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Mekanika: Majalah Ilmiah Mekanika
Published by Universitas Sebelas Maret
ISSN : 14127962     EISSN : 25793144     DOI : https://doi.org/10.20961/mekanika
Core Subject :
"Mekanika: Majalah Ilmiah Mekanika" is an open-access journal published by Mechanical Engineering Study Program, Faculty of Engineering, Universitas Sebelas Maret. Mekanika invites scholars, researchers and practioners who have interest in mechanical engineering to publish their articles and also provides forums for them to share their works and knowledge. Mekanika focuses on the area of materials engineering and science, design, energy, manufacturing and construction but is not limited to. Both English and Bahasa are accepted in this journal. Mekanika has two issues every year (March and September) and aims to publish more frequently in the future.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 75 Documents
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Usage of Phase Change Material as Heat Storage in Water Desalination Pandjaitan, Leony Serenauli; Septiyanto, Muhamad Dwi; Hadi, Syamsul
Mekanika: Majalah Ilmiah Mekanika Vol 25, No 1 (2026): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v25i1.90218

Abstract

Phase Change Material (PCM) refers to substances that can absorb or release heat, making them effective for heat storage applications. PCMs can be categorized by chemical composition into three primary types: organic, inorganic, and eutectic. In Indonesia, a nation characterized by extended periods of sun exposure, selecting the most suitable PCM for solar still desalination experiments poses a challenge in reducing inefficient practical outcomes. This study investigates the properties of various PCMs and analyzes the essential factors to consider when choosing a PCM for heat storage. The research employs a review method using previously published literature from the Scopus database that incorporates PCM in solar still desalination. The results highlight five critical parameters for evaluation: physical properties, chemical properties, thermal properties, kinetic properties, and economic cost. For optimal compatibility with tropical environments, paraffin wax and soybean wax are the most appropriate choices, whereas coconut oil and beef tallow, which melt faster than wax, are better suited for subtropical regions.
Finite Element Modeling of Thickness Reduction and Displacement Behavior in 316L Stainless Steel Plates Under Corrosion States Melnyk, Oleksiy; Islami, Daffa Putra; Adiputra, Ristiyanto
Mekanika: Majalah Ilmiah Mekanika Vol 24, No 2 (2025): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v24i2.102853

Abstract

Structural steel corrosion is a critical engineering problem that can lead to catastrophic failures, resulting in loss of life, environmental harm, and substantial economic damage. Notable incidents, such as offshore platform collapses and ship hull breaches, have demonstrated the severe consequences of undetected or underestimated corrosion. In marine environments, crevice corrosion presents a particularly challenging case, as confined chemical conditions and the presence of barnacles promote localized degradation. Barnacles generate microcracks that accelerate the deterioration process. However, finite element modeling of crevice corrosion remains scarce and often relies on oversimplified geometries, which limits the accuracy in capturing actual corrosion volume, depth, and affected area. This study develops a 3D finite element model of barnacle-induced crevice corrosion on 316L stainless steel plates, based on long-term immersion data. Corrosion geometries were analyzed using laser scanning microscopy, with the analytical mapped field feature applied under transverse loading and random pit positions for exposure durations of 6, 12, and 36 months. The results reveal progressive increases in displacement (up to 17.27%), strain (30.8%), and stress (20.12%) compared to uncorroded plates, underscoring the substantial impact of localized corrosion on structural performance.
Implementation of Rooftop Solar Photovoltaic Systems in Educational Facilities at Ibu Kota Nusantara (IKN) Shame, Buruhan Haji; Haji, Mohammed M.; Prasetyo, Singgih Dwi
Mekanika: Majalah Ilmiah Mekanika Vol 24, No 1 (2025): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v24i1.92799

Abstract

The primary objective of this research is to evaluate the feasibility and potential benefits of integrating solar Photovoltaic (PV) systems in educational institutions within the new capital. The Hybrid Optimization of Multiple Energy Resources (HOMER) energy modeling software was utilized to achieve this, enabling a detailed analysis of the project's viability for investment over a specified timeframe. Key metrics such as Net Present Cost (NPC), Cost of Energy (COE), and Break-Even Point (BEP) were emphasized to assess the economic implications of the project. The findings of the research reveal that the rooftop solar PV system for schools in Ibu Kota Nusantara (IKN) has NPC of IDR 15,865,110,000.00, COE of IDR 1,174.26 per kWh, and a BEP occurring in the sixteenth year, as indicated by the simulation results. These outcomes suggest that the rooftop solar PV project is not only a viable solution but also holds significant potential for development. Furthermore, it supports the overarching goals of the capital relocation program while promoting the adoption of renewable energy sources in Indonesia, thereby contributing to a more sustainable future for the nation.
Performance Analysis of the Fast Platform Supply Vessel with a Conventional V-Hull Shape with the Addition of a Chine and a Different Bow Using Computational Fluid Dynamics Method Rumapea, Fedrik Immanuel; Bahatmaka, Aldias; Hamizan, Banin; Rahardian, Pramudya; Rantisi, Umar Zaid; Kurniaputri, Dias Fitria
Mekanika: Majalah Ilmiah Mekanika Vol 25, No 1 (2026): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v25i1.114601

