In context
By mid-2025, tilt-rotor unmanned aerial vehicles (TRUAVs) were gaining traction as key platforms for low-altitude logistics and inspection, with eVTOL concepts from manufacturers such as Archer Aviation, Vertical Aerospace, and domestic AG-EX highlighting their potential. However, the transition between rotor and fixed-wing modes posed significant control challenges due to rapid model changes and rotor/wing interference, making robust flight control a critical research focus.
What was reported
Researchers from the National University of Defense Technology and a PLA unit proposed a hybrid control algorithm that integrates model-calibrated model predictive control (MPC) with PID for height and attitude control during the transition mode of a tilt-rotor UAV. The approach addresses uncertain dynamics, including rotor/wing interference and model variations, by estimating them offline and incorporating them into the MPC design.
The controller uses a parallel structure where MPC augments the PID loops, with a weighting mechanism that iteratively increases the MPC's contribution to improve tracking accuracy. The dynamics model covers a multi-rotor configuration with four front and one rear propeller, and the control framework includes a speed-dependent weight to blend rotor and fixed-wing controllers.
Validation was performed in a Matlab + X-Plane simulation environment and through flight tests on a tilt tri-rotor prototype. Comparative results indicated that the hybrid method effectively improved dynamic characteristics during transition, outperforming conventional PID control.
Why it mattered
This work demonstrated a practical pathway to enhance stability and control quality in tilt-rotor UAVs during the most challenging flight phase, potentially accelerating their deployment in industrial applications such as urban air mobility, remote inspection, and cargo transport where reliable transition is essential.
"By comparing the results with PID control algorithm, it is shown that the proposed control method can effectively improve the dynamic characteristics in the transition mode of TRUAVs."
Source: 《机器人》期刊 (robot.sia.cn) · Published 2025-06-09 · “基于模型校正MPC和PID混合控制的倾转旋翼无人机过渡模态飞行控制方法”