基于改进阈值法的平移不变小波压力脉动去噪研究  

Research of Pressure Fluctuation Signal Denoising Based on Translation Invariance Wavelet and Improved Threshold Method

作　　者：黄建招[1] 谢建[1] 高钦和[1] 李良[1] 

机构地区：[1]第二炮兵工程学院,陕西西安710025

出　　处：《机床与液压》2012年第15期161-164,144,共5页Machine Tool & Hydraulics

摘　　要：针对传统软、硬阈值函数和广义阈值在消噪处理中存在恒定偏差、不连续等缺点,提出一种改进阈值函数和新阈值相结合的新方法。为避免传统的小波变换去噪在信号的不连续点上产生Pseudo-Gibbs现象,将平移不变量方法与上述改进阈值去噪方法相结合。采用该方法对实验测取的压力脉动信号进行消噪处理,结果表明:该方法提高了重建信号的信噪比,降低了均方根误差值,有效地消除了信号噪声。Aiming at the disadvantages of the classic soft and hard threshold function with the generalized threshold, such as constant deviation, discontinuous and so on, a new method composing improved threshold function and new threshold was presented. In order to avoiding the Pseudo-Gibbs phenomenon in discontinuous points by using the classic wavelet transform, the translation invari- ance wavelet and the new method were combined together. The experimental results of the pressure fluctuation signal denosing demon- strate that using the new method, the signal-to-noise ratio of the rebuilt signal is improved, and the noises of signal are greatly elimina- ted.

关 键 词：小波变换 平移不变量方法 阈值去噪 压力脉动 

分 类 号：TP271.3[自动化与计算机技术—检测技术与自动化装置] TH137.7[自动化与计算机技术—控制科学与工程]