Accession Number : ADA133090

Title :   Preliminary Kinematic Consistency Checking of Helicopter Flight Data.

Descriptive Note : Aerodynamics note,


Personal Author(s) : Gilbert,N E ; Williams,M J

PDF Url : ADA133090

Report Date : Jan 1983

Pagination or Media Count : 36

Abstract : A simplified approach to kinematic consistency checking applied to ARL Sea King helicopter flight trials data is given. Prompt implementation of the method has been possible, pending longer term development of system identification techniques suitable for application in a general way to helicopter data. This has allowed the formation of a trials data bank with resonable confidence in the kinematic quantities so that validation of the ARL Sea King mathematical model can continue. In the process adopted, measurements are first digitally filtered to remove noise. Alternative values of kinematic quantities are then derived from the smoothed measurements, using numerical differentiation or integration. For quantities obtained by integration, two separate iteration cycles are used, thus enabling kinematic equations to be integrated independently by 'separation of variables' using the trapezoidal formula. Uncertainties in some calibration constants are resolved using differences between measured and derived kinematic quantities. A procedure for the replacement of suspect angular measurements by derived values in the calculation of other dependent quantities is described and demonstrated.

Descriptors :   *Kinematics, Flight testing, Helicopters, Data processing, Data reduction, Validation, Accuracy, Mathematical models, Data bases, Foreign technology

Subject Categories : Helicopters

Distribution Statement : APPROVED FOR PUBLIC RELEASE