Bistable mechanisms for morphing rotors

Terrence Johnson, Farhan Gandhi, Mary Frecker

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

2 Citations (Scopus)

Abstract

In this paper we explore the use of bistable mechanisms for rotor morphing, specifically, blade tip twist. The optimal blade twist distributions for hover and high-speed forward flight are very different, and the ability of the rotor to change effective twist is expected to be advantageous. Bistable or "snap-through" mechanisms have multiple stable equilibrium states and are a novel way to achieve large actuation output stroke at relatively modest effort for gross rotor morphing applications. This is because in addition to the large actuation stroke associated with the snap-through (relative to conventional actuator/ amplification systems) coming at relatively low actuation effort, no locking is required in either equilibrium state (since they are both stable). In this work, the performance of a bistable twisting device is evaluated under an aerodynamic lift load. The device is analyzed using finite element analysis to predict the device's load carrying capability and bistable behavior.

Original languageEnglish (US)
Title of host publicationActive and Passive Smart Structures and Integrated Systems 2008
DOIs
StatePublished - Jun 2 2008
EventActive and Passive Smart Structures and Integrated Systems 2008 - San Diego, CA, United States
Duration: Mar 10 2008Mar 13 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6928
ISSN (Print)0277-786X

Other

OtherActive and Passive Smart Structures and Integrated Systems 2008
CountryUnited States
CitySan Diego, CA
Period3/10/083/13/08

Fingerprint

Morphing
actuation
Rotor
rotors
Rotors
Twist
strokes
Stroke
Blade
Equilibrium State
blade tips
twisting
blades
Turbomachine blades
locking
Amplification
Aerodynamics
Locking
Actuators
actuators

All Science Journal Classification (ASJC) codes

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

Cite this

Johnson, T., Gandhi, F., & Frecker, M. (2008). Bistable mechanisms for morphing rotors. In Active and Passive Smart Structures and Integrated Systems 2008 [692829] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 6928). https://doi.org/10.1117/12.775748
Johnson, Terrence ; Gandhi, Farhan ; Frecker, Mary. / Bistable mechanisms for morphing rotors. Active and Passive Smart Structures and Integrated Systems 2008. 2008. (Proceedings of SPIE - The International Society for Optical Engineering).
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Johnson, T, Gandhi, F & Frecker, M 2008, Bistable mechanisms for morphing rotors. in Active and Passive Smart Structures and Integrated Systems 2008., 692829, Proceedings of SPIE - The International Society for Optical Engineering, vol. 6928, Active and Passive Smart Structures and Integrated Systems 2008, San Diego, CA, United States, 3/10/08. https://doi.org/10.1117/12.775748

Bistable mechanisms for morphing rotors. / Johnson, Terrence; Gandhi, Farhan; Frecker, Mary.

Active and Passive Smart Structures and Integrated Systems 2008. 2008. 692829 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 6928).

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

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Johnson T, Gandhi F, Frecker M. Bistable mechanisms for morphing rotors. In Active and Passive Smart Structures and Integrated Systems 2008. 2008. 692829. (Proceedings of SPIE - The International Society for Optical Engineering). https://doi.org/10.1117/12.775748