# lab - 13.42 Design Principles for Ocean Vehicles Prof A.H...

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13.42 Design Principles for Ocean Vehicles Prof. A.H. Techet Spring 2005 Laboratory #1: Wave Spectra and ship response in waves Date issued: 31 March 2005 Date Due: 14 April 2005 1.1 INTRODUCTION Objectives : The object of this lab is to measure the response of a model ship due to incident waves. Students will analyze the response in heave and pitch motions of a 100:1 scale USS Arleigh Burke class DDG (destroyer, guided missile) model in both monochromatic and multi-frequency wave trains. Lab setup : This lab is performed in the Ocean Engineering towing tank. The DDG-51 model is mounted to a free moving linear carriage, and rests in the water at its design draft. In the first part of the lab waves are generated by wave paddle at one end of the tank and the model is fixed. In the second part of the lab, the model is towed at a forward speed in head seas such that the effects of encounter frequency can be observed.

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Ship Model: The model is a 100:1 scale USS Arleigh Burke class DDG (destroyer, guided missile). The primary characteristics of the DDG 51 follow. The model tested will be without a sonar dome. L PP 466.0 ft Length T 20.69 ft Draft B 58.98 ft Beam C P 0.625 C X 0.830 C b 0.519 C wp 0.789 8240 LT sw Displacement S ws 29,754 ft 2 Wetted surface area 1.2 EXPERIMENTAL PROCEDURE 1- Calibrate the wave probes. With the water in a calm state, record data at this zero point, then place a block of known height under the probes and record the data. By subtracting the voltage each team can then calibrate the volts to height for each of the probes. 2-
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## This note was uploaded on 02/27/2012 for the course MECHANICAL 2.22 taught by Professor Alexandratechet during the Spring '05 term at MIT.

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lab - 13.42 Design Principles for Ocean Vehicles Prof A.H...

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