Negoro, Gilrandi Adi (2019) Studi Eksperimen Pengaruh Gelombang Terhadap Respons SPAR Dengan dan Tanpa Heave Plate Pada Kondisi Sistem Tambat Intact dan Damaged. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penelitian tugas akhir ini, membahas mengenai pengaruh penggunaan heave plate terhadap respons dinamis SPAR akibat gelombang acak. Studi dilakukan menggunakan dua metode, yaitu metode eksperimen dan metode numeris. Metode eksperimen dilakukan di Kolam Manuevering Ocean Engineering Basin, Balai Teknologi Hidrodinamika (BTH) � BPPT. Model SPAR yang dibuat mengikuti prototype Classic SPAR dengan skala 1:125, yang menggunakan sistem tambat tipe taut dengan empat tali tambat identik. Studi eksperimen dan numeris dilakukan menggunakan metode time domain, dengan variasi penambahan heave plate pada bagian keel SPAR. Rasio heave plate yang digunakan adalah 1.5 kali diameter luar SPAR. Tiap analisis dilakukan saat sistem tambat dalam keadaan intact dan damaged. Respons dinamis SPAR yang diteliti yaitu: surge, heave, pitch, dan offset maksimum. Hasil analisis eksperimen dan numeris lalu dibandingkan kesesuaiannya. Hasil akhir dari penelitian tugas akhir ini menunjukkan bahwa penggunaan heave plate tidak terlalu mempengaruhi respon gerak surge, dan pitch. Sedangkan pada respon gerak heave, penggunaan heave plate menunjukkan reduksi yang konsisten dan signifikan pada setiap kondisi, baik pada metode numeris dan eksperimen. Reduksi respon heave terbesar terjadi pada kondisi SPAR dalam keadaan sistem tambat damaged, yaitu sebesar 33.29% pada metode eksperimen, dan sebesar 27.84% pada metode numeris. Hasil penelitian juga menunjukkan bahwa penggunaan heave plate dapat mereduksi offset maksimum SPAR hingga 31.69% pada metode eksperimen, dan 11.22% pada metode numeris.
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This undergraduate thesis discusses the effects of heave plate utilization against dynamic responses of SPAR due to random waves. The analysis has been done by numerical and experimental methods. The experimental method was held in Maneuvering Ocean Engineering Basin of Balai Teknologi Hidrodinamia (BTH), BPPT. The model scale of SPAR was constructed based on the classic SPAR prototype with taut mooring systems using four identical moorings in a 1:125 scale factor. Both experimental and numerical studies were conducted in time domain analysis with heave plate utilization in the keel of SPAR as the main variable. The diameter of the heave plate has a 1.5 ratio to the outer diameter of SPAR. Each analysis was conducted in intact and damaged mooring systems. The analyzed variables of dynamic responses are the surge, heave, pitch, and maximum offset of the SPAR. Results of both the experimental and numerical studies were then compared, showing that the heave plate does not affect surge and pitch responses significantly. On the other hand, it impactfully and consistently reduces the SPAR heave responses in every condition of analysis in both the numerical and experimental methods. The most significant reduction of SPAR heave response occurred when the mooring systems were in damaged condition, i.e., 33.29% and 27.84% heave reduction in the experimental and numerical method, respectively. The study also shows that the heave plate reduces SPAR maximum offset up to 31.69% in experimental analysis and 11.22% in numerical analysis.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | SPAR, heave plate, irregular waves, offset, Dynamic responses |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM163 Hulls (Naval architecture) 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: | Negoro Gilrandi Adi |
| Date Deposited: | 26 Jun 2024 07:18 |
| Last Modified: | 26 Jun 2024 07:18 |
| URI: | http://repository.its.ac.id/id/eprint/68665 |
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