Parametric studies of wing extensions and winglets on whirl flutter stability

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Scopus citations

Abstract

This study focuses on the influences of wing and wing tip devices (wing extension and winglets) on tiltrotor whirl flutter speed. An aeroelastic winglet model has been implemented and parametric studies of winglet geometric angles such as cant, sweep and toe have been conducted. The influences of composite tailoring of wing including wing extensions and winglets have been investigated. Approaches to enhance the wing chord mode damping have been explored. The results show that wing tip devices have significant influences on wing beam bending and torsion mode damping; however, their effect on wing chord mode is negligible. The most effective approach to increase the wing chord mode damping is through the wing, and wing extension, beam bending-chord bending coupling by twisting beam spars. With wing extensions and winglets, main wing composite tailoring with bending-twist coupling can significantly boost the wing beam mode damping. Several wing system design studies have been carried out to investigate their potential to improve the wing mode stability. These design studies are based on the structurally tailoring of main wing and wing extension, tuning wing extension flexural beam stiffness, and configuring winglet geometric angles. Significant improvement is observed, and the increases of tiltrotor whirl flutter speed are between 75 and 150 knots compared to a baseline system.

Original languageEnglish (US)
Title of host publicationAmerican Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014
Subtitle of host publicationCurrent Challenges and Future Directions in Rotorcraft Aeromechanics
PublisherAmerican Helicopter Society International
Pages420-433
Number of pages14
ISBN (Electronic)9781634391788
StatePublished - Jan 1 2014
Event5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics - San Francisco, United States
Duration: Jan 22 2014Jan 24 2014

Publication series

NameAmerican Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics

Other

Other5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics
CountryUnited States
CitySan Francisco
Period1/22/141/24/14

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

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