Control law design for handling qualities improvement and structural load alleviation in rotorcraft

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Proceedings title2007 European Control Conference, ECC 2007
Conference2007 9th European Control Conference, ECC 2007, Kos, Greece, July 2-5, 2007
Article number7068912
Pages39934000; # of pages: 8
SubjectAircraft control; Bandwidth; Control theory; Flight control systems; Helicopters; Identification (control systems); Structural loads; Accurate prediction; Control law design; Flight mechanics; Handling quality; Linearized models; Load alleviation; Nonlinear elements; Time domain system identification; Quality control
AbstractRecent results are presented on the modelling, control and identification of helicopters carried out under the Helicopter Active Control (HELI-ACT) project. Designing high-bandwidth control systems pushes the existing flight mechanics models to their limits, especially if structural load prediction and alleviation are to be investigated. We describe how engine dynamics have been added to the simulations we have developed and how time-domain system identification has been used to obtain an updated linearized model. This has been done in an effort to address deficiencies that were observed in the original models. The use of nonlinear elements is discussed in the context of optimizing handling quality metrics. Results are presented from the flight-test of control laws incorporating nonlinear elements, designed to optimize attitude quickness, and it is shown how extremely accurate predictions of bandwidth and quickness were made using the new model.
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AffiliationNRC Institute for Aerospace Research; National Research Council Canada
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Peer reviewedYes
NRC numberFRL-2007-0049
NPARC number8930659
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Record identifierff33dce9-fb79-44fa-8a41-04dc570f1be4
Record created2009-04-23
Record modified2016-05-09
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