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Description: 小波变换在故障诊断中的应用 441
18.1 引言 441
18.2 基本原理 442
18.3 小波变换在轴承故障诊断中的应用 444
18.3.1 轴承外环故障诊断 444
18.3.2 轴承滚动体故障诊断 448
18.4 小波变换在齿轮故障诊断中的应用 450
18.5 小波包在轴承故障诊断中的应用 452
18.5.1 轴承外环故障诊断 453
18.5.2 轴承滚动体故障诊断 454-wavelet transform fault diagnosis of Introduction 441 18.1 441 18.2 442 basic tenets 18.3 wavelet transform bearing fault diagnosis of 444 18.3.1 ring bearing 444 1 Fault Diagnosis 8.3.2 rolling bearings Fault Diagnosis 448 18.4 wavelet transform in Gear Fault Diagnosis of 450 1 8.5 wavelet packet bearing fault in the diagnosis of 452 18.5.1 ring bearing fault diagnosis 453 18. 5.2 roller bearings Fault Diagnosis 454
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Size: 1024 |
Author: 崔鹏 |
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Description: helical gear. it solution of helical gear problem
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Size: 60416 |
Author: Kannan |
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Description: 小波分析在交通领域的应用（汽车变速器轴承故障诊断、变速器齿轮故障诊断和车辆非平稳振动分析）-Wavelet analysis in the application of the traffic (auto transmission bearing fault diagnosis, transmission gear fault diagnosis and vehicle the nonstationary vibration analysis)
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Size: 4096 |
Author: renshuai |
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Description: 機電整合、半導體上課講義
內含振動學原理、齒輪設計等機電基礎
半導體上課講義則說明pn接面、擴散、飄移等, 半導體元件特性-The mechanical and electrical integration, semiconductor class handouts containing vibration theory, the gear design, electrical and mechanical basis of semiconductor class handouts to explain the characteristics of pn junction, diffusion, drift and other semiconductor components
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Size: 41687040 |
Author: ming-che |
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Description: 本文研究了齿轮振动信号调制与解调的过程与机理。并根据希尔伯特变换理论,提出了一种早期诊断齿轮故障的新方法-In this paper, a gear vibration signal modulation and demodulation process and mechanism. Hilbert transform theory, proposed an early diagnosis of gear failure method
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Size: 372736 |
Author: 张力 |
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Description: 阐述Hilbert变换的定义及解调原理。工程应用的结果表明, 利用Hilbert技术从复杂的
振动信号中解调故障的调制信息, 进而判断出故障齿轮的部位, 是一种可靠的故障诊断方法-On the definition of the Hilbert transform demodulation principle. The engineering application results show that the Hilbert technical failure of modulation information from complex vibration signal demodulation, and then identify the parts of the fault gear, is a reliable method of fault diagnosis
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Size: 156672 |
Author: 张力 |
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Description: 齿轮发生裂纹故障时其振动信号会产生调制现象,包括幅值调制和频率(相位)调制两部分。目前调幅信号的解调分析已经比较成熟,但对于调频信号的解调方法研究还不够完善。全面系统介绍了近年来处理调频信号
中最常用的希尔伯特相位解调和循环平稳解调两种方法-Gear crack fault occurs when the vibration signal will produce modulation phenomenon, including the two parts of the modulation of the amplitude modulation and frequency (phase). AM signal demodulation analysis is relatively mature, but still not perfect FM signal demodulation method. The comprehensive system introduced in recent years dealing with the FM signal most common Hilbert phase demodulation and cyclostationary two methods
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Size: 1217536 |
Author: 张力 |
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Description: Features and Benefits
▪ Optimized robustness against magnetic offset variation
▪ Small signal lockout for immunity against vibration
▪ Tight duty cycle and timing accuracy over full operating
temperature range
▪ True zero-speed operation
▪ Air gap independent switchpoints
▪ Large operating air gaps achieved through use of gain
adjust and offset adjust circuitry
▪ Defined power-on state (POS)
