Analisis Stabilitas Rancangan Buoy Dan Penilaian Risiko Tubrukan Kapal Terhadap Sarana Bantu Navigasi Pelayaran (SBNP) Buoy Di APBS

Sihombing, Natan Holong Manumpak Sby (2026) Analisis Stabilitas Rancangan Buoy Dan Penilaian Risiko Tubrukan Kapal Terhadap Sarana Bantu Navigasi Pelayaran (SBNP) Buoy Di APBS. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Alur Pelayaran Barat Surabaya (APBS) merupakan salah satu jalur pelayaran tersibuk di Indonesia yang memiliki tingkat kepadatan lalu lintas kapal dan kompleksitas navigasi yang tinggi. Kondisi tersebut meningkatkan potensi terjadinya allision antara kapal dengan Sarana Bantu Navigasi Pelayaran (SBNP) berupa buoy. Keandalan buoy sebagai penanda navigasi sangat dipengaruhi oleh stabilitas hidrostatis, kemampuan sistem mooring mempertahankan posisinya, serta ketahanan struktur terhadap beban tumbukan kapal. Oleh karena itu, diperlukan suatu pendekatan yang mampu mengevaluasi aspek stabilitas sekaligus menilai tingkat risiko allision secara komprehensif. Penelitian ini bertujuan untuk menganalisis stabilitas rancangan buoy, menentukan frekuensi allision kapal terhadap buoy, mengevaluasi konsekuensi tumbukan terhadap struktur buoy, serta menentukan tingkat risiko menggunakan pendekatan Risk Matrix. Penelitian dilakukan menggunakan data Automatic Identification System (AIS), data batimetri, arus, gelombang, dan angin di wilayah APBS. Perancangan buoy dan sistem mooring mengacu pada IALA Guideline G1066, sedangkan analisis stabilitas dilakukan menggunakan Maxsurf Modeler, Maxsurf Stability, dan Maxsurf Motion pada kondisi normal, maintenance, dan ekstrem. Analisis frekuensi allision dilakukan menggunakan perangkat lunak IWRAP MK2, sedangkan analisis konsekuensi dilakukan melalui simulasi Explicit Dynamic pada ANSYS. Selanjutnya, hasil analisis frekuensi dan konsekuensi diintegrasikan ke dalam Risk Matrix berdasarkan DNV-RP-G101. Hasil penelitian menunjukkan bahwa rancangan buoy memiliki nilai metacentric height (GM) positif pada seluruh kondisi pengujian sehingga memenuhi persyaratan IALA Guideline G1066. Sistem mooring menggunakan transitional mooring, rantai Grade U2 berdiameter 32 mm sepanjang 23–30 m, serta sinker 6000 kg yang mampu menjaga posisi buoy selama operasi. Analisis IWRAP menunjukkan frekuensi allision berada pada kategori rendah. Simulasi ANSYS menunjukkan tidak terjadi deformasi permanen maupun regangan plastis, dengan tegangan maksimum sebesar 50,6 MPa yang masih jauh di bawah tegangan luluh material sebesar 250 MPa, sehingga tidak diperlukan biaya perbaikan akibat tumbukan. Integrasi hasil frekuensi dan konsekuensi menunjukkan bahwa risiko allision kapal terhadap buoy berada pada kategori medium risk (Acceptable Risk), sehingga rancangan buoy dinyatakan aman dan layak digunakan sebagai Sarana Bantu Navigasi Pelayaran di APBS.
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The Surabaya West Acces Channel (Alur Pelayaran Barat Surabaya/APBS) is one of the busiest shipping routes in Indonesia, characterized by high vessel traffic density and complex navigational conditions that increase the likelihood of allision between vessels and Aids to Navigation (AtoN), particularly buoys. The reliability of buoys is influenced by their hydrostatic stability, the effectiveness of the mooring system in maintaining position, and their structural resistance to vessel impact. Therefore, a comprehensive evaluation of these aspects is essential to ensure safe navigation and reliable buoy performance. This study aims to analyze the stability of a buoy design, estimate the frequency of vessel allision, evaluate the structural consequences of allision, and determine the associated risk level. The analysis was conducted using Automatic Identification System (AIS), bathymetric, current, wave, and wind data collected from the APBS area. The buoy and mooring system were designed in accordance with IALA Guideline G1066, while stability analyses were performed using Maxsurf Modeler, Maxsurf Stability, and Maxsurf Motion under normal, maintenance, and extreme operating conditions. The frequency of allision was estimated using IWRAP MK2, whereas the structural consequences were evaluated through Explicit Dynamic simulations in ANSYS. The results of the frequency and consequence analyses were subsequently integrated using the DNV-RP-G101 Risk Matrix. The results demonstrate that the proposed buoy design exhibits a positive metacentric height (GM) under all evaluated conditions, satisfying the stability requirements specified in IALA Guideline G1066. The transitional mooring system, consisting of a 32 mm Grade U2 chain with a length of 23–30 m and a 6,000 kg sinker, effectively maintains the buoy position during operation. The IWRAP analysis indicates a low frequency of vessel allision, while the ANSYS simulation shows no permanent deformation or plastic strain, with a maximum stress of 50.6 MPa, which is well below the material yield strength of 250 MPa. Consequently, no repair cost is required following the simulated allision event. Based on the integration of frequency and consequence, the allision risk is classified as Medium Risk (Acceptable Risk), indicating that the proposed buoy design is safe and suitable for implementation as an Aid to Navigation (AtoN) in the West Surabaya Access Channel.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	APBS, ANSYS, Buoy, IWRAP, Maxsurf, Risk Assessment., Aid to Navigation, ANSYS Explicit Dynamic, buoy, IWRAP MK2, Maxsurf, Risk Assessment
Subjects:	Q Science > Q Science (General) > Q180 Gravitation. Q Science > QC Physics > QC151 Fluid dynamics V Naval Science > VK > VK200 Merchant marine--Safety measures
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User:	Natan Holong Manumpak Sby Sihombing
Date Deposited:	01 Aug 2026 03:01
Last Modified:	01 Aug 2026 03:01
URI:	http://repository.its.ac.id/id/eprint/141516

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