Kumpulan Jurnal dan Prosiding Elektronik PPNS (Politeknik Perkapalan Negeri Surabaya - Pusat Penelitian dan Pengabdian Masyarakat, P3M)
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STUDI NUMERIK PENGARUH VARIASI PANJANG DEFLEKTOR DI DEPAN RETURNING BLADE TERHADAP PERFORMA TURBIN ANGIN SAVONIUS MYRING n=1
No full textThe experiment on the Savonius wind turbine with Myring n=1, by adding a deflector in front of the returning blade, has been proven to improve its performance. However, one limitation of the experiment was the inability to visualize the airflow, such as velocity contours, streamline velocity, and pressure contours. Therefore, this study was conducted to provide a visualization of the airflow. This research uses a numerical analysis method with the aid of computational fluid dynamics (CFD)-based software in a 3D model. The study employs a Savonius wind turbine model with Myring n=1, having a diameter and height of 40 cm. The variations in deflector length used are 10 cm, 20 cm, 30 cm, and 40 cm. The simulation results showed a performance improvement of 17,8% compared to the Savonius wind turbine with Myring n=1 without a deflector, with the highest coefficient of power value occurring at a TSR of 0,8, reaching a value of 0,24
Analisis Laju Kristalisasi Es pada Cetakan Mesin Es Balok dengan Menggunakan Brine
No full textBlock ice machines are widely used for fish preservation because they are practical and efficient. The block ice machine operated at Shipbuilding Institute of Polytechnic Surabaya (PPNS) previously had limitations in its mold design, so that the ice freezing process was not optimal and could not be completed on schedule. This study analyzes the ice crystallization process in ice block machine molds using brine as a secondary refrigerant. Brine has a lower freezing point than pure water, enabling it to reach low temperatures without freezing and accelerating the crystallization process. Two-dimensional numerical modeling was performed using Ansys Fluent with the Volume of Fluid (VOF) and Solidification/Melting models. The simulation focused on Brine conditions with an initial temperature of 10 °C and a salt concentration of 23.3%. The results showed that the freezing process began at 15 hours in the water domain in direct contact with the mold. The water froze completely at 18 hours with a temperature of -0.39 °C and a Brine temperature of -4.39 °C. At the 30th hour, the water/ice temperature reached -6 °C in the center of the domain and the brine temperature reached -9.6 °C. These findings confirm that brine effectively improves the efficiency and performance of block ice machines
Numerical Study of the Effect of Blade Number And RPM on Axial Fan Performance
No full textShipbuilding Institute of Polytechnic Surabaya (PPNS) manufactures axial fans through innovation from the independent entrepreneurship program, but further analysis is needed to determine the performance of the axial fan. A simulation-based study was conducted to determine the effect of the number of blades and RPM on the efficiency of the axial fan, with blade variations of 8 and 9, and RPM variations of 1330 and 1280. The axial fan simulation was conducted using 3D modeling based on CFD (Computational Fluid Dynamics). This simulation aimed to determine the effect of the number of blades and RPM on the flow coefficient and pressure generated by the axial fan, while RPM was varied to observe the performance trends of the axial fan at different speeds in relation to the flow coefficient and pressure. Based on the simulation and experimental results, the flow coefficient at RPM 1330 was 0.264545, and the experimental result was 0.265377 with an error of 0.31%. At the lowest RPM of 1180, the flow coefficient value was 0.202533, and the experimental result was 0.193156 with an error of 0.48%. for blade 8, while for blade 9, the flow coefficient at 1330 RPM is 0.240420 and at the lowest RPM of 1180 is 0.182842. Meanwhile, for static pressure at 1330 RPM, the value is 246.95 Pa and the experimental result is 246.67 Pa with an error of 0.11%, and at the lowest RPM of 1180, the value is 186.72 Pa and the experimental result is 186.67 Pa with an error of 0.03% for blade 8. while for blade 9 at 1330 RPM, the static pressure value is 214.49 Pa and at the smallest RPM of 1180, it is 162.93 Pa. This indicates that as the number of blades increases, the flow coefficient value decreases, as does the static pressure. The simulation results show that the flow coefficient and static pressure values are close to or validated by the experimental results with an error below 1%
Studi Numerik Pengaruh Variasi Bentuk Bilah Pada Paddle Wheel Terhadap Performa Kapal Wisata
