Mechanical Analysis And Load System Design Of Tethered Floating Platform

With the gradual deepening of informatization in various fields.Urban monitoring,emergency communications,disaster rescue,military early warning,border patrol and other fields have increasingly higher requirements for communication systems.Traditional ground facilities have a small coverage area for a single device,resulting in a large number of devices and high construction costs.The development potential is gradually approaching the limit.In terms of satellites,due to factors such as orbital capacity,space junk,usage cost,and flexibility of equipment layout,it is difficult to meet complex and changeable short-period application scenarios.Therefore,in order to meet the increasing communication demand,people urgently need to find a communication platform that can be independent of satellites and traditional ground equipment.Because of its high cost performance,wide coverage and flexible deployment,floating platforms are being valued by more and more countries as an effective supplementary means of communication.According to different working spaces,floating platforms can be divided into two categories: adjacent space(20km-100 km above sea level)platform and near-earth space(flying height 1km-2km)platform.Compared with satellites,the research on the development and utilization of adjacent space is in its infancy,which leads to a broad space for development.The adjacent space platform is powered by solar energy,with autonomous flight and wireless communication functions.Near-Earth space platforms are generally tethered,have no autonomous flight function,and use ground facilities for power supply.The near-ground floating platform carrying the work load can play the role of "ultra-high tower and ultra-low satellite".At present,related researches on floating platforms in military and civilian fields have been widely carried out at home and abroad.The high cost and complex operation make it difficult to test and verify the floating platform during the research process.In the past research process,most of them only conducted theoretical research on limited functional modules,resulting in scattered research work,lack of experimental results,and lack of systematic research results.This subject conducts systematic research on the design of the capsule structure,the mechanical analysis of the platform and the design of the load system during the development of the tethered floating platform for urban monitoring.The shape of the platform is a mature and universal drop-shaped captive balloon.The size of the platform is determined according to the task indicators and the capsule curve equation set.Use NX11.0 software to build the platform design model.Combining material properties and modeling results to calculate platform center of gravity,volume,buoyancy center and other data.Establish the static balance equation set when the platform bears the horizontal wind in the longitudinal plane to reach the equilibrium state,and calculate the optimal pitch angle and the corresponding relationship between the horizontal drift and the pitch angle.The design scheme of the mooring point is proposed and its stability is analyzed.According to the position of the mooring point and the platform’s stress condition,the cable structure is designed,and the mechanical calculation and rope selection are carried out.On this basis,the design of the gripper structure is proposed and its carrying capacity is compared and demonstrated and experimentally tested.According to the task load and anchoring requirements,the design indicators of the pod pylon,the binding structure and the nose cone structure are determined and the corresponding design schemes are proposed.Finite element analysis was used to verify the carrying capacity of the pod pylon and nose cone structure,and the comparison method was used to demonstrate the carrying capacity of the binding structure.Real-time measurement of platform pitch angle,roll angle and cable tension during actual operation.The measurement results and actual use effects prove that: in the design process of the platform and load system,the analysis method is reliable,the calculation result is accurate,the design plan is reasonable,the performance of the platform and load system is stable and reliable,and meets the actual use requirements.