Establishment and application of mathematical model of computerized fly frame control system

According to the complexity of the mechanical structure of conventional fly frame,the paper analyzed the shaping principle of roving winding,and put forward the overall design scheme of multi-motor driving fly frame,eliminating the multifarious mechanical structure whose corresponding function is fulfilled by several motors controlled by a computer.It discussed the differences of three winding mathematic models,and established a mathematic model of roving winding accordingly.The influence of average thickness of each roving layer and the diameter of bare bobbin on the yarn tension was presented,as well as the related curves.Especially,from the point of view of practical use,the zone of ideal reversing and stop-inhibition was analyzed,and a mathematical model of reversing and stop-inhibition was developed,and suitable for yarns of various counts and reversing either back or forward,thus providing a guarantee for good shaping.The differences of parameters adjustment methods between the computerized fly frame and the conventional one were introduced,showing that the computerized fly frame has higher practical value for its convenience in parameter presetting and adjusting,and change of roving varieties as well.