一种飞机低空下滑定高控制方案改进设计及仿真

Improvement Design and Simulation on the Control Scheme of Aircraft Sliding Down to Fixed Height Control System at Low Altitude

飞机低空下滑定高飞行是飞机着陆飞行阶段中的重要一环,其下滑改平飞行轨迹的优劣及轨迹控制精度的高低对飞机的安全着陆至关重要。为此设计了一种低空下滑定高控制方案,即：内回路采用均衡式反馈舵回路,外回路加入俯仰角信号＋延迟接入高度定高系统的控制方案。为验证该结构方案的准确性,对其作了大量仿真研究,仿真结果显示,所设计的结构方案及其控制规律可使下滑定高控制系统的动、静态性能得到明显改善。

A sliding down to fixed height system was designed and the structure control program that if the pitch angle control signal is joined first, further a high stability system is accessed, was analyzed and simulated. First, mathematic model and its structure graph were established of the system, and simulation was carried on for the system. It was found that from the results, the system＇s dynamic and static state performance can＇t satisfy design needs, and its control laws must be optimized. Second, to achieve the anticipate requirements, control laws was optimized with methods of transmission ratio designed equitably and balanced rudder feedback loop led into.