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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Jurnal Teknik ITS Program Kreativitas Mahasiswa - Karsa Cipta International Journal of Marine Engineering Innovation and Research

Frengki Mohamad Felayati

Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Author-ID : 3418956

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

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RANCANG BANGUN PROTOTIP VORTECH (VORTEX TECHNOLOGY) SEBAGAI PEMBANGKIT LISTRIK TENAGA VORTEKS UNTUK KEMANDIRIAN PENERANGAN JEMBATAN SURAMADU Ghofur, Abdul; Felayati, Frengki Muhamad; Junianto, Sony; Wiradhika, Rizky Akbar; Wiranata, Addien Wahyu; S, Sutarsis
Program Kreativitas Mahasiswa - Karsa Cipta PKM-KC 2013
Publisher : Ditlitabmas, Ditjen DIKTI, Kemdikbud RI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (233.522 KB)

Energy problem is one issue that is important for all developing countries and has been advancing from day to day. As the longest bridge connecting Java and Madura islands, Suramadu Bridge is facing high operational costs, for example it uses fossil fuels as a fuel generator. Given the potential of nature that exist around Suramadu, this study offered a solution to create independence in Suramadu lighting with a vortex energy based tools. The purpose of the program design is to create a Vortech Vortech as a prototype power plant in the vortex for illumination independence Suramadu Bridge.

Pemodelan Sistem Hidrolis Terhadap Variasi Tinggi Gelombang Air Laut Pada Sistem Wave Energy Hyperbaric Converter (WEHC) Frengki Mohamad Felayati; Taufik Fajar Nugroho; Sutopo Purwono
Jurnal Teknik ITS Vol 4, No 2 (2015)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Perbedaan karakteristik gelombang berpengaruh terhadap listrik yang dihasilkan pembangkit listrik tenaga gelombang laut. Termasuk WEHC (Wave Energy Hyperbaric Converter) dalam instalasinya perlu dianalisa aliran energi terhadap variasi tinggi gelombang air laut dan mengetahui tinggi gelombang optimum untuk instalasinya. Sistem ini bekerja dengan sub sistem antara lain buoy, arm, hydraulic pump, hyperbaric accumulator, hyperbaric chamber, dan turbin pelton. Sistem bekerja secara tertutup dengan menggunakan fluida fresh water. Implementasi dari converter ini yaitu di daerah pantai curam atau dengan rekayasa struktur yang sesuai. Pembuatan simulasi menggunakan MATLAB Simulink dengan memvariasikan tinggi gelombang laut antara 1 – 2 m dan periode gelombang 5 – 7 m. Rancangan sistem ini menghasilkan daya terkecil 8.8 kW yaitu pada periode gelombang 7 s dan tinggi gelombang 1 m. Sedangkan daya terbesar yaitu 24.9 kW pada periode gelombang 5 s dan tinggi gelombang 2 m dengan efisiensi sebesar 82.8%.

Study of The Technical Approach on Recent Fuel Efficiency to Reduce Ship Emissions Mohammad Danil Arifin; Frengki Mohamad Felayati; Fanny Octaviani
International Journal of Marine Engineering Innovation and Research Vol 7, No 1 (2022)
Publisher : Institut Teknologi Sepuluh Nopember

Engine emissions of ships have been highly concerned in the last decades. Most of the current ship operations worldwide are powered by the combustion engine. Advance ship powering is still on research and hard to implement directly. High cost in the application is the main issue. Meanwhile, the fuel engineering approach is proposed in the recent research to advance engine combustion, thus increasing the combustion efficiency and lowering the emissions target. This study aims to evaluate the development trend on the fuel efficiency technique to lower ship emissions. Emissions management, fuel conversion, and power conversion are the most research focus to improve fuel efficiency. However, implementing some of that research is still hard on ship operation. Technical and economic issues are the main reason. Moreover, fuel efficiency on ships is still highly based on management. Low cost, new combined fuel without separation, and less fuel treatment technology are proposed to avoid confusion on fuel consumption in the near future.

Experimental Analysis of Gas Split Injection Effect on Dual-Fuel Engine Performance Semin Semin; Beny Cahyono; Yudha Prasetiyo; Frengki Muhammad Felayati
International Journal of Marine Engineering Innovation and Research Vol 6, No 2 (2021)
Publisher : Institut Teknologi Sepuluh Nopember

The application of a dual-fuel engine has massively been used as the main engine. However, in dual-fuel engine operations, problems occur in low-load operations. The combustion quality with unstable combustion conditions and relatively low thermal efficiency. In this research, a gas split injection strategy was implemented on the dual-fuel engine. The purpose of this research is to compare the performance of the engine between dual-fuel operations using gas split injection strategy and single injection. Furthermore, split injection is a fuel injection system by dividing the injection into several injection stages with a certain mass and period. This injection system was applied on a dual-fuel engine system, which was previously a modification of the conventional diesel Yanmar TF 85 MH. The variation in this study is the injection split ratio (ISR) 75-25, variations in injection time, and variations in load with specified engine speed at 2000 RPM. The results obtained in this study are the best variations found in ISR 75-25 gas split injection with injection distance at 260°bTDC & 244°bTDC. Due to the injection distance, a significant difference occurred in all parameters tested between single injection and split injection. The significance of the difference in power, torque, BMEP, SFOC, and the thermal efficiency only occurs at 100% load, which is 4.3%; 4.2%; 4.2%; 16%; 18.3%.

