This paper studies the optimal landing trajectory and control strategy for helicopter in tail rotor pitch lockup. A flight dynamics model of a single rotor helicopter with a tail rotor is established. The optimal safe landing and control problem is formulated into a nonlinear optimal control problem, and solved numerically using direct multiple shooting and sequential quadratic programming algorithms. The optimal safe landing process and control strategies for the sample helicopter encountering high tail rotor pitch lockup and low tail rotor pitch lockup are investigated respectively. Simulation results show that when the tail rotor is stuck at high pitch, it provides a large lateral force, which is beneficial for a high-power state landing with low forward speed and descent rate. When the tail rotor is stuck at low pitch, it provides a small lateral force, which is beneficial for flying at an economic speed (low-power state), but is not conducive to a safe landing afterwards. If a conventional landing is attempted in this situation, the yaw rate at touchdown would be very high and could be dangerous. If an autorotation landing is applied, the landing will be safer with a much lower yaw rate at touchdown.
Landing Trajectory and Control Optimization for Helicopter in Tail Rotor Pitch Lockup
Lect.Notes Computer
International Conference on Intelligent Robotics and Applications ; 2023 ; Hangzhou, China July 05, 2023 - July 07, 2023
2023-10-16
12 pages
Article/Chapter (Book)
Electronic Resource
English
Helicopter , Tail rotor pitch lockup , Flight dynamics model , Optimal control , Autorotation Computer Science , Artificial Intelligence , Software Engineering/Programming and Operating Systems , Computer Applications , User Interfaces and Human Computer Interaction , Computer Communication Networks , Special Purpose and Application-Based Systems
Helicopter autorotation landing trajectory optimization after tail-rotor total failure
British Library Online Contents | 2018
|Unmanned helicopter tail rotor pitch adjustment control structure
European Patent Office | 2021
|