三轴机载光电系统的模糊滑模鲁棒控制方法

Fuzzy sliding mode robust control method for a three-axis airborne optoelectronic system

为了克服机体振动和气流扰动对三轴机载光电系统对准精度的影响,提出了一种模糊滑模鲁棒控制方法。首先根据坐标转换关系建立了三轴机载光电系统的数学模型,然后引入模糊算法准确估计干扰大小,并设计了模糊滑模鲁棒控制律,最后给出了稳定性分析,能够确保三轴机载光电系统对目标方位的高精度跟踪。仿真结果表明:提出的方法与分数阶控制方法相比,表现出了更优的控制效果,可在300 ms内稳定跟踪指令信号,最大干扰估计误差仅为0.2 N·m,且具有更高的控制精度,对俯仰角、滚转角和航向角的最大跟踪误差分别仅为0.5°、0.7°和0.4°,大幅提高了三轴机载光电系统的对准精度。

To overcome the influence of body vibration and airflow disturbance on the alignment accuracy of the three-axis airborne optoelectronic system,a fuzzy sliding mode robust control method was proposed.First,the mathematical model of the three-axis airborne optoelectronic system was established according to the coordinate transformation relationship.Then,the fuzzy sliding mode robust control law was designed by introducing a fuzzy algorithm to estimate the interference value.Finally,the stability analysis was given,which can ensure that the three-axis airborne photoelectric system has high-precision tracking for the target orientation.The simulation results show that the proposed method has a better control effect than the fractional order control method,can track the command signal stably in 300 ms,and the maximum interference estimation error is only 0.2 N·m and has higher control accuracy,the maximum tracking error of pitch angle,roll angle and heading angle is only 0.5°,0.7°and 0.4°,respectively,which greatly improves the alignment accuracy of the three-axis airborne optoelectronic system.