RESULTS OF LATERAL-DIRECTIONAL HELICOPTER SYSTEM IDENTIFICATION USING OUTPUT-ERROR AND BOTH GENETIC AND LEVENBERG-MARQUARDT OPTIMIZATION ALGORITHMS

This article presents the results concerning the estimation of the uncoupled linear lateral-directional forward flight derivatives of the "Twin Squirrel" AS355-F2 helicopter. The identification problem is solved in the time domain using the output error approach, in conjunction with both genetic and Levenberg-Marquardt optimization algorithms. A flight test compaing was performed and experimental data was obtained for this analysis. The helicopter linear equations of lateral-directional motion are used in order to identify the dimensional derivatives in level flight at 5,000 ft and 80 kt. The maneuvers were specified in accordance with conventional flight test procedures, taking in account the limitations of the mathematical model and flight safety constraints.

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