基于中值滤波－奇异值分解的胶合板拉伸声发射信号降噪方法研究

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (12) : 135-140.

论文

基于中值滤波－奇异值分解的胶合板拉伸声发射信号降噪方法研究

徐锋; 刘云飞

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Research on noise reduction of acoustic emission signals generated from plywood stretching based on median filter-singular value decomposition

XU Feng, LIU Yun-Fei

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摘要

为了去除声发射信号中的随机噪声与脉冲干扰，提高有用信号质量，提出了一种中值滤波与奇异值分解相结合的降噪方法。该方法首先对原始声发射信号进行中值滤波，去除幅值较大的异常值，其次对去除异常值的信号序列进行相空间重构和奇异值分解，最后针对难以确定重构阶数这一问题，提出奇异值能量差分谱概念，并利用能量差分谱的较大峰值位置来确定奇异值的重构阶数，以实现降噪。数值仿真和五层胶合板脱胶和表板断裂测试的实测数据分析表明，该方法能够有效地保留原有信号的特征，并能最大限度地消除噪声，提高信噪比

Abstract

In order to reduce the random noises and pulse disturbances in acoustic emission (AE) signals and to enhance the quality of useful signals, A new method combining median filter and singular value decomposition was proposed. Firstly, the outliers in the original AE signals were suppressed by median filter. Secondly, signal sequences removed outliers was reconstructed in phase space, and the attractor track matrix was decomposed by singular value decomposition (SVD). Finally, the concept of energy difference spectrum of singular value was put forward to determine reconstruction order of singular value according to its major peak position. The numerical simulation results and measured data of degumming and surface fracture of five-plywood show that the method proposed in the paper can retain the original signal characteristic efficiently, and can eliminate noise and enhance the signal-to-noise ratio in a maximum extent.

导出引用

徐锋;刘云飞. 基于中值滤波－奇异值分解的胶合板拉伸声发射信号降噪方法研究[J]. 振动与冲击, 2011, 30(12): 135-140

XU Feng;LIU Yun-Fei. Research on noise reduction of acoustic emission signals generated from plywood stretching based on median filter-singular value decomposition[J]. Journal of Vibration and Shock, 2011, 30(12): 135-140