Analysis of longitudinal controllability and stability of oblique wing morphing aircraft
A class of oblique wing morphing vehicle is taken as the research object,and the effects of morphing on aerodynamic characteristics,motion state,controllability and stability are analyzed.The Newton-Euler method is used to establish a multi-rigid-body longitudinal dynamic model of the vehicle,which highlights the model differences arising from the oblique wing morphing.Based on the dynamic model,the influence of the oblique wing morphing on the aerodynamic characteristics and motion state of the vehicle is investigated.The longitudinal controllability and stability of the ve-hicle are analyzed by combining with the aerodynamic data of the vehicle.The results show that for the oblique wing vehicle whose overall center of mass of the wing and the center of mass of the fuse-lage are coincident in the x1O1z1 plane,the rotational morphing of the wing produces only additional moments around the z-axis direction,and the total additional force is zero;the morphing process changes the position of the aerodynamic center,which produces the static instability of the vehicle;and the value of damping coefficient in the transfer function of rudder deflection in different states of the vehicle is too small,which leads to abnormal overshoot and adjustment time of the vehicle in all flight states and needs to be corrected.
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