大型运输机重型货物连续空投控制律设计及仿真

Design and simulation of control law for large transport aircraft with heavy cargo continuous airdropping

重型货物连续空投时,货物在舱内移动以及离机瞬间会导致运输机模型发生变化,严重影响运输机的稳定性和安全性。针对这一过程,设计了隐式增量形式的动态逆空投控制律。首先,根据奇异摄动分层理论将飞机状态变量分为4层;然后,利用隐式动态逆方法由内到外对各回路分层设计控制律。控制律中引入状态速率的反馈,而不显含非线性直接状态反馈,提高了控制律的鲁棒性。对某型运输机进行了连续空投的数值仿真,结果表明,所设计的控制律能保证飞机平稳、安全地飞行,在飞机模型存在气动参数摄动的情况下,仍具有良好的鲁棒性。

When the transport aircraft with heavy cargo continuous airdropping,its mathematical model changes when the cargo is moved in the hold and at the moment when it is dropped,which would tremendously affect the stability and safety of the transport aircraft. Thus,the incremental version implicit NDI control law is designed to solve this problem. Via the singular perturbation theory,the state variables of the aircraft are separated into four subsystems. Then,the control law for each loop is designed respectively from inner to outer loop via the implicit NDI method. The designed control law uses the state acceleration feedback rather than the nonlinear direct state feedback,which improves the robustness of the control law. The simulation results of the transport aircraft with heavy cargo continuous airdropping show that the designed control law can guarantee the stability and safety of the aircraft. Moreover,the control law still has great robustness against aerodynamic parameter perturbation.