共查询到18条相似文献,搜索用时 727 毫秒
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针对数学形态学结构元素无法动态调整尺寸的问题,结合量子理论提出一种基于非线性量子比特的形态滤波方法,提升形态学的机械振动信号处理效果。分析机械信号与量子理论结合的可行性,并在此基础上构建机械振动信号的峰值波谷的量子表达形式;结合振动信号的最大值和最小值,通过数学分析提出非线性量子比特的表达式,用于表达振动信号的瞬时状态;根据振动信号邻域的关联性,分析振动信号的局部特点,建立振动信号的三量子位系统;根据机械振动信号的峰值波谷的量子表达形式,在三量子位系统的框架内,提出机械振动信号在量子概率特征下的结构元素尺寸收缩算子,并基于尺寸收缩算子实现结构元素长度的自适应调整。运用轴承故障信号进行分析,结果表明,该方法能够比传统方法更加有效地提取出故障脉冲信息。 相似文献
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针对传统形态学结构元素选择的不确定性和广义形态学结构元素间相互影响的缺点,提出一种根据局部极值步长确定形态学结构元素尺寸的方法,充分利用信号的局部信息和局部极值步长,达到自适应选取最优结构元素尺寸的效果,解决了形态学结构元素选取时存在的不足。针对数学形态学在强噪声下滤波效果不理想这一不足,构造了广义形态学差值滤波器,将其与传统形态学滤波器进行仿真对比,结果显示广义差值滤波器的降噪和故障特征提取的效果明显优于传统形态滤波器,并将其应用到滚动轴承故障信号的特征提取中,结果表明该方法能够有效的抑制噪声,明显的提取滚动轴承的故障信息特征,实现滚动轴承的故障诊断。 相似文献
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开闭-闭开组合形态滤波(Combination morphological filter,CMF)可以有效剔除振动信号中的脉冲干扰,顶帽(Top-hat,TH)变换充分反映出信号周期性的冲击特征,借鉴此两种形态算子的理论思想,提出一种新的数学形态算子——组合形态-hat变换。为准确描述形态学算子在振动检测应用中的理论依据,通过非线性滤波器频响特性的分析方法考察形态学算子的滤波性质。此外,针对数学形态算子中结构元素的尺度按经验选择的问题,采用粒子群优化算法(Particle swarm optimization,PSO)对组合形态-hat变换的结构元素尺度进行参数优化,提高数学形态算子在振动信号处理中的精确度。通过仿真信号和实测风力发电机组振动信号的分析结果表明,参数优化的组合形态-hat变换在抑制背景噪声和提取冲击特征方面具备优良的性能,并能够准确高效地识别出风力发电机组齿轮箱高速轴齿轮的磨损故障,具有一定的实际工程应用价值。 相似文献
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针对数学形态滤波器中的腐蚀算子,结合量子理论知识,提出量子权重结构元素(quantum-inspired weighting structuring element,QWSE),用于提取机械振动信号中故障信息。首先,分析多量子位系统,并建立从量子空间到实数空间的映射方法,获得QWSE的计算式。随后,根据机械振动信号的随机性计算量子权重,根据振动信号的局部特征计算QWSE的动态高度,获得生成QWSE所需的全部参量。最后,将QWSE应用于轴承运行状态分析,准确的获取了故障周期。 相似文献
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液压泵的振动信号在受到大幅度变载荷作用时将引起振动特征的变化,特别是在正弦载荷变化的作用下,将会产生幅值调制现象。采用传统的单一尺度结构元素的形态学方法对该类信号进行滤波的效果不一定理想。因此,针对正弦载荷液压泵振动信号的特点,在单尺度形态滤波分析方法的基础上,提出了兼顾形态学结构元素长度和高度尺度的多尺度形态学滤波方法。首先,以冲击特征比值和二阶原点矩作为评价指标,提出综合考虑结构元素长度和高度尺度的寻优方法,确定最优长度和高度尺度算子组合。然后,用最优尺度组合对正弦载荷模拟仿真信号和变载荷液压泵故障振动信号进行滤波处理,分析结果证实其滤波效果优于单尺度滤波方法滤波效果。 相似文献
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基于数学形态滤波的齿轮故障特征提取方法 总被引:22,自引:2,他引:22
针对齿轮故障特征的提取问题,提出一种根据信号形态特征对齿轮故障信号进行形态滤波的新方法.形态滤波是一种新的非线性滤波方式,可以有效地提取出信号的边缘轮廓以及信号的形状特征.对Lorenz信号进行不同结构元素的数学形态滤波处理,证实形态滤波对抑制信号噪声、保留信号非线性特征方面的作用.采用长度为齿轮冲击周期长度的0.6~0.8倍的扁平结构元素,对齿轮断齿故障振动信号进行形态闭运算处理,并对滤波后的信号进行频谱分析.结果表明,利用形态滤波可以从齿轮断齿信号中成功提取隐含在噪声中的冲击故障特征. 相似文献
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Yabin Dong Mingfu LiaoXiaolong Zhang Fazhan Wang 《Mechanical Systems and Signal Processing》2011,25(4):1276-1286
In order to effectively smooth noise and extract the impulse components in the vibration signals of defective rolling element bearings, a new modified morphology analytical method has been proposed. In this method, average of the closing and opening operator has been used as the morphology operator. Being the flat and zero adopted as the shape and the height of structure element (SE), respectively, the optimized length of SE is defined by a new proposed criterion (called SNR criterion). The effect of the new method is validated by both simulated impulsive signal and vibration signal of three defective rolling bearings with an outer, an inner and a rolling element faults and compared with Nikolaou’s method. The result shows that the proposed method has the superior performance in extracting impulsive characteristics of vibration signals, especially for the high level noise signals, and can implement better in diagnosis of defective rolling element bearing. 相似文献
