Helicopter rotor blade modal tuning using internal preloads

R. P. Dibble, B. Titurus

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

11 Scopus citations

Abstract

There are many benefits of variable speed rotors if the associated dynamics problems can be alleviated. Existing passive and active methods are unsuitable due to their mass/power requirements and effectiveness over the necessary frequency range. The concept of inducing controlled 'stress softening' to alter the natural frequencies of a rotating structure in a vacuum and in turn avoid resonance is explored in this research. This paper presents an experimental and computational demonstration of this concept in the context of a small scale rotor blade representation. The model is successfully validated away from and within regions of coupling in which veering was present, and was therefore used to assess the effectiveness of the concept on full sized rotorcraft blades. Full scale assessment demonstrated that adequate separation can be achieved without requiring excessively large forces. The aim of the research is to create a semi-active method for the alteration of the blade's resonant frequencies to avoid resonance within a range of rotor speeds.

Original languageEnglish (US)
Title of host publicationProceedings of ISMA 2016 - International Conference on Noise and Vibration Engineering and USD2016 - International Conference on Uncertainty in Structural Dynamics
PublisherKU Leuven, Departement Werktuigkunde
Pages851-864
Number of pages14
ISBN (Electronic)9789073802940
StatePublished - Jan 1 2016
Event27th International Conference on Noise and Vibration Engineering, ISMA 2016 and International Conference on Uncertainty in Structural Dynamics, USD2016 - Leuven, Belgium
Duration: Sep 19 2016Sep 21 2016

Conference

Conference27th International Conference on Noise and Vibration Engineering, ISMA 2016 and International Conference on Uncertainty in Structural Dynamics, USD2016
CountryBelgium
CityLeuven
Period09/19/1609/21/16

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Acoustics and Ultrasonics

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