Upgrades to and Current Research Efforts Involving the Tow Tank Facility at the Naval Postgraduate School
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Authors
Klamo, Joseph T.
Jones, Leo M.
Kwon, Young W.
Didoszak, Jarema M.
Subjects
Advisors
Date of Issue
2017
Date
2017
Publisher
ATTC
Language
Abstract
The Naval Postgraduate School has added wave making capability to the existing small tow tank that resides on campus. A new collaborative research effort between the Systems Engineering and Mechanical and Aerospace Engineering Departments is underway that utilizes this new capability. The aim of this new effort is to understand and predict the unsteady hydrodynamic loads experienced by a submerged vehicle operating near the surface. The tow tank was originally built around 1970 but only had the capability of testing models at slow speed in calm water. Even with this limited capability, a number of interesting studies were conducted in the facility including measuring the drag on a towed hydropower turbine and examining the forces due to collisions between floating iceequivalent objects and a composite plate. The new wave making capability in the tow tank is provided by a vertical plunging wedge that was modeled off of the sediment tank wavemaker at the United States Naval Academy. The wedge rides on a pair of vertical rails with the oscillation amplitude and frequency controlled by a linear actuator and electric motor. A variable angle wave absorbing beach is planned for the opposite end of the tank. An additional component of this modernization effort is the creation of a numeric tow tank, using ANSYS CFX, which can simulate the wave dynamics in the tank. This allows complementary numerical and experimental components of future research efforts. The current experimental effort involves characterizing the performance of the wavemaker and quantifying the wave environment throughout the tank. The wedge to wave amplitude transfer function has been determined over the relevant amplitude and frequency space. The uniformity of a wave crest has also been examined. For the numeric tow tank work, the wedge motion has been duplicated and the simulated wave elevation and propagation down the tank are being compared to experimentally measured results.2017
Type
Conference Paper
Description
The 30th American Towing Tank Conference, West Bethesda, Maryland, October 2017
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Undersea Warfare
Organization
Identifiers
NPS Report Number
Sponsors
The Research and Sponsored Programs Office at the Naval Postgraduate School provided funding for this effort as part of the institutionally funded Research Initiation Pro- gram for new faculty members (J.T. Klamo). The Consor- tium for Robotics and Unmanned Systems Education and Research (CRUSER) also provided funding for the current research (J.T. Klamo and Y.W. Kwon).
Funder
The Research and Sponsored Programs Office at the Naval Postgraduate School provided funding for this effort as part of the institutionally funded Research Initiation Pro- gram for new faculty members (J.T. Klamo). The Consor- tium for Robotics and Unmanned Systems Education and Research (CRUSER) also provided funding for the current research (J.T. Klamo and Y.W. Kwon).
Format
10 p.
Citation
Klamo, J. T., et al. "Upgrades to and current research efforts involving the tow tank facility at the Naval Postgraduate School." Proceedings of the 30th American Towing Tank Conference. 2017.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.