Structural Design And Characteristic Analysis Of Supersonic Fiber-optic Take-up Wheel

The ground simulation pay-off system is used to simulate the fiber optic pay-off process of a certain type of fiber fibre-optical guidance weapon,in order to observe the motion status and signal transmission quality of the fibre-optical.The long-distance pay-off device is an important component of the pay-off system,which pulls and collects the fibre-optical released from the wire package through high-speed rotation of the take-up wheel.To simulate the motion of fibre-optical during the launch to flight phase of guided weapons,the linear velocity in the receiving groove of the fibre-optical reaches 340m/s within the specified time,and the maximum linear velocity belongs to supersonic speed.Therefore,it is susceptible to plastic damage caused by insufficient stiffness and strength due to the influence of centrifugal load.At the same time,due to high-speed rotation in the air,the take-up wheel causes severe disturbance to the surrounding air,which is subject to significant wind resistance.Under the combined action of air resistance and centrifugal load,it is easy to increase the power consumption of the take-up wheel during rotation,and due to the limitation of the rated driving power,the acceleration performance of the take-up wheel decreases,which cannot meet the simulation requirements of the fibre-optica motion state.Therefore,this article focuses on the above-mentioned issues of the supersonic fibre-optica take-up wheel,and conducts characteristic analysis and structural optimization design of the original take-up wheel from both structural and fluid aspects,in order to improve the acceleration performance of the take-up device.(1)Mechanical property analysis and structural optimization design of take-up wheel.According to the requirement of take-up performance,the static analysis of take-up wheel structure is carried out by means of finite element method,and the influence of structural dimension parameters on the quality and strength of take-up wheel is studied.The response surface method is adopted to optimize the size parameters of take-up wheel with minimum mass as the target and rigid strength as the restraint conditions.(2)Flow field simulation model of take-up wheel was established.Taking the take-up wheel with size optimization as the research object,physical parameters such as air density,viscosity and thermal conductivity are analyzed and determined when air compressibility is considered,a fluid dynamics model is established,and the meshing,boundary conditions,boundary layer treatment and simulation methods of the model are analyzed.(3)Flow field characteristics analysis of the take-up wheel.Based on windage loss of the take-up wheel and its main influencing factors,the pressure and speed distribution characteristics of steady-state flow field of the take-up wheel under supersonic condition were analyzed,and wind resistance torque and windage loss values of the take-up wheel were calculated.(4)Windage reduction scheme design of take-up wheel.Wind resistance torque of the take-up wheel is reduced by installing hub covers on both ends of the axial direction of the take-up wheel.The influence of hub covers on windage loss of the take-up wheel is analyzed.Wind resistance and power loss values of the take-up wheel during supersonic rotation under different hub covers are calculated.The optimum size parameters of the hub covers are determined and the final structure of the take-up wheel is obtained.(5)Analysis on accelerated rotation performance of take-up device shafting structure.The wind resistance torque value during the acceleration phase of the take-up wheel is calculated,and the relationship between the wind resistance moment and time during the acceleration phase is obtained by fitting.On this basis,the dynamic simulation of the shaft structure of the take-up device after the drag reduction design of the take-up wheel is carried out to obtain the rotational power consumption of the shaft structure,and the rotational stability of the shaft structure is analyzed by using the finite element method.