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1
Content available Study on the dynamic response of deep-sea trawlers in sea trials
Xu Qingchao, Xie Yonghe, Cai Hao, Gong Xiwu, Li Detang, Wei Wang, Jia Panpan
Polish Maritime Research
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2023
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nr 1
25--32
EN
The increasing use of automation in fishing vessels has improved trawling efficiency while directly affecting the fishing capacity and cost of fishing vessels. Among the various influencing factors, warp tension and warp length can be varied to automatically balance the retraction and release of warp control. We combined the two parameters and independently designed and developed the key equipment for fishing vessels—the warp dynamometer and meter counter—and control software. The accuracy of the warp tension and length measurements was improved. The designed equipment was applied to sea trials under different working conditions, and the test data records were exported. Next, filtered time-domain graphs of the required parameters were plotted through complex Fourier transform, first-order lowpass filtering, and inverse Fourier transform. The results of data processing using various parameters were compared and analysed to determine the variation trends of the parameters and verify the effects of their balance control. The results indicated that using an automatic balance control system that combines warp tension and warp length can be effective for the fishing operation of offshore double-deck trawlers. In addition, first-order low-pass filtering can be used to filter complex warp tension data. This study also determined the relationship between warp tension and experimental parameters such as warp length and ship speed during the release of control. After the balance control of warp tension and warp length, the net mouth area increased by 30.7% and 36.5%, respectively, and the fishing efficiency of the vessel improved considerably.
2
Content available Detection of Remote Sensing Warp Tension during Weaving on Plain Twill and Satin Fabrics
Kaplan Volkan
Fibres & Textiles in Eastern Europe
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2021
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Vol. 29, no. 1 (145)
35--39
EN
Warp tensions were measured while a machine was operating on a woven cotton fabric with three different woven patterns. This study was carried out with image analysis methods using a high speed camera. Three weave pattern types: plain, twill and satin were woven on the same weaving machine, and thus it could be understood how weave pattern differences affect warp tension. Each of these three weaves was woven in three weft densities: 20, 28 and 45 wefts per cm. These fabrics were able to be made on a weaving machine with an automatic dobby. It was aimed to investigate warp tension differences for three basic weave patterns while keeping all machine settings constant. The weave settings of the dobby were changed for plain, twill and satin weaves. Warp tension calculation was based on the warp elasticity theory. Warp elasticises were measured by image processing methods in MATLAB using a high-speed camera. It was aimed to improve upon the new method of warp extension measurement of fabric when the loom is in operation. It was observed that the warp tension in plain fabric was higher than for twill and satin under the same conditions.
PL
W pracy mierzono naprężenia osnowy podczas wytwarzania tkanin bawełnianych o trzech różnych wzorach. Badanie zostało przeprowadzone metodami analizy obrazu przy użyciu kamery. Na tej samej maszynie tkano trzy rodzaje wzorów splotu: gładki, diagonalny i satynowy, dzięki czemu zbadano wpływ rodzaju splotu na napięcie osnowy. Każdy z tych trzech splotów został utkany w trzech gęstościach wątku: 20, 28 i 45 wątków/cm. Celem pracy było zbadanie różnic naprężeń osnowy dla trzech podstawowych wzorów splotów, przy jednoczesnym zachowaniu stałych ustawień maszyny. Obliczenia naprężenia osnowy oparto na teorii sprężystości osnowy. Elastyczność osnowy mierzono metodami przetwarzania obrazu w programie MATLAB przy użyciu kamery. Celem badania było ulepszenie nowej metody pomiaru wydłużenia osnowy tkaniny podczas pracy krosna. Zaobserwowano, że naprężenie osnowy w tkaninie gładkiej było wyższe niż w przypadku diagonalu i satyny w tych samych warunkach.
3
Content available remote Changeover Process Assessment of Warp-Knitting Let-Off Equipped with Multispeed Electronic Let-Off System
Ji Yong, Jiang Gaoming 1, Tang Mengting
Autex Research Journal
|
2021
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Vol. 21, no. 3
299--304
EN
Warp-knitted fabrics have gained increasing attention due to their excellent properties, and their production is strongly dependent on the warp-based electronic let-off system. Most of the existing control systems are single speed electron let-off structure, which brings a series of issues such as broken yarn, missed needle, and running thread caused by let-off delay, making it hard for manufacturer to produce the required fabrics. To fill the gap, this article proposes a new framework of a multispeed electronic let-off system for warp knitting based on closed-loop control strategy. As a demonstration of the capacity and generalizability of this newly proposed methodology, the 01-type four-channel acoustic vibration analyzer is used to test and analyze the time of switching, the let-off amounts, and the change in warp tension during the process of switching let-off amounts, including the explanation and comparison of difference values of let-off quantities. It is shown that the proposed method for the production of warp-knitted fabrics is a useful method for achieving digital manufacture of warp-knitted fabrics.
4
Content available remote Impact of Whip Roller Parameters on Warp Dynamic Loads for 3D Fabrics Made on a Four-Comb Warp-Knitting Machine
Michalak Andrzej, Kuchar Maciej, Mikołajczyk Zbigniew
Autex Research Journal
|
2020
|
Vol. 20, no. 1
73--77
EN
The most advantageous geometry of the warp feeding system was determined from the viewpoint of compensating temporary changes in the warp length during the technological cycle of a four-comb warp-knitting machine. Dynamic simulations of the feeding system were carried out for 3 different lengths of the shift of the slider with a guide bar – designating variants (series) of the cross-sectional sizes of the 3D knitted fabrics. The courses of instantaneous warp tensions during the operating cycle of the warp-knitting machine were presented. Limit dynamic loads of the warp were determined and presented as a function of natural frequency of the whip roller. Based on the criterion of the smallest dynamic loads of the warp, the optimum natural frequencies of the whip roller were determined. In the analyzed range of the whip roller parameters, they are 3–6 times greater than the operation frequency of the warp-knitting machine.
