计算机科学 ›› 2020, Vol. 47 ›› Issue (3): 237-241.doi: 10.11896/jsjkx.190200371
赵敏,戴凤智
ZHAO Min,DAI Feng-zhi
摘要: 无人机飞行受到气动阻尼扰动,从而导致控制稳定性不好。当前采用翼型截面气动参数调节的方法进行无人机抗扰控制,以扭角以及振动方向等参数为约束指标,参数调节的模糊度较大,对气动姿态参数调节的稳定性不好。文中提出基于气动参数调节的无人机抗扰动控制算法。该算法根据无人机的飞行工况构建各阶模态对应的气弹耦合方程,在速度坐标系、体坐标系、弹道坐标系三维坐标系下构建无人机的飞行动力学和运动学模型;采用卡尔曼滤波方法实现对无人机飞行参数的融合调节和小扰动抑制处理,并采用末端位置参考模型进行无人机飞行轨迹的空间规划设计;在卡尔曼滤波预估模型中实现对动力学模型的线性化处理,采用气弹模态参数识别方法进行无人机的飞行扰动调节;将姿态控制作为内环,获得位置环状态反馈调节参数;以无人机的升力系数和扭力系数作为气动惯性参数进行飞行姿态的稳定性调节,从而实现无人机抗扰动控制律的优化设计。采集飞机的俯仰角、横滚角和航向角作为原始数据在Matlab中进行仿真分析,仿真结果表明,采用所提方法进行无人机抗扰动控制的稳定性较好,对气动参数进行在线估计的准确性较高,航向角误差降低12.4%,抗扰动能力提升8dB,收敛时间比传统方法缩短0.14s,无人机飞行的抗扰动性和飞行稳定性得到提高。所提方法在无人机飞行控制中具有很好的应用价值。
中图分类号:
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