Kumpulan Jurnal dan Prosiding Elektronik PPNS (Politeknik Perkapalan Negeri Surabaya - Pusat Penelitian dan Pengabdian Masyarakat, P3M)
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Kajian Numerik Pengaruh Sudut Outward Inclined Sudu terhadap Kinerja Turbin Vertikal Darrieus sebagai Wave Energy Convertion (WEC)
No full textIn 2024, Indonesia implemented alternative energy regulations through President No. 5 / 2006 to reduce dependence on oil imports, with 31% of the renewable energy targets in 2050. As a maritime nation, Indonesia has significant wave energy potential.. The ongoing research focuses on ocean wave energy utilization using Darrieus\u27s vertical turbine to capture horizontal wave energy in shallow waters. Earlier, WEC models had combined Darrieus and Wells with the configuration of the turbine suu turbine to optimize horizontal and vertical energy conversions of the waves, and this research would develop further Vertical Axis Turbine (VAT) Darrieus with a variation of the corner of the turbine to increase efficiency. The method used involves computational fluid dynamics (CFD) simulations to analyze turbine performance via coeffective of power and coeffective of torque. Research is expected to increase the efficiency of ocean wave conversion in Indonesia
Pengaruh Variasi Panjang Busur Terhadap Performa Turbin Angin Savonius Persamaan myring n=1 dengan Kecepatan 6 m/s
No full textThe Savonius wind turbine is a type of vertical axis wind turbine widely used for small-scale applications due to its simple construction and ability to operate at low wind speeds. Previous studies have shown that the addition of deflectors can enhance performance, but the blades used have not been varied. Therefore, this experiment employs variations in arc length with a myring equation of n=1 without deflectors. This research aims to analyze the performance of the Savonius wind turbine with variations in both increased and decreased blade arc lengths of 4 cm and wind speeds of 5 m/s, 6 m/s, and 7 m/s in relation to the torque coefficient and power coefficient produced. The best results from this experiment were obtained with an increased arc length at a speed of 6 m/s. The optimal power coefficient value was 0.2364, with a performance improvement of 28.340%, while the torque coefficient was 0.6118, showing a performance improvement of 12.857% compared to other variations
PERANCANGAN DAN PROSES FABRIKASI HIDROGEN GENERATOR DENGAN VARIASI BENTUK DAN KERAPATAN ELEKTRODA TERHADAP HASIL PRODUKSI GAS HIDROGEN
No full textThe global energy crisis and the environmental impact of fossil fuel use are driving the search for environmentally friendly and sustainable alternative energy. Hydrogen is a potential solution because it is clean, flexible, and can be produced from water through the electrolysis process. This study aims to design and manufacture a hydrogen generator device based on water electrolysis with a catalyst KOH 0.05 M, as well as evaluate the influence of variations in the shape and density of electrodes on the efficiency and volume of hydrogen gas produced. This study used two electrode shapes (square and perforated square) and three variations of the spacing between the electrodes (4 mm, 5 mm, and 6 mm), resulting in six combinations of variations. The test was carried out on a laboratory scale using an electric current of 9.5 Amper. The results showed that the shape and density of the electrode had a significant influence on the efficiency of the electrolyser and the discharge of hydrogen gas. The highest efficiency of 37.79% was obtained on the square-shaped electrode with a spacing of 6 mm, resulting in a hydrogen discharge of 1.431 × 10?? m³/s. These findings suggest that increasing electrode spacing and optimal shape selection can improve the efficiency of hydrogen production. The novelty of this study lies in the systematic integration of electrode shape and density variations in wet cell hydrogen generators, as well as the modification of electrical input lines that avoid direct contact with electrolyte liquids, thereby reducing the risk of short circuits and improving system efficiency
ANALISIS EMISI GAS BUANG PADA FOUR STROKE DIESEL ENGINE MENGGUNAKAN MULTI-FEEDSTOCK BIODIESEL (MINYAK KELAPA SAWIT, MINYAK JELANTAH, MINYAK KEDELAI) DENGAN PENAMBAHAN ZAT ADITIF 2-EHN PADA BEBAN 4000 WATT
No full textMeningkatnya emisi gas bahan bakar fosil yang menyebabkan efek gas rumah kaca (GRK) namun emisi juga dapat mengindikasikan kondisi meisn diesel, hal ini mendorong pengembangan bahan bakar alternatif yang ramah lingkungan. Penelitian ini bertujuan untuk mengetahui karakteristik dan emisi gas yang dihasilkan bahan bakar multi-feedstock biodiesel yang terbuat dari minyak kelapa sawit, minyak jelantah dan minyak kedelai dengan campuran pertamina dex pada four stroke diesel engine. Metode yang digunakan adalah eksperimen laboratorium dengan variasi campuran B40 dan B40 dengan penambahan zat aditif 2-ethylhexyl nitrate (2-EHN) dan dengan pengujian emisi gas buang pada putaran engine 1000 RPM, 1200 RPM dan 1400 RPM dengan beban lampu 4000 Watt. Parameter yang diuji adalah titik nyala, densitas, viskositas, angka setana nilai kalor, serta emisi CO, NOx dan SO2. Hasil penelitian menunjukkan campuran bahan bakar B40 dengan penambahan zat aditif memiliki performa terbaik yang menunjukkan peningkatan karakteristik dengan angka setana (>59,2 (min)), viskositas menurun menjadi 5,78 cSt, serta emisi CO yang lebih rendah dengan kadar paling tinggi pada 84,89 mg/m³. namun emisi NOx mengalami sedikit peningkatan dengan kadar tertinggi 165,9 mg/m³ namun masih di bawah batas standar baku mutu emisi gas buang, yaitu 3400 mg/m³. kesimpulannya multi-feedstock biodiesel B40 dengan penambahan zat aditif 2-ethylhexyl nitrate (2-EHN) memiliki potensi menjadi bahan bakar alternatif yang ramah lingkungan dibandingkan dengan bahan bakar komersil
