Gerco; Hooijmans Hagesteijn, Patrick; van der Meij
Proceedings of the ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering, OMAE2016, Busan, South Korea, 2016.
@conference{Hagesteijn2016,
title = {Correlation allowances in model tests results: A delicate balance between performance, accuracy and commercial interests?},
author = {Hagesteijn, Gerco; Hooijmans, Patrick; van der Meij, Karola},
url = {http://www.marin.nl/web/Publications/Papers/Correlation-allowances-in-model-tests-results-A-delicate-balance-between-performance-accuracy-and-commercial-interests.htm},
year = {2016},
date = {2016-06-19},
booktitle = {Proceedings of the ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering, OMAE2016, Busan, South Korea},
abstract = {Model tests at ballast and design draught are used to
convert the sea trial results from the ballast trial draught to the
contractual design draught. Correlation allowances in model test
results and their effect on the trial performance prediction are of
major importance. Nowadays it is not only typical to verify the
contract speed but also the EEDI certification requires a
verification of the speed power performance of the vessel. The
use of a to favorable CA-value may lead to attractive
performance figures, but also leads to higher fuel consumption
figures than expected. Furthermore the design point of the
propeller is affected, which leads to a too low light running
margin and in some cases to erosive cavitation.
During a study, large spreading in the values of the
correlation allowances for design draughts have been found for
merchant vessels tested at different model test institutes, but at
ballast trial draught the spreading is much less. Can it happen
that some institutes select favorable correlations allowances on
the basis of inaccurate trial data of shipyards? Or should we
accept a large spreading in correlation allowances and have
these indeed been confirmed by sea trials at design draught?
This paper will present a discussion using the experience of a
large full scale trial database as well as the accuracy of model
and full scale tests.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
convert the sea trial results from the ballast trial draught to the
contractual design draught. Correlation allowances in model test
results and their effect on the trial performance prediction are of
major importance. Nowadays it is not only typical to verify the
contract speed but also the EEDI certification requires a
verification of the speed power performance of the vessel. The
use of a to favorable CA-value may lead to attractive
performance figures, but also leads to higher fuel consumption
figures than expected. Furthermore the design point of the
propeller is affected, which leads to a too low light running
margin and in some cases to erosive cavitation.
During a study, large spreading in the values of the
correlation allowances for design draughts have been found for
merchant vessels tested at different model test institutes, but at
ballast trial draught the spreading is much less. Can it happen
that some institutes select favorable correlations allowances on
the basis of inaccurate trial data of shipyards? Or should we
accept a large spreading in correlation allowances and have
these indeed been confirmed by sea trials at design draught?
This paper will present a discussion using the experience of a
large full scale trial database as well as the accuracy of model
and full scale tests.
Hooijmans, Patrick; Hagesteijn, Gerco
Correlation allowances in model tests results: Truth or dare? Conference
Proceedings of the PRADS2013, CECO, Changwon City, Korea, Practical Design of Ships and Other Floating Structures 2013.
@conference{Hooijmans2013,
title = {Correlation allowances in model tests results: Truth or dare?},
author = {Patrick Hooijmans and Gerco Hagesteijn},
url = {http://test.sssri-marin.com/wp-content/uploads/2016/01/Paper-Correlation-allowances-in-model-tests-results-V1.0.pdf},
year = {2013},
date = {2013-10-20},
booktitle = {Proceedings of the PRADS2013, CECO, Changwon City, Korea},
organization = {Practical Design of Ships and Other Floating Structures},
abstract = {Model tests at ballast and design draught are used to convert the sea trial results from the ballast trial draught to the contractual design draught. Correlation allowances in model test results and their effect on the trial performance prediction are of major importance. A large spreading in the values of the correlation allowances for design draughts have been found for merchant vessels tested at different model test institutes, but at ballast trial draught the spreading is much less. Can it happen that some institutes on purpose select favourable correlations allowances? Or should we accept a large spreading in correlation allowances and have these indeed been confirmed by sea trials at design draught? Some statistical analysis will be presented, as well as a discussion on the accuracy of model and full scale tests.
},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
2016
Gerco; Hooijmans Hagesteijn, Patrick; van der Meij
Proceedings of the ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering, OMAE2016, Busan, South Korea, 2016.
