| Citation: | CHEN Jinhe, WANG Zhengzhong, MA Yujieet al. Research on low-speed avoidance zone of tiltrotor[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(11): 2184-2192. doi: 10.13700/j.bh.1001-5965.2019.0071(in Chinese)
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This paper focuses on the analysis and prediction of the height-velocity low-speed avoidance zone of tiltrotor based on the idea of minimizing avoidance zone, aiming at improve the safety of tiltrotor aircraft in one/all engine inoperative (OEI/AEI). First, mixed control model is introduced to establish an augmented longitudinal two-dimensional rigid-body flight dynamic model after engine failure of tiltrotor. Second, Based on the optimal control theory, the boundary of avoidance zone is transformed into a safe landing problem, then a continuous nonlinear optimal control model of tiltrotor for landing safely after engine failure is established, solved it by discontinuous finite element method (DPG) and nonlinear programming algorithm. Finally, Using XV-15 as the sample vehicle, the accuracy of the algorithm is verified. And the height-speed avoidance zone under different flight weight or control restraint after one/all engine inoperative was studied, the influence of nacelle on the low-speed avoidance zone is analyzed, the maximum safe gross weight suggested for XV-15 during vertical operation is given after one engine failure.
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