变外形航弹离散滑模BTT自动驾驶仪设计*

为提高变外形航弹BTT控制系统对弹翼作动影响的鲁棒性能,提出了一种基于离散滑模控制原理的BTT自动驾驶仪设计方法。建立了航弹BTT控制仿射模型,针对该模型中存在的时变特性与耦合问题,通过反馈线性化方法对原系统进行解耦并离散化处理,将由后掠角采样值误差引起的各动力学系数偏差项作为模型不确定扰动,设计了变外形航弹的离散滑模BTT自动驾驶仪。仿真结果表明,所设计的离散BTT控制系统实现了各通道的解耦控制,对时变参数摄动具有良好的鲁棒性能,验证了对指令跟踪的动态延迟和误差与采样周期有关,实际选取时需综合考虑实际硬件性能与期望的指令跟踪精度要求。

BTT Autopilot Design for Morphing Aerial Bombs Based on Discrete-time Sliding Mode Control

In order to improve the robust performance of BTT control system within the morphing phase, a BTT autopilot design for the morphing aerial bombs based on the discrete-time sliding mode control principle is proposed. The BTT control affine system is modeled. Meanwhile, aiming at the time-varying and coupling characteristics, input-output feedback linearization is utilized to decouple the system into three independent discrete-time subsystems. Regard aerodynamic coefficient deviation items caused by measuring and changing of the sweepback as the external uncertain disturbances, a discrete-time sliding mode BTT autopilot for the morphing aerial bombs is designed. The simulation results indicate that the discrete-time control system proposed is robust to the large-scale aerodynamic parametric perturbations engendered by wings morphing and realize the decoupling control among channels. The tracking delay and errors are related to the sampling period, therefore, the actual hardware performances and command tracking accuracy should be considered in selecting sampling period.