大柔性飞机着陆响应抑制技术研究OA

Modern large airliners and high-altitude unmanned aerial vehicles predominantly utilize high aspect ratio wings.Aircraft equipped with high aspect ratio wings can effectively reduce energy consumption;however,due to their structural characteristics,they experience considerable deformation under the influence of gravity and aerody-namic force.In order to investigate the landing response characteristics of a large flexible aircraft,a comprehensive landing dynamics model is developed,taking into account the flexibility of the airframe.This model is based on a high aspect ratio UAV as a reference sample and is integrated with a finite element model of the airframe.The anal-ysis is focused on the effects of the elastic modes and the initial attitude angle of the airframe on the landing loads and the dynamic response of the wings.Utilizing the response surface method,a surrogate model is created to opti-mize the parameters of the landing gear buffers.The results indicate that the main factor affecting the landing perfor-mance of aircraft is the first-order mode of the airframe;the large initial attitude angle of the airframe will lead to the increase of the landing load and dynamic response of the aircraft wing,and increase the risk of the wing tip touching the ground;for large flexible aircraft,Appropriately increasing the design stroke of landing gear shock ab-sorbers can help simultaneously reduce landing loads and the dynamic response of wings.