Kumpulan Jurnal dan Prosiding Elektronik PPNS (Politeknik Perkapalan Negeri Surabaya - Pusat Penelitian dan Pengabdian Masyarakat, P3M)
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Numerical Study of the Effect of Blade Inward Inclines on the Performance of Darrieus Vertical Turbines as a Wave Energy Converter (WEC)
No full textThis study investigates the effect of blade inward inclined angle on the performance of a Darrieus vertical turbine as a wave energy converter (WEC). Numerical simulations were conducted using a Computational Fluid Dynamics (CFD) approach with OpenFOAM software, utilizing the interFoam model to represent the interaction between fluid flow and turbine structure. Variations were made at a blade inclination angle of 5° and Tip Speed Ratio (TSR) of 0.2 to 0.5. The simulation results show that the increase in TSR is directly proportional to the increase in torque coefficient (CT) and power coefficient (CP), which means that the turbine performance is more efficient in absorbing wave energy. Flow visualization using vorticity and Q-criterion shows vortex shedding at the trailing edge of the blades, which affects the turbine efficiency. The turbine design with an inclination angle of 5° was shown to improve the conversion of energy into rotational mechanical power, making it a promising alternative in sustainable ocean energy utilization
Studi Pengaruh Rasio Panjang Chord antara Hub dengan Tip terhadap Kinerja Wells Turbine
No full textThe Oscillating Water Column (OWC) is a type of wave energy converter that utilizes bidirectional airflow generated by ocean waves to drive a Wells turbine. One of the geometric parameters that affects turbine performance is the chord length ratio between the hub and tip of the blade. This study aims to analyze the effect of chord length ratio variations on the performance of a Wells turbine in an OWC system. Simulations were carried out using the Computational Fluid Dynamics (CFD) method with OpenFOAM software for four chord ratio variations: 0.8, 0.6, 1.0 (baseline), and 1.4, under tip speed ratio (TSR) values of 0.5, 1, 1.5, and 2. The main performance parameters observed include the coefficient of power (CP) and coefficient of torque (CT). The results show that the 1.0 chord ratio produces the highest CT and CP values across all TSR variations. This occurs because the 1.0 configuration provides a balanced rotor area distribution and solidity value, allowing it to consistently generate greater lift force and torque.
Keyword: Oscillating Water Column, Wells Turbine, Ratio Chord Length, Computational Fluid Dynamics, Turbine Performanc
Studi Numerik Pengaruh Variasi Jumlah Bilah Paddle pada Paddle Wheel terhadap Performa Kapal Wisata.
No full textThe application of paddle wheels as a boat propulsion system has become an important focus in practical research due to their operational stability for small boats and durability, especially in shallow-water operations. These operational characteristics make paddle wheels suitable for application in 8-meter tourist boats, where determining the optimal propulsion force is essential. In this study, the 12-blade configuration was selected as the baseline for evaluating propulsion performance. The objective is to analyze thrust generation and flow visualization around the paddle wheel using Computational Fluid Dynamics (CFD) in ANSYS Fluent with three-dimensional transient analysis at constant rotational speeds of 125 rpm and 250 rpm. The results showed that at 125 rpm, the paddle wheel generated an average thrust of 0.243 kN, dominated by negative fluctuations caused by backflow and vortex formation, which reduced propulsion efficiency. At 250 rpm, the average thrust increased to 0.499 kN, with fluctuations predominantly positive due to the higher blade velocity, which produced a stable jet flow and minimized the effect of recirculating vortices. Generally, an increase in paddle wheel rotational speed improved thrust performance. These findings emphasize the importance of optimizing paddle wheel speed and blade configuration for effective and stable propulsion in small tourist boats
STRATEGI PERAWATAN SISTEM PELUMASAN KAPAL MV. MERATUS KAPUAS DENGAN METODE RELIABILITY CENTERED MAINTENANCE II DAN PENDEKATAN LIFE CYCLE COST ANALYSIS
No full textThe main engine lubrication system on a ship serves to protect moving components. If this system does not work optimally, main engine performance will decrease, damage will occur faster, and maintenance and operational costs will increase. Therefore, it is important to analyze the damage of lubrication system components as a preventive measure, reduce the risk of failure, and support long-term strategic planning. This research aims to analyze the function, functional failure, and failure mode of the main engine lubrication system components using the Fault Tree Analysis and Failure Mode and Effect Analysis methods. The optimal maintenance strategy is determined based on the Reliability Centered Maintenance II method, and long-term cost efficiency is calculated using the Life Cycle Cost Analysis approach. RCM II results show LO. Purifier as a critical component, with an RPN value of 288, and the fastest initial maintenance interval compared to other components. The reliability value of LO. Purifier reliability value of 0.618 at t = 300 hours, with a schedule restorating task at 179.433 hours. The results of the cost analysis show that the lowest total cost was reached in the 11th year, namely IDR 117,998,457.55 (2 mechanics) and IDR 130,606,050.61 (4 mechanics). This indicates that the optimal economic life of the lubrication system is 11 years, before considering replacement or rejuvenation.
