Identification of aeroelastic parameters for cormorant tail rotor structures based on vibration measurement in the stationary frame

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TypeArticle
Proceedings titleCollection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Conference53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, 23 April 2012 through 26 April 2012, Honolulu, HI
ISSN0273-4508
ISBN9781600869372
Article numberAIAA 2012-1479
SubjectAero-elastic simulations; Center frequency; Flight conditions; Helicopter fleets; High-amplitude vibrations; Identified parameter; Limit Cycle Oscillation (LCO); Stationary frame; Aeroelasticity; Structural dynamics; Helicopter rotors
AbstractThe teetering tail rotor of the Canadian CH-149 Cormorant helicopter fleet experienced limit cycle oscillation (LCO) phenomenon in certain adverse flight conditions in which the transient high amplitude vibration resulted in significant increase of dynamic strain to the tail rotor structures. This could contribute to pre-mature damage of the composite half hub among other causes. Therefore it is required to evaluate the integrity of the tail rotor structure using realistic aeroelastic parameters of the tail rotor in the rotating frame. This paper presents a novel center frequency scaling factor theory and related parameter identification methodologies in order to estimate and track the variation of the critical aeroelastic parameters in the rotating frame during LCO events based on vibration information measured exclusively in the stationary frame. This information would enable update of the tail rotor stability diagram in order to confidently evaluate the impact of LCO events to the structural integrity of the Cormorant tail rotor structures. Based on the developed procedures and identified parameters, recommendations are provided for data analysis and techniques to improve the fidelity of results from aeroelastic simulation analysis for the Cormorant tail rotor structures without the need to install sensors in the rotating frame. © 2012 AIAA.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21269153
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Record identifier79f59eab-defd-42c0-b44d-290688e7def5
Record created2013-12-12
Record modified2016-05-09
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