Analisa Performa Propulsi Kapal Anchor Handling Design VS 491 CD pada saat Towing Barge Akibat Pemasangan Rudder Bulb

Harifuddin, Harifuddin (2023) Analisa Performa Propulsi Kapal Anchor Handling Design VS 491 CD pada saat Towing Barge Akibat Pemasangan Rudder Bulb. Masters thesis, Institute Teknologi Sepuluh November.

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Abstract

Kapal anchor handling adalah salah kapal yang didesign untuk mendukung operasi kegiatan offshore berupa penanganan jangkar bangunan laut dan melakukan kegiatan pemindahan objek objek seperti FPSO, Rig Semi-Submersible, construction, production, dan barge dari satu tempat ke tempat operasi yang lain sehingga membutuhkan kekuatan bollard pull yang berbeda beda tergantung besaran dari objek tersebut , disamping itu juga untuk mendukung kegiatan kegiatan lainnya seperti explorasi, dan drilling. Kapal anchor handling tug supply (AHTS) tipe design VS 491 yang telah dibangun oleh salah satu galangan di Batam mempunyai maksimum bollard pull test sebesar 255 ton. Pada tulisan ini akan menganalisa daya thrust, power, dan effisiensi propeller sebelum dan sesudah pemasangan Rudder Bulb (RB) pada saat melakukan towing barge pada kondisi barge 50% dan full loaded kapasitas, dan sarat serta kecepatan (Speed) tertentu pada kapal Anchor Handling. Resisten dari objek yang ditarik (towing) akan dipertihungan pada beban dan kecepatan masing masing. Dengan bantuan maxsuft, software rhinoceros 3D, dan Numeca CFD dihasilkan bentuk lambung kapal yang sesuai dengan aslinya. Lalu dilakukan validasi dengan dibandingkan antara tahanan pada perhitungan dengan maxsuft/holtrop dan tahanan pada perhitungan dengan CFD dengan perbedaan kurang 5% sehingga dapat dikatakan bahwa bentuk pemodelan sudah sesuai dengan bentuk asli kapal. Berdasarkan hasil perhitungan pada kondisi free running kapal Anchor Handling diperoleh Propulsive Coefficient (Pc) tanpa ESD Rudder-Bulb (RB) pada kecepatan 10, 12, dan 16.36 knot masing masing sebesar 0.5162, 0.5407, dan 0.5769 sedangkan dengan ESD-RB masing masing sebesar 0.5008, 0.5417, dan 0.5921. Perbandingan Propulsive Coefficient tanpa ESD-RB dan dengan ESD-RB, bahwa pada kecepatan 12, dan 16.36 knot mengalami peningkatan Propulsive Coefficient (Pc) masing masing sebesar 0.19%, dan 2.58% , namun Propulsive Coefficient (Pc) turun 3.08% pada kecepatan 10 knot. Berdasarkan Analisa yang telah dilakukan memberikan indikasi bahwa pemasangan Rudder Bulb (RB) akan memberikan kenaikan Propulsive Coefficient (Pc) pada kecepatan 10 knot keatas pada kondisi free running, sedangkan pada saat towing hampir tidak memberikan kenaikan Propulsive Coefficient (Pc).
Kata kunci : AHTS, FPSO, Thrust, Resistance, Speed, Bollarpull, Rudderbulb, Barge, Maxsuft, and CFD"="An anchor handling ship is a ship designed to support offshore operations in the form of handling offshore building anchors and carrying out activities of moving objects such as FPSO, Semi-Submersible Rigs, construction, production, and barges from one place to another where it requires bollard strength. pull which varies depending on the size of the object, besides that it is also to support other activities such as exploration and drilling. The VS 491 design type anchor handling tug supply (AHTS) vessel which has been built by a shipyard in Batam has a maximum bollard pull test of 255 tons. This paper will analyze the propeller thrust, power, and efficiency propeller before and after the installation of the Rudder Bulb (RB) respectively in free running conditions and towing barge conditions in 50% barge conditions and full loaded capacity, as well as in draft, and Speed on certain Anchor Handling ships. The resistance of the object being towed (towing) will be calculated on the load and speed of each. By using maxsuft, software rhinoceros 3D, dan the Numeca CFD, the shape of the ship's hull is produced according to the original. Then validation is carried out by comparing the resistance in the calculation by maxsuft/holtrop and the resistance in the calculation by CFD where resulting the difference of less than 5% so that it can be said that the form of the model is in accordance with the original shape of the ship. Based on the calculation results in the free running conditions of the Anchor Handling ship, the Propulsive Coefficient (Pc) without ESD Rudder-Bulb (RB) at speeds of 10, 12, and 16.36 knots is 0.5162, 0.5407, and 0.5769 respectively, while with ESD-RB each is 0.5008, 0.5417, and 0.5921. Comparison of the Propulsive Coefficient without ESD-RB and with ESD-RB, that at speeds of 12 and 16.36 knots, the Propulsive Coefficient (Pc) increased by 0.19% and 2.58%, respectively, but the Propulsive Coefficient (Pc) decreased by 3.08% at 10 knots. Based on the analysis that has been carried out, it indicates that the installation of the Rudder Bulb (RB) will give an increase in the Propulsive Coefficient (Pc) at speeds of 10 knots and above in free running conditions, whereas when towing it hardly gives an increase in the Propulsive Coefficient (Pc).
Keywords : AHTS, FPSO, Thrust, Resistance, Speed, Bollarpull, Rudderbulb, Barge, Maxsurft, and CFD

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	AHTS, FPSO, Thrust, Resistance, Speed, Bollarpull, Rudderbulb, Barge, Maxsuft, and CFD AHTS, FPSO, Thrust, Resistance, Speed, Bollarpull, Rudderbulb, Barge, Maxsurft, and CFD
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM751 Resistance and propulsion of ships V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM753 Propellers
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36101-(S2) Master Theses
Depositing User:	HARIFUDDIN HARIFUDDIN
Date Deposited:	04 Aug 2023 08:19
Last Modified:	04 Aug 2023 08:19
URI:	http://repository.its.ac.id/id/eprint/103837

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