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All Journal Jurnal Teknik ITS International Journal of Marine Engineering Innovation and Research

Amiadji Amiadji

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Author-ID : 225964

Automotive Engineering Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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Articles

Fluid Distribution Analysis of Kite Sail for Application on Ship Amiadji, Amiadji; Arief, Irfan Syarif; Fadhlurrahman, Zaki Rizqi
International Journal of Marine Engineering Innovation and Research Vol 1, No 4 (2017)
Publisher : Institut Teknologi Sepuluh Nopember

The increasing number of operating ships resulted in high air pollution from the combustion of the ship's engine. Efforts to utilize alternative energy to reduce ship engine work have been done, one of them is using unlimited alternative energy that is wind where one of its application of is the application of new ships sail, kite sail as auxiliary system of ship propulsion . In this final project purposed to find out the value of aerodynamic force of kite sail and power it can generated , with a CFD method that uses 3 kite sail design forms, rectangular, triangular, and elliptical, with an area of 160 m2 this models are simulated at wind speed variations from 13.4 m / s up 15.82 m / s and angel of attack variation of 15.20, and 25. From the variation obtained the total aerodynamic force generated can reach 28.73 kN in rectangular shape, 30.79 kN of Elipsical shape, and 27.55 kN of triangular shape, on variant Angel Of attack 25. From the value of the aerodynamic force, each kite sail capable of generating power, on a rectangular kite sail of up to 263.02 kW, an elipsical 276.75 kW, and a triangular 252.63 kW.

Impact Analysis of Trim Tab Inclination Angles Variation to Propulsion Power Requirement of 6 Meterâ€™s Speed Boat Amiadji, Amiadji; Baidowi, Achmad; Nanda Oktova, Aufal
International Journal of Marine Engineering Innovation and Research Vol 6, No 3 (2021)
Publisher : Institut Teknologi Sepuluh Nopember

Determining the ship's propulsion power requirements is one of the most crucial things in ship design which is related to the ship's resistance. One of the causes of the high value of a ship's resistance is excessive trim of the ship. Therefore it needs a mechanism to overcome this, it can be by applying trim tabs. The trim tab is a small surface mounted on the ship's transom that can be adjusted according to the conditions of the ship. By adjusting the angle of the trim tab to be larger, it can increase the lift force and torque moment at the stern of the ship which can reduce the trim of the ship. Based on the boatâ€™s characteristics, referring to the guide from Bennet Marine, the appropriate trim tabâ€™s geometry for this boat is a trim tab with a span width of 18â€ (46 cm) and a chord length of 9â€ (23 cm). After selecting the trim tab geometry, then analyzing the resistance and trim of the ship using the CFD method. Through CFD simulation, trim tab with an angle of 15â° can reduce the value of the ship's resistance to 17.25% and for the trim can be reduced to 46.72%. Then after the ship's propulsion power requirements calculation, it is shown that the trim tab with an angle of 15â°, a reduction of 11.56% is obtained from 78.854 kW to 69.741 kW.

Analisa Gerakan Ponton Model Tripod untuk Energi Gelombang Sistem Bandulan Yasin Besari Mustofa; Irfan Syarif Arief; Amiadji Amiadji
Jurnal Teknik ITS Vol 1, No 1 (2012)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Abstrak—Pembangkit Listrik Tenaga Gelombang Laut – Sistem Bandulan (PLTGL-SB) adalah salah satu pembangkit listrik yang memanfaatkan gelombang laut sebagai sumber energinya. Ponton berfungsi untuk mengangkut bandul yang terhubung dengan dinamo. Setiap gerakan air laut akan menggoyangkan bandul untuk memutar dinamo sehingga menghasilkan energi listrik. Perbedaan model ponton berpengaruh terhadap gerakan yang akan dihasilkan. Penelitian sebelumnya telah dilakukan dan masih dikembangkan pada model ponton segidelapan. Apabila penelitian ini berhasil, maka diperlukan lebih dari satu ponton yang akan dioperasikan. Sehingga diperlukan penelitian lebih lanjut untuk mendapatkan efisiensi dari jumlah pemasangan ponton. Penelitian ini dilakukan pada ponton model tripod, yaitu tiga buah ponton segidelapan yang dihubungkan dengan membentuk pola segitiga sama sisi. Penelitian ini bertujuan untuk mengetahui gerakan terbaik pada ponton model tripod. Pada tinggi gelombang 0.5 – 1.5 meter, gerakan terbaik didapat pada tinggi gelombang 1.5 meter. Pada periode gelombang 4 – 12 detik, gerakan terbaik didapat pada periode gelombang 4 detik. Ponton model tripod sesuai untuk diaplikasikan pada Pembangkit Listrik Tenaga Gelombang Laut – Sistem Bandulan (PLTGL-SB) jika dibandingkan dengan ponton segidelapan.

Analisa Laju Korosi Pada Pelat Baja Karbon Dengan Variasi Ketebalan Coating Yudha Kurniawan Afandi; Irfan Syarif Arief; Amiadji Amiadji
Jurnal Teknik ITS Vol 4, No 1 (2015)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Baja karbon rendah adalah baja yang paling banyak digunakan sebagai bahan pembuatan kapal. Sebagai moda transportasi yang beroperasi pada lingkungan laut yang korosif, maka diperlukan suatu perlindungan coating agar korosi yang terjadi bisa diperkecil. Pada pengujian ini, coating sengaja divariasikan ketebalannya. Hal ini mengacu pada tidak meratanya proses coating pada pelat lambung kapal, dikarenakan pengerjaan coating dilakukan secara manual dengan area yang dicat cukup luas. Sehingga kemungkinan terlalu tebal ketebalan coating bisa saja terjadi di area tertentu. Sistem coating yang diuji ada dua, yaitu sistem coating dua lapis dengan menggunakan cat Alkyd dan sistem tiga lapis dengan menggunakan cat Epoxy. Pengujian dan perhitungan laju korosinya dengan menggunakan metode elektrokimia. Dari hasil perhitungan dapat disimpulkan bahwa semakin tebal lapisan suatu coating tidak menjamin coating tersebut dapat melindungi dengan sempurna. Semakin tebal suatu coating memiliki resiko kegagalan coating lebih besar seperti, berkurangnya fleksibilitas, terjadinya pengerutan, atau pengeringan yang tidak sempurna.

