摘要
采取小波算法,运用小波变换阀值法对振动信号进行去噪。对比了传统的软阀值函数和硬阀值函数的优缺点,并在软、硬阀值函数的基础上,提出了一种改进的阀值函数的方法。通过与软、硬阀值函数方法去噪效果的仿真对比分析,新的去噪方法提高了重构信号的信噪比,可以有效去除噪声,并对原始信号的细节特征保留较好。
Wavelet algorithm and wavelet transform threshold method are used in vibration signal denoise. The advantages and disadvantages of classical soft threshold function and hard threshold function are compared, and an improvement method of the threshoht function denoise is proposed based on hard and soft threshold function. Compared with simulation resuhs of hard and soft threshold function, the new denoise scheme can improve signal-to-noise ratio of the reconstructed signal can remove the noise effectively and reserve the main characteristics of the original signals.
出处
《机械工程师》
2015年第1期154-156,共3页
Mechanical Engineer
关键词
振动信号
小波变换
阀值函数
去噪
信噪比
vibration signal
wavelet transform
threshold function
denoise
signal-to-noise ratio
