摘要
采用最优小波包阈值降噪方法对撞击流反应器内瞬时速度信号进行降噪处理.通过降噪前后对比发现:最优小波包阈值降噪方法能够较好地去除原始信号中噪声引起的尖峰和突变,显现出平滑的变化状态,且降噪后的信号可以较好地保持原始信号的信息量.对降噪前后信号的混沌吸引子相图进行对比,可以确定最优小波包阈值降噪方法的有效性.
Filtering noise is one of the key techniques in signal processing. As the developing and perfecting of wavelet,wavelet packet can be used for higher resolution analysis. Much random noise in nonstationary signal can be well filtered by the method of wavelet packet threshold denoising. The instantaneous velocity signal in impinging stream reactor （ISR） was denoised by means of best wavelet packet threshold denoising. The distinction between original signal and denoised signal indicated that best wavelet packet threshold denoising was an effective method for velocity signal.
出处
《沈阳化工大学学报》
CAS
2015年第2期159-163,共5页
Journal of Shenyang University of Chemical Technology
基金
国家自然科学基金项目(21476141)
辽宁省自然科学基金项目(201202174
20102179)
关键词
撞击流
速度信号
小波包
阈值
降噪
impinging stream
velocity signal
wavelet packet
threshold
de-noise
