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Abstract
Normalized design load spectra permit a recently proposed framework for fair, early, and meaningful assessments ofrotorcraft dynamic-component fatigue durability. In prior work, a mission-rainflow method defines fatigue loadspectra from historical flight test data. This paper proposes maximum-oscillatory and regime-rainflow alternativeswith a goal of decreasing the effort required to generate each load spectrum. A maneuver-to-maneuver techniqueensures representation of ground-air-ground cycles in the maximum-oscillatory and regime-rainflow alternatives.Discussion includes comparison to prior methods and an explanation of challenges and benefits associated with eachmethod. To enable comparison to prior methods, tables provide the newly derived mission spectrum loadoccurrences for main rotor pitch link load and tail rotor flap-wise bending, as well as characterizing parametersusing piecewise exponential distributions. Figures demonstrate the similarity of piecewise exponential distributionresults between regime-rainflow and mission-rainflow methods, while also suggesting conservatism for themaximum-oscillatory method. Fatigue analysis supports similar conclusions.

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  A Modified Method of Deriving Fatigue Load Spectra from Historical Flight Test Data

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