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Description: 这里提供了两个消除趋势相的matlab程序
在故障诊断中 要对信号进行频谱分析 而在频谱分析前要消除趋势相 这样得到的频谱 能更好的反映故障 有利于进一步诊断-Here are two trends in the elimination phase of the matlab program in fault diagnosis to the signal spectrum analysis and spectrum analysis in the former to eliminate the tendency of such spectrum can be better reflected further in favor of fault diagnosis
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Author: 熊健 |
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Description: 从这篇文章中可以获得在什么时间点划分动脉期，图片清晰，对小肝癌的诊断有一定帮助-This article, from what point in time can be divided in the arterial phase, a clear picture, the diagnosis of small hepatocellular carcinoma have some help
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Size: 1488896 |
Author: sage |
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Description: 在心电信号的采集过程中，会引入各种干扰噪声，如基线漂移。为了得到不失真的心电信号，在诊断分析前要对信号进行预处理---数字滤波。
FIR滤波器容易实现线性相位。对于相位要求严格的场合，要求用FIR滤波器实现滤波，实验要求用用FIR高通滤波器法去除其中基线漂移。
-ECG acquisition process, will introduce all kinds of interference noise, such as baseline drift. In order to get undistorted ECG in the diagnosis of pre-process the signal before--- digital filter. Linear phase FIR filter is easy to implement. For the phase-critical occasions, asked to use FIR Filter filter, test requirements with a high-pass filter with the FIR in which baseline drift removal.
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Size: 171008 |
Author: yujing |
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Description: Electrical tractions use more and more the asynchronous machines because of their
robustness, their power weight ratio. Their maintenance as well as their diagnosis then became an economic state. It is important to early detect the faults likely to appear in those motors and therefor to implement a preventive maintenance.
Thus, a detailed model of the machine was developed in order to analyse the impact of
those faults on the machine performance. We could then get specific signatures for electrical faults and foresee their evolution.
Our approach is based on keeping a close watch over parameters of the performance model of the machine particularly sensitive to faults: The rotor resistances of three phase model, the
magnetising inductance and the rotoric resistance of a two phase model.
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Size: 1227776 |
Author: lakhdar |
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Description: 本程序为基于多回路理论的单相异步电机故障诊断程序，具有良好的效果-This program is based on multi-loop theory for single phase induction motor fault diagnosis procedures, with good results
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Size: 2048 |
Author: 钱雅云 |
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Description: TMS320F2812的移相电容器故障诊断装置的设计-TMS320F2812 phase shift capacitor design of fault diagnosis device
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Size: 389120 |
Author: keek66 |
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Description: 小波分析诞生于20世纪80年代, 被认为是调和分析即现代Fourier分析发展的一个崭新阶段。众多高新技术以数学为基础,而小波分析被誉为“数学显微镜”,这就决定了它在高科技研究领域重要的地位。目前, 它在模式识别、图像处理、语音处理、故障诊断、地球物理勘探、分形理论、空气动力学与流体力学上的应用都得到了广泛深入的研究,甚至在金融、证券、股票等社会科学方面都有小波分析的应用研究-Wavelet analysis was born in the 1980s, is considered the modern harmonic analysis and Fourier analysis is the development of a new phase. Mathematical basis of many high-tech, and wavelet analysis as the " mathematical microscope" , which determines its high-tech research in an important position. Currently, it is pattern recognition, image processing, speech processing, fault diagnosis, geophysical exploration, fractal theory, aerodynamics and fluid mechanics have been applied on extensive research, even in the financial, securities, stocks and other social sciences aspects of the application of wavelet analysis
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Size: 51506176 |
Author: zhouxiaolin |
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Description: 提出了一种基于复解析小波变换的相位诊断齿轮故障的方法。复解析小波变换将Hilbert变换与小波分析紧密结合在一起,具有自适应分析能力。利用复解析小波变换得到齿轮振动信号的相位,其功率谱图上可提取调制边频带结构来识别故障模式。试验结果表明这种方法可有效应用于齿轮局部故障诊断中。-A new method using the phase based on complex analytical wavelet transform for fault diagnosis of gears was proposed. The phase of vibration signals of gears is got by complex analytical wavelet transform, which combines Hilbert transform with wavelet transform tightly and possesses adaptive analysis ability. By making spectrum analysis of the phase, the sideband structure in power spectrum can be protruded, and the fault pattern can be identified. Experimental results show that the proposed method is effective in local defect detection of gears.