▪ Wide operating voltage range
▪ Digital output representing target profile
▪ Single chip sensing IC for high reliability
▪ Small mechanical size
▪ Optimized Hall IC magnetic system
▪ Fast start-up
▪ Undervoltage lockout (UVLO)
True Zero-Speed, High Accuracy Gear Tooth Sensor IC
Functional Block Diagram
ATS667LSG
Not to scale
Package: 4-pin SIP (suffix SG)-Features and Benefits ▪ Optimized robustness against magnetic offset variation ▪ Small signal lockout for immunity against vibration ▪ Tight duty cycle and timing accuracy over full operating temperature range ▪ True zero-speed operation ▪ Air gap independent switchpoints ▪ Large operating air gaps achieved through use of gain adjust and offset adjust circuitry ▪ Defined power-on state (POS) ▪ Wide operating voltage range ▪ Digital output representing target profile ▪ Single chip sensing IC for high reliability ▪ Small mechanical size ▪ Optimized Hall IC magnetic system ▪ Fast start-up ▪ Undervoltage lockout (UVLO) True Zero-Speed, High Accuracy Gear Tooth Sensor IC Functional Block Diagram ATS667LSG Not to scale Package: 4-pin SIP (suffix SG)
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Size: 413696 |
Author: 古峰 |
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Description: 提出了将信号进行相空间重构后再采用奇异值分解, 对分解后的主成分进行包络分析, 从而提取信号的隐含特
征的方法, 并将该方法应用于齿轮的局部故障振动特征信号的提取中。数值仿真实验结果表明, 该方法能有效提取强背景
信号及噪声中的弱冲击特征信号, 是一种有效的弱信号特征提取方法。采用该方法对齿轮振动信号进行故障特征提取与识
别, 结果与实际情况相符。-Signal implicit characteristic of phase space reconstruction, and then using the singular value decomposition (SVD), principal component decomposition envelopment analysis, so as to extract the signal, and the method is applied to the partial failure of the vibration characteristics of the signal of the gear extraction. The numerical simulation results show that this method can effectively extract Weak Feature strong background signal and noise in the signal, a weak signal feature extraction methods. The extraction and recognition of fault feature of gear vibration signal results consistent with the actual situation.
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Size: 278528 |
Author: 张力 |
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Description: 针对齿轮箱振动信号的非平稳性和非线性, 提出一种多重分形和支持向量机相结合的故障
诊断方法。运用多重分形理论方法对齿轮振动信号进行分析, 通过分析发现多重分形谱和广义维数作
为故障特征能够很好地反映齿轮箱的工作状态 对支持向量机的参数利用粒子群优化算法进行优化, 并
将齿轮箱振动信号的多重分形特征量作为支持向量机的输入参数以识别齿轮的故障类型。实验结果表明, 该方法在样本较小的情况下能够准确对齿轮箱的故障类型进行分类-Gearbox vibration signal of non-stationary and non-linear, the combination of a multifractal support vector machine fault diagnosis method. The use of multiple fractal theory methods to analyze gear vibration signals, through the analysis found multifractal spectrum and broad-dimensional number as the fault feature able to well reflect gearbox work state support vector machine parameters utilize particle swarm optimization algorithm to optimize and the multifractal characteristic quantities of the gearbox vibration signal as the input parameters of support vector machine to identify the type of gear failure. Experimental results show that the method in the case of a smaller sample can be accurately classify the type of failure of the gear box
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Size: 177152 |
Author: 张力 |
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Description: 针对齿轮滚动轴承等的早期损伤类故障, 提出将小波包分解作为包络分析的前置处理手段以提取振动信号的故障信息特征 。 在简述小波包基本原理的基础上, 通过仿真信号, 对振动信号的具体处理过程进行分析, 并对可能遇到的问题, 提出处理办法, 然后应用于诊断实例 。 -Early damage fault for rolling bearings and other gear, the proposed wavelet packet decomposition as pre-processing means envelopment analysis to extract characteristic vibration signal fault information. On the basis of the basic principles outlined wavelet packet, through simulation signal processing for specific vibration signals are analyzed, and the problems that may be ncountered, proposed approach, and then applied to the diagnosis example.
