2026-09-19T09:09:21Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/505532022-01-13T07:54:39Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
Jamie Anderson.
Marquardt, J. Paul (Joseph Paul), 1975-
Massachusetts Institute of Technology. Dept. of Ocean Engineering.
Massachusetts Institute of Technology. Department of Ocean Engineering
2010-01-07T20:52:16Z
2010-01-07T20:52:16Z
1998
1998
http://hdl.handle.net/1721.1/50553
45260492
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1998.
Includes bibliographical references (p. 88-89).
The hover actuator system is a proof of concept platform. The design models the ability of a flapping foil to assist an undersea vehicle's shallow water sea-keeping performance. Goals of this study are to demonstrate an effective regime of foil motion amplitude, frequency, pitch angle offset, pitch angle amplitude and phase angle for two types of motion. Using the time-averaged thrust coefficient, I find that the lower frequencies provide the highest thrust coefficient of 3.1 at G0=600, hdc= 1.5, and f=0.4Hz for the treading water mode. Significantly lower thrust coefficients are observed for the figure eight mode with maximum of 1.8 occurring at G0=300, hdc=1, and f-0.2Hz. In addition to finding the optimal regime of thrust coefficient, the total thrust is also analyzed to find the regimes of absolute maximum thrust. Again, for the water treading mode the peak thrust was 24Newtons at 00=600, hjc=2.5, and f=0.6Hz; and for the figure eight mode the peak thrust of 7.5Newtons occurs at 00=450, hdc=2.7, and f-0.2Hz. Finally, the rationale of using such an apparatus, arguments, and test results are discussed in conclusion.
by J. Paul Marquardt.
S.M.
89 p.
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by
copyright. They may be viewed from this source for any purpose, but
reproduction or distribution in any format is prohibited without written
permission. See provided URL for inquiries about permission.
http://dspace.mit.edu/handle/1721.1/7582
Ocean Engineering.
The use of foil generated vorticity as a hover actuator system for undersea vehicles
Thesis
application/pdf
Publication
unknown
unknown
<Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="759d0662-f68f-4fde-91da-b876438e515f">
<Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type>
<Language>eng</Language>
<Title>The use of foil generated vorticity as a hover actuator system for undersea vehicles</Title>
<PublishedIn>
<Publication>
</Publication>
</PublishedIn>
<PublicationDate>1998</PublicationDate>
<Authors>
<Author>
<DisplayName>Marquardt, J. Paul (Joseph Paul), 1975-</DisplayName>
<Affiliation>
<OrgUnit>
</OrgUnit>
</Affiliation>
</Author>
</Authors>
<Editors>
</Editors>
<Publishers>
<Publisher>
<DisplayName>Massachusetts Institute of Technology</DisplayName>
<OrgUnit />
</Publisher>
</Publishers>
<License>http://dspace.mit.edu/handle/1721.1/7582</License>
<Keyword>Ocean Engineering.</Keyword>
<Abstract>The hover actuator system is a proof of concept platform. The design models the ability of a flapping foil to assist an undersea vehicle's shallow water sea-keeping performance. Goals of this study are to demonstrate an effective regime of foil motion amplitude, frequency, pitch angle offset, pitch angle amplitude and phase angle for two types of motion. Using the time-averaged thrust coefficient, I find that the lower frequencies provide the highest thrust coefficient of 3.1 at G0=600, hdc= 1.5, and f=0.4Hz for the treading water mode. Significantly lower thrust coefficients are observed for the figure eight mode with maximum of 1.8 occurring at G0=300, hdc=1, and f-0.2Hz. In addition to finding the optimal regime of thrust coefficient, the total thrust is also analyzed to find the regimes of absolute maximum thrust. Again, for the water treading mode the peak thrust was 24Newtons at 00=600, hjc=2.5, and f=0.6Hz; and for the figure eight mode the peak thrust of 7.5Newtons occurs at 00=450, hdc=2.7, and f-0.2Hz. Finally, the rationale of using such an apparatus, arguments, and test results are discussed in conclusion.</Abstract>
<Access xmlns="http://purl.org/coar/access_right"
>
</Access>
</Publication>