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Size: 19456 |
Author: whb |
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Description: 提出了一种基于复解析小波变换的相位诊断齿轮故障的方法。复解析小波变换将Hilbert变换与小波分析紧密结合在一起,具有自适应分析能力。利用复解析小波变换得到齿轮振动信号的相位,其功率谱图上可提取调制边频带结构来识别故障模式。试验结果表明这种方法可有效应用于齿轮局部故障诊断中。-A new method using the phase based on complex analytical wavelet transform for fault diagnosis of gears was proposed. The phase of vibration signals of gears is got by complex analytical wavelet transform, which combines Hilbert transform with wavelet transform tightly and possesses adaptive analysis ability. By making spectrum analysis of the phase, the sideband structure in power spectrum can be protruded, and the fault pattern can be identified. Experimental results show that the proposed method is effective in local defect detection of gears.
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Size: 30720 |
Author: whb |
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Description: 复解析小波变换将Hilbert变换与小波分析紧密结合在一起,具有自适应分析能力。利用复解析小波变换得到齿轮振动信号的相位,其功率谱图上可提取调制边频带结构来识别故障模式。试验结果表明这种方法可有效应用于齿轮局部故障诊断中。-A new method using the phase based on complex analytical wavelet transform for fault diagnosis of gears was proposed. The phase of vibration signals of gears is got by complex analytical wavelet transform, which combines Hilbert transform with wavelet transform tightly and possesses adaptive analysis ability. By making spectrum analysis of the phase, the sideband structure in power spectrum can be protruded, and the fault pattern can be identified. Experimental results show that the proposed method is effective in local defect detection of gears.
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Size: 20480 |
Author: whb |
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Description: 提出了一种基于复解析小波变换的相位诊断齿轮故障的方法。复解析小波变换将Hilbert变换与小波分析紧密结合在一起,具有自适应分析能力。利用复解析小波变换得到齿轮振动信号的相位,其功率谱图上可提取调制边频带结构来识别故障模式。试验结果表明这种方法可有效应用于齿轮局部故障诊断中。-A new method using the phase based on complex analytical wavelet transform for fault diagnosis of gears was proposed. The phase of vibration signals of gears is got by complex analytical wavelet transform, which combines Hilbert transform with wavelet transform tightly and possesses adaptive analysis ability. By making spectrum analysis of the phase, the sideband structure in power spectrum can be protruded, and the fault pattern can be identified. Experimental results show that the proposed method is effective in local defect detection of gears.
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Size: 50176 |
Author: whb |
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Description: 提出了一种基于复解析小波变换的相位诊断齿轮故障的方法。复解析小波变换将Hilbert变换与小波分析紧密结合在一起,具有自适应分析能力。-A new method using the phase based on complex analytical wavelet transform for fault diagnosis of gears was proposed. The phase of vibration signals of gears is got by complex analytical wavelet transform, which combines Hilbert transform with wavelet transform tightly and possesses adaptive analysis ability.
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Size: 60416 |
Author: whb |
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Description: This paper proposes an open switch faults detection and localization algorithm for shunt three
phase active filter topology. It mainly details converter configuration and examines a simple and
reliable optimised fault diagnosis method. The con verter topology is based on classical three-leg
active power filter topology. A ne w fault diagnosis method is proposed, based on classical
currents measurements. It includes combinatory logic to analyse and validate error signals. A
Hysteresis Control is applied before and after fault detection, which avoids any controller
reconfiguration. Simulation results obtained with Matlab/Simulink/Plecs tools prove the
effectiveness of this method. -This paper proposes an open switch faults detection and localization algorithm for shunt three
phase active filter topology. It mainly details converter configuration and examines a simple and
reliable optimised fault diagnosis method. The con verter topology is based on classical three-leg
active power filter topology. A ne w fault diagnosis method is proposed, based on classical
currents measurements. It includes combinatory logic to analyse and validate error signals. A
Hysteresis Control is applied before and after fault detection, which avoids any controller
reconfiguration. Simulation results obtained with Matlab/Simulink/Plecs tools prove the
effectiveness of this method.
