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1 Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

1 1999

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Comparison of the ground and in-flight helicopter vibrations testing

Uhl T., Lisowski W., Wasilak A., Auweraer H., Hermans L.

Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

1999

nr 9

157-162

This paper presents an approach to aircraft airframe structural vibration testing in both the ground and the flight conditions. The main objective of the research was to investigate the applicability of the selected experimental method and the identification algorithm for the description of the operational conditions structural vibration. For comparison purpose a set of the reference modal models obtained for the ground conditions was The in-flight testing measurement of acceleration of the selected airframe points was for different flight conditions. Identification of the structural dynamics model was carried out with use of the Least Squares Complex Exponential applied for the correlation functions from the recorded tested object output In the paper an overview of the ground and the in-flight vibration testing of a helicopter airframe is given. Main results of the both experiments are and compared. It should be noted that not only the natural frequency values but also mode for flight conditions were identified. The obtained results indicated the difference between the identified modal model for the ground and the inflight conditions as well as the actual structural vibration contribution to the tested helicopter operational vibrations.