SOLAR UAV GUST LOAD AMENDMENT

摘要

Loading analysis is the key technology inthe process of aircraft design. ForUAVs, analysis of the gust load is usuallycarried out by the Pratty method. But for thesolar UAV flight, due to low speed, lightweight,low frequency and large deformation, thevalidity of Pratty method is worth discussing.This paper took a certain kind of HighAltitude Long Endurance (HALE) UAV as anexample, briefly introduced how to calculate thestructural payloads of this UAV by means ofPratty method and calculated the structuralpayloads of the aircraft according to the designstandards of UAVs. Besides, through themethod of Dynamic analysis of structure inunsteady aerodynamic force, this paperproposed that the problems existing in thecalculation process of the UAV’s payload canbe solved by the aforesaid standards and theerror was briefly calculated and assessed.The analysis result showed that whendesigning this kind of UAV based on commonstandards, the actual structural payload wasgenerally overrated. Therefore, the UAVdesigning standards needs to be rectified basedon the structural and aerodynamicscharacteristics of this kind of UAV.