【摘要】 针对ICA降噪技术中引入噪声通道的局限性,采取以扩展通道替代虚拟噪声通道的方法,将ICA的思想引入到结构同测点多通道振动信号处理中。叙述了ICA原理,FastICA算法的实现及其运用于振动信号降噪的思路,通过对实验梁同测点两通道振动信号的处理,并引入自相关函数和FFT谱衡量降噪效果,结果表明,采用扩展通道运用ICA进行结构振动信号降噪的可行性。更多还原

【Abstract】 In view of the limitation to noisy channels based on the ICA,hypothesized noise channels were replaced by expanding channels in this paper.The ICA method was introduced to de-noise the same position and many channels structural vibration signals.The principles of ICA and FastICA algorithm were elaborated and the same position and two channels vibration signals of beam were de-noised by ICA.This method was proved effectually by the beam vibration signals in lab.Autocorrelation function and FFT spectrum were adopted to weigh the noise reduction effect.It was showed that it was feasible to adopt expanding channels and ICA to reduce noise of structural vibration signals.更多还原