Studi Variasi Heave Plate Pada SPAR Tipe Truss Dengan Sistem Tambat Taut

Aditia, Deni Ponco (2025) Studi Variasi Heave Plate Pada SPAR Tipe Truss Dengan Sistem Tambat Taut. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini menganalisis karakteristik respons dinamis dan performa sistem penambatan Truss SPAR dengan variasi dimensi heave plate pada kondisi terapung bebas dan tertambat, di bawah pembebanan gelombang acak 100 tahunan. Melalui analisis Respons Amplitude Operator (RAO) pada kondisi terapung bebas, diidentifikasi (variasi 2) menunjukkan amplifikasi resonansi yang signifikan pada moda heave (22.937 m/m) dan pitch (14.022 deg/m), sementara (variasi 4) menunjukkan respons RAO yang paling terkontrol pada moda heave (2.782 m/m) dan pitch (0.127 deg/m). Pada kondisi tertambat, analisis nilai Root Mean Square (RMS) dari respons spektral menunjukkan bahwa gerakan surge relatif tidak terpengaruh (RMS berkisar 3.88 x 10-2 m hingga 3.91 x 10-2 m), sedangkan heave plate efektif dalam meredam gerakan vertikal dan rotasional. Nilai RMS heave terendah tercatat pada variasi 4 (4.75 x 10-5 m), sementara nilai RMS pitch terendah ditemukan pada variasi 5 (2.63 x 10-4 deg). Evaluasi tegangan maksimum mooring lines pada kondisi ekstrem 100 tahunan mengonfirmasi bahwa seluruh variasi berhasil memenuhi kriteria keamanan API RP 2SK (SF ≥ 1.67). Dari seluruh konfigurasi yang diuji, variasi 4 teridentifikasi sebagai model paling optimal karena menghasilkan tegangan tali tambat maksimum terendah sebesar 280,492 kN, yang merefleksikan efisiensi peredaman dan stabilitas yang superior pada kondisi lingkungan terberat.
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This study analyzes the dynamic response characteristics and performance of a Truss SPAR mooring system with varying heave plate dimensions under free-floating and moored conditions, subjected to 100-year random wave loading. Through a Respons Amplitude Operator (RAO) analysis in the free-floating condition, it was identified that variation 2 showed a significant resonance amplification in the heave mode (22.937 m/m) and pitch mode (14.022 deg/m), whereas variation 4 demonstrated the most controlled RAO response in both heave (2.782 m/m) and pitch (0.127 deg/m). In the moored condition, a Root Mean Square (RMS) analysis of the spectral response indicated that surge motion was relatively unaffected (RMS ranged from 3.88 x 10-2 m to 3.91 x 10-2 m), while the heave plate was effective in damping vertical and rotational motions. The lowest RMS heave value was recorded for variation 4 (4.75 x 10-5 m), while the lowest RMS pitch value was found for variation 5 (2.63 x 10-4 deg). The evaluation of maximum mooring lines tension under 100-year extreme conditions confirmed that all variations successfully met the API RP 2SK safety criteria (SF ≥ 1.67). Of all configurations tested, variation 4 was identified as the most optimal model, as it produced the lowest maximum mooring tension of 280,492 kN, which reflects its superior damping efficiency and stability under the most severe environmental conditions.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Truss SPAR, Heave Plate, Respon Gerak, Sistem Tambat, Kondisi Ekstrem, Truss SPAR, Heave Plate, Motion Response, Mooring System, Extreme Condition.
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions:	Faculty of Marine Technology (MARTECH) > Offshore Engineering > 54040-(S1) Undergraduate Thesis
Depositing User:	Deni Ponco Aditia
Date Deposited:	27 Jul 2025 08:25
Last Modified:	27 Jul 2025 08:25
URI:	http://repository.its.ac.id/id/eprint/122069

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