Analisis Umur Lelah Kapal Tongkang Dengan Penambahan Crawler Crane Menggunakan Metode Simplified Fatigue Analysis

Batosai, Joan Rike (2025) Analisis Umur Lelah Kapal Tongkang Dengan Penambahan Crawler Crane Menggunakan Metode Simplified Fatigue Analysis. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Barge merupakan kapal yang digunakan untuk mengangkat dan memindahkan beban berat di wilayah perairan. Dalam penelitian ini, Barge dianalisis dengan penambahan crawler crane, yaitu jenis crane yang bergerak menggunakan sistem track untuk menjaga stabilitas saat beroperasi. Beban operasional dari crawler crane ini berpotensi menimbulkan tegangan berulang yang dapat menyebabkan kelelahan pada struktur kapal. Fokus utama analisis diarahkan pada struktur stopper crawler crane. Analisis dilakukan menggunakan metode elemen hingga (FEA) untuk memperoleh distribusi tegangan maksimum dan minimum pada setiap kondisi operasi. Variasi pembebanan ditinjau berdasarkan sudut slewing crane sebesar 0°, 45°, dan 90°, serta variasi beban operasional sebesar 100%, 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20%, dan 10% dari lifting load. Lokasi titik yang ditinjau adalah pada 6 stopper yang menahan crawler crane. Nilai rentang tegangan yang diperoleh digunakan dalam perhitungan kerusakan kumulatif akibat kelelahan menggunakan metode Palmgren-Miner sesuai panduan American Bureau of Shipping (ABS). Hasil analisis menunjukkan bahwa semua struktur stopper masih memenuhi batas ketahanan terhadap kelelahan. Nilai D Cumulative pada setiap pembebanan tidak melebihi 1 dengan nilai paling kecil 0,000000422 dan nilai paling besar 0,008952225. Dari hasil nilai D Cumulative dapat dihitung umur lelah titik yang ditinjau. Dengan menggunakan design life 25 tahun didapat hasil umur lelah terlama adalah 59225086,9 tahun dan umur lelah terpendek adalah 58686,01 tahun. Hasil umur lelah kapal menunjukkan jarak yang jauh dengan design life karena variasi beban yang sedikit. Oleh karena itu, disarankan agar variasi beban diperbanyak sehingga nilai D Cumulative dapat meningkat.
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A barge was a vessel used to lift and transfer heavy loads in marine areas. In this study, the barge was analyzed with the addition of a crawler crane, a type of crane that moved on tracks to maintain stability during operation. The operational loads from the crawler crane had the potential to generate cyclic stresses that could cause fatigue in the vessel’s structure. The main focus of the analysis was directed at the crawler-crane stopper structures. Finite Element Analysis (FEA) was carried out to obtain the maximum and minimum stress distributions under each operating condition. Load variations were examined at crane slewing angles of 0°, 45°, and 90°, together with operational load levels of 100 %, 90 %, 80 %, 70 %, 60 %, 50 %, 40 %, 30 %, 20 %, and 10 % of the lifting load. The points of interest lay on six stoppers supporting the crawler crane. The resulting stress ranges were used to calculate cumulative fatigue damage with the Palmgren–Miner rule, following American Bureau of Shipping (ABS) guidelines. The analysis results showed that all stopper structures remained within acceptable fatigue limits. The cumulative damage (D) values for every loading case stayed below 1, with the smallest value being 0,000000422 and the largest 0,008952225. From these D values, the fatigue life of each examined point was determined. Assuming a design life of 25 years, the longest estimated fatigue life was 59.225.086,9 years, while the shortest was 58.686,01 years. The large gap between the calculated fatigue lives and the design life indicated that the limited load variations produced very low damage values. Therefore, it was recommended to broaden the range of load variations so that the cumulative damage values would be more representative.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Crane Barge, Crawler Crane, Simplified Fatigue Analysis Crane Barge, Crawler Crane, Simplified Fatigue Analysis
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:	Joan Rike Batosai
Date Deposited:	05 Aug 2025 08:42
Last Modified:	05 Aug 2025 08:42
URI:	http://repository.its.ac.id/id/eprint/127479

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