Analisis Umur Kelelahan Kapal Akibat Gelombang Siklik dengan Pendekatan Interaksi Fluida Struktur

Limbong, Nathaniel Richard Rupang (2026) Analisis Umur Kelelahan Kapal Akibat Gelombang Siklik dengan Pendekatan Interaksi Fluida Struktur. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kapal tongkang, yang berperan penting dalam mengangkut beban berat, tetapi rentan terhadap kondisi cuaca laut yang keras, menghadapi risiko kerusakan struktur akibat beban gelombang yang kompleks. Penelitian ini bertujuan untuk menganalisis dampak gelombang siklik dan faktor-faktor terkait terhadap umur kelelahan struktur kapal tongkang menggunakan pendekatan interaksi fluida-struktur (FSI) dua arah. Dengan pendekatan pemodelan numerik yang menyeluruh, penelitian tersebut mengevaluasi dampak dari berbagai kondisi seperti muatan penuh, setengah, dan kosong, tinggi gelombang sebesar 1 m dan 1,5 m, jarak penegar yaitu 572 mm, 685 mm, dan 762 mm, serta pengurangan ketebalan pelat terhadap tegangan, deformasi, dan akhirnya umur kelelahan kapal. Hasil penelitian menunjukkan bahwa kondisi muatan penuh merupakan faktor utama yang secara signifikan mempercepat keausan struktur hingga melebihi batas umur operasional 25 tahun, selain itu pengurangan pelat juga berkontribusi besar dalam menurunkan umur kelelahan. Sementara itu, peningkatan jarak penegar dianggap memiliki potensi untuk meningkatkan umur kelelahan kapal dengan cara mendistribusikan beban tegangan secara lebih merata. Simulasi FSI dua arah berhasil menggambarkan respons dinamis struktur terhadap beban gelombang secara akurat, termasuk pergeseran waktu antara puncak beban gelombang dan respons tegangan serta deformasi, hal yang tidak dapat dicakup oleh metode analisis statis biasa. Keseluruhan proses analisis menunjukkan bahwa pendekatan FSI dua arah sangat penting dalam memprediksi umur kelelahan kapal tongkang secara akurat, terutama dalam kondisi lingkungan laut yang dinamis, serta mengidentifikasi kondisi operasi yang berisiko tinggi yang memerlukan perhatian khusus dalam perencanaan perawatan dan operasional kapal.
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Barges, which play an important role in transporting heavy loads but are vulnerable to harsh sea conditions, face the risk of structural damage due to complex wave loads. This study aims to analyze the impact of cyclic waves and related factors on the fatigue life of barge structures using a two-way fluid-structure interaction (FSI) approach. Using a comprehensive numerical modelling approach, the study evaluates the impact of various conditions such as full, half, and empty loads, wave heights of 1 m and 1.5 m, strut distances of 572 mm, 685 mm, and 762 mm, and plate thickness reduction on stress, deformation, and ultimately the fatigue life of the ship. The results of the study show that full load conditions are a major factor that significantly accelerates structural wear beyond the 25-year operational life limit. In addition, plate thinning also contributes significantly to reducing fatigue life. Meanwhile, increasing the strut spacing is considered to have the potential to increase the fatigue life of the vessel by distributing the stress load more evenly. The two-way FSI simulation successfully described the dynamic response of the structure to wave loads accurately, including the time shift between the wave load peak and the stress and deformation response, which cannot be covered by conventional static analysis methods. The entire analysis process shows that the two-way FSI approach is very important in accurately predicting the fatigue life of barges, especially in dynamic marine environments, as well as identifying high-risk operating conditions that require special attention in ship maintenance and operational planning.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Kapal Tongkang, Gelombang, Kelelahan, Interaksi Fluida-Struktur, Metode Elemen Hingga, Barge, Wave, Fatigue, Fluid-Structure Interaction, Finite Element Method
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM156 Naval architecture
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36101-(S2) Master Thesis
Depositing User:	Nathaniel Richard Rupang Limbong
Date Deposited:	04 Feb 2026 01:15
Last Modified:	04 Feb 2026 01:15
URI:	http://repository.its.ac.id/id/eprint/131964

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