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

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1177/1045389X15606996
AuthorSearch for: 1; Search for: 1; Search for: 1
Name affiliation
  1. National Research Council of Canada. Aerospace
FormatText, Article
Journal titleJournal of Intelligent Material Systems and Structures
ISSN1045-389X
1530-8138
Subjectstructural health monitoring; sensor; embedded intelligence
Abstract
The 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
LanguageEnglish
Peer reviewedYes
NPARC number21276895
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Record identifier4a7f2a3c-8d91-4b91-8246-ee568f72835e
Record created2015-11-04
Record modified2020-04-22
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