Adaptive attitude control of rigid-elastic coupling launch vehicle based on rate gyro weighting

In this paper, the problem of adaptive attitude control is studied for a rigid-elastic coupling launch vehicle based on rate gyro weighting. Firstly, an attitude tracking error dynamics model is established, which contains multiple rate gyros that are arranged at different positions of the rocket body. Subsequently, a rate gyro adaptive weighting method is proposed to reduce the elastic vibration signals entering the control loop. Then, a novel adaptive filter network is designed to correct the attitude angle channel and the rate channel separately. The network can adaptively adjust the relevant parameters according to the frequency identification results to ensure the stability of the elastic modes. Finally, a control gain adaptive adjustment method is proposed to enhance the adaptability of the controller to different parameter deviations. The simulations demonstrate that the proposed method successfully realizes the attitude tracking of rigid-elastic coupling launch vehicle, and can be applied to the case where the rigid body and elastic parameters have deviations.