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Size: 384000 |
Author: 张力 |
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Description: 使用模糊自适应主动控制飞机起落架振动阻尼的研究-Using fuzzy adaptive active control landing gear vibration damping research
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Size: 636928 |
Author: yupeng |
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Description: Vibration modes of planetary gears with unequally spaced planets
and an elastic ring gear
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Size: 316416 |
Author: DUC |
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Description: 齿轮传动非线性分析，对扭转振动方程组进行求解，可得到齿轮扭转角随时间变化相关参数-Gear nonlinear analysis of torsional vibration equations are solved to obtain the twist angle of the gear change parameters over time
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Size: 1024 |
Author: 朱宇杰 |
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Description: 小波变换进行变速箱故障诊断
首先将s1和s2信号时域谱（s1代表维修前的振动信号，s2代表维修后的振动信号），画出来进行对比，会发现s1信号的振动幅值会比较高；然后对s1和s2分别进行小波分解并画出各层的时域谱，只对比s1和s2分后的最高时域谱，s2更加的具有周期性，且幅值较小，s2周期性不够明显，且振动过于密集。分析完时域谱后开始分析频谱，首先对原信号s1和s2fft转换，得到频谱图，如图，然后再对小波分析后高频部分进行fft转换，做出频谱图。对比后我们发现，在f 2375HZ出（也就是齿轮的啮合频率），s1信号频谱幅值会有急剧的升高，然后，其谐波的幅值也会增大。所以可以推断出该维修前的增速箱的齿轮可能出现问题。-Gearbox fault diagnosis based on wavelet transform s1 and s2 first time domain signal spectrum (s1 behalf of the vibration signal before maintenance, vibration signal s2 representative of repaired), drawn comparison, you will find a signal s1 vibration amplitude will be higher then s1 and s2 respectively wavelet decomposition and draw the layers of time-domain spectrum to only a maximum time domain spectroscopy s1 and s2 points after, s2 is more cyclical and smaller magnitude, s2 cyclical enough obviously, and the vibration is too dense. End domain spectral analysis after the beginning of the spectrum analysis, the first of the original signal s1 and s2fft conversion to give the spectrum, as shown, and then after the high frequency part of wavelet analysis fft transformation to make spectrum. We found that after the comparison, at f 2375HZ out (i.e. the gear mesh frequency), there will be a sharp increase in the amplitude spectrum of the signal s1, and then, the amplitude of the ha
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Size: 2048 |
Author: lililili |
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Description: 通过在齿轮中添加颗粒阻尼器 利用阻尼作用 来减小齿轮振动(Reducing the gear vibration by adding the particle dampers in the gear to use the damping effect)
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Size: 9216 |
Author: 林文文 |
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Description: 介绍了对一个复杂结构—斜齿圆柱齿轮模型的创建方法，以及利用ANSYS对其进行固有频率和振型研究即模态分析的方法、步骤和过程。(This paper introduces a method for creating a complex structure - a helical gear model, and the method, procedure and process of the modal analysis of its natural frequency and mode of vibration using ANSYS.)
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Size: 12288 |
Author: 糖 糖 |
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Description: 行星齿轮变成计算，扭振模型，18个自由度(The planet gear becomes the computation, the torsional vibration model.)
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Size: 1024 |
Author: rick5799 |
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Description: 以齿轮系统动力学和非线性动力学理论为基础,针对齿轮系统时变啮合刚度和齿侧间隙耦合作用的具体特点,建立了齿轮系统非线性模型,并用数值积分和数值仿真方法对其在某些参数域中进行了非线性振动研究(Based on the dynamics of a gear system and the theory of nonlinear dynamics, co nsidering characteristics of coupling action of the time-varying mesh stiffness and the gear backlash, a model of the nonlinear gear system is developed. The nonlinear vibration is studied by using numerical integration method and numerical simulation in some parameter fields.)
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Size: 1024 |
Author: 白天1234 |
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Description: 两级行星齿轮传动的微分方程，以扭振模态计算(The differential equation of two-stage planetary gear transmission is calculated by torsional vibration mode)
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Size: 3072 |
Author: ww13588703841 |
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