Vulnerability Assessment for Excessive Acceleration Failure Mode of an Indonesian Ro-Ro Ferry by Model Experiment
The Indonesian ro-ro ferries have a large breadth-to-draught ratio and metacentric height. The passenger and crew accommodations are located at a significantly higher position from the roll axis because the main deck is used as a vehicle deck. The damping factor corresponding to criteria levels 1 an...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Universitas Indonesia
2025-01-01
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| Series: | International Journal of Technology |
| Subjects: | |
| Online Access: | https://ijtech.eng.ui.ac.id/article/view/6315 |
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| Summary: | The Indonesian ro-ro ferries have a large breadth-to-draught ratio and metacentric height. The passenger and crew accommodations are located at a significantly higher position from the roll axis because the main deck is used as a vehicle deck. The damping factor corresponding to criteria levels 1 and 2 of the excessive acceleration failure mode given by the International Maritime Organization (IMO) may not be applied to the Indonesian ro-ro ferry due to the large breadth-to-draught ratio and the ratio between the distance of the center of gravity from the sea surface and ship draught. An alternative method to determine the damping factors becomes important in applying the criteria for the Indonesian ro-ro ferries. The roll decay test is used as the alternative method to estimate the non-dimensional logarithmic decrement of roll decay and the damping coefficients to assess the stability base on the excessive acceleration criteria. The long-term probability index corresponding to the criteria level 2 is calculated by using the limited scatter wave of IMO. The non-dimensional logarithmic decrement of roll decay obtained by the model experiment is smaller than that obtained by the formula of IMO when the roll angle is smaller than 17.45 degrees. The bilge keels significantly reduce the long-term probability index. As a result, the ship complies with the criteria for excessive acceleration failure mode, even though the height of the accommodations from the roll axis is greater than 80% of the ship breadth and the significant wave height is greater than 7.5 meters. |
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| ISSN: | 2086-9614 2087-2100 |