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换流变压器绕组及其套管附件结构机械振动特性理论建模及试验验证分析 被引量:1
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作者 张施令 季巧宇 李玥 《电工技术》 2023年第11期18-24,29,共8页
国内特高压直流输电线路发展迅速,其中换流变压器及其套管附件为典型电力装备,主要聚焦于6300 A大电流和800 kV高电压作用下关键电力装备机械振动特性理论建模与试验验证分析。首先分析了特高压换流站中使用的典型电力装备技术参数特性... 国内特高压直流输电线路发展迅速,其中换流变压器及其套管附件为典型电力装备,主要聚焦于6300 A大电流和800 kV高电压作用下关键电力装备机械振动特性理论建模与试验验证分析。首先分析了特高压换流站中使用的典型电力装备技术参数特性,提出换流变压器“场-路耦合”模型等效电路,并推导出“场-路耦合”模型三维图谱,获得了在不同振动信号作用下特高压换流变压器绕组及其附件套管结构将呈现不同的谐振特征。应用带通滤波器分析振动信号时间序列,表明带通滤波器限制频率为0~2000 Hz,可通过频率为2000~5000 Hz,进行傅里叶分解后发现信号幅值峰值出现在1000 Hz和2000 Hz附近。进一步,对换流变压器绕组及其套管附件结构短路电磁力及现场事故分析发现最大短路电流发生在t=0.01 s时刻,且其SVM辨识正确率为91.3%。该研究对于换流变压器及其套管附件典型电力装备基于振动信号的故障诊断具有指导意义。 展开更多
关键词 换流变压器 机械振动特性 场-路耦合 谐振特征 带通滤波器 短路电磁力
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正弦振动控制技术的研究 被引量:8
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作者 袁宏杰 李传日 +1 位作者 殷雪岩 谢飞 《电气自动化》 北大核心 2001年第2期25-27,共3页
介绍了扫频正弦信号产生的方法,讨论了估计正弦信号幅值的方法,给出了幅值修正公式,研究了多点振动控制技术。
关键词 正弦振动控制 振动 机械振动特性 数字振动控制仪
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基于小波分析的电机故障诊断研究 被引量:5
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作者 冷军发 荆双喜 李臻 《大电机技术》 北大核心 2003年第5期28-30,共3页
详细地分析了电机的机械振动特性和小波多分辨分析原理。通过具体实验 ,表明了小波分析的良好时频局部化特性在电机机械故障诊断方面的有效性 ,并为其它机械故障诊断提供了有效的分析手段。
关键词 电机 故障诊断 小波分析 机械振动特性 特征额率
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Mechanical Stability Analysis of BPM Support at SSRF 被引量:2
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作者 王晓 曹云 +2 位作者 陈亮 杜涵文 殷立新 《Chinese Physics C》 SCIE CAS CSCD 北大核心 2008年第z1期28-30,共3页
This paper concentrates on investigating the mechanical stability of a Beam Position Monitor (BMP)support prototype of the Shanghai Synchrotron Radiation Facility(SSRF)project.Both finite element analysis and vibratio... This paper concentrates on investigating the mechanical stability of a Beam Position Monitor (BMP)support prototype of the Shanghai Synchrotron Radiation Facility(SSRF)project.Both finite element analysis and vibration measurements have been performed.Inconsistent results between the simulations and experiments motivate us to study three connections between the support and the ground:ground bolt(used in the initial design),part grout and full grout(proposed in the later research).After changing the connection, the first eigenfrequency is increased from 20.2Hz to 50.2Hz,and the ratio of the integrated RMS displacement (4—50Hz)is decreased from 4.36 to 1.23 in the lateral direction.The mechanical stability is improved greatly. 展开更多
关键词 vibration measurement Mechanical stability finite element EIGENFREQUENCY
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Review of cavity optomechanics in the weak-coupling regime: from linearization to intrinsic nonlinear interactions 被引量:6
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作者 XIONG Hao SI LiuGang +2 位作者 LV XinYou YANG XiaoXue WU Ying 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第5期16-28,共13页
Recently, cavity optomechanics has become a rapidly developing research field exploring the coupling between the optical field and mechanical oscillation. Cavity optomechanical systems were predicted to exhibit rich a... Recently, cavity optomechanics has become a rapidly developing research field exploring the coupling between the optical field and mechanical oscillation. Cavity optomechanical systems were predicted to exhibit rich and nontrivial effects due to the nonlinear optomechanical interaction. However, most progress during the past years have focused on the linearization of the optomechanical interaction, which ignored the intrinsic nonlinear nature of the optomechanical coupling. Exploring nonlinear optomechanical interaction is of growing interest in both classical and quantum mechanisms, and nonlinear optomechanical interaction has emerged as an important new frontier in cavity optomechanics. It enables many applications ranging from single-photon sources to generation of nonclassical states. Here, we give a brief review of these developments and discuss some of the current challenges in this field. 展开更多
关键词 cavity optomechanics nonlinear interactions weak-coupling regime radiation pressure
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Maximal-overlap adaptive multiwavelet for detecting transient vibration responses from dynastic signal of rotating machineries
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作者 HE ShuiLong ZI YanYang +3 位作者 ZHAO ChenLu CHEN BinQiang WANG XiaoDong HE ZhengJia 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第1期136-150,共15页
Vibration signal is an important prerequisite for mechanical fault detection. However, early stage defect of rotating machiner- ies is difficult to identify because their incipient energy is interfered with background... Vibration signal is an important prerequisite for mechanical fault detection. However, early stage defect of rotating machiner- ies is difficult to identify because their incipient energy is interfered with background noises. Multiwavelet is a powerful tool used to conduct non-stationary fault feature extraction. However, the existing predetermined multiwavelet bases are independ- ent of the dynamic response signals. In this paper, a constructing technique of vibration data-driven maximal-overlap adaptive multiwavelet (MOAMW) is proposed for enhancing the extracting performance of fault symptom. It is able to derive an opti- mal multiwavelet basis that best matches the critical non-stationary and transient fault signatures via genetic algorithm. In this technique, two-scale similarity transform (TST) and symmetric lifting (SymLift) scheme are combined to gain high designing freedom for matching the critical faulty vibration contents in vibration signals based on the maximal fitness objective. TST and SymLift can add modifications to the initial multiwavelet by changing the approximation order and vanishing moment of mul- tiwavelet, respectively. Moreover, the beneficial feature of the MOAWM lies in that the maximal-overlap filterbank structure can enhance the periodic and transient characteristics of the sensor signals and preserve the time and frequency analyzing res- olution during the decomposition process. The effectiveness of the proposed technique is validated via a numerical simulation as well as a rolling element beating with an outer race scrape and a gearbox with rub fault. 展开更多
关键词 fault diagnosis maximal-overlap adaptive multiwavelet two-scale similarity transform symmetric lifting rotating machineries
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