Application of a refined time domain elastomeric damper model to helicopter rotor aeroelastic response and stability

Christian R. Brackbill, Edward C. Smith, George A. Lesieutre

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

A new nonlinear time domain elastomeric damper model is developed for use with helicopter rotor analyses. In hover, the new model exhibits significant low amplitude nonlinearity that is similar to behavior observed in elastomer material coupon bench tests. As the damper amplitude decreases, the lag frequency increases by 60% while the damping decreases by 85%. In forward flight, the model predicts a decrease in damping of approximately 50% due to "dual-frequency" motion. Previous experiments indicate that these predicted trends are accurate and necessary for elastomeric damper modeling. The new damper model also accurately predicts time domain damper loads. As such, it represents an improvement over both traditional complex modulus models and first generation time domain models. Finally, owing to its compact form, accuracy, and straightforward solution procedure, the coupled rotor-damper model is shown to be a useful tool for preliminary rotor-damper design.

Original languageEnglish (US)
Pages (from-to)186-197
Number of pages12
JournalJournal of the American Helicopter Society
Volume47
Issue number3
DOIs
StatePublished - Jul 2002

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Application of a refined time domain elastomeric damper model to helicopter rotor aeroelastic response and stability'. Together they form a unique fingerprint.

  • Cite this