No full textThis study analyzes the performance of paddle wheel blades with an NACA 2412 profile as an alternative propulsion system for river cruise ships. The paddle wheel used has 8 blades with a diameter of 0.84 m, a blade length of 0.21 m, and a blade width of 0.50 m. The NACA 2412 profile was chosen because it has moderate camber, that can provide optimal thrust distribution compared to symmetrical airfoils. Numerical simulations were performed using the compuuter model method with transient. The paddle wheel rotation speeds were 125 RPM and 250 RPM. The simulation results showed that at 125 RPM, the paddle wheel with 8 blades with the NACA 2412 profile produced a thrust of 1567.39 N. At 250 RPM it increased significantly to 3154.90 N. The thrust value proved that the NACA 2412 blades with an 8-blade is configuration to provide capable the operational needs of thrust boat to travel at a speed of around 8.5 knots (4.37 m/s). Computere models therefire boat, paddle wheel blades using the NACA 2412 profile are recommended as the optimal design because they are capable of producing high thrust while being efficient for use on river tourist boats
Rekomendasi Pemeliharaan Sistem Pelumas pada Mesin Induk MV. Meratus Borneo dengan Metode RCM II dan Cost-Benefit Analysis
No full textPelumasan pada mesin utama di kapal sangat penting untuk menjaga agar komponen yang bergerak tidak cepat aus atau rusak. Kinerja sistem pelumasan yang tidak optimal akan menurunkan performa mesin induk dan dapat menyebabkan downtime yang tidak terduga dengan biaya perbaikan yang besar. Maka dari itu, untuk mengantisipasi dan menekan risiko kegagalan pada sistem pelumasan, perlu dilakukan analisis kerusakan pada setiap komponen pelumas. Rekomendasi pemeliharaan yang baik dapat ditentukan melalui metode reliability centered maintenance II, serta menghitung kelayakan strategi pemeliharaan secara ekonomis dengan menggunakan cost-benefit analysis. Hasil dari metode RCM II menunjukkan bahwa lube oil pump adalah komponen paling berisiko yang memiliki nilai RPN 64 dengan scheduled discard task pada interval waktu 3708,44 jam. Selain itu, nilai reliability lube oil pump adalah sebesar 0,604 pada t = 6000 jam. Hasil analisis biaya menunjukan bahwa nilai benefit-cost ratio untuk lube oil pump adalah 26,92. Hal ini menunjukan bahwa strategi pemeliharaan yang dipilih layak secara ekonomis karena nilai BCR > 1
PENTINGNYA KUALITAS PELAYANAN & FASILITAS GALANGAN TERHADAP KEPUASAN PELANGGAN DI BANYUWANGI
Full text linkService quality and facilities are essential factors in enhancing company performance toward customer satisfaction. This study was conducted at PT. Blambangan Bahari Shipyard, a shipyard located in Banyuwangi that focuses on the construction and repair of fiber and wooden vessels. The purpose of this research is to explain the influence of service quality and shipyard facilities on customer satisfaction, both partially and simultaneously. To assess the extent to which service quality and shipyard facilities affect customer satisfaction, multiple linear regression analysis was employed, along with tests and ANOVA to examine the impact of these variables. The population of this study consisted of all customers of PT. Blambangan Bahari Shipyard from 2020 to 2024, with a sample of 33 customers/respondents. The results indicate that both service quality and shipyard facilities have a significant influence on customer satisfaction, both partially and simultaneously. The implications of these findings suggest that improving service quality and shipyard facilities has a positive impact on customer satisfaction, and therefore should be a priority for the company
STUDI NUMERIK PENGARUH VARIASI SUDUT DEFLEKTOR DI DEPAN RETURNING BLADE TURBIN ANGIN SAVONIUS MYRING n=1 KECEPATAN ANGIN 6m/s
No full textMany variation models are carried out to optimize the performance of the Savonius wind turbine. From the various variations that have been carried out, there are various ways to optimize the performance of the Savonius wind turbine. In this study, it was carried out by varying the angle of the deflector in front of the returning blade of the Savonius turbine. The experiment was carried out using a Myring Savonius wind turbine n = 1 with a height and diameter of 40 cm, with a deflector of 50 cm long and 40 cm high using a wind speed of 6 m / s. The variation of the angle of the deflector in front of the returning blade was 30o, 35o, 45o, 60o. The study was conducted using numerical simulations with the Computational Fluid Dynamic method. The study obtained the highest value of the Coefficient of Power (Cp) of 0.1807 at TSR 0.8 on a wind turbine without a deflector. The coefficient of power (CP) values show that adding a deflector in front of the returning blade at angles of 30°, 35°, 45°, and 60° reduces Savonius turbine performance by -45.7% at the 30° angle, -30.8% at the 35° angle, -24.8% at the 45° angle, and -22.8% at the 60° angle. This study concludes that adding a deflector in front of the returning blade can reduce Savonius wind turbine performance. This research contributes to the development of more efficient wind turbine designs and can serve as a reference for future studies in the field of renewable energy
