Identification of aeroelastic parameters for helicopter tail rotor limit cycle oscillation monitoring

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Proceedings titleInternational Conference on Adaptive Structures and Technologies
ConferenceICAST2014 : 25nd International Conference on Adaptive Structures and Technologies, October 6-8th, 2014, The Hague, The Netherlands
Pages118; # of pages: 18
SubjectAeroelasticity; Aeroservoelasticity; Fighter aircraft; Helicopter rotors; Helicopters; Identification (control systems); Stochastic systems; Vibration analysis; Center frequency; In-situ measurement; Limit Cycle Oscillation
AbstractThe aeroelastic parameters of helicopter tail rotors are required in the monitoring and evaluation of rotor aeroservoelastic instability incidents such as limit cycle oscillations (LCO). However, in-situ measurement of these parameters on helicopters is generally difficult due to the need to transfer vibration data across a rotating interface. This paper presents a novel center frequency scaling factor relationship of the aeroelastic parameters between the rotating and stationary frames. Together with the stochastic parameter identification technique, this methodology enables real-time estimation and tracking of the critical aeroelastic parameters in the rotating frame during LCO events based on vibration information measured exclusively in the stationary frame. The methodology has been validated using flight vibration data measured from both the rotating and stationary frames of a helicopter tail rotor system during an LCO event. Moreover, this methodology has been applied to the analysis of vibration data measured from the teeter tail rotor system on the Canadian CH-149 Cormorant helicopters to derive the critical aeroelastic parameters during several LCO events.
Publication date
AffiliationAerospace; National Research Council Canada
Peer reviewedYes
NPARC number21275938
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Record identifier9c5804de-d532-4670-8491-4ab06432314a
Record created2015-08-11
Record modified2016-05-09
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