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Investigation of Open End Yarn Tension Using an Elastic Yarn-Guide

Shukhratov Sharof, Milašius Rimvydas, Gafurov Jakhongir, Mardonov Batir, Gafurov Kabuljon, Repon Md. Reazuddin

Fibres & Textiles in Eastern Europe

2021

Vol. 29, no. 4 (148)

43--47

This paper presents the results of Open End (OE) yarn tension investigation using a yarn-guide funnel with an elastic element. Obtained were the dependencies of tension change on such factors as body mass, elastic element rigidity, yarn coordinates on the funnel surface, and the speed of yarn moving. The values of these factors cause fluctuations in yarn tension and, consequently, in yarn structure and characteristics. On the basis of experiments, it was shown that due to using of a yarn-guide funnel with an elastic element, a decrease in yarn unevenness is achieved. It is easily regulated by the funnel mass, the rigidity rate of the elastic element, and the spinning speed.

W artykule przedstawiono wyniki badań naprężenia przędzy podczas przędzenia bezwrzecionowego za pomocą lejka prowadzącego przędzę z elementem sprężystym. Przeanalizowano zależności zmiany naprężenia od czynników takich jak: masa ciała, sztywność elementu sprężystego, współrzędne przędzy na powierzchni lejka oraz prędkość poruszania się przędzy. Wartości czynników spowodowały wahania naprężenia przędzy, a co za tym idzie, jej struktury i właściwości. Na podstawie eksperymentów wykazano, że dzięki zastosowaniu lejka prowadzącego przędzę z elementem sprężystym zmniejszono nierówności przędzy.

Test bench and simulation research on hydrodynamic torque converter for different input signals

Wozniak M., Siczek K., Pawelski Z.

Journal of KONES

2016

Vol. 23, No. 4

561--568

This paper presents the experimental research and simulating results of a ZM130 hydrodynamic torque converter under steady and unsteady working conditions with an external step signal and sinus on turbine’s shaft on a modified test bench. The mathematical model of torque converter was described by the one-dimensional flow theory with variable loss coefficients. The character of received equations from test bend showed by linearized transmittance functions with variable coefficients. For test bend object identification researches will be used an Identification Toolbox from a mathematical code in Matlab, which enables to create transfer functions as a linear model from measurements data as they got the highest correctness level with input signal (as they get the best correction level with input signal on the pump´s shaft). This mathematical model for dynamic loads will be verified by experimental tests. The aim of the carried out studies was determination the effect of sampling time decreasing on the quality of measured parameters. Results of present investigations were compared with those obtained earlier, but for the same input signals .It is possible to affirm that proposed theoretical model imitates the change of dynamic parameters, and the same the property of the torque converter. Researches led on the test bend with extortion input torque sinus signal on the turbine’s shaft confirmed correctness of this model.