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Particularities of Rotorcraft in Dealing with Advanced Controllers
- Source :
- INCAS Bulletin, Vol 16, Iss 2, Pp 85-97 (2024)
- Publication Year :
- 2024
- Publisher :
- National Institute for Aerospace Research “Elie Carafoli” - INCAS, 2024.
-
Abstract
- Advanced nonlinear controllers are a desirable solution to rotorcraft flight control as they can solve the system high nonlinear dynamic behavior. However, conventional nonlinear controllers such as Nonlinear Dynamic Inversion (NDI) controller heavily rely on the availability of accurate model knowledge and this can be problematic for rotorcraft. Therefore, incremental control theory can solve the modelling errors sensitivity by relying on the information obtained from the sensors instead. The paper applied the Incremental Nonlinear Dynamic Inversion (INDI) controller to rotorcraft case. It will be demonstrated that, for rotorcraft, the incremental nonlinear controllers depend on the delays introduced in the controller by the rotor dynamics. To correct this behaviour, residualization and synchronization methods need to be applied accordingly in order to remove the effects of rotor flapping (disctilt) dynamics from the controller. These particularities of rotorcraft in dealing with advanced controllers shows that incremental nonlinear controllers can have relatively small stability robustness margin and careful controller design is needed in order to account properly for rotorcraft time delays and unmodelled dynamics.
Details
- Language :
- English
- ISSN :
- 20668201 and 22474528
- Volume :
- 16
- Issue :
- 2
- Database :
- Directory of Open Access Journals
- Journal :
- INCAS Bulletin
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.13f5f1a80e634c5d8b43d0774370bbc2
- Document Type :
- article
- Full Text :
- https://doi.org/10.13111/2066-8201.2024.16.2.7