STRATEGI PENANGANAN KETERLAMBATAN PROYEK REPARASI DI GALANGAN KAPAL JAWA TIMUR
Full text linkThis shipyard in East Java is a company that provides ship repair and maintenance services, ranging fromtankers to tugboat.This research aims to identify risk factors causing delays and develop effectivemitigation strategies. The method used is Analytical Hierarchy Process (AHP) to determine the weight andpriority of delay indicators, and House of Risk (HOR) to identify the dominant risk agent and appropriatepreventive actions. AHP results show that 6 main risk factors with the highest weights are labor shortage,additional work requested by the owner, low labor productivity, delayed material delivery, weatherconditions, and lack of labor expertise. HOR phase 1 identified 14 dominant risk agent, with the highestAggregate Risk Potential (ARP) of 1518.75 related to frequent labor turnover. HOR phase 2 generated 21preventive actions, with the highest Effectiveness to Difficulty (ETD) score of 8262.75 achieved throughimplementing a shift-based work schedule. This strategy are expected to support the shipyard in minimizingproject delays and improving overall performance
PERAN PENTING PATROLI, PEMANDUAN, DAN KEPATUHAN HUKUM DALAM KESELAMATAN BERLAYAR
Full text linkMaritime safety is a crucial aspect that requires special attention, particularly in port areas with high vessel traffic. Gresik, as a strategic maritime region, experiences intense daily activities in trade and sea transportation. This study aims to analyze the influence of patrols, pilotage, and legal compliance on sailing safety in the jurisdiction of KSOP Class II Gresik. The research employs a quantitative approach with multiple linear regression analysis using SPSS. Data were collected from 63 respondents, consisting of port officers, ship captains, crew members, pilots, and agents, through purposive sampling. The results indicate that both partially and simultaneously, patrols (X1), pilotage (X2), and legal compliance (X3) have a significant effect on sailing safety (Y), with a coefficient of determination of 78.2%. The regression equation obtained is Y = 3.093 + 0.298X1 + 0.240X2 + 0.303X3. These findings confirm that enhancing patrol effectiveness, ensuring professional pilotage, and strengthening legal compliance play essential roles in improving sailing safety. Practically, this study provides valuable insights for port authorities and shipping companies in formulating effective supervision and operational policies to minimize the risk of maritime accidents
ANALISIS RISIKO KEGAGALAN ALAT GRAB DI PELABUHAN X DENGAN METODE FMEA
Full text linkPorts play an important role in logistics activities, including in the management of dry bulk terminals, where Grab equipment is one of the main tools in the loading and unloading process, including at Port X. However, Grab equipment often experiences failures during operation. This study identifies and analyzes the risk of Grab equipment failure using the Failure Mode and Effect Analysis (FMEA) method. The FMEA method can evaluate and analyze components in a system to minimize the risk of failure of those components. The FMEA results show that the 34 potential failure modes with the highest risk are partial/total wire rope breakage with an RPN value of 194.40, solenoid damage (152.32), and wire rope strands coming out (123.98), while the lowest risk is frame deformation with an RPN value of 11.60. The RPN values were then accumulated in a Pareto chart using the 80:20 principle, which produced the 20 highest values out of a total of 34 potential failure modes. Recommendations were given to minimize disruptions in the loading and unloading process
ANALISA PERFORMA FOUR STROKE DIESEL ENGINE MENGGUNAKAN BAHAN BAKAR MULTI-FEEDSTOCK BIODIESEL DENGAN MINYAK SERAI WANGI SEBAGAI ZAT ADITIF
No full textThis study analyzes the performance of a four-stroke diesel engine fueled with multi-feedstock biodiesel (palm oil,
waste cooking oil, and soybean oil) enhanced with citronella oil as a bioadditive. Three fuel blends (B35, B40, B100) were
tested with additive concentrations of 0.1%, 0.5%, and 1% under varying loads (2000 W, 3000 W, 4000 W) and engine
speeds (1000 rpm, 1200 rpm, 1400 rpm). Tests included fuel properties (flash point, viscosity, density) and engine
performance parameters (power, torque, and brake specific fuel consumption/BSFC). Results showed that adding 0.5%
citronella oil to B40 produced the highest power and torque, while the lowest fuel consumption was achieved with B35 at
0.1% additive. Higher additive concentrations did not consistently improve performance and in some cases increased BSFC.
