| In the filament winding machine, spindle, package, contact roller form a high speed flexible rotor time frequency varying system with time-varying package mass and rotating speed, parameter frequency variable, structure coupling. Dynamic problem of winding system is the key of design theory and technology of winding machine, also a major bottleneck of restricting the development of domestic winding machine. This research studied dynamics characteristics of high speed winding system based on the basic theory, expect to reveal the mechanical characteristics and the core technology of the winding machine.According to the current production process, fiber filament winding speed is as high as 6000m/min. In winding process, with the increasing of the amount of the filament winding, the package diameter gradually increase to full volume size, winding speed gradually reduce from the highest to the lowest to keep the winding speed constant. When the initial winding diameter is 105 mm, the maximum rotating speed of the spindle is 18189r/min, the contact roller diameter is 65 mm, and the maximum rotating speed is 29382r/min. The completion of a single cycle of winding would go through 5 different processes. In addition to doffing process, the remaining four processes have different dynamic characteristics. In the empty volume rapid starting-up process and full volume rotating speed down to stop process, rotating speed of spindle is time-varying, the parameter of rubber rings flexible support are frequency-induced varying, mass and moment of inertia are constant. In winding process, with the increase of package diameter, rotating speed, package mass and moment of inertia are time-varying, the parameter of flexible support are frequency-induced varying, there are rigid-flexible coupling between spindle, package and contact roller. In the empty volume maintaining the highest speed point process, spindle belongs to the flexible support rotor system with the constant parameters which is studied by most scholars at present. Obviously, the winding rotor system can be described as a complex rotor winding system with characteristics of time varying and frequency-induced varying.In this paper, the characteristics of time varying, frequency-induced varying and parameters regulation of the high speed winding rotor system had been studied.(1)Analysed the structure and composition of a typical winding machine, lighted on winding mechanism and winding process, clarified the motion characteristics and process requirements of different stages of the winding system in a single cycle.(2) First, a finite element model and corresponding dynamic equation of the rotor were established by means of Timoshenko beam element. Then, by introducing the flexible support coupling and the mutual cooperation between the components of the rotor, a finite element model and the dynamic equation of the spindle system were established. Finally, a finite element model and the dynamic equation of whole movement process of the whole winding system were established by the coupling relationship between the spindle, the package and the contact roller.(3)The dynamic parameters of the flexible support system with "O" rubber ring were obtained by using the basic excitation and non-resonance method, and it fitted frequency dependent properties curve, which lays the foundation for simulation analysis of the amplitude-frequency response characteristics of the spindle and winding system.(4)The constitution principle and process of the mass matrix and stiffness matrix of the complex rotor system formed by coupling the components were analyzed. In view of the time-frequency varying characteristics of the winding system, a method for solving the dynamic response of the system was proposed. Program composition with MATLAB of Newmark direct integral method for time-frequency varying characteristics and dynamic response of spindle and winding system was used to solve dynamic response of system.(5) A contact coupling finite element model of the contact roller and the package was established, the function relationship between the contact stiffness and the variation of filament layer was obtained, dynamic characteristics of the four processes of a single winding cycle were calculated and analyzed, and dynamic response amplitude frequency characteristic of the system under unbalanced mass excitation was revealed. From this we knew that the amplitude values of the system’s large unbalance response were in the fast start process of the spindle. So, regulation of the unbalance response should be focused on this process.(6) By adjusting the structure parameters working parameters of the winding rotor system, unbalance response of the system of parameter adjustment before and after were calculated and compared. The results show that it was feasible by effectively adjusting the relevant parameters to regulate the unbalance response amplitude of the system, and the general regulation method was given.(7) A practical winding rotor system was calculated and analyzed. First, the reason that the winding machine can not achieve the high winding speed and can only work at low winding speed was pointed out. Next, the possibility of the normal operation of the winding machine was analyzed by adjusting the working speed range. These analyses were verified by the corresponding experiments and the testing of the practical work.In this paper, there have several innovative points listing as below:(1)Taking account of the effect of time frequency varying parameters and coupling relationship between spindle, package and contact roller, a full system model was established, which can be used to analyze effectively the dynamic characteristics of the complete winding cycle of high speed winding rotor system.(2)The dynamic parameters of the flexible support system with "O" rubber ring were obtained by test, and frequency dependent properties curve was fitted. The function relationship of contact stiffness and winding layer thickness was analyzed. A numerical analysis program was developed, dynamic characteristics of full winding cycle were calculated and analyzed, which revealed dynamic response amplitude frequency characteristics of the high speed winding rotor system under the unbalanced mass excitation.(3)A method of regulating the unbalance response amplitude of the winding machine was proposed by adjusting the structure parameters and working parameters of the winding rotor system, which could effectively improve the dynamic performance of system,and would lay a solid foundation for the further optimization of kinetic parameters of high speed winding system.The research results have important theoretical significance and engineering application value for improving dynamic performance of winding machine and guiding development of the winding rotor system with independent intellectual property rights. |
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