一种高超声速试飞器助推段主动弹性抑制方法

Active Elastic Control for Boost Stage of a Hypersonic Test Vehicle

针对高超声速试飞器助推段由于其高静不稳定特性所引起的低频弹性模态与刚体高带宽控制之间动态耦合问题,具有低频模态和大静不稳定度等特征,引入主动弹性抑制技术,即在传统控制器的设计基础上引入弹性振动能量在线辨识技术相结合的改进自适应增广控制技术(Adaptive augmenting control,AAC),动态改变开环系统控制增益,以降低弹性模态对舵机的影响,同时增加刚体控制系统的稳定性。仿真结果验证了该方法能够有效减小由干扰激励出的弹性模态所引起的附加舵机摆角,抑制伺服弹性耦合作用。该方法对高超声速试飞器助推段的控制具有重要的理论意义和工程应用价值。

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.