| || Identification of Helicopter Rigid Body Dynamics from Flight Data
Author : Chopra, A.K. ;Kumar, Ramesh;Chaudhary, K.L.
Source : Defence Science Journal ; Vol:48(1) ; 1998 ; pp 69-86
Subject : 533.6 Aerodynamics;629.7 Aeronautics
Keywords : Mathematical models ;Aerodynamic parameters;Directional rigid body
Abstract : "This paper discusses helicopter modelling and identification related aspects. By applying the system identification methodology, longitudinal and lateral-directional rigid body helicopter dynamics are identified from flight data. Aerodynamic parameters from single input excitation as well as multimanoeuver evaluation are estimated utilising output-error approach. The formulated mathematical 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 predict longitudinal dynamics to a given arbitrary input. It is further demonstrated for the present study that lateral body dynamics can be adequately predicted by including cross-coupling terms in the estimation model."