Bell Model 505 Fatigue Test Loads Derivation using Flight Test Data Reduction and Convex Envelopes
Maxime Lapalme, Guillaume Biron, Marc Ouellet, Bell Helicopter Textron Canada Limited
May 17, 2016
Bell Model 505 Fatigue Test Loads Derivation using Flight Test Data Reduction and Convex Envelopes
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Bell Model 505 Fatigue Test Loads Derivation using Flight Test Data Reduction and Convex Envelopes
Authors / Details: Maxime Lapalme, Guillaume Biron and Marc Ouellet, Bell Helicopter Textron Canada LimitedAbstract
In this paper, a methodology to derive loads to apply to a full scale fatigue test from flight test data is presented. Bell model 505 tailboom is used to illustrate the methodology. First, the tailboom instrumentation for flight testing is described. A complete Load Level Survey is performed to gather the data required for the fatigue test. Then, the whole flight test data (18,000,000 data points) is reduced to a critical convex envelope (roughly 5,000 data points). To further reduce the loads data set to a manageable number for a fatigue test, a Finite Element model is built to obtain relations between applied loads and stresses at specific locations on the tailboom. A total number of 6 load cases are finally identified and a proper loading sequence is defined according to various considerations. Finally, the whole methodology and limitations are discussed.
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Bell Model 505 Fatigue Test Loads Derivation using Flight Test Data Reduction and Convex Envelopes
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