5
Content available Influence of the Backrest Roller Position on the Properties of Denim Fabrics
Tashakori S. H., Haghighat E., Nosraty H.
Fibres & Textiles in Eastern Europe
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2013
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Vol. 21, no. 4 (100)
60--66
EN
Denim is one of the most traditional and fashionable fabrics. The quality of denim fabrics based on their usage is important. The physical and mechanical properties of denim fabrics have considerable influence on their application and comfort . In this study, the effect of the backrest roller position and finishing process on the physical and mechanical properties of denim fabrics was investigated. For this purpose, grey and finished fabrics at five different positions of the backrest roller on a weaving loom were separately produced. Statistical analysis of the results show that in grey fabric, the position of the backrest roller has significant influence on the breaking strength in the warp direction, breaking elongation, warp yarn density, abrasion resistance, tear resistance, air and water permeability, fabric surface colour, and fabric thickness; and it has no significant influence on the breaking strength in the weft direction, weft yarn density, abrasion resistance, and fabric weight. Moreover, no meaningful effect of the back rest roller position on the properties of the finished fabric was observed.
PL
Mechaniczne i fizyczne właściwości tkanin dżinsowych mają znaczący wpływ na ich zastosowanie i komfort noszenia. W pracy badano efekt pozycji przewału i procesu wykańczania na fizyczne i mechaniczne właściwości tkanin. W tym celu wytypowano wykończone i niewykończone tkaniny i badano tkanie przy 5 różnych pozycjach przewału. Statystyczna analiza wyników wykazała, że dla niewykończonych tkanin pozycja przewału ma znaczący wpływ na ich wytrzymałość na rozerwanie w kierunku osnowy, wydłużenie przy zerwaniu, gęstość osnów, odporność na ścieranie, odporność na rozerwanie, przepuszczalność powietrza i wody, kolor powierzchni tkanin i jej grubość. Natomiast, nie ma istotnego wpływu na wytrzymałość w kierunku wątku, gęstość wątku i masę tkaniny. Co więcej, nie zaobserwowano istotnych zmian w pozycji przewału na właściwości wykończonych tkanin.
6
Content available remote Dynamic cloth fell movement. Part II: New measuring device
Azzam H. A., Büsgen A.
Autex Research Journal
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2006
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Vol. 6, no. 1
23--29
EN
Textile Technology Department, University of Applied Science, Mönchengladbach, Germany A new flexible cloth fell movement measuring device, hereafter referred to as the 'needle-mechanical device', has been developed to facilitate the use, for the first time, of a measuring position just 2 millimetres from the cloth fell. In addition, the experimental set-up was built in a combination between the needle-mechanical device and the Weave Master to record the dynamic cloth fell's movement cycles on-loom. The results of these measurements were analysed and discussed in the light of the theory developed in part I.
7
Content available remote Dynamic cloth fell movement. Part I: Critical review
Azzam H. A., Büsgen A.
Autex Research Journal
|
2006
|
Vol. 6, no. 1
14--22
EN
Extensive coverage of previous work in the area of cloth fell movement, the circumstances of its beginning, and its influences are reviewed. The review also includes previous work describing factors that affect cloth fell movement. The advantages and disadvantages of the methods used hitherto are underlined and the need of a satisfactory measuring method is emphasised.
8
Content available remote Theoretical and Experimental Beat-up Investigation
Katunskis J.
Fibres & Textiles in Eastern Europe
|
2004
|
Vol. 12, no. 3 (47)
24--28
EN
The main aim of this investigation is to determine experimental and theoretical methods of beat-up force measurement. The application of a theoretical fabric formation model is analysed in the article, which also investigates the changes in the warp tension and beat-up forces in the weaving loom. In order to define the reliability of the model, the theoretical and experimental results of beat-up and warp tension force were compared. The beat-up force was investigated during the experiments on the Acutis weaving loom, measuring the bending of the reed by the original gauge device mounted on the slay and warp tension force with the Rothschild R-1192 strain gauge device. The data was written onto a computer hard disk with a PCI PC-20 Data Acquisition Board. The same setting data of the weaving loom was also used in the theoretical analysis of the model. A comparison of the experimental and theoretical data was made. It was established that the experimental beat-up force measuring method proposed is suitable for investigating beat-up force. The results of theoretical warp tension force research and the results of the weft tension force research can also be used in further theoretical research of the fabric formation process.
PL
Podstawowym cełem badań była eksperymentalna i teoretyczna ocena metod pomiaru siły dobicia przy wykorzystaniu teoretycznego modelu formowania tkaniny na krośnie. Analizowano zmiany naprężenia osnowy oraz siły dobicia i, dla podkreślenia wiarygodności modelu, porównano wyniki otrzymane z obliczeń i pomiarów przeprowadzonych na krośnie Acutis. Dla pomiarów zginania płochy, będących funkcją siły dobicia, wykorzystano oryginalny czujnik zamontowany na bidle, podczas gdy naprężenie osnowy mierzono tensometrem Rotschild R-1192. Wszystkie wyniki zapisywano w komputerze i wykorzystano również dla obliczeń teoretycznych. Porównanie wyników eksperymentalnych i teoretycznych wykazało, że zaproponowana metoda pomiaru siły dobicia jest racjonalna. Wyniki badań teoretycznych naprężeń osnowy i wątku można wykorzystać do dalszych teoretycznych rozważań procesu formowania tkaniny
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