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UBC Theses and Dissertations
A stability monitoring and advisory system for small ships Köse, Ercan
Abstract
Considering the loss of lives and money as a result of marine accidents, the importance of reducing or preventing capsizing of small boats is clearly evident. The research described in this thesis addresses the development of a monitoring and advisory system for the safety of fishing vessels. This system uses environmental information obtained from a number of sensors and proposes corrective action based on a rule-base derived from experiments, theoretical research and human expertise. Improvements in computer technology and the low prices of measurement equipment facilitates the integration of a system based on off-the-shelf devices and subsystems such as a ship's radar system to measure wave properties. The thesis demonstrates that such off-the-shelf devices and subsystems can be used with special purpose software developed to produce a low cost, intelligent safety monitoring and advisory system. This monitoring system is designed based on the following requirements : • The system should measure the minimum amount of data. In order to make system practical and least costly, the equipments already existing onboard should be used. • The system should not interfere with the operation of the ship, since anything interfering with operation is expected to be discarded by the captain or crew. In view of the need for the evaluation of wave parameters at a fast rate, in the order of 30 - 60 seconds, for input into the advisory system, two new techniques (Boxing and thinning techniques) have been developed. Reasonable agreement has been found between these two techniques and conventional techniques, such as Fourier transforms. A fuzzy expert system has been developed as a decision making process for the monitoring and advisory system. Rules forming the basis for the advisory system are presented. An advantage of this modular structure is that new rules may be easily appended to the existing rule-base in view of further knowledge gained through interviewing experts, experiments or theoretical developments. Finally, feasibility of this approach has been demonstrated through numerical simulations of various sea conditions on a range of ship forms.
Item Metadata
Title |
A stability monitoring and advisory system for small ships
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1994
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Description |
Considering the loss of lives and money as a result of marine accidents, the importance
of reducing or preventing capsizing of small boats is clearly evident.
The research described in this thesis addresses the development of a monitoring and
advisory system for the safety of fishing vessels. This system uses environmental information
obtained from a number of sensors and proposes corrective action based on a
rule-base derived from experiments, theoretical research and human expertise.
Improvements in computer technology and the low prices of measurement equipment
facilitates the integration of a system based on off-the-shelf devices and subsystems such
as a ship's radar system to measure wave properties. The thesis demonstrates that such
off-the-shelf devices and subsystems can be used with special purpose software developed
to produce a low cost, intelligent safety monitoring and advisory system.
This monitoring system is designed based on the following requirements :
• The system should measure the minimum amount of data. In order to make system
practical and least costly, the equipments already existing onboard should be used.
• The system should not interfere with the operation of the ship, since anything
interfering with operation is expected to be discarded by the captain or crew.
In view of the need for the evaluation of wave parameters at a fast rate, in the order
of 30 - 60 seconds, for input into the advisory system, two new techniques (Boxing and
thinning techniques) have been developed. Reasonable agreement has been found between
these two techniques and conventional techniques, such as Fourier transforms.
A fuzzy expert system has been developed as a decision making process for the monitoring
and advisory system. Rules forming the basis for the advisory system are presented.
An advantage of this modular structure is that new rules may be easily appended
to the existing rule-base in view of further knowledge gained through interviewing experts,
experiments or theoretical developments.
Finally, feasibility of this approach has been demonstrated through numerical simulations
of various sea conditions on a range of ship forms.
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Extent |
5488771 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-04-16
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0088049
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1995-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.