Dual optimization of contact-aided compliant mechanisms for passive dynamic shape change

Joseph P. Calogero, Mary I. Frecker, Zohaib Hasnain, James E. Hubbard

Research output: Contribution to journalArticle

Abstract

A dual optimization method for optimizing contact-aided compliant mechanism design parameters and their spatial distribution in a dynamic ornithopter wing structure for increased pitch agility is presented. This methodology separates the task into two separate optimization problems where, first, a computationally efficient rigid-body dynamics model is used to determine the optimal stiffness and spatial distribution of the compliant mechanisms and, second, a detailed compliant mechanism design is developed and optimized that achieves the desired nonlinear stiffness. A rigid-body mechanics model of the wing structure is used to find the location and stiffness of a contact-aided compliant mechanism that will induce the forward sweep passively by coupling lift loads to forward sweep. The forward-swept compliant mechanism is then developed and optimized to achieve the desirable coupling. The free-flight pitch agility of an ornithopter is shown to increase via sweeping the wings forward during downstroke. A free-flight experiment is performed, and the novel contact-aided compliant mechanism is shown to induce the desired forward sweep during downstroke.

Original languageEnglish (US)
Pages (from-to)3745-3756
Number of pages12
JournalAIAA journal
Volume56
Issue number9
DOIs
StatePublished - Jan 1 2018

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Compliant mechanisms
Free flight
Stiffness
Spatial distribution
Dynamic models
Mechanics

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

Cite this

Calogero, Joseph P. ; Frecker, Mary I. ; Hasnain, Zohaib ; Hubbard, James E. / Dual optimization of contact-aided compliant mechanisms for passive dynamic shape change. In: AIAA journal. 2018 ; Vol. 56, No. 9. pp. 3745-3756.
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Dual optimization of contact-aided compliant mechanisms for passive dynamic shape change. / Calogero, Joseph P.; Frecker, Mary I.; Hasnain, Zohaib; Hubbard, James E.

In: AIAA journal, Vol. 56, No. 9, 01.01.2018, p. 3745-3756.

Research output: Contribution to journalArticle

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