关键词: 变体飞行器, 线性变参数模型, 线性矩阵不等式, 滑模控制, 容错控制

Abstract: A sliding mode fault-tolerant control method based on polytopic linear parameter-varying (LPV) model is proposed to address the problems of the matched disturbances and actuator multiplicative failures of morphing aircraft during the flight process. The longitudinal nonlinear dynamics model of morphing aircraft undergoing wingspan deformation is presented, which is used for obtaining an LPV model of morphing aircraft. Then, the LPV model of morphing aircraft is transformed into the polytopic form, which can convert the infinite-dimensional linear matrix inequality (LMI) problem into the finite-dimensional LMI problem. To ensure the stability and robustness of morphing aircraft when the system actuator fails, a gain-scheduled fault-tolerant control algorithm is proposed by selecting a suitable sliding mode surface and designing a sliding mode fault-tolerant control law. The designed controller is applied to morphing aircraft for simulation verification. The simulation results show that the designed controller can ensure the stability and anti-interference ability of the closed-loop system when the actuator fails.

Key words: morphing aircraft, linear parameter-varying model, linear matrix inequality, sliding mode control, fault-tolerant control