All biodiesel blends met the Indonesian National Standard (SNI) specifications for tested parameters. Overall, multi
feedstock biodiesel with low-concentration citronella oil additive offers an efficient and environmentally friendly alternative
fuel, with optimal effectiveness at low additive level
STUDI NUMERIK PENGARUH VARIASI SUDUT DEFLEKTOR DI SAMPING ADVANCING BLADE TURBIN ANGIN SAVONIUS MYRING n=1 DENGAN PENAMBAHAN PANJANG BUSUR 4 CM PADA KECEPATAN 7 m/s
No full textSavonius wind turbine performance with myring n=1 and additional deflector next to the advancing blade has improved in the previous experimental studies. Although the performance has improved, but its flow visualization such as velocity contours, streamline velocity, and pressure contours cannot be displayed. Therefore, this study was conducted to visualize the turbine flow. The 3D Computational Fluid Dynamic (CFD) method was used to obtain the Coefficient of Torque (Ct), Coefficient of power (Cp), and describe the flow visualization. The steps began with geometry creation, meshing, model validation, and variation simulation. A 4 cm long arc and deflector angle variation placed next to the advancing blade were added to the wind turbine. The dimensions of the turbine used, both in height and diameter, were 40 cm. The variation in the deflector angles were 0°, 15°, 30°, and 45° and wind speeds were 5 m/s, 6 m/s, and 7 m/s. The best results were obtained at a speed of 7 m/s, at a deflector angle of 15° with an increase of 56.1% when it was compared to the turbine without any deflector with a Coefficient of power (Cp) value simulation of 0.2582
Analisis Performa Controllable Pitch Propeller ZF-KH680 pada Kapal AHTS 58,7 meter dengan Metode Computational Fluid Dynamics (CFD)
No full textAHTS vessels require an efficient propulsion system for complex operations. This study focuses on the performance analysis of a CPP on a 58,7 m AHTS vessel that failed to achieve its design speed during sea trials. The objective of this research is to analyze the propeller characteristics through 3D modeling, CFD simulations, and to compare the calculated speed with the sea trial results. The research methodology involves the development of a 3D CPP model validated against blade area data. CFD simulations were conducted to determine thrust and torque at various pitch settings ranging from 60% to 100%. Subsequently, engine– propeller matching calculations were performed, and the empirically calculated ship speeds were compared with sea trial results. The 3D CPP model validation against blade area data yielded an error of 2,141%. The simulation results show that increasing the pitch consistently increases thrust and torque. At J 0,2, a 60% pitch produced a thrust of 80146,335N and torque of 28710,812Nm, at 70% pitch thrust was 101320,310N and torque 39289,549Nm, at 80% pitch thrust was 121873,870N and torque 51500,903Nm, at 90% pitch thrust was 142205,420N and torque 65526,231Nm, and at 100% pitch thrust reached 162626,210N with torque 81493,923Nm. A significant discrepancy was found between the empirically calculated speed and the sea trial results. Based on the empirical calculations, the ship’s service speed at 60% to 100% pitch reached 9,09 knots, 10,03 knots, 10,99 knots, 11,99 knots, and 12,96 knots, respectively. In contrast, the recorded sea trial speeds at 60% to 100% pitch were only 6,7 knots, 7,3 knots, 7,9 knots, 8,8 knots, and 9,10 knots