Syafitri, Nazwa (2026) Desain Sistem Optimasi Geometri Lambung Kapal dengan Metode Genetic Algorithm (GA). Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Optimasi geometri lambung kapal merupakan salah satu upaya untuk meningkatkan efisiensi hidrodinamika kapal pada tahap desain awal. Penelitian ini bertujuan menyusun sistem optimasi dimensi utama kapal tanker berbasis parent ship dan requirements operasional menggunakan metode Genetic Algorithm, membangun dimensi utama optimum yang memenuhi batasan teknis, serta menyusun model optimasi bentuk lambung berbasis geometri parent ship untuk mengevaluasi pengaruh perubahan bentuk terhadap hambatan, hidrostatik, stabilitas, dan trim. Data yang digunakan terdiri dari 298 kapal tanker pembanding dengan rentang DWT 4.931-18.561 ton dan rata-rata DWT 10.410,7 ton. Data tersebut digunakan untuk menentukan parent ship, menyusun regresi ukuran utama, serta membentuk ruang pencarian optimasi.Penelitian dilakukan dalam dua tahap. Tahap pertama adalah optimasi dimensi utama kapal berupa Lpp, B, H, dan T menggunakan Genetic Algorithm dengan fungsi objektif minimasi hambatan total (RT) yang dihitung menggunakan metode Holtrop-Mennen pada kecepatan dinas 12 knot. Setiap kandidat desain dievaluasi terhadap beberapa constraints, yaitu displacement check, rasio dimensi utama, rentang validitas Holtrop-Mennen, nilai minimum koefisien blok kapal tanker, stabilitas berdasarkan kriteria IMO Intact Stability Code, trim, dan freeboard berdasarkan ICLL 1966. Tahap kedua adalah optimasi bentuk lambung berbasis data offset parent ship menggunakan parameter deformasi β₁, γ₁, α₃, dan α₁, kemudian dimodelkan melalui 3D Shifting Method dan interpolasi PCHIP agar bentuk body plan tetap halus dan mengikuti karakteristik dasar kapal tanker.
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Hull geometry optimization is one approach to improving the hydrodynamic efficiency of a ship during the preliminary design stage. This study aims to develop a main-dimension optimization system for a tanker based on a parent ship and operational requirements using the Genetic Algorithm, to obtain optimum main dimensions that satisfy technical constraints, and to develop a hull-form optimization model based on parent-ship geometry in order to evaluate the effects of hull-form changes on resistance, hydrostatics, stability, and trim. The data used in this study consist of 298 comparison tanker vessels with a DWT range of 4,931-18,561 tons and an average DWT of 10,410.7 tons. These data were used to determine the parent ship, develop the main-dimension regression equations, and define the optimization search space. The study was conducted in two stages. The first stage involved the optimization of the ship’s main dimensions, namely Lpp, B, H, and T, using the Genetic Algorithm with the objective function of minimizing total resistance (RT), calculated using the Holtrop-Mennen method at a service speed of 12 knots. Each design candidate was evaluated against several constraints, including displacement check, main-dimension ratios, Holtrop-Mennen validity range, minimum block coefficient for tankers, stability criteria based on the IMO Intact Stability Code, trim, and freeboard according to ICLL 1966. The second stage involved hull-form optimization based on the parent ship’s offset data using the deformation parameters β₁, γ₁, α₃, and α₁. The optimized hull form was then reconstructed using the 3D Shifting Method and PCHIP interpolation to ensure that the resulting body plan remained smooth and preserved the basic characteristics of a tanker hull.
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