High-Frequency Yarn Tension Variations in Spinning

1980 ◽  
Vol 102 (1) ◽  
pp. 45-50
Author(s):  
E. Dyson ◽  
G. Afshari
Keyword(s):  
Experimental Investigation ◽  
Periodic Structure ◽  
Coefficient Of Variation ◽  
Rotational Speed ◽  
High Frequency ◽  
Ring Spinning ◽  
Statistical Parameters ◽  
Yarn Tension ◽  
Rotor Spinning

A description of an experimental investigation of the variations in yarn tension during both ring and rotor open-end spinning which have frequencies equal to, or greater than, the rotational speed of the system is given. Typical results are illustrated and discussed both in terms of statistical parameters such as the coefficient of variation and in terms of their spectra. Tension variations during rotor spinning are shown to have, in general, a much less pronounced periodic structure then the corresponding variations during ring spinning.

An experimental investigation of yarn tension in simulated ring spinning

2004 ◽  
Vol 5 (4) ◽  
pp. 275-279 ◽  
Author(s):  
Zheng-Xue Tang ◽  
Xungai Wang ◽  
W. Barrie Fraser ◽  
Lijing Wang
Keyword(s):  
Experimental Investigation ◽  
Ring Spinning ◽  
Yarn Tension

Experimental Investigation of very High Frequency Slot Antenna on M-60A-1 Tank

1977 ◽  
Author(s):  
D. V. Campbell ◽  
William Kennebeck ◽  
A. Zanella ◽  
Paul Sexton
Keyword(s):  
Experimental Investigation ◽  
High Frequency ◽  
Slot Antenna ◽  
Very High Frequency ◽  
Very High

scholarly journals Метод моделирования диэлектрической проницаемости анизотропного иерархически построенного нанокомпозита с периодической структурой

2021 ◽  
Vol 47 (16) ◽  
pp. 3
Author(s):  
С.А. Корчагин ◽  
Д.В. Терин
Keyword(s):  
Dielectric Constant ◽  
Electromagnetic Radiation ◽  
Periodic Structure ◽  
High Frequency ◽  
Resonance Absorption ◽  
Complex Dielectric Constant ◽  
Quantum Mechanical ◽  
Equivalent Circuits ◽  
Quantum Mechanical Calculations ◽  
Effective Medium Model

A method is proposed for modeling the complex dielectric constant of an anisotropic hierarchically constructed nanocomposite with a periodic structure, based on the complex application of quantum mechanical calculations, an effective medium model, and equivalent equivalent circuits. The dielectric constant of the TiO2 - Al2O3 nanocomposite under the action of external high-frequency electromagnetic radiation has been investigated. The wavelength ranges at which resonance bursts are observed are determined. The possibility of controlling the maxima of difference losses and resonance absorption maxima by changing the geometric parameters of the nanocomposite is shown.

scholarly journals STUDI AWAL PEMBUATAN ALAT PENGUKUR TWIST AKTUAL PADA BENANG TEKSTIL MELALUI PEMODELAN MATEMATIK DAN VALIDASI EKSPERIMEN

2019 ◽  
Vol 2 (2) ◽  
pp. 105-112
Author(s):  
Valentinus Galih Vidia Putra ◽  
Andrian Wijayono
Keyword(s):  
Theoretical Approach ◽  
Theoretical Consideration ◽  
Textile Yarn ◽  
Measurement Tool ◽  
Ring Spinning ◽  
Rotor Spinning ◽  
Yarn Count ◽  
Relationship Of ◽  
The Relationship