Studi Numerik Pengaruh Variasi Letak Deflektor Di Depan Returning Blade Terhadap Performa Turbin Angin Savonius Dengan Myring n=1
No full textThis study aims to evaluate the effect of deflector position variations in front of the returning blade on the performance of Savonius wind turbines using blade shapes with Myring n = 1. Previous studies have evaluated this configuration experimentally, but have not been able to provide a comprehensive visualisation of fluid flow, such as streamline velocity, velocity contours, and pressure contours. Therefore, in this study, three-dimensional Computational Fluid Dynamics (CFD) numerical simulations were conducted to validate the experimental results and present flow visualisations. The simulation was conducted using a turbine with a diameter and height of 0.4 m, a constant wind speed of 6 m/s, and variations without a deflector and with a deflector positioned at distances of 10 cm, 20 cm, 30 cm, and 40 cm. The simulation results showed that the use of a deflector could increase the Coefficient of Torque (Ct) and Coefficient of Power (Cp) values, with a Coefficient of Torque (Ct) performance of 0.5127 at TSR 0.4 and a Coefficient of Power (Cp) of 0.2771 at TSR 0.8 without a deflector and at a deflector distance of 20 cm with a Coefficient of Torque (Ct) at TSR 0.4 with a value of 0.6089 and a Coefficient of Power (Cp) at TSR 0.8 with a value of 0.2933. The Cp value increased by 5.82% compared to without a deflector
ANALISIS RISIKO OPERASIONAL PERAWATAN BERKALA PADA AUXILIARY ENGINE UNTUK MENGURANGI PENINNGKATAN BIAYA OVERHAUL DENGAN METODE FMEA DAN FTA
Full text linkDelivering the efficiency and effectiveness of operations in the Auxiliary Engine system, it is essential to improve the quality of planning, scheduling, and maintenance management, particularly during General Overhaul activities. Every maintenance process inevitably carries potential risks that may affect the continuity of ship operations. Therefore, this study was conducted to identify, analyze, and anticipate the risks that may arise during the maintenance of the Auxiliary Engine, as well as to propose appropriate mitigation strategies. The methodology applied combines Failure Mode and Effect Analysis (FMEA), which is used to determine the level of risk based on the Risk Priority Number (RPN), and Fault Tree Analysis (FTA), which is applied to investigate the root causes of priority risks. The results of the FMEA identified 15 sub-risks across several categories, with 6 of them classified as priority risks. These priority risks were then further examined using FTA to provide a clearer understanding of their root causes. Finally, this research proposes risk mitigation strategies that can minimize potential impacts and prevent recurring failures during the General Overhaul process of the Auxiliary Engine
ANALISIS DAN MITIGASI RISIKO INSTALASI LISTRIK DENGAN METODE FMEA DAAN FTA PADA DEPARTEMEN FASILITAS TERMINAL DI PERUSAHAAN PENYEDIA JASA TERMINAL DAN BONGKAR MUAT SURABAYA
Full text linkFree trade and technological advancements have increased global cargo flows, positioning container terminals as vital nodes in the supply chain. The Surabaya Terminal and Stevedoring Service Company plays a strategic role, yet the risk of electrical installation failures threatens business sustainability. This study aims to identify, evaluate, and propose mitigation measures for electrical installation risks in the Terminal Facilities Department, employing the Failure Mode and Effect Analysis (FMEA) method for risk prioritization and Fault Tree Analysis (FTA) for mitigation planning. The results reveal four highest-priority risks: electric shock (RPN 342.00), cable wear on crane and reefer yard lines (RPN 274.44), aging electrical infrastructure (RPN 263.89), and non-compliance with SOPs (RPN 211.11), all of which fall within the red zone (high risk) of the risk map. FTA calculations rank electric shock as the top risk with a probability of 25.6%. Recommended mitigation measures include inspecting and replacing exposed cables, improving PPE compliance, managing PPE stock, enforcing work procedures, and conducting regular occupational safety training to foster a strong safety culture