Finite Element Analysis And Precise Spinning Process Parameter Control Of Collagen And Chitosan Absorbable Suture Formation
Keywords
Chitosan And Collagen, Absorbable Suture, Finite Element Analysis, Linear Array Ccd, Generalized Predictive Control Algorithm Collagen, And, Chitosan, Absorbable, Suture, Finite, Element, Analysis, Linear, Ccd, Generalized, Predictive, Control, Algorithm
Abstract
In order to solve the problem of uneven wire diameter and strength in the wet spinning process of absorbable sutures made of collagen and chitosan materials, numerical simulation of the molding of this material and the control system design of the spinning forming machine were carried out. Numerical simulation Gambit and Fluent software were used to conduct a finite element analysis of the jet nozzle flow field of the mixed liquid, and theoretically demonstrated the feasibility of adjusting the suture line diameter by controlling the spinneret tension; on this basis, the JK1601 vertical A closed-loop control system for the two key parameters of winding tension and wire diameter was developed on the tubular wet spinning machine. The winding tension control is implemented using a normalized PID control algorithm; the wire diameter control uses linear array CCD non-contact online measurement and improved This is achieved by combining adaptive generalized predictive control algorithms. Experiments show that the suture samples produced by the improved JK1601 spinning machine meet the requirements of the 35th edition of the United States Pharmacopeia, and the non-uniformity in diameter and tensile strength has increased by 25.4% from the original. , 33.2% reduced to less than 5.0%. In the wet spinning process of absorbable suture of collagen and chitosan materials, in order to solve the problem of its uneven diameter and tensile strength, the numerical simulation of this kind of material and the design of the control system of spinning machine were carried out. The finite element analysis is carried out on the jet nozzle flow field of the mixed liquid by Gambit and Fluent software for numerical simulation. The results demonstrate the feasibility of adjusting the suture diameter by controlling spinning tension theoretically ; On this basis, the closed-loop control system of winding tension and suture diameter of two key parameters was developed on the JK1601 type vertical tube wet spinning machine. Control of winding tension was realized by normalized PID control algorithm; Control of suture diameter was realized by the combination of linear CCD non contact online measurement and improved adaptive generalized predictive control algorithm. Experiments show that the suture samples made by the improved JK1601 type spinning machine meet the requirements of the United States Pharmacopoeia thirty-fifth Edition. The inhomogeneity of diameter and tensile strength is controlled from 25.4%, 33.2% to less than 5%.
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Original research was done by Sui Xiuwu, Wang Shuo, Li Yao, Li Yan
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