Studi Analitis, Numerik, dan Eksperimen Olah Gerak Dan Dinamika Tegangan Sistem Tambat Taut SPAR Dengan Variasi Posisi Fairlead Relatif Terhadap Center of Gravity

Dwisatya, Salman Yanuar (2017) Studi Analitis, Numerik, dan Eksperimen Olah Gerak Dan Dinamika Tegangan Sistem Tambat Taut SPAR Dengan Variasi Posisi Fairlead Relatif Terhadap Center of Gravity. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

SPAR (Single Point Anchor Reservoir) merupakan bangunan yang dirancang berupa silinder yang besar dan panjang. Stabilitas SPAR dapat dicapai dengan filosofi pengaturan titik berat (COG) dari bangunan tersebut harus berada di bawah titik buoyancy nya (COB). Selain itu, sistem tambat juga ditambahkan pada SPAR untuk membatasi respon gerakan heave, pitch, dan surge yang terjadi akibat beban angin, arus, dan gelombang ketika beroperasi di laut lepas. Akan tetapi, dibutuhkan konfigurasi tali tambat yang optimal untuk mengakomodasi gerakan SPAR agar aktivitas yang berjalan di deck tidak terganggu. Dalam penelitian ini dilakukan studi yang ditinjau secara analitis, numerik dan eksperimen terhadap model SPAR (skala 1:125) di Laboratorium Hidrodinamika ITS pada kondisi terapung bebas dan tertambat dengan variasi posisi fairlead terhadap titik pusat massa (1.5 VCG, 1.25 VCG, dan 1 VCG) untuk mengetahui respon gerak dalam bentuk RAO dan tegangan tali dalam bentuk Tension Operator. Berdasarkan hasil penelitian, RAO gerakan model antara kondisi terapung bebas dan tertambat memiliki perubahan yang signifikan di setiap gerakan heave, pitch dan surge. Pada setiap variasi posisi fairlead, respon gerak dan tegangan tali tambat yang dihasilkan semakin menurun ketika posisi fairlead mendekati titik center of gravity. Tetapi frekuensi resonansi dari sistem berubah secara konsisten dari variasi pertama hingga terakhir. ==================================================================== SPAR (Single Point Anchor Reservoir) is a building designed in the form of large and long cylinder. SPAR stability can be achieved with controlling the center of gravity (COG) of the building must be below its center of buoyancy (COB). Moreover, the mooring system is also added to the SPAR to limit the response of heave, pitch, and surge movements that occur due to any environmental loads. However, an optimal moor rope configuration is required to accommodate SPAR motion to keep the activity running on the deck undisturbed. In this study, an analytical, numerical, and experimental study of SPAR model (scale 1:125) was performed at the Hydrodynamics Laboratory ITS. This study performed on free and moored floating conditions with variation of fairlead position to the center of gravity (1.5 VCG, 1.25 VCG and 1 VCG) to find out the motion response in the form of RAO and tension response in the form of Tension Operator. Based on the results of the research, RAO motion model between free and tethered floating conditions has significant changes in each heave, pitch, and surge motions. In each variation of the fairlead position, the result shows that motion response and mooring tension decreases as the fairlead approaches the center of gravity. But the resonance frequency of the system changes consistently to the higher frequency from the variation 1.5 VCG to 1 VCG.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: SPAR, sistem tambat, elevasi fairlead, respon gerak, tegangan tali tambat.
Subjects: V Naval Science > V Naval Science (General)
V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
Divisions: Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User: Salman Yanuar Dwisatya
Date Deposited: 19 Jan 2018 07:46
Last Modified: 08 Mar 2019 06:27
URI: https://repository.its.ac.id/id/eprint/45409

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