Torsion of Structural Shapes

Darwish, Iman; Johnston, Bruce G.

doi:10.1061/jsdeag.0001206

Cited by 11 publications

(1 citation statement)

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“…Neglecting the effect of restrained warping at the end of the torsional link, the torsion factor can be easily calculated [18] from De Saint Venant's torsion theory for free warping…”

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confidence: 99%

Structural modelling of a compliant flexure flow energy harvester

Chatterjee¹,

Bryant²

2015

Smart Mater. Struct.

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CHATTERJEE, PUNNAG. Structural Modeling of a Compliant Flexure Flow Energy Harvester. (Under the supervision of Dr. Matthew Bryant). This thesis presents the concept of a flow-induced vibration energy harvester based on a one-piece compliant flexure structure. This energy harvester utilizes the aeroelastic flutter phenomenon to convert flow energy to structural vibrational energy and to electrical power output through piezoelectric transducers. This flexure creates a discontinuity in the structural stiffness and geometry that can be used to tailor the mode shapes and natural frequencies of the device to the desired operating flow regime while eliminating the need for discrete hinges that are subject to fouling and friction. An approximate representation of the flexure rigidity is developed from the flexure link geometry, and a model of the complete discontinuous structure and integrated flexure is formulated based on transfer matrix method. The natural frequencies and mode shapes predicted by the model are validated using finite element simulations and are shown to be in close agreement. A proof-of-concept energy harvester incorporating the proposed flexure design has been fabricated and investigated in wind tunnel testing. The aeroelastic modal convergence, critical flutter wind speed, power output and limit cycle behavior of this device is experimentally determined and discussed.

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“…Neglecting the effect of restrained warping at the end of the torsional link, the torsion factor can be easily calculated [18] from De Saint Venant's torsion theory for free warping…”

Section: ( ) ( ) ( )mentioning

confidence: 99%