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Periodical impulses are vital indicators of rotating machinery faults. Therefore, the extraction of weak periodical impulses
from vibration signals is of great importance for incipient fault detection. However, measured signals are often severely
tainted by various noises, which makes the detection of impulses rather difficult. As such, a proper signal processing technique
is necessary. In this paper, a hybrid method comprised of wavelet filter and morphological signal processing (MSP) is proposed
for this task. The wavelet filter is used to eliminate the noise and enhance the impulsive features. Then, the filtered signal
is processed by the morphological closing operator and a local maximum algorithm to isolate periodical impulses. To select
the proper parameters of the joint approach, i.e., the center frequency, the bandwidth of wavelet filter, and the length of
flat structuring elements (SE), a novel optimization algorithm based on differential evolution (DE) is developed. The results
of simulated experiments and bearing vibration signal analysis verify the effectiveness of the proposed method. 相似文献
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《Measurement》2016
The extraction of repetitive impacts from vibration signals plays an essential role in bearing fault detection. Among different signal processing algorithms, morphological filter (MF) has attracted lots of attention because it could directly extract the geometric structure of the impulsive feature and only needs little computation. However, the conventional MF and some current improvements are based on the local optima of the raw signal to de-noise the noisy signal and its faulty feature extracting capability would be greatly affected by the noise. In this paper, a new improved MF algorithm is proposed to overcome such deficiency. Firstly, morphological gradient (MG) operator is selected in this paper due to its capability of picking up both positive and negative impulses. Then, based on the relationship between the defect induced impulse and a harmonic function with the resonant frequency, the harmonic waveform in a period is adopted to instruct the construction of structuring element (SE). The improved MF can obtain the fault feature from low SNR signals. The processing results of a simulation signal and two sets of experimental signals and a set of comparisons verify the effectiveness and robustness of the proposed method. 相似文献
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基于EMD的能量算子解调方法及其在机械故障诊断中的应用 总被引:24,自引:3,他引:21
为了提取多分量的AM-FM信号的频率和幅值信息,提出了基于EMD (Empirical mode decomposition)的能量算子解调法,并将它应用于机械故障诊断中。该方法首先采用EMD将多分量的AM-FM信号分解成若干个IMF(Intrinsic mode function)分量之和,然后对每一个IMF分量进行能量算子解调,从而提取多分量的AM-FM信号的幅值和频率信息。对机械故障振动信号的分析结果表明,基于EMD的能量算子解调法能有效地提取机械故障振动信号的特征。 相似文献
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