Research On Weaving Process And Tension Control Of Carbon Fiber Angle Loom

Carbon fiber three-dimensional fabrics,as a reinforcing structural skeleton,plays a very important role in the manufacturing of composite materials.The equipment and technology of high-performance carbon fiber three-dimensional fabric woven is the focus of research in the key manufacturing technology of carbon fiber composite materials.This paper is mainly devotedto solve the technical problems related to carbon fiber tension control in the weaving and the entire weaving process of carbon fiberfabrics,and in-depth research is conducted in mechanism design,weaving process and tension control technology.Combined with the type and structure characteristics of carbon fiber fabrics,this paper studies the working principle and analyzes the action sequence of carbon fiber multilayer diagonal loom,designs the special let-off mechanism and the whole machine equipment suitable for 30 layer carbon fiber multilayer diagonalloom,and realizes the positive let-off and negative warp tension control.It is proposed that a set of "V" type cloth frame and 60 sets of servo motors are used to control 60 tissue axes respectively,corresponding to 90 sets of double roll swing type warp tension adjusting device.To ensure that the warp is symmetrically fed into the tension compensation mechanism and symmetrically led out for weaving,which can meet the warping requirements of various kinds of fabric structures,warp types andweaving processes.In the weaving technology,the carbon fiber weaving performance,fabric structure and other physical characteristics are analyzed in this paper,the carbon fiberdiagonal loom fabric weaving method is studied,the drawing-in method is designed,and the machine weaving process is optimized.The multi-unit warp let-off system,multi-layer warp yarn channels and uniform yarn layer layout are designed,after experiment and testing,it can effectively adapt to the characteristics of carbon fiber with high modulus and poor elasticity,reducing friction between carbon fibers.It is proposed that the meridional movement should be carried out according to the instruction of "fabric pattern",so that the movement of various departments can be coordinated and distributed,and the unified and positive movement mode before and after the warp yarn can be realized.The problem of multi-layer warp yarn arrangement and multi-shed opening is well solved,and more than 20,000 carbon fiber warp yarns are effectivly controlled.Combined with the characteristics of distributed parameter system in weaving process,according to the time variability of the axis radius of the loom,considering the uncertainty of internal parameters and external disturbance,the mathematical model of tension control of let-off and take-up system with electromagnetic torque of let-off and take-up motor as input is established by using the nonlinear system analysis method.In addition,considering the opening and beating movements in the movement process that cause uncertain interference to the system,a fifth-order let-off and take-up cooperative control mathematical model is esdablished.Based on the established mathematical model of cooperative control,starting from the sliding mode approach speed and sliding mode surface design,the tension control strategy based on equivalent sliding mode control is proposed,the corresponding sliding mode controller is designed,the stability theory of sliding mode control is proved,and the corresponding system control experiment is given,which verifis that the collaborative control strategy based on sliding mode control can effectively improve the robustness of the tension control and improve the tension control performance of the carbon fiber multilayer diagonal loom.Meanwhile,by selecting different free parameters,the system response time is shorten to less than 1s,and the better control effect is obtained.