Investigation of a linear, two-degree-of-freedom simulation for the XR-3 Captured Air Bubble (CAB) craft in the frequency domain.
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Authors
McIntyre, Lewis Frank
Subjects
XR-3
linear model
frequency response
linear model
frequency response
Advisors
Gerba, Alex Jr.
Date of Issue
1977-06
Date
June 1977
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
A simplified two-degree-of-freedom simulation in
heave and pitch of the XR-3 Captured Air Bubble (CAB)
testcraft is developed first in a non- linear form and
is subsequently linearized about the steady-state
operating point. The model is validated against the
six-degree-of-freedom XR-3 Loads and Motions program
in the time domain; the linear system is then
transformed into the frequency domain by complex
matrix inversion. A comparison is made between the
linear system frequency response predicted by the
two-degree-of- freedom model and that of the Loads and
Motions program, as well as actual testcraft data,
reduced to the frequency domain by a Fast Fourier
Transform (FFT) technique. This comparison of
frequency response curves highlights a non-linear mode
of CAB craft behavior of possible interest to
habitability and seaworthiness studies.
Type
Thesis
Description
Series/Report No
Department
Aeronautics
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
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.