Rotorcraft lateral-directional oscillations: the anatomy of a nuisance mode

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dc.contributor.authorAgarwal, Dheeraj
dc.contributor.authorLu, Linghai
dc.contributor.authorPadfield, Gareth D.
dc.contributor.authorWhite, Mark D.
dc.contributor.authorCameron, Neil
dc.date.accessioned2021-08-17T09:55:34Z
dc.date.available2021-08-17T09:55:34Z
dc.date.issued2021-07-22
dc.description.abstractHigh-fidelity rotorcraft flight simulation relies on the availability of a quality flight model that further demands a good level of understanding of the complexities arising from aerodynamic couplings and interference effects. One such example is the difficulty in the prediction of the characteristics of the rotorcraft lateral-directional oscillation (LDO) mode in simulation. Achieving an acceptable level of the damping of this mode is a design challenge requiring simulation models with sufficient fidelity that reveal sources of destabilizing effects. This paper is focused on using System Identification to highlight such fidelity issues using Liverpool's FLIGHTLAB Bell 412 simulation model and in-flight LDO measurements from the bare airframe National Research Council's (Canada) Advanced Systems Research Aircraft. The simulation model was renovated to improve the fidelity of the model. The results show a close match between the identified models and flight test for the LDO mode frequency and damping. Comparison of identified stability and control derivatives with those predicted by the simulation model highlight areas of good and poor fidelityen_UK
dc.identifier.citationAgarwal D, Lu L, Padfield GD, et al., (2021) Rotorcraft lateral-directional oscillations: the anatomy of a nuisance mode. Journal of the American Helicopter Society, Volume 66, Issue 4, October 2021, Article number 042009en_UK
dc.identifier.issn0002-8711
dc.identifier.urihttps://doi.org/10.4050/JAHS.66.042009
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/16997
dc.language.isoenen_UK
dc.publisherVertical Flight Societyen_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.subjectlateral-directional oscillationen_UK
dc.subjectaerodynamic couplingsen_UK
dc.titleRotorcraft lateral-directional oscillations: the anatomy of a nuisance modeen_UK
dc.typeArticleen_UK

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