Fast level-flight to hover mode transition and altitude control in tiltrotor’s landing operation  

作　　者：Ningjun LIU Zhihao CAI Yingxun WANG Jiang ZHAO 

机构地区：[1]Institute of Unmanned System,Beihang University,Beijing 100083,China [2]School of Automation Science and Electrical Engineering,Beihang University,Beijing 100083,China

出　　处：《Chinese Journal of Aeronautics》2021年第1期181-193,共13页中国航空学报（英文版）

基　　金：co-supported by the Beijing Municipal Sci-Tech Program (No. Z181100003218015);the Fundamental Research Funds for the Central Universities, China (No. YWF-20-BJ-J-542)。

摘　　要：An attempt is made to implement a faster level-flight to hover mode transition in tiltrotor’s landing process for the purpose of shortening its landing time. A three-stage tiltrotor landing maneuver is designed, and corresponding control modules and algorithms are created based on the analysis of the flight dynamics and the required actions of tiltrotor’s landing operation. As the altitude control is vital for tiltrotor’s near-ground landing, an Extended State Observer(ESO) control module of the Active Disturbance Rejection Control(ADRC) is designed to reduce altitude fluctuations in the fast mode transition, which makes the designed maneuver workable at very low altitudes. Simulations are conducted to verify the effectiveness of the designed maneuver and the validity of ESO control in various flight conditions. Flight test results that finally prove the effectiveness of the desired fast transition maneuver are reported.

关 键 词：TILTROTOR Transition Flight control VTOL UAV ADRC 

分 类 号：V279[航空宇航科学与技术—飞行器设计] V249.1