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- Keywords Fault signal;Feature analysis;Instantaneous Frequency;Poincare map;Topology contravariant;Signal analysis; 故障信号;特征分析;瞬时频率;庞加来映射;拓扑反变;信号分析;
- At present, transient fault signal of HV/EHV transmission line is analyzed by wavelet transform. 目前国内主要是采用小波变换的方法分析高压输电线路故障后的暂态信号。
- In this paper,a new method of motor fault signal frequency pursuitting based on marginal spectrum of Hilbert-Huang transform(HHT) was presented. 提出了将HHT变换(Hilbert-HuangTransform,简称HHT)中边际谱应用于电机故障信号频率跟踪研究的新方法。
- The amounts of fault signal records are increasing rapidly with the elevation of fault monitoring level, which leads to troubles for data transmission and storage, therefore the research of data compression is paid more and more attention. 摘要随着对电力系统故障过程监控水平要求的逐步提高，急剧增大的故障录波器数据量给数据传输和储存带来了很大的困难，因此数据压缩也越来越受到人们的关注。
- In chapter 1, Firstly, fault feature extraction methods and their characteristics in FDD are introduced briefly, research progress, existing problems and application prospects on the fault signal processing with wavelet are stated in detail. 第一章概述了故障检测与诊断技术中故障特征提取方法的研究进展、存在问题及应用前景。
- By digital simulation and detection of gearbox fault signal the detection effect of the novel bilinear time-frequency transform is validated for the transient components in complex signal. 通过数字模拟实验与齿轮箱故障信号检测，验证了新的双线性时间－频率分布对复杂信号中瞬时分量的探测效果。
- The proposed scheme directly reconstructs the fault signal rather than obtaining it by generating and evaluating the residual signals. 该方法能够直接重构故障信息而不是通过产生和评价残差信号得到故障信息，从而避免了产生和评价残差信号的复杂性。
- Keywords fault;batholith;Fenghuangshan ore field; 断裂;岩基;凤凰山矿田;
- Weak periodical fault signals can be extracted successfully from the background of QT. 本文以类随机电报为背景,成功地提取了弱周期性故障信号;
- Because neural networks have a very strong ability in pattern recognition, an NN classifier is used in the multi-parameter recognition of fault signals. 充分利用了神经网络极强的模式分类能力，用神经网分类器对故障信号进行多参量识别。
- First the power spectrum of fault signals is decomposed by wavelet analysis, which predigests choosing method of fault eigenvectors. 首先对故障信号功率谱进行小波分解,简化了故障特征向量的提取。
- Solutions of substation general fault signal 变电站监控系统事故总信号解决方案探讨
- Keywords fault;elas-plastics;joint;shaft coal column; 断层;弹塑性;节理;井筒煤柱;
- A brief review of bispectrum is presented, while mos t emphasis is placed on the ability of bispectrum to suppress noise and extract diagnostic information from fault signals. 分析双谱的性质和物理意义，探讨双谱抑制噪声和提取故障信息的能力。
- The improved function is applied to noise reduction of wire rope fault signals, and its effect is compared with that of the traditional multiwave threshold function. 将其应用于钢丝绳缺陷信号的降噪中，与传统多小波阈值函数的降噪进行了比较。
- Keywords fault;source of ore;mixed fluid;hypabyssal vein rock; 断裂;矿源;混合流体;浅成脉岩;
- Through analysis and study on vibration data of normal state and abnormal state,the thesis distinguishes the fault signals from normal signals and finds the identification method. 通过对正常状态和故障状态时振动筛的振动数据分别进行分析研究,对故障信号予以辨识,找出了相应的辨识方法。
- Combined with analysis of fault signals, the paper applies EMD, Singular Value analysis, SVM and Shannon entropy to the extraction and analysis of transient signals. 结合对故障信号的分析,将EMD、奇异值分析、SVM、信息熵等应用到选相过程中暂态信号的提取和分析上。
- Keywords Fault Tree;RH KTB;Vacuum system;Fault diagnosis; 故障树;真空系统;故障诊断;
- Because complex wavelet transforms can exactly identify amplitude and phase information in signal to be dealt with,they are suitable for detection of fault signals in power system. 复值小波变换能准确分辨出信号中所包含的幅值信息和相位信息，因而，适用于电力系统的故障信号的检测。
