Narrow Results

In the process of spinning, the state of machine or inconsequence of corresponding technical parameter will bring various periodic unevenness based on stochastic unevenness of yarn. Spectrum and variance-length curve of yarn signal is not only a primary method to analyze this periodic unevenness of yarn, but also a primary method to check quality of yarn and to diagnose mechanical failure. This paper provided the method to spectrum and variance-length curve of yarn based on wavelet analysis, and established the relation of them. High precision and high calculation speed is demonstrated by this method through experimental comparison and analysis.