Design optimization of offshore construction vessels
The topic of this thesis is optimization of ship design with regards to operational performance. 4 VARD Offshore Subsea Construction Vessels are analysed to find the optimum compromise of operability versus required power, building costs and machinery costs. Operability is assessed with regards to s...
Main Author: | |
---|---|
Other Authors: | , |
Format: | Master Thesis |
Language: | English |
Published: |
NTNU
2016
|
Subjects: | |
Online Access: | http://hdl.handle.net/11250/2433681 |
id |
ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2433681 |
---|---|
record_format |
openpolar |
spelling |
ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2433681 2023-05-15T17:47:07+02:00 Design optimization of offshore construction vessels Sandvik, Endre Steen, Sverre Erikstad, Stein Ove 2016 http://hdl.handle.net/11250/2433681 eng eng NTNU ntnudaim:15933 http://hdl.handle.net/11250/2433681 Marin teknikk Marin hydrodynamikk Master thesis 2016 ftntnutrondheimi 2019-09-17T06:52:14Z The topic of this thesis is optimization of ship design with regards to operational performance. 4 VARD Offshore Subsea Construction Vessels are analysed to find the optimum compromise of operability versus required power, building costs and machinery costs. Operability is assessed with regards to subsea lifting operations using the ShipX plugin VERES. Criteria is established for lifting phases in air, splash-zone and lowering through the water column. Parametric variations of beam, draught, GM and radius of gyration for roll motion is done to find their effect on operability. Required power at transit speed for beam and draught variations is found using experimental results from MARINTEK and the empirical method Holtrop 84. Building and machinery costs are assessed using empirical methods. Statistics from the North Sea and Norwegian Sea is applied to determine operability. Results from these areas is found to differ significantly. The only parameter resulting in consistent change in operability is the vessel length. The remaining parameters vary in terms of their effect on operability depending on vessel and operational area. The length is found to have the largest impact on costs, and the beam is found to be a more cost effective parameter for increasing operability compared to draught. It is shown that variation of beam is more difficult compared to draught if a constant GM is required without large modifications of general arrangement. The applied methodology of assessing operability differs from the procedure of planning and executing lifting operations since weather windows and -factors are neglected. This lead to an overestimate of operability represented as the expected percentage of time the vessel is capable of performing operations. Master Thesis Norwegian Sea NTNU Open Archive (Norwegian University of Science and Technology) Norwegian Sea |
institution |
Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
topic |
Marin teknikk Marin hydrodynamikk |
spellingShingle |
Marin teknikk Marin hydrodynamikk Sandvik, Endre Design optimization of offshore construction vessels |
topic_facet |
Marin teknikk Marin hydrodynamikk |
description |
The topic of this thesis is optimization of ship design with regards to operational performance. 4 VARD Offshore Subsea Construction Vessels are analysed to find the optimum compromise of operability versus required power, building costs and machinery costs. Operability is assessed with regards to subsea lifting operations using the ShipX plugin VERES. Criteria is established for lifting phases in air, splash-zone and lowering through the water column. Parametric variations of beam, draught, GM and radius of gyration for roll motion is done to find their effect on operability. Required power at transit speed for beam and draught variations is found using experimental results from MARINTEK and the empirical method Holtrop 84. Building and machinery costs are assessed using empirical methods. Statistics from the North Sea and Norwegian Sea is applied to determine operability. Results from these areas is found to differ significantly. The only parameter resulting in consistent change in operability is the vessel length. The remaining parameters vary in terms of their effect on operability depending on vessel and operational area. The length is found to have the largest impact on costs, and the beam is found to be a more cost effective parameter for increasing operability compared to draught. It is shown that variation of beam is more difficult compared to draught if a constant GM is required without large modifications of general arrangement. The applied methodology of assessing operability differs from the procedure of planning and executing lifting operations since weather windows and -factors are neglected. This lead to an overestimate of operability represented as the expected percentage of time the vessel is capable of performing operations. |
author2 |
Steen, Sverre Erikstad, Stein Ove |
format |
Master Thesis |
author |
Sandvik, Endre |
author_facet |
Sandvik, Endre |
author_sort |
Sandvik, Endre |
title |
Design optimization of offshore construction vessels |
title_short |
Design optimization of offshore construction vessels |
title_full |
Design optimization of offshore construction vessels |
title_fullStr |
Design optimization of offshore construction vessels |
title_full_unstemmed |
Design optimization of offshore construction vessels |
title_sort |
design optimization of offshore construction vessels |
publisher |
NTNU |
publishDate |
2016 |
url |
http://hdl.handle.net/11250/2433681 |
geographic |
Norwegian Sea |
geographic_facet |
Norwegian Sea |
genre |
Norwegian Sea |
genre_facet |
Norwegian Sea |
op_relation |
ntnudaim:15933 http://hdl.handle.net/11250/2433681 |
_version_ |
1766151447052812288 |