A bistable mechanism for chord extension morphing rotors

Terrence Johnson, Mary I. Frecker, Farhan Gandhi

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

4 Scopus citations

Abstract

Research efforts have shown that helicopter rotor blade morphing is an effective means to improve flight performance. Previous example of rotor blade morphing include using smart-materials for trailing deflection and rotor blade twist and tip twist, the development of a comfortable airfoil using compliant mechanisms, the use of a Gurney flap for air-flow deflection and centrifugal force actuated device to increase the span of the blade. In this paper we explore the use of a bistable mechanism for rotor morphing, specifically, blade chord extension using a bistable arc. Increasing the chord of the rotor blade is expected to generate more lift-load and improve helicopter performance. Bistable or "snap through" mechanisms have multiple stable equilibrium states and are a novel way to achieve large actuation output stroke. Bistable mechanisms do not require energy input to maintain a stable equilibrium state as both states do not require locking. In this work, we introduce a methodology for the design of bistable arcs for chord morphing using the finite element analysis and pseudo-rigid body model, to study the effect of different arc types, applied loads and rigidity on arc performance.

Original languageEnglish (US)
Title of host publicationActive and Passive Smart Structures and Integrated Systems 2009
DOIs
StatePublished - Sep 7 2009
EventActive and Passive Smart Structures and Integrated Systems 2009 - San Diego, CA, United States
Duration: Mar 9 2009Mar 12 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7288
ISSN (Print)0277-786X

Other

OtherActive and Passive Smart Structures and Integrated Systems 2009
CountryUnited States
CitySan Diego, CA
Period3/9/093/12/09

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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    Johnson, T., Frecker, M. I., & Gandhi, F. (2009). A bistable mechanism for chord extension morphing rotors. In Active and Passive Smart Structures and Integrated Systems 2009 [72881C] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7288). https://doi.org/10.1117/12.815472