Pada bidang tekstil, perhitungan nomor benang, Nm, daapt dijabarkan dengan mengetahui besar puntiran (twist) pada benang. Pada penelitian ini pemodelan secara teori untuk menghubungkan antara besar puntiran dan juga nomor benang, baik pada mesin pintal rotor dan juga mesin pintal ring sudah didapatkan dan dikembangkan untuk mendapatkan sebuah pemodelan yang baik dan dapat memperlihatkan besar nilai puntiran nyata benang. pada penelitiann ini rumusan hasil studi sudah divalidasi yang digunakan untuk memperlihatkan hubungan antara nomor benang dan puntiran secara lebih umum menggunakan pendekatan teori. Pada penelitian ini juga telah dirancang suatu alat untuk menghitung puntiran nyata tersebutKata kunci: puntiran nyata ,tekstil ,nomor benang In textile, calculation the yarn count, Nm, can be derived by knowing the twist of yarn. Theoretical consideration for a modeling the relationship of twist and the  yarn count,  both in rotor spinning and ring spinning, has been done and  developed to get a good model to show the actual twist. In this research, the formula has been verified and it has been investigated to show the relationship of twist with yarn count completely by theoretical approach and also it has done fabrication the actual twist measurement tool.   Keywords: actual twist, textile, yarn count

scholarly journals Mathematical Modeling of Dynamic Yarn Path Considering the Balloon Control Ring and Yarn Elasticity in the Ring Spinning Process Based on the Superconducting Bearing Twisting Element

2018 ◽  
Vol 26 (5(131)) ◽  
pp. 32-40 ◽  
Author(s):  
Mahmud Hossain ◽  
Christian Telke ◽  
Anwar Abdkader ◽  
Maria Sparing ◽  
Tilo Espenhahn ◽  
...  
Keyword(s):  
Magnetic Bearing ◽  
Spindle Speed ◽  
Frictional Heat ◽  
Ring Spinning ◽  
German Research Foundation ◽  
Yarn Tension ◽  
Tension Distribution ◽  
Spinning Process ◽  
Fundamental Research ◽  
Superconducting Magnetic Bearing

The productivity of the conventional ring spinning process is currently limited by the frictional heat that occurs in the ring/traveler twisting system. In the framework of a fundamental research project from the German Research Foundation (DFG), the levitation principle of superconducting magnetic bearing (SMB) was implemented as a twisting element in order to eliminate the frictional problem and thus aim, at least, to double the productivity. A mathematical model of the dynamic yarn path has already been presented considering the friction free SMB system up to an angular spindle speed of 25,000 r.p.m. In this paper, the existing theoretical model, which was developed up to 25,000 r.p.m, was further modified considering the balloon control ring and yarn elasticity at a higher angular spindle speed, such as 50,000 r.p.m. The model was solved numerically using the RUNGE-KUTTA method. With this model, it is possible to estimate the yarn tension distribution and balloon form considering the above-mentioned parameters. The model established was further validated by comparing the yarn tension and balloon forms predicted with measured ones up to an angular spindle speed of 15,000 r.p.m in a ring spinning tester based on superconducting magnetic bearing.

scholarly journals Mathematical modeling, simulation and validation of the dynamic yarn path in a superconducting magnet bearing (SMB) ring spinning system

2016 ◽  
Vol 87 (8) ◽  
pp. 1011-1022 ◽  
Author(s):  
M Hossain ◽  
C Telke ◽  
M Sparing ◽  
A Abdkader ◽  
A Nocke ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
New Technology ◽  
Superconducting Magnet ◽  
Magnetic Bearing ◽  
Ring Spinning ◽  
Yarn Tension ◽  
Runge Kutta Method ◽  
Superconducting Ring ◽  
Superconducting Magnetic Bearing

The new concept of a superconducting magnetic bearing (SMB) system can be implemented as a twisting element instead of the existing one in a ring spinning machine, thus overcoming one of its main frictional limitations. In the SMB, a permanent magnet (PM) ring rotates freely above the superconducting ring due to the levitation forces. The revolution of the PM ring imparts twists similarly to the traveler in the existing twisting system. In this paper, the forces acting on the dynamic yarn path resulting from this new technology are investigated and described with a mathematical model. The equation of yarn movement between the delivery rollers and the PM ring is integrated with the Runge-Kutta method using MATLAB. Thus, the developed model can estimate the yarn tension and balloon form according to different spindle speeds considering the dynamic behavior of the permanent magnet of the SMB system. To validate the model, the important relevant process parameters, such as the yarn tension, are measured at different regions of the yarn path, and the balloon forms are recorded during spinning with the SMB system using a high speed camera.

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