Abstract
AbstractThis paper is devoted to stabilizing the receiver subjected to the time-varying fuel mass and external airflow disturbance during aerial refueling. First, the dynamics of the variable-mass receiver with 6 degrees of freedom (DOF) are formulated by constructing a rectangular non-particle tank model to expand the constant mass receiver model. Meanwhile, for the convenience of designing the controller, the dynamics are expressed in an affine nonlinear form. Second, multiple high order sliding mode observers (HOSMO) are established for precisely estimating the lumped disturbances that contain the impact of unstable airflows and unmeasured time-varying states. Then, for compensating these estimated lumped disturbances with feed-forward control, the stabilization controller based on dynamic surface control (DSC) technology is designed. Then, the closed-loop stability of the receiver stabilization control system is proved. In the end, numerical flight simulations are presented to validata the performance of the receiver stabilization controller.KeywordsAerial refuelingVariable-mass systemDynamic Surface Control (DSC)High Order Sliding Mode (HOSM)Disturbance rejection control
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