Analisis Mooring Dan Fatigue Pada Sistem Hybrid Floating Breakwater Dan Sistem Aquaculture

Putri, Raden Nadia Sukarsana (2026) Analisis Mooring Dan Fatigue Pada Sistem Hybrid Floating Breakwater Dan Sistem Aquaculture. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Wilayah pesisir memerlukan sistem perlindungan yang mampu mereduksi energi gelombang tanpa mengganggu aktivitas di sekitarnya. Salah satu alternatif yang banyak dikembangkan adalah floating breakwater tipe pontoon yang memiliki fleksibilitas tinggi serta dapat diintegrasikan dengan sistem aquaculture. Penelitian ini bertujuan untuk menganalisis karakteristik Response Amplitude Operator (RAO), respon sistem mooring, distribusi tegangan, serta umur kelelahan (fatigue life) pada hybrid floating breakwater dengan penambahan struktur aquaculture. Pemodelan hidrodinamika dilakukan menggunakan ANSYS AQWA untuk memperoleh karakteristik RAO dan gaya tarik (section tension) pada sistem mooring, sedangkan analisis tegangan dan kelelahan dilakukan menggunakan ANSYS Mechanical. Sistem mooring dimodelkan menggunakan empat buah tali Dyneema SK75 berdiameter 10 mm dengan konfigurasi taut mooring. Analisis fatigue dilakukan menggunakan pendekatan Stress-Life (S–N Curve) dan aturan akumulasi kerusakan Palmgren-Miner (Miner's Rule). Hasil validasi menunjukkan kesalahan hidrostatik sebesar 0.24%, sehingga model dinyatakan layak digunakan. Hasil analisis RAO menunjukkan bahwa respons struktur dipengaruhi oleh frekuensi gelombang dan arah datang gelombang (heading), dimana gerakan surge dan pitch memberikan respons terbesar pada heading 0°, sway dan roll pada heading 90°, sedangkan yaw memberikan respons terbesar pada heading 45°. Analisis mooring menunjukkan bahwa penambahan struktur aquaculture meningkatkan distribusi gaya tarik pada sistem mooring, sedangkan penggunaan slope berporos mampu mereduksi sebagian beban yang diteruskan menuju mooring line. Seluruh nilai section tension masih berada di bawah Minimum Breaking Load (MBL) tali Dyneema SK75 sehingga sistem mooring dinyatakan aman. Analisis fatigue menghasilkan fatigue life sebesar 83.03 tahun atau 327.294.000 siklus dengan fatigue damage sebesar 0.602, sehingga melebihi umur rencana struktur selama 50 tahun. Hasil penelitian menunjukkan bahwa konfigurasi hybrid floating breakwater dengan sistem aquaculture masih memenuhi aspek hidrodinamika, kekuatan sistem mooring, dan ketahanan terhadap pembebanan siklik, sehingga berpotensi diterapkan sebagai sistem perlindungan pantai multifungsi.
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Coastal areas require protection systems capable of reducing wave energy while maintaining operational safety and supporting sustainable marine activities. One promising alternative is a pontoon-type floating breakwater integrated with an aquaculture system. This study aims to investigate the Response Amplitude Operator (RAO) characteristics, mooring response, stress distribution, and fatigue life of a hybrid floating breakwater equipped with an aquaculture structure. Hydrodynamic simulations were carried out using ANSYS AQWA to obtain the RAO characteristics and section tension of the mooring system, while structural stress and fatigue analyses were performed using ANSYS Mechanical. The mooring system consisted of four 10 mm Dyneema SK75 ropes arranged in a taut mooring configuration. Fatigue assessment was conducted using the Stress-Life (S–N Curve) approach together with the Palmgren-Miner cumulative damage rule. The hydrostatic validation yielded an error of 0.24%, indicating that the numerical model was sufficiently accurate for further analysis. The RAO results demonstrate that the structural response is governed by wave frequency and wave heading. The largest responses occurred in surge and pitch motions at a 0° heading, sway and roll motions at a 90° heading, and yaw motion at a 45° heading. The mooring analysis indicates that the addition of the aquaculture structure increases the load transferred to the mooring system, whereas the porous slope configuration reduces the transmitted hydrodynamic loads. All calculated section tensions remain below the Minimum Breaking Load (MBL) of the Dyneema SK75 mooring rope, confirming the structural safety of the mooring system. Furthermore, the fatigue analysis predicts a fatigue life of 83.03 years or 327,294,000 cycles, with a fatigue damage value of 0.602, exceeding the design life requirement of 50 years. Overall, the proposed hybrid floating breakwater integrated with an aquaculture system demonstrates satisfactory hydrodynamic performance, mooring integrity, and long-term fatigue resistance, indicating its potential as a multifunctional coastal protection system.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Pemecah Gelombang, Tali Tambat, Umur Kelelahan, Keramba, Floating Breakwater, Mooring, Fatigue, Aquaculture
Subjects:	S Agriculture > SH Aquaculture. Fisheries. Angling T Technology > TA Engineering (General). Civil engineering (General) > TA418.38 Materials--Fatigue. T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL671.6. Materials--Fatigue. V Naval Science > VK > VK361 Mooring of ships. Dry docks
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Raden Nadia Sukarsana Putri
Date Deposited:	20 Jul 2026 06:43
Last Modified:	20 Jul 2026 06:45
URI:	http://repository.its.ac.id/id/eprint/135752

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