| The appearance of the fabric will be influenced obviously by the yarns' periodic unevenness. In the practice, even if there is a little difference between two figures of the periodic unevenness, the appearance of the fabric has deteriorated usually. In many cases, spectrum chart can clearly reflect the periodic unevenness and reveal the character of uneven wavelength sufficiently, because rate of unevenness only show figures' change and it's not easy to be find. Yarn is the ultimately product through the whole processes of spinning, usually different wavelengths be plus which made by different processes will lead the unevenness of the yarn, all kinds of the uneven have their own swing, the accidents may happen on different parts of the machines and different processes of the spinning. We can analyze why and where produce the uneven then shrink the range of research and finally find out the really reason with the spectrum chart.In the international the tester of evenness is an advanced equipment in the field of examine yarns' evenness, the tester has been used widely with its facility, accuracy, speediness and so on. Through many enterprises had purchased this kind of tester, they only do some test of periodic evenness, the tester be utilize insufficient. We should not only do the usually test but also exploit its potential in technological development, quality control and trace. This research topic can accurately reflect malfunction of the machine, improvement efficiency of the check, enlarge and perfect the intelligent diagnoses through the study basic on Artificial Neural Networks and expert diagnose system, it will make an important effect on future theoretic research. The equipment, which combines intelligent expert diagnose system arid tester of evenness, is efficiently heighten equipment's level of technology and science, improve the competition of the market. |