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Size: 314368 |
Author: nek |
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Description: 该BTN8960TA是NovalithIC™ 系列包含在一个封装中三个独立的芯片组成部分：一个P沟道
高侧MOSFET和一个n沟道低侧MOSFET一起的驱动器IC，从而形成一个集成的高
当前半桥。所有的三个芯片安装在一个公共引线框架，使用由上芯片和芯片的芯片
芯片技术。电源开关采用垂直MOS技术，以确保最佳的导通电阻。
由于p沟道高侧切换需要一个电荷泵从而消除了最小的EMI。 界面
以微控制器是由容易被集成驱动器IC哪些功能逻辑电平输入，诊断
电流检测，转换率的调整，死区时间生成和防止过热，欠压，
过流和短路。的BTN8960TA可以与其它BTN8960TA结合，以形成H桥和3-
相驱动配置。-The BTN8960TA is part of the NovalithIC™ family containing three separate chips in one package: One p-channel
highside MOSFET and one n-channel lowside MOSFET together with a driver IC, forming an integrated high
current half-bridge. All three chips are mounted on one common lead frame, using the chip on chip and chip by
chip technology. The power switches utilize vertical MOS technologies to ensure optimum on state resistance.
Due to the p-channel highside switch the need for a charge pump is eliminated thus minimizing EMI. Interfacing
to a microcontroller is made easy by the integrated driver IC which features logic level inputs, diagnosis with
current sense, slew rate adjustment, dead time generation and protection against overtemperature, undervoltage,
overcurrent and short circuit. The BTN8960TA can be combined with other BTN8960TA to form H-bridge and 3-
phase drive configurations.
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Size: 1644544 |
Author: 胜客 |
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Description: The Receiver Autonomous Integrity Monitoring
(RAIM) is used to improve positioning system safety. This paper
proposes a new RAIM approach to detect and exclude multifaults of GNSS measurements before position estimation. The
new approach uses the information filter for position estimation
and information test to faults diagnosis. This test is based on
exponential convergence of the information filter measured using
the mutual information. Results with real data of GNSS
measurements (C/A code and L1 phase) show the benefits of the
proposed approach in improving the GNSS receiver integrity
positioning.
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Size: 379904 |
Author: majk |
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Description: Learning Vector Quantization Neural Network Based External Fault
Diagnosis Model for Three Phase Induction Motor Using Current
Signature Analysis
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Size: 884736 |
Author: nimapq |
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Description: 心电图(ECG)是临床上诊断心血管疾病的重要方法。
数字滤波作为数字信号处理技术的重要组成部分，广泛应用于诸如信号分离、恢复、整形等多种场合中。为了使信号不失真及在可编程逻辑器件中容易实现，采用具有严格线性相位特性的FIR滤波器进行低通滤波（0-150Hz），用整系数梳状滤波器来去工频干扰及基线漂移,从而达到对心电信号进行预处理的目的。(Electrocardiogram (ECG) is an important method for clinical diagnosis of cardiovascular diseases.
As an important part of digital signal processing technology, digital filtering is widely applied to many occasions, such as signal separation, recovery, shaping and so on. In order to make the signal undistorted and easy to be realized in programmable logic device, the FIR filter with strict linear phase characteristics is used for low pass filtering (0-150Hz), and the entire coefficient comb filter is used to get the interference of the power frequency and the baseline drift, thus the purpose of preprocessing the ECG signal is achieved.)
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Size: 2048 |
Author: 火爆夏日 |
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