Results 31 to 40 of about 3,326 (152)
Vondrak滤波法用于结构振动与GPS多路径信号的分离 [PDF]
, 2015 Author name used in this publication: 钟萍Author name used in this publication: 丁晓利, DING Xiao-liAuthor name used in this publication: 郑大伟Author name used in this publication: 陈武Title in Traditional Chinese: Vondrak 濾波法用於結構振動與GPS多路徑信號的分離Journal title in ...
Chen, W, Ding, XL, Zheng, DW, Zhong, P
core
An Localization and Classification Recognition Technology of DAS Signal based on Classifier Confidence [PDF]
【Objective】In order to solve the problems of low events recognition rate and weak positioning accuracy in distributed fiber vibration sensor system, a pattern recognition algorithm based on classifier confidence distribution of adjacent sensor nodes is ...
CAI Chao +8 more
core +1 more source
Fault diagnosis of ship motor bearings based on multi-domain information fusion and improved ELM [PDF]
ObjectivesAiming at the problems that the symptom parameters from monitoring signals in a single analysis domain fail to fully characterize the operating state of the monitored object, and the model parameters of the Extreme Learning Machine (ELM ...
Chun GE +3 more
core +1 more source
, 2019 针对强相干噪声干扰下叶片振动信号中裂纹故障微弱特征的提取问题,提出了一种基于稀疏共振解调的诊断方法。首先,利用从中心集化多分辨分析处理机组上取得的原始振动信号进行子空间重构;其次,对小波子空间信号进行希尔伯特包络解调,选取故障特征频率及其倍频成分能量占优的子空间;再次,根据周期性故障稀疏模型,采用梳形滤波器分离故障特征频率及其倍频成分,构造故障分量参考信号;最后,结合故障参考信号对子空间重构信号进行小波降噪,从而提取与叶片裂纹相关的微弱特征。在出现叶片裂纹故障的发电机组增压风机故障诊断案例分析中 ...
李诚 +4 more
core +4 more sources
Gaoya dianqi, 2010 提出一种基于小波-包络谱能量提取振动信号特征并进行故障诊断的新方法。首先应用小波分析对振动信号进行降噪处理,然后与希尔伯特变换相结合,提取振动信号的低频和高频包络,最后对包络信号进行谱分析及能量特征提取。实验结果表明,该方法对提取高压真空断路器机械振动信号的特征是有效的,可为故障诊断提供依据。
赵洋, 刘汉宇, 曾庆军
doaj
Imprints of vibratory signals induced by road construction in strain and seismic records: A case study of Yichang station [PDF]
One of the crucial issues in the field of earthquake forecasting and prediction is the reasonable identification of the tilt, strain, and seismic signals induced by road construction.
Xiaolin Yang
core +1 more source
Gaoya dianqi, 1999 提出和研究了基于振动信号多阈值幅值显示的GIS击穿定位技术.对GIS内部击穿所产生的振动信号的幅值进行多阈值比较和显示,可以更多地提供有关振动信号传播衰减的信息 ...
姜秀峰, 刘卫东, 钱家骊
doaj
Gaoya dianqi, 2020 为进一步提高变压器机械故障智能诊断的准确性,文中基于变压器振动信号时间序列符号化的模式表征,提出了一种基于栈式自编码器的变压器机械故障诊断模型。首先对振动信号时间序列进行符号化模式表征和构建复杂网络,提取了基于度分布的变压器振动信号特征向量,据此构建了基于栈式自编码器（stacked auto encoder,SAE）的变压器机械故障诊断模型。对某10 k V干式变压器正常与典型机械故障下振动信号的分析结果表明,变压器振动信号时间序列的符号化模式表征及度分布能较好地表征其动力学特征 ...
解颖, 王丰华, 傅正财
doaj
Research on Safety Early Warning Method of Operational Bridge Structure Based on Cross-Correlation Function Analysis [PDF]
, 2017 运营桥梁结构的安全预警系统能对其安全状况进行实时在线监测，并及时反馈给相应的管理部门，以便于及时采取处理措施。结构损伤识别方法是结构安全预警系统的核心，国内外学者对这一课题已开展了广泛的研究，并取得了丰硕成果。然而，现有的研究方法大多是基于先验结果的数值模拟和实验分析，在实际工程的应用中，存在着严重的适用性问题及其他诸多不同于实验和数值模拟的难点。因此，针对在役桥梁在环境随机振动下的结构损伤判别方法成为新交通环境下众多既有桥梁结构安全性问题研究的切实需求。 本文以随机振动下桥梁结构的监测数据为基础 ...
赵大伟
core