大型运输机超低空空投拉平阶段轨迹控制  

Trajectory Control During Ultra-Low-Altitude Airdrop Process of Large Transport

作　　者：吕茂隆 孙秀霞[1] 王栋[1] 刘日[1] 

机构地区：[1]空军工程大学航空航天工程学院,陕西西安710038

出　　处：《计算机仿真》2016年第4期85-90,共6页Computer Simulation

摘　　要：大型运输机超低空空投精度控制的研究中,超低空空投拉平阶段是强耦合性、强非线性的一个过程,若操纵不当,系统产生震荡,极易引发PIO问题。为解决超低空空投拉平阶段由舵机速率限制引起的非线性PIO问题,首次采用了带反馈和旁通FWB(Feedback-with-Bypass)抑制器进行抑制。在建立非线性人机闭环系统模型基础之上,采用阶跃、离散俯仰和正弦跟踪任务在时域内对PIO抑制效能进行了研究,分析了FWB抑制器时域特性及其相位补偿能力。最后,基于"matlab/simulink—多轴变稳大型运输机地面飞行模拟器"进行验证,结果表明:FWB抑制器对空投拉平阶段轨迹能进行有效控制,能达到抑制PIO效果,显著改善飞机飞行品质。Ultra - low - altitude airdrop is a process with strong coupling and nonlinearity. If it is not dealt with properly, there is a great chance to occur PIO. Aiming at the nonlinear PIO problem caused by actuator rate saturation, Feedback -with -Bypass compensator is applied to avoid PIO firstly, a nonlinear pilot -vehicle closed -loop system is established to investigate the prevention efficiency of compensator. The step, discrete and sine tracking tasks are employed to research the prevention capability of the FWB suppresser in time domain. The phase compensa- tion capability of the FWB compensator is analyzed. Finally, the effectiveness of FWB is tested by maflab/Simulink and further validated on ground - based flight simulators. The test results demonstrate that the FWB compensator can control trajectory during ultra - low - altitude airdrop process, prevent PIO and improve flying qualities of transport during ultra- low -altitude airdrop process effectively.

关 键 词：超低空空投 驾驶员诱发振荡 反馈和旁通抑制器 大型运输机地面飞行模拟器 

分 类 号：V212[航空宇航科学与技术—航空宇航推进理论与工程]