击电压 频率检测法 传递函数 干式空心电抗器
在线阅读 下载PDF
Automatic detection of respiratory rate from electrocardiogram,respiration induced plethysmography and 3D acceleration signals 被引量:3
2
作者 刘官正 吴丹 +2 位作者 梅占勇 朱青松 王磊 《Journal of Central South University》 SCIE EI CAS 2013年第9期2423-2431,共9页
Respiratory monitoring is increasingly used in clinical and healthcare practices to diagnose chronic cardio-pulmonary functional diseases during various routine activities.Wearable medical devices have realized the po... Respiratory monitoring is increasingly used in clinical and healthcare practices to diagnose chronic cardio-pulmonary functional diseases during various routine activities.Wearable medical devices have realized the possibilities of ubiquitous respiratory monitoring,however,relatively little attention is paid to accuracy and reliability.In previous study,a wearable respiration biofeedback system was designed.In this work,three kinds of signals were mixed to extract respiratory rate,i.e.,respiration inductive plethysmography(RIP),3D-acceleration and ECG.In-situ experiments with twelve subjects indicate that the method significantly improves the accuracy and reliability over a dynamic range of respiration rate.It is possible to derive respiration rate from three signals within mean absolute percentage error 4.37%of a reference gold standard.Similarly studies derive respiratory rate from single-lead ECG within mean absolute percentage error 17%of a reference gold standard. 展开更多
关键词 respiration inductive plethysmography respiratory rate ELECTROCARDIOGRAM 3D acceleration activity
在线阅读 下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部