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Abstract
Accurate analyses of the yarn tension inside the rotor are available but, since each involves a computer solution, they have not been used to any great extent, especially in estimating the effect of minor changes in rotor design on the internal yarn tension. The present paper provides an approximate solution, which makes it possible to predict changes in internal yarn tension by a simple closed-form solution. The tension at the rotor wall — the tension most difficult to predict — is found by this method to be too large by about 11%, but, despite this error, the result, because of its simplicity, is felt to be useful.
