Abstract
A new finite element dynamic model of a moving yarn segment has been proposed in this paper based on the absolute nodal coordinate formulation (ANCF). Apart from taking into account the elastic properties of the yarn in three dimensions, the model also considers the viscosity in the longitudinal direction and takes into account the effect of gravity and air resistance. In this paper, the simulation described the movement of the yarn segment that is pulled by the fixer on the guideway. Then, a corresponding experiment was proposed to evaluate the theoretical model. The theoretical and experimental comparisons of the motion tracing exhibited good agreement, demonstrating that the new model could predict the actual moving trace of the yarn segment. Moreover, another simulation of the spatial motion of the yarn segment was presented, to elucidate the role of the model in predicting the movement of the yarn segment. After considering the parameters of the actual process and its constraints, the authors established that the proposed model could be used to predict the trajectory of a yarn segment in the actual production process, which is vital when fabricating textile products.
Highlights
As the intermediate component and fundamental constituent of the process of turning fiber into fabric in the textile industry, the quality of the yarn directly affects the quality of the final textile product
In the process of producing textiles, in addition to the continuous moving yarn, there is another state in which the yarn is clamped by a machine at one end and the rest of the yarn keeps moving under the pulling action of the machine, for example, a yarn segment that protrudes from the nozzle of the machine during air-jet weft insertion (Figure 1(a)) or during the pneumatic yarn splicing process, or a yarn segment on the bobbin when the yarn is broken during spinning (Figure 1(b)), or a yarn segment at the start of the filament winding process (Figure 1(c))
The simulation in this paper only considered the viscosity in the longitudinal direction, which is a reasonable and efficient assumption when the moving yarn segment is subjected to high tension
Summary
As the intermediate component and fundamental constituent of the process of turning fiber into fabric in the textile industry, the quality of the yarn directly affects the quality of the final textile product. In the process of producing textiles, in addition to the continuous moving yarn, there is another state in which the yarn is clamped by a machine at one end and the rest of the yarn keeps moving under the pulling action of the machine, for example, a yarn segment that protrudes from the nozzle of the machine during air-jet weft insertion (Figure 1(a)) or during the pneumatic yarn splicing process, or a yarn segment on the bobbin when the yarn is broken during spinning (Figure 1(b)), or a yarn segment at the start of the filament winding process (Figure 1(c)). The feature that is common to all of these yarn segments is that one end of the yarn is pulled by a mechanical device to complete various types of movement. The actual movement of the yarn segment which is held by the gripper is critical, and the success of this action is determined by whether the yarn can move according to the planned path
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