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LPV Model-based Adaptive MPC of an eVTOL Aircraft During Tilt Transition Subject to Motor Failure
Shen Qu,Guoming Zhu,Weihua Su,Sean Shan-Min Swei 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.2
This paper applies novel LPV (linear parameter-varying) model and MPC (model predictive control) methods to a tilt-transition process with rotor failure for electric vertical take-off and landing aircraft of six distributed electric rotors with a fixed-wing for level flight, where two rotors are tiltable to generate variable thrust vector during the tilt-transition from hovering to steady-state level flight and the rest of four cannot be tilted. During the level flight, the aerodynamic lift induced by fixed wing maintains flight altitude. Based on a predefined nominal tilting trajectory scheduled by tilt-rotor angular position and the failed rotor speed, a discrete-time LPV model is constructed based on significantly reduced number of linear time invariant models obtained by linearizing the nonlinear eVTOL aircraft model along the tilting trajectory, where tilt-rotor angle and failed rotor speed can be measured in real-time. An LPV modeling error evaluation method is proposed based on the σ shifted H2 norm, and adaptive model predictive controller is designed with the dynamic reference compensation. Simulation study indicated the success of the adaptive MPC strategy based on tilt-transition LPV model with rotor failure.
Nonlinear Dynamic Analysis of Fiber Movement
Shen Danfeng,Ye Guoming The Korean Fiber Society 2006 Fibers and polymers Vol.7 No.2
This paper adopts nonlinear vibration method to analyze the fluctuation process of fiber movement. Based on Hamilton Principle, this paper establishes differential equation of fiber axial direction movement. Using variable-separating method, this paper separates time variable from space variable. By using the disperse movement equation of Galerkin method, this paper also discusses stable region of transition curve and points out those influencing factor and variation trend of fiber vibration.