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Kajian Teknis Kegagalan Struktural Smit Bracket Akibat Gaya Tarik Towing Line dengan Pendekatan Finite Element Analysis (FEA)
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Date
Authors
Walad, Mudzakir
Journal Title
Journal ISSN
Volume Title
Publisher
Politeknik Negeri Batam
Abstract
Kegiatan eksplorasi minyak dan gas di wilayah perairan Nigeria banyak menggunakan drill barge sebagai sarana
utama operasi. Kapal ini tergolong non self-propelled vessel karena tidak memiliki sistem penggerak utama,
sehingga perpindahannya bergantung pada kapal tunda (tug boat). Proses penarikan menggunakan towing line
menghasilkan gaya tarik besar yang disalurkan melalui smit bracket, yang merupakan komponen struktural yang
berfungsi sebagai penghubung antara towing line dan struktur lambung kapal. Penelitian ini bertujuan untuk
menganalisis kekuatan struktur drill barge yang terpasang smit bracket akibat beban tarik dengan menggunakan
metode finite element analysis (FEA). Perhitungan beban dilakukan berdasarkan standar API RP2A & DNV, yang
mencakup gaya tekan angin, gaya tekan arus, dan gaya hanyut gelombang, kemudian dijumlahkan menjadi total
gaya tarik (PT). Nilai gaya total tersebut digunakan untuk menentukan jenis smit bracket berdasarkan safe working
load (SWL), yang selanjutnya dimasukkan sebagai beban input dalam simulasi menggunakan SolidWorks
Simulation. Hasil penelitian menunjukkan gaya tekan angin sebesar 503.370,5 N, gaya tekan arus sebesar 583.034,8
N, dan gaya hanyut gelombang sebesar 13.758,1 N. Dari gaya total yang diterima oleh drill barge sebesar
1.106.163,3 N atau 112,8 ton. Sehingga masing-masing smit bracket menerima beban tarikan sebesar 85 ton. Dari
hasil simulasi FEA didapatkan tegangan von Mises 175 MPa, regangan 0,000655, dan perpindahan 0,8047 mm.
Berdasarkan hasil tegangan yang diterima smit bracket masih berada di bawah allowable stress 200 MPa menurut
ABS rules, sehingga struktur drill barge dinyatakan aman terhadap gaya tarik yang diterima oleh smit bracket
sebesar 85 ton.
Description
Oil and gas exploration activities in the waters of Nigeria widely utilize drill barges as the main operational platform.
This type of vessel is classified as a non self-propelled vessel because it lacks a main propulsion system therefore,
its movement depends on tugboats. The towing process using a towing line generates significant tensile forces that
are transmitted through the smit bracket, a structural component that functions as a connection between the towing
line and the ship’s hull structure. This study aims to analyze the structural strength of a drill barge equipped with
smit brackets under towing loads using the finite element analysis (FEA) method. Load calculations are conducted
in accordance with API RP2A and DNV standards, including wind force, current pressure force, and wave drift force,
which are then combined to obtain the total towing force (PT). The total force is used to determine the appropriate
smit bracket type based on its safe working load (SWL) and is subsequently applied as an input load in SolidWorks
Simulation. The results show that the wind force is 503,370.5 N, the current pressure force is 583,034.8 N, and the
wave drift force is 13,758.1 N. The total towing force acting on the drill barge is 1,106,163.3 N, equivalent to 112.8
tons, resulting in a towing load of 85 tons on each smit bracket. The FEA results indicate a von Mises stress of 175
MPa, a strain of 0.000655, and a displacement of 0.8047 mm. Since the resulting stress is below the allowable stress
limit of 200 MPa specified by ABS rules, the drill barge structure is considered safe under an 85-ton towing load
acting on the smit bracket.
Citation
IEEE