Development of Marine Loading and Unloading System for Ro-Ro Vessel Amiadji Amiadji; Sunarsih Sunarsih; Arie Nanda Rizaldi
International Journal of Marine Engineering Innovation and Research Vol 4, No 3 (2019)
Publisher : Institut Teknologi Sepuluh Nopember

Ship stability is one of the important criteria for ship safety as required by IMO and Indonesia Classification Bureau (BKI) in various rules. One of it is the IMO code of Intact Stability. Many factors affect the stability of a ship, including ship load, which in application varies in weight and type of vehicle. Maxsurf has been used to analyze various conditions of the ship, including stability. However, Maxsurf is too complicated to be used by ordinary people. For that a package needed as mediator to Maxsurf to be easier to use. This research developed a package to assist in analyzing the ship stability with vary in weight and type of vehicle. The package was created in Microsoft Excel worksheet and is connected to Maxsurf Stability. Visual Basic for Application was use to write the codes (coding) for the package command. The target ship used in this analysis is a 500 GT ferry ship. After the package is working properly, the analysis simulation can be run. Simulation results show that maximum GZ of both fully loaded and overloaded conditions occur at tilt angle of around 30o. Exceeding such value, the ship for both conditions slowly lose the turning moment. At fully loaded condition, the ship hardly turns back after reaching a tilt angle of 73 o. At overload condition, the ship is still safe though losing its ability to turn back is faster, at heel angle of 71o.

Flat Top Barge 300 feet Using Portable Dynamic Positioning System Agoes Santoso; Juniarko Prananda; Amiadji Amiadji; Edi Jadmiko; Izzu Alfaris Murtadha
International Journal of Marine Engineering Innovation and Research Vol 1, No 2 (2017)
Publisher : Institut Teknologi Sepuluh Nopember

Portable Dynamic Positioning System has not commonly applied to the ship, especially on barge. Besides for Dynamic Positioning function, the system can be used as ship's main propulsion. By using this system, the ship able to not using anchors because the functions can be performed by the Portable Dynamic System. Therefore, research about the application of Portable Dynamic Positioning System on the ship is conducted. This research aims to design a Flat Top Barge 300feet ship, to determine the specifications of Portable Dynamic Positioning System which is used, and to find out the ship stability which is designed on the empty payload condition and maximum payload. This research designed the ships with main dimensions LWL 90.1 meters, 25 meters wide, 5.5 meters high and 4.2 meters draught. To generate the ship with a maximum speed of 8 knots, it takes four thruster supplied with power 225 kW each, so that the total generated power is 1100 kW. This study analyzes three conditions of the ship stability, there are the condition of full payload, empty payload, and maximum payload. Each payload conditions will be analyzed regarding the large payload and draught water produced. The first is full payload conditions resulting payload in the amount of 5650 ton with a draught on the LCF at 4,181 meters. The second is the large empty payload condition displacement is 2809 ton and water draught on the LCF at 1,591. And the last is maximum payload conditions, resulting payload in the amount of 7450 ton with a draught on the LCF at 4,994 meters.

The Effect of Boss Cap Fins to B – Series Propeller Performance With CFD Method Amiadji Amiadji; Achmad Baidowi; Achdri Fauzi Nugraha Oloan
International Journal of Marine Engineering Innovation and Research Vol 2, No 4 (2018)
Publisher : Institut Teknologi Sepuluh Nopember

Propeller is similar to rotating fan blade with having primary function as propulsion system. In order to increase propeller performance, Engineer is developing Energy Saving Devices ( ESD ) to reduces operational cost, clean energy and for long term utilization. The global emmision from marine is 2.7 % in 2007. One of ESD is Propeller Boss Cap Fins ( PBCF ). The focus of this thesis is to design and developed PBCF B - series propeller. This thesis studies the performance of a propeller without and with PBCF such as efficiency, thrust, torsion and dynamic hub vortex phenomenon. To obtain the results this thesis uses Computational Fluid Dynamic (CFD). The PBCF simulations were based on its pitch angle. The simulation results shows that PBCF is achieved the highest efficiency which is 0.60 %, and increases thrust 3.21 %, and torsion increase 2.64 % compared to propeller without PBCF. It also shows that the PBCF is able to break the vortex flow and it will reduces the porosity to the rudder and decrese the corrosion potention to the rudder.

Co-Authors Achdri Fauzi Nugraha Oloan Achmad Baidowi Achmad Baidowi, Achmad Agoes Santoso Arie Nanda Rizaldi Aufal Nanda Oktova Edi Jadmiko Fadhlurrahman, Zaki Rizqi Irfan Syarif Arief Irfan Syarif Arief Izzu Alfaris Murtadha Juniarko Prananda Nanda Oktova, Aufal Rizaldi, Arie Nanda Sunarsih Sunarsih Sunarsih Sunarsih Yasin Besari Mustofa Yudha Kurniawan Afandi

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