Abstract | Links | BibTeX | Tags: allowance, analysis, correlation, extrapolation, merchant, prediction, RANS
@conference{Hagesteijn2016,
title = {Correlation allowances in model tests results: A delicate balance between performance, accuracy and commercial interests?},
author = {Hagesteijn, Gerco; Hooijmans, Patrick; van der Meij, Karola},
url = {http://www.marin.nl/web/Publications/Papers/Correlation-allowances-in-model-tests-results-A-delicate-balance-between-performance-accuracy-and-commercial-interests.htm},
year = {2016},
date = {2016-06-19},
booktitle = {Proceedings of the ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering, OMAE2016, Busan, South Korea},
abstract = {Model tests at ballast and design draught are used to
convert the sea trial results from the ballast trial draught to the
contractual design draught. Correlation allowances in model test
results and their effect on the trial performance prediction are of
major importance. Nowadays it is not only typical to verify the
contract speed but also the EEDI certification requires a
verification of the speed power performance of the vessel. The
use of a to favorable CA-value may lead to attractive
performance figures, but also leads to higher fuel consumption
figures than expected. Furthermore the design point of the
propeller is affected, which leads to a too low light running
margin and in some cases to erosive cavitation.
During a study, large spreading in the values of the
correlation allowances for design draughts have been found for
merchant vessels tested at different model test institutes, but at
ballast trial draught the spreading is much less. Can it happen
that some institutes select favorable correlations allowances on
the basis of inaccurate trial data of shipyards? Or should we
accept a large spreading in correlation allowances and have
these indeed been confirmed by sea trials at design draught?
This paper will present a discussion using the experience of a
large full scale trial database as well as the accuracy of model
and full scale tests.},
keywords = {allowance, analysis, correlation, extrapolation, merchant, prediction, RANS},
pubstate = {published},
tppubtype = {conference}
}
convert the sea trial results from the ballast trial draught to the
contractual design draught. Correlation allowances in model test
results and their effect on the trial performance prediction are of
major importance. Nowadays it is not only typical to verify the
contract speed but also the EEDI certification requires a
verification of the speed power performance of the vessel. The
use of a to favorable CA-value may lead to attractive
performance figures, but also leads to higher fuel consumption
figures than expected. Furthermore the design point of the
propeller is affected, which leads to a too low light running
margin and in some cases to erosive cavitation.
During a study, large spreading in the values of the
correlation allowances for design draughts have been found for
merchant vessels tested at different model test institutes, but at
ballast trial draught the spreading is much less. Can it happen
that some institutes select favorable correlations allowances on
the basis of inaccurate trial data of shipyards? Or should we
accept a large spreading in correlation allowances and have
these indeed been confirmed by sea trials at design draught?
This paper will present a discussion using the experience of a
large full scale trial database as well as the accuracy of model
and full scale tests.
2013
Hooijmans, Patrick; Hagesteijn, Gerco
Correlation allowances in model tests results: Truth or dare? Conference
Proceedings of the PRADS2013, CECO, Changwon City, Korea, Practical Design of Ships and Other Floating Structures 2013.
Abstract | Links | BibTeX | Tags: allowance, analysis, correlation, extrapolation, merchant, prediction
@conference{Hooijmans2013,
title = {Correlation allowances in model tests results: Truth or dare?},
author = {Patrick Hooijmans and Gerco Hagesteijn},
url = {http://test.sssri-marin.com/wp-content/uploads/2016/01/Paper-Correlation-allowances-in-model-tests-results-V1.0.pdf},
year = {2013},
date = {2013-10-20},
booktitle = {Proceedings of the PRADS2013, CECO, Changwon City, Korea},
organization = {Practical Design of Ships and Other Floating Structures},
abstract = {Model tests at ballast and design draught are used to convert the sea trial results from the ballast trial draught to the contractual design draught. Correlation allowances in model test results and their effect on the trial performance prediction are of major importance. A large spreading in the values of the correlation allowances for design draughts have been found for merchant vessels tested at different model test institutes, but at ballast trial draught the spreading is much less. Can it happen that some institutes on purpose select favourable correlations allowances? Or should we accept a large spreading in correlation allowances and have these indeed been confirmed by sea trials at design draught? Some statistical analysis will be presented, as well as a discussion on the accuracy of model and full scale tests.
},
keywords = {allowance, analysis, correlation, extrapolation, merchant, prediction},
pubstate = {published},
tppubtype = {conference}
}