What is it about?
This work develope the control design of the Generic Future Fighter (GFF) subscale concept built by Linköping University. The GFF subscale is a radio-controlled aircraft with 14% of the size of the full-scale concept aircraft.
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Why is it important?
The Linear Quadratic Regulator (LQR) are still adopted for the stability control of aircraft in flight. However the LQR method present in their classic form, limitations to incorporate performance parameters and operational restrictions in the design phase. A promising alternative to circumvent this problem is the use of Linear Matrix Inequalities (LMIs) as a tool to convert stability and control problems into optimization problems. This work presented an LQR-LMI formulation to simplify the determination of a single feedback gain matrix that guarantees the stability and keeps the flight characteristics by varying the c.g. position.
Perspectives
The development of microelectronics combined with the cheapness of manufacturing processes has allowed the construction of subscale models equipped with sensors and control systems equivalent to a real aircraft. This work presented an LQR-LMI formulation to simplify the determination of a single feedback gain matrix that guarantees the stability and keeps the flight characteristics by varying the c.g. position. This approach proved to meet the specified operating criteria. Thus, for a more thorough evaluation, it is expected in future works the evaluation of this condition with the subscale model in real flight. I also hope this research can help to understand the flight behavior of a full-scale fighter.
LEONARDO NEPOMUCENO
Instituto Tecnológico de Aeronáutica
Read the Original
This page is a summary of: An LQR-LMI Longitudinal Stability Augmentation System for a Subscale Fighter Aircraft with Variable Center of Gravity Position, June 2022, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2022-4059.
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