一种高超声速试飞器助推段主动弹性抑制方法

The boost phase of a hypersonic vehicle has the characteristics of low frequency structure modes and large static instability. The traditional preset gain and compensation network can not simultaneously give consideration to the tracking performance of the control system and the suppression of the elastic vibration. The gain stabilization of the flexible modes will reduce the cut-off frequency, decrease the bandwidth and degrade the dynamic performance of the control system. In this paper, the active elastic suppression technology is introduced, that is, an improved adaptive augmented control (AAC) technology combined with the on-line identification of elastic vibration power is introduced into the classical control system to dynamically adjust the output of the baseline controller to reduce the influence of servoelastic coupling and to increase the stability of the rigid body control system. The simulation results verify that the proposed method can effectively reduce the extra steering angle induced by the elastic mode caused by the disturbance and suppress the servoelastic coupling effects. This method has important theoretical significance and engineering application value for the control of the hypersonic vehicle boost stage.