考虑滑块动态特性的变质心四旋翼无人机双回路控制

Dual-loop control of mass-actuated quadrotor UAV considering dynamic characteristics of moving mass

针对滑块动态特性引入的附加干扰力矩造成系统姿态抖动强烈的问题,开展变质心四旋翼无人机滑块参数设计与姿态/伺服双回路控制研究。通过建立双滑块变质心四旋翼无人机八自由度运动模型,明确了滑块的引入对系统的影响,给出了与滑块动态特性相关的各项附加干扰力矩;分析并设计了滑块的安装位置、质量以及行程等参数,降低滑块对系统的耦合与干扰;最后以滑块驱动力作为控制量,设计了姿态/伺服双回路动态滑模控制器,同时利用非线性扰动观测器对复合扰动进行估计和补偿,并进行了仿真试验。仿真结果表明,在考虑滑块动态特性的情况下,所设计的控制器能够实现对变质心四旋翼无人机的姿态控制,并具有良好的抗干扰性能与鲁棒性。

The study focuses on the severe attitude jitter brought on by the extra disturbance torque generated by the dynamic properties of the moving mass.It investigates the moving mass parameter design and attitude/servo dualloop control of the mass-actuated quadrotor UAV.Firstly,the influence of the moving mass introduction on the system is clarified and various additional disturbance torque introduced by dynamic characteristics of the moving mass is given by establishing an eight-degree-of-freedom motion model of mass-actuated quadrotor UAV.Next,in order to lessen the coupling and disturbance of the moving mass to the system,characteristics including the installation position,mass,and various maximum displacements of the moving mass are examined and constructed.Finally,an attitude/servo dual-loop dynamic sliding mode controller is designed with the mass driving force as the control input,and the nonlinear disturbance observer is used to estimate and compensate for the composite disturbance.The results of the simulation demonstrate that the controller has high anti-interference performance and robustness when taking into account the dynamic features of the moving mass.It can also achieve attitude control of the mass-actuated quadrotor UAV.