Identification of Helicopter Rigid Body Dynamics from Flight Data.
Abstract
This paper discusses helicopter modelling and identification related aspects. By applying thesystem identification methodology, longitudinal and lateral-directional rigid body helicopter dynamics are identified from flight data. Aerodynamic parameters from single input excitation as wellas multimanoeuver evaluation are estimated utilising output-error approach. The formulatedmathematical models yield adequate fit to measured time histories. Results obtained from the proof-of-match for model validation indicate that the identified derivatives can satisfactorily predictlongitudinal dynamics to a given arbitrary input. It is further demonstrated for the present study thatlateral body dynamics can be adequately predicted by including cross-coupling terms in the estimation model.References
Klien, V. Estimation of aircraft aerodynamic parameters from flight data, Prog. in Aero. Sci. ,
,26,1-77.
Maine, R.E. & Iliff, K. W. Application of parameter estimation to aircraft stability and
control. NASA, Washington, DC, 1986. NASA RP-1168.
Iliff, K. W. Parameter estimation of flight vehicles. .1: Guid., ConI. Dyn., 1989, 12(5),
-22.
Kaletka, J. Rotorcraft system identification, NA TO, 7 rue Ancelle, 92200 Neuilly sur Seine,
France, 1991, AGARD-AR-280.
Girija, G.; Saraswathi, L. & Raol, J.R. Estimation of. stability and control derivatives of a helicopter from flight data -preliminary results. National Aerospace Laboratories, Bangalore, 1994. Report No. NAL PD-FC-9406.
Molusis, J.A. Rotorcraft derivative identification from analytical models and flight test data.
AGARD, France, 1974. Report No. AGARD-CP-172, pp. 24-1 to 24-3l.
Fu, K.H.; Kaletka, J. & Plaetschke, E. Frequencydomain method applied toBO 105 flight test data. Proceedings of NAL-DLR Symposium on System Identification, 1993. Report No.
NAL-SP-93.
Hansford, R.E. & Sirnons, I.A. Torsion-flap-lag coupling on helicopter rotor blades. J A mer.
Heli. Soc., 1973,18(4),2-12.
Kaletka, J. Rotorcraft identification experience. NA:TO, 7 rue A:ncelle, 92200 Neuilly sur Seine, France, 1979, AGARD-LS-104.
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