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All Journal International Journal of Marine Engineering Innovation and Research
Alfiy Alfatarizqi
Department of Marine Engineering, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia.
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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Analysis of the Influence of Structural Profile Differences Between Tambak Lorok Traditional Fishing Vessels and BKI Standard Criteria Hartono Yudo; Wilma Amiruddin; Alfiy Alfatarizqi
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 4 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i4

Abstract

Traditional fishing vessels in Tambak Lorok are commonly constructed based on inherited craftsmanship and empirical experience, without adherence to any formal classification standard. Consequently, variations in the mechanical strength of wooden materials due to dimensional differences require further investigation. This study aims to examine the differences in destructive stress values that occur after the vessel experiences an impact, with reference to the Bureau of Classification Indonesia (BKI) criteria. The methodology involves recalculating the structural dimensions of wooden ship components following BKI standards and conducting localised impact tests at a standard berthing velocity of 0.25 m/s, with vessel speeds ranging from 1 knot to 2.5 knots. The analytical and experimental findings reveal a construction weight reduction of 258 kg, equivalent to approximately 42% lighter than the conventional design. The safe stress limits were determined to be 102.88 MPa on the frame and around 30 MPa on the hull plating under a 2-knot collision. These results demonstrate that applying BKI criteria enhances both structural efficiency and economic value while maintaining safety under standard berthing conditions.
ANALISIS PENGARUH CYCLONE INTAKE MANIFOLD TERHADAP PROSES PEMBAKARAN PADA MESIN DIESEL DENGAN METODE CFD Fathur Rahman; Semin; Alfiy Alfatarizqi
International Journal of Marine Engineering Innovation and Research Vol. 11 No. 3 (2026)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v11i3

Abstract

Improving the air-fuel mixing process remains a practical route for increasing the combustion quality of naturally aspirated marine diesel engines. This study evaluates a passive cyclone installed in the intake manifold of a single-cylinder Yanmar TF-85 MH engine using three-dimensional computational fluid dynamics and experimental validation. Twenty-seven cyclone geometries were generated from combinations of vane height, vane length, and twist angle, and simulations were performed at 1,600, 1,800, and 2,000 rpm. The numerical model employed an RNG k-epsilon turbulence formulation, moving-valve and piston domains, a chemical-kinetics combustion solver, and a B40 surrogate composed of methyl decanoate and n-dodecane. The optimum geometry, designated GD 11560, increased turbulent kinetic energy from 330.35 to 367.34 m2/s2, or 11.20%, while reducing the inducted air mass by 4.12%. The indicated mean effective pressure increased by 1.88% at 1,600 rpm and 0.36% at 1,800 rpm, but decreased by 0.87% at 2,000 rpm. Maximum combustion temperature and pressure rose by 2.43% and 1.08%, respectively, at 1,600 rpm. Validation errors remained below 5%. The cyclone therefore improves low-to-medium-speed combustion through stronger axial-tangential motion, although its flow restriction becomes important at high speed.
Effect of Cyclone on Marine Diesel Engine Performance Mochammad Arif Hidayatullah; Semin; Alfiy Alfatarizqi
International Journal of Marine Engineering Innovation and Research Vol. 11 No. 3 (2026)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v11i3

Abstract

Small direct-injection (DI) diesel engines remain indispensable for stationary power generation and small marine applications, where improving their output and fuel economy carries real practical value. This study evaluates the effect of modifying an intake manifold using a passive cyclone-type swirl generator on the performance of a marine diesel engine. The research presents a combined numerical and experimental approach to analyze the impact of the cyclone on engine power, torque, brake specific fuel consumption (BSFC), and thermal efficiency. Numerical simulations using Ansys Forte were initially conducted on 27 cyclone geometries to identify optimal turbulent kinetic energy (TKE) generation. Subsequently, experimental testing was performed on a Yanmar TF-85 single-cylinder diesel engine across varying speeds (1400–2200 RPM) and loads (1–3 kW). The numerical results indicated that the 110560-cyclone model generated the highest TKE (+11.20%) despite a slight reduction in mass flow. Experimental findings revealed that the cyclone significantly enhanced power and torque at low-to-medium speeds (1400–1800 RPM). Notably, at 1800 RPM, the optimal cyclone reduced BSFC by up to 20.8% and increased thermal efficiency by 26.3% compared to the standard intake. The enhanced TKE improved air-fuel homogenization, which successfully compensated for the slight volumetric efficiency drop at high speeds, providing practical evidence for intake-side swirl enhancement as an affordable route to improved marine engine performance
Co-Authors Fathur Rahman Hartono Yudo Mochammad Arif Hidayatullah Semin Wilma Amiruddin