Numerical Study of B-Screw Ship Propeller Performance: Effect of Tubercle Leading Edge Mohammad Danil Arifin; Frengki Mohamad Felayati
International Journal of Marine Engineering Innovation and Research Vol 6, No 1 (2021)
Publisher : Institut Teknologi Sepuluh Nopember

Various attempts to modify the ship's propeller have been made to improve performance as a propulsion component. This paper analyzes the effect of modification of the B-Series propeller by adopting a whale fin shape (Humpback Whale). Also, it analyzes the flow in the propeller before (standard) and after modification. Modifications are made to the leading edge, which is called the tubercle leading edge (TLE). It adds and subtracts sections with a wavelength of 0.2R and amplitude of 2.5% of the chord section length in the propeller leading edge. The numerical study is used using CFD on different J values (0.2, 0.4, and 0.6). It was found that the modification of TLE has a less significant effect on performance. Instead, it decreased at a low J value (0.2). Meanwhile, the largest decrease was at a high J value (0.6), namely up to 10.4% for thrust, 4.3% for torque, and 6.4% for efficiency. Whereas at J=0.4, the torque increases only 0.4%, and the torque and thrust decrease, although less significant. The flow analysis indicates that the shape of the TLE provides a decrease in pressure. However, on the positive side, this modification provides a reduction in noise on the propeller surface.

Cavitation Analysis of Kaplan-Series Propeller: Effect of Pitch Ratio and nProp using CFD Mohammad Danil Arifin; Frengki Mohamad Felayati
International Journal of Marine Engineering Innovation and Research Vol 6, No 2 (2021)
Publisher : Institut Teknologi Sepuluh Nopember

Cavitation is defined as a phenomenon or action of the traveling bubbles that pass through the hydrofoil in which the reduction of pressure below the liquid’s vapor pressure leads to the formation of small vapor bubbles (or cavities) caused by the dynamic pressure of the propeller blades. It caused some effects on the propeller of the ship i.e. it can greatly reduce a ship’s propelling efficiency, damaged propeller material or blade erosion, vibration, and disturbance noises. Cavitation can be minimized by proper attention regarding the design of the propellers and variation of propeller variables parameters. For that reason, this research conducts a cavitation analysis on the Kaplan-Series of the CPP by varying P/Db=0.4, P/Db=0.6, and P/Db=0.8; also the rotational speed of the propeller (nProp) i.e. 125 rpm, 175 rpm and, 225 rpm. The numerical analysis was made based on the Computational Fluid Dynamic Method (CFD) to calculate the pressure ratio (ΔP) and percentages of the cavitation area (Rs) due to a configuration of the propellers parameter. The simulation consists of the 3 steps; pre-processor, solver manager, and post-processor. The result shows that the value of the pressure ratio increased significantly at the higher P/Db and nProp. Also, the variation of P/Db and nProp has a significant effect on the development of Rs (%) at the higher P/Db and nProp.

Development of Hybrid CNG/Diesel Dual-Fuel Engine in High Load Condition for Marine Debris Vessel Frengki Mohamad Felayati; Erik Sugianto; Nilam Sari Octaviani
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 1 (2023): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i1.51069

Greenhouse gas (GHG) emissions are the most influential issue in the transportation sector in recent years due to their impact on the environment. Thus, the design of transportation power plants is necessary to ensure the lowest GHG emissions. However, the development of a small vessel power plant is discussed in this study. The small vessel is a marine debris working vessel that has the purpose of collecting marine debris on the water surface with a conveyor. This vessel is designed with a dual-fuel engine fueled by natural gas from CNG and diesel fuel in high load conditions. Furthermore, the power system is designed with a systematical assessment condition based on the operational condition. Moreover, an experiment was conducted to study the performance and emissions of the engine. The hybrid system is designed with several operational conditions, such as sailing, collecting, and maneuvering. Most of the operations can be used in the hybrid dual-fuel system with nearly similar engine torque to diesel mode. The dual-fuel hybrid system has a significantly low engine fuel consumption with low CO2 emissions. However, relatively high NO2 and CO emissions are still considerable.

Numerical Study of Kaplan Propeller by Using CFD: Effect of Angle and Blade Diameter Variations Mohammad Danil Arifin; Frengki Mohamad Felayati; Muswar Muslim; Ayom Buwono; Yeddid Yonatan Eka Darma
International Journal of Marine Engineering Innovation and Research Vol 8, No 2 (2023)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i2.16888

Efficient propeller performance contributes to better overall ship performance and speed. A well-designed propeller can optimize thrust generation, leading to improved maneuverability, responsiveness, and acceleration. It enables ships to maintain higher speeds while using less power, enhancing their competitiveness in the maritime industry. In this study, the Kaplan series propeller was analyzed by using Computational Fluid Dynamics (CFD). By modifying the angle of attack on the Kaplan propeller with 3, 4, and 5 blades, the distribution of the surface pressure, generated thrust, and torque value were easily identified and analyzed. The result shows that the change in the angle of attack influenced the pressure distribution on the back and face side of the propeller. The angle of attack is increased, and the pressure surface distribution also tends to increase. It has also affected the efficiency of the propeller performance which is expressed by the values of thrust propeller and torque. The more efficient the propeller performance, the less power it requires to produce the desired thrust.

Co-Authors Abdul Ghofur Addien Wahyu Wiranata Ayom Buwono Cahyono, Beny Cahyono, Beny Fanny Octaviani Mohammad Danil Arifin Muswar Muslim Nilam Sari Octaviani Prasetiyo, Yudha Rizky Akbar Wiradhika Semin Semin Sony Junianto Sugianto, Erik Sutarsis Sutarsis Sutopo Purwono Taufik Fajar Nugroho Yeddid Yonatan Eka Darma Yudha Prasetiyo

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