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Description: 对Gabor时频变换在模态参数辨识中的应用进行了探讨,将基于Gabor系数展开的时频滤波方法作为参数辨识的前处理手段之一,该方法对于平稳、非平稳信号都适用。根据信号在时频域内的分布特征,可以直接观测系统的频率分布情况、模态密集程度、能量聚集性、各通道响应信号所含特征量的多少等信息,从而对响应信号的特征构成进行初步判断,并通过剔除、截取等操作实现对响应信号的滤波,更有利于模态参数的辨识。
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Size: 487032 |
Author: yangqing2005 |
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Description: ：简介了研制的随机振动信号处理虚拟仪器系统的组成。叙述了其中的抗混滤波器的作用与要
求，并在分析8 阶低通椭圆开关电容滤波器（MAX293 ）性能的基础上，研制了基于MAX293 的抗混滤
波器。尤其对遇到的“共振”现象作出了理论分析及实验验证，同时给出了解决方法。该抗混滤波器具
有电路简单、变带宽方便、过渡带衰减迅速等优点-The composition of the developed virtual instrument system of processing a random
vibration signal is introduced. The action and demand of the anti alias filter in the system are
recounted. After analyzing the 8-order low pass elliptic switched capacitor filter (MAX293), the anti
alias filter is developed based on it. Specifically, the“ resonance”phenomenon is analyzed theoretically
and the analysis is proved by the experiment. The“ resonance”is avoided. The anti
alias filter has the performance of the circuit being simple, the change of the pass band convenient,
and the attenuation of the transition band sharp
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Size: 48128 |
Author: 张雨 |
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Description: 传统的波形发生器采用模拟技术的方法，这种方法构成的波形发生器电路结构复杂，仅能产生正弦波、方波、锯齿波和三角波等几种简单波形。而现在在高科技领域，我们需要的可能是一些任意波形，如在保密雷达发波等军事方面和地震波形、汽车碰撞波形等模拟仿真应用方面。任意波形发生器现在被广泛用于自动控制系统、振动激励、仪器仪表领域。我国目前在这方面还比较落后，特别是在用DDS技术实现任意波形发生器方面。本课题我们打算用DDS技术基于FPGA核心板设计一个任意波形发生器。该仪器我们用LabVIEW来写的控制面板实现与FPGA的通信，实现任意波形数据的采集，并具有良好的人机交互界面。用液晶显示屏显示波形的幅度和频率。用4×4键盘控制相关波形的输出。用AD和低通滤波电路实现数电到模电的转换-The traditional waveform generator adopts the method of simulation technology, this kind of method constitute the waveform generator circuit structure is complex, can only produce sine and square-wave, sawtooth wave and triangular several simple waveform. And now in the high-tech fields, we may need some arbitrary waveform is, as in LeiDaFa confidential military aspects and seismic waves, automobile collisions wave wave simulation application. Arbitrary waveform generator is now widely used in automatic control system, vibration, instruments field. At present in this respect, especially in still lag behind with arbitrary waveform generator DDS technology. This task we intend to use DDS technology based on FPGA core board design an arbitrary waveform generator. The instrument to write with LabVIEW, we realize the control panel and FPGA communication, realizing arbitrary waveform data acquisition, and has good human-machine interface. With LCD display wave amplitude and frequency. Use 4
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Size: 532480 |
Author: zhangying |
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Description: MATLAB是一种用于科学工程计算的高效率高级语言。MATLAB的基本数据单位是矩阵，它的工具箱已经延伸到了科学研究和工程应用的许多领域。它在诸如一般数值计算、数字信息处理、系统识别、自动控制、振动理论、时序分析与建模、优化设计、神经网络控制、动态仿真系统、金融管理、小波分析、特殊函数和图形领域表现出一般高级语言难以相比的优势，并可以方便地用于几乎所有的科学和工程计算的各方面。-MATLAB is a science and engineering computing for efficient high-level language. MATLAB' s basic data unit is the matrix, and its toolbox has been extended to scientific research and engineering applications in many fields. It is in such general numerical calculation, digital information processing, system identification, automatic control, vibration theory, time series analysis and modeling to optimize design, neural network control, dynamic simulation system, financial management, analysis, special functions and graphics in the field show generally difficult to match the advantages of high-level language, and can be easily used in almost all scientific and engineering computing aspects.
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Size: 49152 |
Author: 杨小林 |
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Description: 机械波演示，质点振动方向与波的传播方向垂直。-Mechanical wave demonstration, particle vibration direction perpendicular to the direction of wave propagation.
