Analisis Numerik Seakeeping Kapal Crew Boat Orela Dengan Variasi Periode Gelombang Pada Kecepatan Operasional Kapal

Rofidayanti, Afifah (2022) Analisis Numerik Seakeeping Kapal Crew Boat Orela Dengan Variasi Periode Gelombang Pada Kecepatan Operasional Kapal. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Perilaku gerakan (seakeeping) di laut dipengaruhi oleh beberapa hal diantaranya kecepatan, bentuk lambung kapal, dan arah datangnya gelombang (heading angle). Dalam tugas akhir ini, kapal crew boat Orela dianalisa dengan menggunakan metode 3D Diffraction untuk mendapatkan respon gerak kapal pada gelombang reguler. Pada penelitian ini menggunakan data input diantaranya sudut datang gelombang (μ) terhadap kapal yaitu sebesar 180o, variasi periode gelombang yaitu 2.58 s, 4.12 s, 5.67 s, dan 7.22 s. Simulasi dilakukan pada ketinggian gelombang 0.5 meter serta saat kapal pada kondisi diam (Vs = 0 knot) dan pada kondisi operasional (Vs = {3 knot, 6 knot, 9 knot, 12 knot, 15 knot, dan 18}). Penelitian ini memfokuskan untuk analisa perilaku gerak kapal crew boat Orela pada periode gelombang dan laju kecepatan kapal yang berbeda. Analisa numerik ini dilakukan untuk mengetahui seakeeping kapal dan membandingkannya dengan hasil eksperimen yang telah dilakukan sebelumnya. Berdasarkan hasil yang diperoleh nilai seakeeping kapal memenuhi kriteria dari NORDFORSK 1987 hingga pada kecepatan 9 knot, mulai pada kecepatan 12 knot sudah tidak memenuhi dari kriteria tersebut. Kemudian untuk perbandingan dengan eksperimen, diperoleh nilai defiasi elevasi untuk gerakan heave sebesar 4.4762 % dan untuk gerakan pitch menghasilkan angka yang cukup tinggi yaitu 8.1715%. Adapun untuk operabilitas tingkat kenyamanan dari crew saat berada di atas kapal memiliki indeks MSI sebesar 0% untuk kecepatan 0 knot sampai 6 knot, dan memiliki indeks MSI 4.46% untuk kecepatan 18 knot.
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Crew boat is a marine transportation for the mobility of offshore workers as well as logistical supply needed for the offshore platform. Crew boat KCT-1901 is categorized as a planing boat with body hard chine. KCT-1901 needs an added power when it is sailing through a seaway. The reason behind this is because when a ship sails through a seaway, the ships experienced a heave and pitch motion that results in added resistance and added EHP. This study aims to predict the amount of added resistance and added EHP using the computational fluid dynamic (CFD) simulation free surface multi fluid method in calm water and regular wave operating conditions with several Froude number (Fr) and wave periods. Verification CFD using Savitsky method for calm water and experiment for regular wave. The largest total resistance value with CFD on calm water is at Fr 0.72 of 38.978 kN. The average percentage deviation of total resistance with CFD and Savitsky method on calm water is 0.07% and CFD with experiments on regular waves is 4.37%. The largest total resistance value with CFD on regular waves occurs at Fr 0.72 with wave period 2.58 seconds of 26.626 kN. The largest added resistance value in this study occurs at Fr 0.72 which operates in regular waves as high as 0.5 m with a period of 2.58 seconds of 26.626 kN. The characteristics of the added resistance value of KCT-1901 in this study are directly proportional to the speed of the ship and inversely proportional to the wave period. While the largest added EHP value is found at Fr 0.72 regular with wave period 2.58 seconds of 246.553 HP.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Crew boat, Seakeeping, Simulasi numerik, Operabilitas, Crew boat, Seakeeping, Numerical simulation, Operability
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	Mr. Marsudiyana -
Date Deposited:	06 Nov 2025 06:43
Last Modified:	06 Nov 2025 06:43
URI:	http://repository.its.ac.id/id/eprint/128756

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