using finite-element method for analyzing the effect of coriolis acceleration on the ring-spinning baloon

This study is aimed at deriving a dynamic theory of twist insertion in the ring-spinning balloon and diagnosing the effects of Coriolis acceleration on the yarn tension and configuration. To do so, the relationship between twist insertion and tension of the yarn was explained. The yarn tension at the pigtail in the ring spinning machine was measured by a novel set up; in which, traveler revolution (r.p.m.) was also sensed. The results were used in a simulation program as the boundary values. For simulation, a computer model in finite element method (FEM) was introduced, which can predict the effect of the existing forces on the stress distribution. It was observed that the equations, governing the yarn path, and the movement equation of twist in the yarn were completely dependent on each other. The Coriolis acceleration had a little effect on the balloon configuration, although it made tension in the yarn. Nevertheless, to obtain better and more accurate results, Coriolis acceleration might be taken into consideration.