Carbon fiber multi-layer angle connection loom yarn tension control method

Abstract

The invention discloses a carbon fiber multi-layer angle connection loom yarn tension control method. The method comprises the steps that based on the flexibility and uncertainty of a carbon fiber weaving material and the time-variation characteristic and nonlinearity characteristic of the technological process, according to the let-off processes of displacement, angle, elastic deformation and pressurization, laplace transformation is carried out at the position of a back rest on the basis of dynamic characteristics, the a mason formula is applied to obtain a transfer function characteristic equation of a high-order differential equation; according to the linear speed, stability and other distribution parameter system characteristics of the textile technological process, a nonlinear system analysis method is utilized for building some mathematical models. A multivariable feedforward and tension feedback combined control structure and an iterative intelligent control algorithm are adopted for warp tension, a non-ideal control signal is corrected through the deviation of the practical output and expected output of a system, and the yarn tension is kept constant by controlling the rotating speed of a servo motor and a tension adjusting device.

Description

technical field [0001] The invention relates to the technical field of textile technology and equipment, in particular to a method for controlling the yarn tension of a carbon fiber multilayer corner loom. Background technique [0002] Today, with the rapid development of science and technology, carbon fiber and its carbon fiber composite materials are favored by high-tech fields such as aerospace, energy, and ships because of their unique and excellent performance. Carbon fiber fabric is used as a reinforced structural skeleton of composite materials, and its preparation technology is particularly important. Corner weaving technology is a new composite skeleton weaving technology developed on the basis of multi-layer warp weaving technology. Through technical research, Tianjin University of Technology has developed a carbon fiber multi-layer corner weaving equipment with complete intellectual property rights. Compared with traditional ordinary looms, the let-off system an...

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Problems solved by technology

Different fabric structures cause different opening widths between warp yarns, so the opening process increases the interference of warp yarn tension

(3) Carbon fiber or glass fiber with high strength, high modulus and poor friction resistance is the main weaving fiber, and the friction between the warp yarn and the brown silk eye and the conveying roller causes the warp breakage rate and the weaving efficiency is reduced

From the analysis of the whole weaving process, the warp tension system is a complex system with time-varying, nonlinear, multi-variable interference and strong coupling between tension and speed. The traditional warp tension control method can no longer meet its control requirements.

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