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Romadhoni
Jurusan Teknik Perkapalan Politeknik Negeri Bengkalis
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Numerical Evaluation of Post-Deck-Flooding IMO Criteria for a Low-Freeboard Harbor Tugboat Romadhoni; Budhi Santoso; Polaris Nasution
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 2 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i2.6438

Abstract

Low-freeboard harbour tugboats often work in quartering seas where a single boarding wave can leave water sloshing on deck and erode their transverse stability. This paper evaluates how much of that erosion a 28 m tug can tolerate before it breaks the intact-stability limits of IMO MSC 267(85). Using only the vessel’s trim-and-stability booklet, the study superimposes thin sheets of retained water—0 to 0.35 m deep, with drainage coefficients K = 0.50–0.90—on three loading states: fully laden, half-load and lightship. For every depth and K pair the corrected righting-arm curve, metacentric height and righting-area reserves are recomputed; a limiting-KG curve and a K–depth PASS/FAIL heat-map are then produced, and wave data from BMKG (2020–2024) are used to estimate the yearly probability of exceeding the IMO limits. Calculations show that in the full-departure condition the first IMO criterion fails when only 0.12 m of water is trapped at K = 0.70, whereas the threshold rises to 0.24 m at half-load and 0.31 m in lightship. Lowering K to 0.55—achievable by higher bulwarks or larger freeing ports—moves the failure boundary rightward by nearly 50 % and cuts the annual exceedance probability below 10-3.
Assessment Seakeeping Performance And Operability Model A Fast Craft Using Axe Bow Romadhoni Romadhoni; Budhi Santoso; IK.A Pria Utama
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 4 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i4

Abstract

Hull shape affects the characteristics of movement and operability ship itself. Operability ship is at sea the amount of time during which the structure is capable of operating in accordance with the criteria established and high correlation to wave in which criteria will be exceeded. In the research will be carried out analysis of three degrees of freedom of movement and pitch roll heave against the ship model-type crew boat planing hull and AXE Bow size 38 meters on a regular wave with future parameter (heading, speed, mass body, radius gyration, damping and etc.) are presented in the form of graphic images Response Amplitude Operator (RAO). Motion prediction in regular waves has been performed by running a mathematical model developed on the basis of a 3-liner potential theory, and further transformed into the motion in irregular waves through the spectral analysis. The calculation is performed with the help of software computing HydroSTAR Ver.7.1 will be compared with Maxsuft software. This latter analysis was conducted for all level of intensities by referring to the wave scatter data for Natuna Sea, and then correlated to the operational criteria. Results of evaluation exhibits that at full load, operational crew boat could be carried out at significant wave heights Hs ranging from 0.245m up to 3.745m, which has a proportion of occurrence as much as 97.02% to model planing hull and as much as 98.72% to model AXE Bow. Crew boat operation would not be safely conducted at wave heights higher than those, in which their occurrence in Natuna Sea is only 2.720%, model hull planing and is only 0.14% model AXE Bow
Co-Authors Akmal Lazuardy Aprizawati Aprizawati Ariany, Zulfaidah Arief Teguh Pribadi Bobi Satria Bobi Satria Budhi Santoso Budhi Santoso Fazrian Fazrian Hardiyanto Hardiyanto, Hardiyanto I.K.A.P Utama IK.A Pria Utama M Ikhsan M Ikhsan Muahammad Yudi Ismail Marzuki Nasution, Polaris Nur Rahmani Nurhasanah Nurhasanah Pardi Pardi Polaris Nasution Rizali Santoso, Budhi Septi Ayu Angrayni Sidik Purwoko Supriyadi Supriyadi Suzdayan Suzdayan Suzdayan Zulfaidah Ariany Zulyani Zulyani