Rotorcraft Lateral-Directional Oscillations: The Anatomy of a Nuisance Mode

Agarwal, Dheeraj ORCID: 0000-0001-5340-5851, Lu, Linghai, Padfield, Gareth D, White, Mark D ORCID: 0000-0002-8611-9525 and Cameron, Neil ORCID: 0000-0003-0112-2926 (2021) Rotorcraft Lateral-Directional Oscillations: The Anatomy of a Nuisance Mode. JOURNAL OF THE AMERICAN HELICOPTER SOCIETY, 66 (4). pp. 1-13.

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Official URL: http://dx.doi.org/10.4050/jahs.66.042009

Abstract

<jats:p> High-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 fidelity. </jats:p>

Item Type:	Article
Uncontrolled Keywords:	rotorcraft, system identification, fidelity, Dutch roll, lateral directional osscillation, simulation, flight test
Divisions:	Faculty of Science and Engineering > School of Engineering
Depositing User:	Symplectic Admin
Date Deposited:	26 Jan 2022 10:10
Last Modified:	18 Jan 2023 21:14
DOI:	10.4050/JAHS.66.042009
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3147611