Gumelar, Grandhis (2018) Studi Numerik dan Eksperimen Olah Gerak dan Dinamika Tegangan Sistem Tambat Taut SPAR Helical Strakes Dengan Variasi Ketinggian Fairlead. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Single Point Anchor Reservoir (SPAR) merupakan anjungan lepas pantai terapung dengan kemampuan pengeboran perisapan produksi, dan produksi dengan cakupan kedalaman yang luas. SPAR memiliki keunggulan dalam stabilitas karena memiliki titik gravitasi yang beradai dibawah titik buoyancy. Helical Strakes digunakan pada SPAR untuk mengurangi efek Vortex-Induced Vibration (VIV) akibat arus disekeliling struktur. Efek dari Helical Strakes terhadap olah gerak dan dinamika tegangan pada sistem tambat taut SPAR akan dianalisa secara numerik dan eksperimen. Gerakan yang ditinjau dalam tugas akhir ini adalah surge, heave dan pitch. Selain itu pada kondisi tertambat akan dilakukan variasi ketinggian fairlead relative terhadap draft yaitu 0.1T diatas permukaan air, 0T pada permukaan air dan -0.1T dibawah permukaan air. Eksperimen dilakukan menggunakan model Classic SPAR dilengkapi Helical Strakes dengan skala 1:125. Sistem tambat yang digunakan adalah taut dengan 4 tali tambat. Gelombang yang digunakan dalam eksperimen ini adalah gelombang reguler. Setelah dilakukan analisa dari hasil numeris dan eksperimen maka didapatkan pada kondisi terapung bebas, Helical Strakes dapat mengurangi nilai maksimum dari mode heave sebanyak 68% dan pitch sebanyak 19%, tetapi nilai dari mode surge lebih tinggi yaitu 5%.
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Single Point Anchor Reservoir (SPAR) is a floating offshore platform with
production drilling capability, and production with wide depth coverage. SPAR has
an advantage in stability because it has a point of gravity under the buoyancy point.
Helical Strakes are used on SPAR to reduce the effects of Vortex-Induced Vibration
(VIV) due to currents around the structure. The effects of Helical Strakes on
movement and voltage dynamics on the SPAR link mooring system will be analyzed
with numerical and experimental. Movements reviewed in this final project are
surge, heave and pitch. In addition to the condition of tethered variations will be
done fairlead height relative to the draft is 0.1T above the water surface, 0T on the
water surface and -0.1T below the water surface. The experiment was conducted
using Classic SPAR model equipped with Helical Strakes with scale 1: 125. The
mooring system used is a link with four mooring ropes. The wave used in this
experiment is a regular wave. After analysis of the numerical and experimental
results obtained in free-floating conditions, Helical Strakes can reduce the
maximum value of the heave mode by 68% and the pitch by 19%, but the value of
the surge mode is higher at 5%.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSKe 627.32 Gum s-1 2018 |
| Uncontrolled Keywords: | SPAR, sistem mooring, RAO gerak and tension, ketinggian fairlead |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Gumelar Grandhis |
| Date Deposited: | 15 Feb 2021 03:03 |
| Last Modified: | 15 Feb 2021 03:03 |
| URI: | http://repository.its.ac.id/id/eprint/53710 |
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