Effect of yarn, machine and knitting process parameters on the dynamics of the circular knitting needle

Duru, Sena Cimilli; Candan, Cevza; Muğan, Ata

doi:10.1177/0040517514547216

Cited by 8 publications

(4 citation statements)

References 24 publications

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“…However, most works are devoted to the dynamic analysis of the needles' interaction with pitched cams [20,21], among which -the classical work [22], where the theoretical positions and experimental data are systematized to estimate the number of impact loads and determine the rational design parameters of the knitting systems. Taking this, the dynamic models are not enough to analyze the reliability of the needles, because there is no unified transition from the spectrum of variable loadings to the equivalent stresses in the needles at corresponding cycles of their endurance to failure.…”

Section: Literature Reviewmentioning

confidence: 99%

Estimation of Fatigue Longevity of Rod Elements of Complex Form

Berezin

Rubanka

et al. 2021

Period. Polytech. Mech. Eng.

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The questions of design maintenance of a given fatigue longevity of rods of complex form during the intensification of load modes without changing of geometric, inertial and rigidity parameters of roads are considered. The study is conducted on the example of needles of circular machines with a small diameter of cylinder (automatic half-hose machines). An approach, based on the system of calculation of loads, loadings and resources under the criterion of fatigue strength, is proposed. The key link for the transition from the results of dynamic analysis to the determination of reliability indices is the dependence of limited longevity of needles on the cycles of load to fatigue failure with the use of statistical data on operating time to fatigue failure of the needles in production conditions. Since the random values of loads of the needles do not obey the normal law of distribution, the general description of density of distribution of amplitude of loads is presented. The influence of increase in speed parameters and constructive measures, aimed to reduce the corresponding loads at a current size of critical section of the needles, on the fatigue longevity is analyzed.

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Section: Literature Reviewmentioning

confidence: 99%

Estimation of Fatigue Longevity of Rod Elements of Complex Form

Berezin

Rubanka

et al. 2021

Period. Polytech. Mech. Eng.

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“…Duru et al. 11 presented metrological investigations of the resistance of the knitting needle during the process. De Vasconcelos et al.…”

mentioning

confidence: 99%

Geometrical modeling of yarn motion and analysis of yarn tension during stitch formation process in warp knitting machines

Golla

Häntzsche

Hoffmann

et al. 2023

Textile Research Journal

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In the textile sector, the sustainable development and production of high-performance and high-quality textiles has become increasingly important. To enable the processing of new yarn materials at high production speeds, the in-depth understanding of the relationships between machine elements, yarn path, and yarn tension is required. Therefore, the aim of this paper is to analyze the interactions between the warp knitting machine unit and the yarn path during the stitch formation process by means of theoretical modeling and experimental investigation. A vector-based model has been developed to describe the kinematic yarn path and its correlation with yarn demand during the stitch formation process. The model is validated by measurements of yarn path and yarn tension on a warp knitting machine. The model is used to identify both machine and yarn guide elements that influence stitch formation.

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“…At present, the piezoelectric needle selectors on the market generally use an open-loop jacquard process. 1 This method very easily causes jacquard errors due to the unstable working state of the bimorph piezoelectric driver, which causes fabric defects. Jie et al 2 tested the overall performance of the needle selector according to the current variation characteristics of the drive circuit.…”

mentioning

confidence: 99%

Needle selector failure detection based on piezoelectric sensor and driver co-location characteristics

Peng

Zhong

et al. 2022

Textile Research Journal

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Aiming at the problem of the malfunction of knitting machines caused by the unstable operation of the piezoelectric needle selector during the jacquard process, a state detection scheme for the piezoelectric needle selector that integrates the sensor and drive function co-located is proposed. The motion state of bimorph piezoelectric cantilever beam and its bi-directional piezoelectric effect in the jacquard process of piezoelectric needle selector are analyzed. Electrical and dynamic models were established for the electrical characteristics inside the bimorph piezoelectric cantilever beam and the dynamic characteristics of the cutter head and baffle of the needle selector. The signal detection circuit is designed to realize the real-time detection of the piezoelectric needle selector state by analyzing the time domain and frequency domain characteristics of the electrical signal. The results show that in the normal working state of the piezoelectric needle selector, the internal electric signal of the piezoelectric driver has two characteristic frequencies, which are between 155 and 180 and between 1630 and 1670 Hz, and the time for the piece to swing to the limit position is relatively long under abnormal working conditions.

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Effect of yarn, machine and knitting process parameters on the dynamics of the circular knitting needle

Cited by 8 publications

References 24 publications

Estimation of Fatigue Longevity of Rod Elements of Complex Form

Estimation of Fatigue Longevity of Rod Elements of Complex Form

Geometrical modeling of yarn motion and analysis of yarn tension during stitch formation process in warp knitting machines

Needle selector failure detection based on piezoelectric sensor and driver co-location characteristics

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