期刊
AERONAUTICAL JOURNAL
卷 125, 期 1284, 页码 341-364出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/aer.2020.85
关键词
Robust Control; Preview Control; LIDAR; Load Alleviation; Flexible Aircraft; Aeroelasticity; Flight Dynamics; Modeling and Simulation; Handling Qualities; Ride Qualities
资金
- Egyptian Ministry of Higher Education and Scientific Research
- DAAD (German Academic Exchange Service, Deutscher Akademischer Austauschdienst) via the GERLS (GermanEgyptian Research Longterm Scholarship) program
- Joint Technology Initiative JTI Clean Sky 2, AIRFRAME Integrated Technology Demonstrator platform `AIRFRAME ITD [CSJU-CS2-GAM-AIR-2014-15-01]
- CleanSky2 NACOR project
This paper proposes a methodology for designing Gust Load Alleviation systems, relying on wind profile and optimal control techniques, and introduces a variant to allow design trade-offs and specify robustness criteria. The method is intended for large aircraft, and simulation results demonstrate the effectiveness of the design methodology in considering wind profile while achieving design flexibility and controller optimality.
Turbulence and gusts cause variations in the aerodynamic forces and moments applied to the structure of aircraft, resulting in passenger discomfort and dynamic loads on the structure that it must be designed to support. By designing Gust Load Alleviation (GLA) systems, two objectives can be achieved: first, realizing higher passenger comfort; and second, reducing the dynamic structural loads, which allows the design of lighter structures. In this paper, a methodology for designing combined feedback/feedforward GLA systems is proposed. The methodology relies on the availability of a wind profile ahead of the aircraft measured by a Doppler LIDAR sensor, and is based on H-infinity-optimal control techniques and a discrete-time preview-control problem formulation. Moreover, to allow design trade-offs between those two objectives (to achieve design flexibility) as well as to allow specification of robustness criteria, a variant of the problem using multi-channel H-infinity-optimal control techniques is introduced. The methodology developed in this paper is intended to be applied to large aircraft, e.g. transport aircraft or business jets. The simulation results show the effectiveness of the proposed design methodology in accounting for the measured wind profile to achieve the two mentioned objectives, while ensuring both design flexibility and controller robustness and optimality.
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