改進(jìn)EMD閾值小波濾波方法
[Abstract]:The motor torque identification accuracy is seriously affected by the current signal noise of AC servo motor in the autonomous rehabilitation training robot of lower extremity. An improved threshold wavelet filtering algorithm based on empirical mode decomposition (EMD) is proposed to solve the problem of filtering and denoising nonlinear non-stationary signals. First, the optimal denoising layer number of EMD and the threshold processing function of threshold wavelet are analyzed and improved, then the two improved methods are combined. Finally, Gao Si noise is added to the Heavy sine signal in Matlab, and the improved method and soft are used respectively. The denoising experiment is carried out by hard threshold and other filtering methods. Simulation results show that the improved algorithm can effectively remove noise signals from nonlinear non-stationary signals. Compared with other filtering methods, such as EMD and threshold wavelet, the SNR of this filtering algorithm is larger, the root mean square error is smaller, and the filtering effect is better.
【作者單位】: 西安交通大學(xué)機(jī)械工程學(xué)院;
【基金】:國(guó)家自然科學(xué)基金重大研究計(jì)劃項(xiàng)目(91420301)資助
【分類號(hào)】:TN713;TP242
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