The angle dependence of the roll damping moment
Thesis (M.Eng.)--Memorial University of Newfoundland, 1990. Engineering and Applied Science Bibliography: leaves 104-106. A new approach to the analysis of the free roll decay curve, the Energy method, is examined in this paper and compared with two commonly accepted methods of analysis, the averagi...
Main Author: | |
---|---|
Other Authors: | |
Format: | Thesis |
Language: | English |
Published: |
1990
|
Subjects: | |
Online Access: | http://collections.mun.ca/cdm/ref/collection/theses2/id/236832 |
id |
ftmemorialunivdc:oai:collections.mun.ca:theses2/236832 |
---|---|
record_format |
openpolar |
spelling |
ftmemorialunivdc:oai:collections.mun.ca:theses2/236832 2023-05-15T17:23:31+02:00 The angle dependence of the roll damping moment Bennett, Peter Memorial University of Newfoundland. Faculty of Engineering and Applied Science 1990 viii, 106 leaves : ill. Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses2/id/236832 Eng eng Electronic Theses and Dissertations (10.73 MB) -- http://collections.mun.ca/PDFs/theses/Bennett_Peter.pdf 76072887 http://collections.mun.ca/cdm/ref/collection/theses2/id/236832 The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries Damping (Mechanics) Stability of ships Text Electronic thesis or dissertation 1990 ftmemorialunivdc 2015-08-06T19:17:26Z Thesis (M.Eng.)--Memorial University of Newfoundland, 1990. Engineering and Applied Science Bibliography: leaves 104-106. A new approach to the analysis of the free roll decay curve, the Energy method, is examined in this paper and compared with two commonly accepted methods of analysis, the averaging technique of Krylov-Bogoliubov and the Perturbation method. The Energy method uses the equality of the rate of change of the total energy of the system to the rate of energy dissipation due to damping. This method was concluded to be the best method for analysis for three main reasons. 1) It uses the whole roll decay record in its analysis, not just the peak values, allowing for single cycle analysis and analysis of shorter roll decay records. 2) It can separate the influence of the angle and velocity dependent components of the roll damping moment. 3) It can handle non-linear restoring terms which makes it viable for large amplitude motion. -- The Energy method and the Krylov-Bogoliubov method were used to analyze stillwater roll decay test records. The results of these analyses indicate a strong angle dependence of the roll damping moment. The quadratic and cubic velocity dependent forms, which are actually functions of the roll angle, of the roll damping moment were shown to be the most viable forms for the roll damping moment. This supports the findings of a strong angle dependence. Stillwater roll decay tests with forward speed were performed and also indicate a strong angle dependence of the roll damping moment. Comparisons of forced roll tests with predictions of forced roll motion using coefficients derived from the stillwater roll decay analyses proved inconclusive. Thesis Newfoundland studies University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
institution |
Open Polar |
collection |
Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
op_collection_id |
ftmemorialunivdc |
language |
English |
topic |
Damping (Mechanics) Stability of ships |
spellingShingle |
Damping (Mechanics) Stability of ships Bennett, Peter The angle dependence of the roll damping moment |
topic_facet |
Damping (Mechanics) Stability of ships |
description |
Thesis (M.Eng.)--Memorial University of Newfoundland, 1990. Engineering and Applied Science Bibliography: leaves 104-106. A new approach to the analysis of the free roll decay curve, the Energy method, is examined in this paper and compared with two commonly accepted methods of analysis, the averaging technique of Krylov-Bogoliubov and the Perturbation method. The Energy method uses the equality of the rate of change of the total energy of the system to the rate of energy dissipation due to damping. This method was concluded to be the best method for analysis for three main reasons. 1) It uses the whole roll decay record in its analysis, not just the peak values, allowing for single cycle analysis and analysis of shorter roll decay records. 2) It can separate the influence of the angle and velocity dependent components of the roll damping moment. 3) It can handle non-linear restoring terms which makes it viable for large amplitude motion. -- The Energy method and the Krylov-Bogoliubov method were used to analyze stillwater roll decay test records. The results of these analyses indicate a strong angle dependence of the roll damping moment. The quadratic and cubic velocity dependent forms, which are actually functions of the roll angle, of the roll damping moment were shown to be the most viable forms for the roll damping moment. This supports the findings of a strong angle dependence. Stillwater roll decay tests with forward speed were performed and also indicate a strong angle dependence of the roll damping moment. Comparisons of forced roll tests with predictions of forced roll motion using coefficients derived from the stillwater roll decay analyses proved inconclusive. |
author2 |
Memorial University of Newfoundland. Faculty of Engineering and Applied Science |
format |
Thesis |
author |
Bennett, Peter |
author_facet |
Bennett, Peter |
author_sort |
Bennett, Peter |
title |
The angle dependence of the roll damping moment |
title_short |
The angle dependence of the roll damping moment |
title_full |
The angle dependence of the roll damping moment |
title_fullStr |
The angle dependence of the roll damping moment |
title_full_unstemmed |
The angle dependence of the roll damping moment |
title_sort |
angle dependence of the roll damping moment |
publishDate |
1990 |
url |
http://collections.mun.ca/cdm/ref/collection/theses2/id/236832 |
genre |
Newfoundland studies University of Newfoundland |
genre_facet |
Newfoundland studies University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
Electronic Theses and Dissertations (10.73 MB) -- http://collections.mun.ca/PDFs/theses/Bennett_Peter.pdf 76072887 http://collections.mun.ca/cdm/ref/collection/theses2/id/236832 |
op_rights |
The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. |
_version_ |
1766112995972218880 |