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