Analisis Umur Kelelahan Pada Anchor Chain Single Point Mooring 3

Arifannisa, Nabila (2016) Analisis Umur Kelelahan Pada Anchor Chain Single Point Mooring 3. Undergraduate thesis, Institut Teknologi Sepuluh Nopember Surabaya.

[img]
Preview
Text
4312100099-Undergraduate_Thesis.pdf - Published Version

Download (4MB) | Preview

Abstract

Dalam tugas akhir ini penulis menganalisis umur kelelahan struktur Anchor Chain yang digunakan untuk menambat Single Point Mooring (SPM) 3 ke dasar laut. Analisis ini dilakukan untuk mengetahui masa operasi Anchor Chain dengan mempertimbangkan umur kelelahan struktur. Penelitian dimulai dengan melakukan analisis mengenai pergerakan FSO Arco Ardjuna dan SPM 3 akibat beban lingkungan dalam keadaan free floating dan tertambat untuk mendapatkan besar tension pada anchor legs dan hawser.. Setelah itu dilakukan analisis global dengan memasukkan beban tension dan berat struktur Anchor Chain berdasarkan ketentuan ABS untuk mendapatkan besar tegangan yang diterima masing-masing Anchor Chain yang ada. Setelah itu dilakukan perhitungan stress range dan menghitung Cumulative Damage menggunakan metode S-N Curve berdasarkan hukum kegagalan Palmgren Miner dengan mengestimasi kegagalan menggunakan metode simplified fatigue analysis. Dari hasil permodelan numerik yang dilakukan, didapatkan bahwa perilaku gerak terbesar pada SPM yaitu sebesar 3.12 deg/m untuk gerakan roll saat kondisi FSO muatan full load dan 2.98 m/m untuk gerakan heave kondisi FSO muatan full load. Untuk hasil tension terbesar pada anchor legs yaitu 684.109 kN pada heading angle 0o dengan safety factor 10.38. Setelah itu didapatkan tegangan maksimum pada struktur Anchor Chain sebesar 150.53 Mpa dan deformasi terbesar 1.0858 mm. Berdasarkan tegangan maksimum tersebut umur kelelahan Anchor Chain yaitu 94 tahun selama umur operasi ===========================================================================================Fatigue life analysis is carried out in the Anchor Chain of Single Point Mooring (SPM) 3. The Anchor Chain is applied to connect the SPM into the seabed. The analsys is performed to know the operation time of the anchor chain in terms of the structure fatigue life. This case study begins with the motion analysis of FSO Arco Ardjuna and SPM 3 due to the environment load in free floating and moored condition, subsequently the tension of anchor legs and hawser can be determined due to moored condition. As well as the maximum tension of the Anchor Legs. Based on the environmental load and the tension of anchor legs, the local structure analysis of Anchor Chain was perfomed. The results have to comply with the requirement of ABS rules. Stress range and Cumulative Damage calculation was applied using to S-N Curve method based of Palmgren Miner’s rules with estimate the cumulative damage using the method of simplified method. Based on the modelling, it is known that the maximum motion of SPM 3 is 3.12 deg/m in roll at full load condition of FSO Arco Ardjuna and 2.98 m/m in heave at the full load condition of FSO Arco Ardjuna. Based on the simulation carried out to obtain the maximum anchor legs tension obtain on chain 1 is 684.109 kN at 0o heading angle. While, the maximum stress that occurs on the analysis of the local structure of anchor chain is 150.53 Mpa and the deformation is 1.0858 mm. Based on the maximum stress, obtaines the result of fatigue life of anchor chain is 94 years as long as the operation

Item Type: Thesis (Undergraduate)
Additional Information: RSKe 627.22 Ari a-1
Uncontrolled Keywords: Anchor Chain, Damage Cumulative, Maximum Principal Stress, Stress Range, Simplified Fatigue Analysis
Subjects: V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM761 Stability of ships
Divisions: Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User: EKO BUDI RAHARJO
Date Deposited: 30 Mar 2020 13:52
Last Modified: 30 Mar 2020 13:52
URI: http://repository.its.ac.id/id/eprint/75609

Actions (login required)

View Item View Item