Study on Aerodynamic Optimization Design Method Analysis and Control Algorithm of the Pod

Based on the use and function of the airborne pod, the stability and tracking accuracy indexs are the guarantee of obtaining high-quality images under the flight environment, and also a premise of successfully completing various tasks. Aiming at the aircraft subsonic pod in high-speed flight environment, in order to achieve full spectrum segment detection, the pod adopts the open form to complete pointing and tracking functions through the two-dimensional command motion of the pendulum mirror in the head of the pod. In this paper, the coupling relation, which is aircraft disturbance conversion to the pendulum mirror, is analyzed firstly. Then according to the difficulties about the control of the pendulum mirror in high-speed flight caused by the wind resistance, Reynolds average method and large eddy simulation method are used to calculate the fluid simulation, and the traditional response surface method and the concomitant method based on the control theory are adopted to optimize the shape design of the aerodynamic cover and the open cabin. On the basis of optimization, an acceleration ring is introduced into the control loop to improve the response speed and cope with the adverse torque disturbance environment caused by the window opening. Finally, the control loop is simulated in the Simulink environment. The results show that the stability accuracy of system is 0.1366mrad ( RMS), which can be applied to existing mounted pods.