Structural Analysis And Optimization Design Of The Parachute Mechanism Of The UAV Recovery System

In order to improve the reliability and safety of the parachute recovery UAV recovery process,this article proposes and designs a parachute recovery UAV guided parachute launch mechanism,using Design-Expert software to analyze the structure parameters of the mechanism,and Based on this,the second-order response surface approximate model of the parachute mechanism's working process is established.In order to meet the target of ejection velocity and other parameters required for recovery,the main structural parameters of the ejection mechanism are optimized and the optimal solution is obtained.Aiming at the problem of the passability of the parts between the cylinders,the minimum clearance between the parts to ensure the passability under different machining accuracy levels is analyzed.Through ADAMS software,a virtual prototype model of the parachute mechanism is established.The parachute shooting process under the condition of deviation is analyzed,and the gap between the parachute bag and the guide tube is determined accordingly.The simulation results show that when there are thrust eccentricity,mass eccentricity,and position eccentricity,the designed guide tube has a good guiding effect on the parachute bag.Then,the impact force generated by the parachute mechanism under different buffering modes is analyzed,and the honeycomb cushion is designed for the parachute mechanism accordingly.The structural rigidity of the parachute mechanism is analyzed through the ABAQUS software.the rigidity of the parachute mechanism can meet the impact phenomenon generated in the working process after the buffer is added.The designed buffer has Good energy absorption effect,greatly reducing the impact effect of parachute mechanism.Then,the designed honeycomb cushion is further analyzed,and the energy absorption performance of the cushion under different honeycomb cell wall thickness and cushion stroke is analyzed.The analysis results show that the energy absorption performance of the buffer can meet the needs of the parachute mechanism,and the structural size of the buffer can be further optimized within a certain range.The above research on parachute mechanism can provide certain reference for the design of UAV recovery program.