Show simple item record

dc.creatorGarner, Luke Jayen_US
dc.date.accessioned2012-06-07T22:55:42Z
dc.date.available2012-06-07T22:55:42Z
dc.date.created1999en_US
dc.date.issued1999
dc.identifier.urihttp://hdl.handle.net/1969.1/ETD-TAMU-1999-THESIS-G38en_US
dc.descriptionDue to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to digital@library.tamu.edu, referencing the URI of the item.en_US
dc.descriptionIncludes bibliographical references (leaves 72-76).en_US
dc.descriptionIssued also on microfiche from Lange Micrographics.en_US
dc.description.abstractThe development of a biomimetic active hydrofoil that utilizes Shape Memory Alloy (SMA) actuator technology is presented herein. This work is the first stage prototype of a vehicle that will consist of many actuated body segments. The current work describes the design, modeling, and testing of a single segment demonstration SMA actuated hydrofoil. The SMA actuation elements are two sets of thin wires on either side of an elastomeric component that joins together the leading and trailing edges of the hydrofoil. Controlled heating and cooling of the two wire sets generates bi-directional bending of the elastomer, which in turn deflects the trailing edge of the hydrofoil. In this paper the design of the hydrofoil and the experimental tests performed thereon are explained. A detailed account of SMA actuator preparation (training) and material characterization is given. The constitutive model used for the SMA actuators is summarized and a parametric study of the material parameters used in this model is presented. Finite element method (FEM) modeling of hydrofoil response to electrical heating of the SMA actuators is carried out using a photomechanical constitutive model for SMA with input from the material characterization. The modeling predictions are finally compared with experimental measurements of the trailing edge deflection and the SMA actuator temperature. A scheme whereby the coupling of the hydrodynamic load and the hydrofoil shape is discussed. A verification of the scheme is given, as well as, a study of its convergence characteristics. The scheme is then used in FEM calculations to determine the effect of the hydrodynamic loads on the hydrofoil during an actuation cycle.en_US
dc.format.mediumelectronicen_US
dc.format.mimetypeapplication/pdfen_US
dc.language.isoen_USen_US
dc.publisherTexas A&M Universityen_US
dc.rightsThis thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries in 2008. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.en_US
dc.subjectaerospace engineering.en_US
dc.subjectMajor aerospace engineering.en_US
dc.titleCharacterization and modeling of a shape memory allow actuated biomimetic vehicleen_US
dc.typeThesisen_US
thesis.degree.disciplineaerospace engineeringen_US
thesis.degree.nameM.S.en_US
thesis.degree.levelMastersen_US
dc.type.genrethesis
dc.type.materialtexten_US
dc.format.digitalOriginreformatted digitalen_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record

This item and its contents are restricted. If this is your thesis or dissertation, you can make it open-access. This will allow all visitors to view the contents of the thesis.

Request Open Access