Design And Mechanical Properties Of Lightweight UAV Retractable Landing Gear Based On SMA Locking Mechanism

The landing frame device is essential for the safe operation of drones.Its performance can ensure the stability and reliability of drones during take-off and landing,so it has an irreplaceable effect.With the rapid development of drone technology,the demand for the performance of drones is also increasing.The main function of the drone’s landing gear is to support the weight of the drone.During the gliding and running process Establish impact to ensure the safety of drones.This article takes the designs of the survey drone to take off the design as the starting point.By checking the relevant documents of the UAV landing gear,the various structural forms and layout forms of the lightweight drone set up,and the design of the drone based on shaped memory alloy alloys is designed.The landing gear unlocked the release device,established a three-dimensional model,checked the key components of the landing gear,and analyzed the static.At the same time,the simulation results were analyzed.The main content of this article is as follows:In terms of the selection of the ups and downs architecture,the two types of drone landing frame structures are analyzed and discussed for the work characteristics of investigating drones and the design requirements of drones.The three layout forms of the landing gear are compared with the disadvantages and disadvantages,which are bicycle type,first three-point,and latter three-point formula.Finally,the drone and landing architecture are selected as the first three-point revenue form.In terms of the design of the landing gear unlock and release device,the shape memory effect of the shape memory alloy is preferred,and the three shape memory alloy drives of constant loads,linear variable loads and mutant loads are discussed for their performance.The structural characteristics of the falling frame are designed to unlock the release device of the shape memory alloy,establish the three-dimensional model of the device,analyze the unlocking and locking process of the locking mechanism,and analyze the unlocked and power-powered performance of the unlocking and release device.In terms of the designs of the landing rack parameter,first analyze the landing process of the drone.Based on the characteristics of the investigation of the drone,the overall layout parameters of the drone’s landing frame are designed.Corner,front angle,landing frame height and main wheel distance.Based on ADAMS analysis software,a sports analysis was performed.In terms of key components,the intensity school verification is performed on the wheel axis of the landing frame,starting from the design requirements of the wheel shaft and analysis of landing force,calculating the landing wheel axis load,and performing stress analysis and intensity calculation.In terms of the static analysis of the landing gear finite element,the basic principles of the finite element method are first introduced.From the establishment of the geometric model,the identification of the material,the grid division,the boundary conditions and the load,the landing frame finite element model is established.The deformation of the landing gear and the maximum stress load under the working conditions is solved,and the analysis of the solution results is analyzed.The deformation and maximum load of the landing rack under the three types of operating conditions meet the requirements.