Keywords : FTA, FMEA, Reliability Centered Maintenance, Life Cycle Cost Analysis, Ship Lubrication Syste
Rancang Bangung Sistem Refrigerasi pada Media Supercooling untuk Surface Hardening
No full textIn modern industry, metal heat treatment technology is increasingly in demand because it is more economical than changing chemical composition to obtain certain mechanical properties. This study conducted heat treatment on cigarette machine cutting knives made from AISI 4140 alloy steel by surface hardening method using supercooling cooling media. Surface hardening is done by heating the steel to 650°C, then rapidly cooled (quenching) in a salt solution or brine cooled by a refrigeration system to -15°C. The research method includes the design of a refrigeration system and experimental studies related to the heat treatment process. The test results show that heat treatment with 650°C heating and quenching at -15°C produces a hardness of 758 HV or equivalent to 62 HRC from normal hardness 36 HRC, the hardness standards for industrial knives. From the test results and analysis, it can be concluded that the designed refrigeration system is able to produce an effective supercooling cooling medium to assist the surface hardening process. This allows the use of cheaper alloy steel while still achieving high hardness, making it more economical without reducing material performance
Studi Numerik Pengaruh Sudut Deflektor ? = 45° Di Depan Returning Blade Terhadap Performa Turbin Angin Savonius Myring n=1 Pada Kecepatan Angin 6 m/s
No full textSavonius-type wind turbines typically exhibit low efficiency due to high aerodynamic drag on the returning blade, so that performance improvements are needed. Based on the condition, this study investigates the effect of deflector angle variations placed in front of the returning blade to the performance of a Myring-type Savonius wind turbine (n=1). It used a numerical approach through Computational Fluid Dynamics (CFD) simulations. The deflector angles tested were 0°, 30°, 45°, and 60°, with wind speeds of 5 m/s, 6 m/s, and 7 m/s. The turbine had a height and diameter of 40 cm, while the deflector measured was 40 cm in height and 50 cm in width. The simulation result showed that a deflector angle of 45° at a wind speed of 6 m/s provided the best performance. The value of Coefficient of Torque (CT) was 0.2862 and the Coefficient of Power (CP) was 0.2283. The additional deflector angle effectively enhances turbine efficiency by mitigating reverse flow impact on the returning blade.
Keyword: Numerical, Angle Deflector ?=45°, Myring n = 1, Savonius Wind Turbine, Computational Fluid Dynamic
Analisis Heat Input terhadap Geometri Hasil Pengelasan FCAW Menggunakan Finite Element Method (FEM)
No full textWelding is one of the most important processes in the maritime industry for joining metal materials. One of the welding methods commonly used in the maritime industry is Flux-Cored Arc Welding (FCAW). However, there are several challenges encountered in the welding process, one of which is distortion. One of the factors causing distortion in the welding process is heat input. This study aims to analyze the effect of heat input on distortion in FCAW welding results on BKI Grade A steel using the Finite Element Method (FEM) in ANSYS Workbench software with a Transient Thermal and Static Structural approach. Heat input significantly affects the magnitude of distortion, where higher heat input results in greater distortion. This study varied two parameters in heat input: voltage and current strength, with variations of 21V, 110A; 21V, 150A; 21V, 190A; 30V, 110A; 30V, 150A; 30V, 190A. The heat input that produced the minimum distortion value was the 21V 110A variation, which was -0.029303 mm. Therefore, it can be concluded that selecting the appropriate welding parameters is crucial for minimizing distortion in BKI Grade A steel plates
Desain Sistem Cargo Pump Pada Modifikasi Kapal Coal Barge Menjadi Oil Barge Sesuai BKI Volume III Rules For Machinery Installations
No full textThe modification of a coal barge into an oil barge requires adjustments to the cargo distribution system to meet the characteristics of liquid fluid cargo and classification regulations. One of the main components that must be redesigned is the cargo pump system, which plays a vital role in transferring fluid from cargo tanks to storage facilities at ports or to other vessels. This study aims to design a cargo pump system in accordance with the provisions of the Indonesian Classification Bureau (BKI) Volume III on Machinery Installations. The design stages include collecting ship dimension data, calculating pump capacity, selecting pipe diameters and fittings, and validating the system using Pipe Flow Expert software. The analysis results show that the required capacity for the main cargo pump is 324.99 m³/h with a total head of 21.91 meters, while the stripping pump requires a capacity of 50 m³/h with a head of 19.28 meters. This system design is expected to serve as a technical reference in the ship modification process in compliance with safety standards and classification society regulations
Analisis Laju Kristalisasi Es Pada Cetakan Mesin Es Balok
No full textThis study aims to analyze the crystallization rate of ice in a block ice machine mold using a Computational Fluid Dynamics (CFD)-based simulation. The research focuses on a variation with the coil temperature set at –20 °C and the initial water temperature at 25 °C. The simulation results indicate that the total freezing time required is 20 hours, which is consistent with the existing conditions of the block ice machine used as a reference. These findings confirm that the operational parameters produce a stable freezing performance, although further optimization remains possible to improve efficiency
Analisis Keseragaman Aliran Dua Fase pada Multi Channel Distributor untuk Evaporator Mesin Es Balok
No full textIn the block ice machine at Politeknik Perkapalan Negeri Surabaya (PPNS), ice freezing delays occur due to uneven refrigerant distribution in the evaporator. This study focuses on two-phase flow uniformity analysis in a multi-channel distributor using Computational Fluid Dynamics (CFD) simulation with the Volume of Fluid (VOF) method. The research is limited to the vertical downward configuration to evaluate phase distribution, velocity, and static pressure. Simulation results show that the vertical downward configuration provides a uniform distribution with a deviation value of 11.14%, proving the positive effect of gravitational assistance on liquid phase stability. These findings can serve as a design reference for improving distributor performance in block ice machines