Application of QFT to the problem of failed in-flight controllers during approach and landing of a B-720 aircraft

H. Chou, D. Biezad
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引用次数: 1

Abstract

Previous studies by NASA Dryden have shown the use of throttles for emergency flight control to be extremely difficult, especially for landing. Flight control using only the throttles to achieve safe landing for a large jet transport airplane, the Boeing 720, is investigated using quantitative feedback theory. Results are compared to an augmented control developed in a previous study. The controller corrects unsatisfactory open-loop characteristics by increasing the system bandwidth and damping, but improvement of the control bandwidth remains very difficult. The pitch controller is robust when turbulence is absent or moderate. The roll controller performs well in the absence of turbulence, but is sensitive to moderate turbulence. Handling qualities of the augmented control for approach and landing were evaluated by piloted simulation flights.<>
QFT在B-720飞机进近和降落过程中控制器失效问题中的应用
美国宇航局德莱顿先前的研究表明,使用节流阀进行紧急飞行控制是极其困难的,特别是在着陆时。采用定量反馈理论研究了大型喷气式运输机波音720仅使用节流阀实现安全着陆的飞行控制。结果与先前研究中开发的增强控制进行了比较。控制器通过增加系统带宽和阻尼来纠正不理想的开环特性,但提高控制带宽仍然非常困难。当湍流不存在或适中时,俯仰控制器具有鲁棒性。横摇控制器在无乱流时表现良好,但对中度乱流较为敏感。通过仿真飞行对增强控制的进近和着陆操纵质量进行了评价。
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