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Size: 2048 |
Author: cax |
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Description: 基于FFT的功率谱分析程序设计与应用
2）对实验所采集的转子振动信号进行频谱分析
2．讨论：
1) 信号经过均值化处理或不经过均值化处理的结果比较
2）采用不同窗函数时的谱结果（矩形窗函数, 汉宁窗函数，汉明窗）
3）典型函数的频谱（矩形窗函数, 汉宁窗函数，直线，阶跃函数，δ函数，方波，三角波等）
4）整周期和非整周期采样时两者的比较
5）讨论实验结果
-Based on the FFT power spectrum analysis of program design and Application2) on experimental collection of the rotor vibration signal spectrum analysis2 discussion:1) the signal through the mean treatment or not after a mean treatment results comparison2) using different window function spectral results ( rectangle window, Hanning window function, the Hamming window )3) the typical functions of spectrum ( rectangle window, Hanning window function, linear, step function, function, square wave, triangular wave)4) the whole cycle and non-integer-period sampling time comparison5) discussion of experimental results
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Size: 121856 |
Author: xdh |
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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: 提出一种基于小波分析和奇异谱降噪理论的新方法, 在分析滚动轴承故障特性的基础上, 将奇异谱理论的降噪方法与小波分析理论结合应用于滚动轴承故障诊断中。实例表明,这种结合后的新方法能够更有效地降低噪声,突出振动信号的故障特性, 从而提高设备故障诊断的准确率。-Proposed based on wavelet analysis and Singular Spectrum Reduction Noise Theory new methods in the analysis of rolling bearing fault characteristics, based on the theory of singular spectrum noise reduction method combined with wavelet analysis theory applied to fault diagnosis of rolling. Examples show that the new method can be combined to more effectively reduce noise, vibration signal failure prominent characteristic, thereby improving the accuracy of fault diagnosis.
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Size: 173056 |
Author: 张力 |
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Description: 小波与近似熵相结合的机械振动噪声信号分析
1 近似熵算法：
2 快速近似熵算法：
3 复morlet小波实验程序：
4谐波小波实部与虚部的程序：
5谐波小波分析时频图：
-Harmonic wavelet combined with approximate entropy mechanical vibration and noise signal analysis
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Size: 3072 |
Author: zhao hf |
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Description: 小波与近似熵相结合的机械振动噪声信号分析
7近似熵实验程序-Wavelet combined with approximate entropy mechanical vibration and noise signal analysis
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Size: 1024 |
Author: zhao hf |
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Description: 小波与近似熵相结合的机械振动噪声信号分析
8.复morlet小波实验程序.-8 Complex Wavelet morlet experimental procedures.
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Size: 1024 |
Author: zhao hf |
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Description: 针对滚动轴承故障信号具有非平稳、非高斯的特点，提出了将时域分析与小波分析相结合的方法对滚动轴承进行故障诊断。在研究不同信号分析方法理论的基础上，以滚动轴承外圈故障振动信号为例，采用多种信号处理方法进行了分析。结果表明，各种分析方法在分析轴承故障时的特点各不相同，在实际使用中，可将时域分析与小波分析综合使用，实现轴承状态的实时监测与故障的准确定位。-For rolling bearing fault signals have non-stationary, non-Gaussian, we proposed the time-domain analysis and wavelet analysis method of combining the rolling element bearing fault diagnosis. In the study of different analytical methods based on the theory of signal to the outer ring rolling bearing fault vibration signal, for example, using a variety of signal processing methods are analyzed. The results show that a variety of analytical methods in the analysis of the characteristics of bearing failure vary, in actual use, can be time-domain analysis and synthesis using wavelet analysis, to achieve accurate positioning of the bearing condition monitoring and real-time fault.
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Size: 1024 |
Author: 刘良博 |
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Description: 小波包分析提取振动信号中的特征频率，基于欧几里得距离的聚类分析，插值与拟合，解方程，数据分析。- Wavelet packet analysis to extract vibration signal characteristic frequency, Clustering analysis based on Euclidean distance, Interpolation and fitting, solution of equations, data analysis.
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Size: 6144 |
Author: 靳荔斌 |
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Description: 小波包分析提取振动信号中的特征频率，语音信号的采集与处理，数字信号处理课设，已经调试成功.内含m文件，可直接运行。- Wavelet packet analysis to extract vibration signal characteristic frequency, Acquisition and Processing of the speech signal, digital signal processing class-based, Has been successful debugging. M contains files can be directly run.
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Size: 7168 |
Author: nei |
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Description: 遗传算法无功优化，小波包分析提取振动信号中的特征频率，插值与拟合的matlab实现。- Genetic algorithm based reactive power optimization, Wavelet packet analysis to extract vibration signal characteristic frequency, Interpolation and fitting matlab implementation.
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Size: 10240 |
Author: ynyqh |
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Description: 小波包分析提取振动信号中的特征频率，关于小波的matlab复合分析，BP神经网络用于函数拟合与模式识别。- Wavelet packet analysis to extract vibration signal characteristic frequency, Matlab wavelet analysis on complex, BP neural network function fitting and pattern recognition.
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Size: 5120 |
Author: fei |
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Description: 针对滚动轴承这种非平稳振动信号采用的小波包分解的方法来检测故障的存在，运用神经网络来实现故障的分类，还结合D-S理论融合了多个传感器的诊断结果，提高了故障诊断的准确性并通过实验仿真证实。(This course's job is to use the wavelet packet decomposition method for non-stationary vibration signals of rolling bearings to detect the presence of faults and to use nerves. The network is used to classify faults, and the DS results are combined with the diagnostic results of multiple sensors to improve the accuracy of fault diagnosis and confirm it through experimental simulation.)
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Size: 334848 |
Author: changshen_xu |
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