| Spindle system is the core part of the winding machine.Due to the structure and contact coupling as well as the characteristics of flexible support,it has complex dynamic behavior,which has long restricted the independent research and development of highspeed winding machine in China.In order to meet the production of high performance fibers such as polyester FDY and polylon filament,a winding spindle with a winding speed above 4600m/min and a jacket length of 1800 mm is developed to fill the gap in the development of domestic high-speed long spindle winding machine.In this paper,the rotor dynamics theory and finite element modeling method are applied to establish the dynamics model of high-speed long spindle system;based on sensitivity analysis and response surface method,the structural parameters of the spindle are optimally designed to meet the requirements of high-speed long spindle system dynamics.In this paper,a design method is proposed to optimize the individual components first and then to analyze the integrated system.The main research work and results are as follows.（1）The existing high-speed winding spindle structure is analyzed,and the main structure of high-speed long spindle is determined;the workflow and characteristics of the spindle system are analyzed,and its main process parameters and working characteristics are mastered;the performance requirements of the spindle system are analyzed,and the targets and goals of structural parameter optimization are determined.（2）Analyze the structural and contact parameter coupling relationship between the main components of the spindle system.Based on the theory of rotor dynamics and finite element method,the dynamics model of high-speed long spindle system is established to lay the foundation for dynamic characteristic analysis and structural parameter optimization.（3）The key parameters of the high-speed long spindle system are obtained,including the structural parameters of the spindle system and the dynamic parameters of the support system.Then,the key structural parameters are selected based on the response surface method with the minimum deflection of the jacket;finally,the structural parameters are determined with the maximum stiffness of the supporting arm under the coupling relationship of the structural parameters of the components.（4）The modal analysis of the high-speed long spindle system is carried out to grasp the inherent frequency and vibration pattern of the selected high-speed long spindle system at the maximum operating speed;and to find out the modal state of the system at the maximum operating speed for the transient equivalent structure,so as to indicate the direction for further adjustment of the relevant parameters to improve the dynamic characteristics of the spindle system.（5）Based on the established dynamic model of the spindle system and the optimized structural dimensions,the dynamic equations considering the structural coupling and the frequency-varying parameter characteristics of the rubber ring support are obtained,and the transient response of the spindle system during the rapid start-up is simulated and analyzed by using the Newmark method to solve the equations.The results show that the unbalanced response of the high-speed long spindle system meets the requirements after the structural parameters are selected,which indicates the correctness and effectiveness of the analysis and design method of this paper.The research work reveals the dynamic characteristics of the high-speed long spindle system during the start-up phase and the key factors affecting its stable operation,and the results can provide some theoretical guidance for the independent development of highspeed spindle winding in China. |
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