Automatic Control of Sliver Thickness by High-Frequency, Small-Capacitance Measuring Principle:Part 7 : Relation between Control and Drafted Sliver Unevenness
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概要
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Parts 3 to 6 reported on the build and properties of an experimentally produced automatic control system complete with a detector of the electric capacitance type.<BR>The present instalment reports on the results of an investigation into the optimum setting for the automatic controller. The investigation has been made by calculating the variance of drafted sliver unevenness with the use of the frequency properties of the control system and powerdensity spectrum of a fed sliver. The results are:<BR>(1) PI or PID controller is suitable to this control system.<BR>(2) The proper front roller surface velocity for this control system is 80 to 100 cm/sec.<BR>(3) The efficacy of this control system becomes poor if the temperature and relative humidity in the laboratory is too low.<BR>(4) Even if detecting is delayed or the phase lead property of the detector is removed, CV of drafted sliver unevenness changes hardly at all, but high-frequency component of the unevenness increases and the optimum setting state becomes stable.<BR>(5) Even if the sensitivity of the detector is reduced, or detection is made only with a measuring roller, or if the Service Selector of the evenness tester is set to Inert, then CV of drafted sliver unevenness changes hardly at all, but the low-frequency component of unevenness increases and the optimum setting state gets more stable.<BR>(6) The standard of frequency component of controlled and drafted sliver unevenness is obtainable from controllable frequency (or controllable wave-length), which we define as the smallest of frequencies which are equivalent to zero dB of the closed frequency property of a control system.
- 社団法人 日本繊維機械学会の論文