A hypersonic cruise flight vehicle high-precision control method using compound rudder surface

The hypersonic vehicle usually uses all-moving wing(AMW) in order to suppress the separation perturbation . In the cruise phase, the vehicle is under the influence of the engine thus having rather low requirements for rudder surface efficiency. If an AMW is still used, its minute deflection may bring about the great change in the attitude, making it somewhat difficult in the high-precision and high stability of the control system. This paper proposes the compound rudder (CR) to control the hypersonic vehicle. Then, on the basis of AMW, it optimizes the boundary dimensions of its compound rudder surface and its control law with the Concurrent Subspace Optimization (CSSO) of the multi-objective genetic algorithm. Under the gust perturbation, the paper perform the simulation of the flight vehicle's capability to suppress perturbation in the cruise flight process. The simulation results show that the CR can effectively reduce the influence of gust perturbation on the attitude of the hypersonic vehicle, overcome the influence of the dead zone and gap of the rudder and reduce the fluctuation of the attitude of the hypersonic vehicle, thus providing a new method for its high-precision attitude control in the cruise phase.