Abstract

Indonesia is the largest country in Southeast Asia, consisting of more than 17,000 islands and a coastline of approximately 81,000 kilometers, with over half of its territory covered by water. To optimize this vast marine potential for public welfare, comprehensive data collection and mapping are essential. The oil and gas sector remains a key contributor to national revenue. For instance, Pertamina Hulu East Kalimantan (PHKT) exceeded its 2023 production target, achieving around 9,900 barrels of oil and 45 million cubic feet of gas per day. To support offshore operations, a Platform Supply Vessel (PSV) prototype named Bramantya was designed. This study analyzes the vessel using Computational Fluid Dynamics (CFD) to determine the optimal hull form for operational performance and fuel efficiency. Three hull variations were examined: a conventional hull, a hull with additional chines, and a wide-bow hull. The simulation was validated against previous experimental studies, showing consistent linear results with an average error of 4.25%. Simulations at Froude numbers 0.2–0.6 show that the wide downward-bowed hull reduces drag by 7.69% compared to the conventional hull, thereby improving fuel efficiency.
Analytical Review of Numerical Analysis in Hydrodynamic Performance of the Ship: Effect to Hull-Form Modifications Bahatmaka, Aldias; Fitriyana, Deni Fajar; Anis, Samsudin; Maulana, Achmad Yanuar; Tamamadin, Mamad; Lee, Sang Won; Cho, Joung Hyoung
Mekanika: Majalah Ilmiah Mekanika Vol 23, No 1 (2024): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v23i1.83635

Abstract

This review paper provides an overview of simulation-based hydrodynamic design optimization for ship hull forms. It also includes a numerical analysis aimed at accomplish early-stage simulation-based design in terms of hydrodynamic performance. A hydrodynamic module, a hull surface modeling module, and an optimization module are the primary components of this numerical analysis. The hydrodynamic module includes both simple design approaches and high-fidelity numeric tools; these integrated tools are used to evaluate hydrodynamic performances at different design stages. The hull surface modeling module offers a variety of techniques for ship hull surface representation and modification. It is also used to automatically create hull forms or change existing hull forms based on hydrodynamic performance and design constraints. The optimization module includes several optimization algorithms and surrogate models used to determine optimal designs in terms of hydrodynamic performance. Numerical findings indicate that the current tool is well suited for hull form design optimization at the early design stage because it can produce effective optimal designs within a short time.
Effect of Heating Temperature on Wear Rate, Tensile Strength, and Crystallinity of Cantula Fiber-Reinforced Magnesium/Hydroxyapatite/ Shellac for Bone Screw Material Maulana, Zufar; Triyono, Joko; Raharjo, Wijang Wisnu
Mekanika: Majalah Ilmiah Mekanika Vol 24, No 1 (2025): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v24i1.71171

Abstract

Bone screws are commonly used together with support plates to stabilize fractured bones. Conventional bone screws are typically made from metals such as stainless steel and titanium due to their superior mechanical properties. However, the use of permanent metallic implants often requires a secondary surgical procedure for removal after the bone has healed. Therefore, recent research has focused on developing biodegradable biomaterials that can gradually degrade within the body, eliminating the need for implant removal. This study investigated the effect of heating temperature on the tensile strength, wear rate, and crystallinity of a magnesium/nano-hydroxyapatite (nano-HA)/shellac/cantala fiber biocomposite. The composite materials were mixed using a blender with a volume ratio of magnesium/nano-HA–shellac/cantala fiber of 50/20/30 and then compacted at a pressure of 300 MPa for 10 minutes. Heat treatment was conducted at temperatures of 100 °C, 120 °C, 140 °C, and 160 °C for two hours. The results showed that the lowest wear rate (0.72 × 10⁻³ mm³/Nm), the highest tensile strength (6.58 MPa), and the highest crystallinity (74.15%) obtained from X-ray diffraction (XRD) analysis were all achieved at a heating temperature of 160 °C, indicating that higher heating temperatures improved the mechanical and structural properties of the biocomposite.
CFD Simulation Study on Airflow Dynamics Around a Cricket Ball: Effects of Velocity and Surface Modifications on Aerodynamic Performance Harsito, Catur; Kandimba, Enock Michael; Ramanda, Raihan Danu; Wicaksana, Putra Adil; Trisnoaji, Yuki; Prasetyo, Singgih Dwi
Mekanika: Majalah Ilmiah Mekanika Vol 25, No 1 (2026): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v25i1.104182

Abstract

This study investigates the aerodynamic behavior of a cricket ball at various velocities using Computational Fluid Dynamics (CFD) in ANSYS Fluent, focusing on the effects of speed and surface modifications on aerodynamic forces and pressure distribution. The cricket ball geometry was simplified by replacing the seam with a protruding flat surface. Simulations were performed at airflow velocities of 20, 30, and 40 m/s using the realizable k-ε turbulence model, with air properties set to a density of 1.225 kg/m³ and dynamic viscosity of 1.81×10-⁵ Pa-s. At 20 m/s, the inlet and outlet mass flow rates were 50.306891 kg/s and -50.306901 kg/s, with a net imbalance of        -9.3×10-⁶ kg/s, generating a drag force of 0.5 N, a lift force of 0.2 N, and a pressure difference of 50 Pa. At 30 m/s, the inlet and outlet rates were 75.460373 kg/s and -75.464958 kg/s, respectively, resulting in a net imbalance of -0.004585 kg/s. The flow was fully turbulent, producing a drag force of 3.5 N, a lift force of 1.5 N, and a pressure difference of 250 Pa. Increasing velocity boosts drag, lift, and pressure differences. At the same time, the flat surface enhances asymmetry, vortices, and swing at higher speeds.
Patrol Boat Strengthening Against a Collision with COLL Notation Based on Class Rules and Regulation in Indonesia – An Overview Fuadi, Abid Paripurna; Muttaqie, Teguh; Nugroho, Andi Cahyo Prasetyo Tri; Kusuma, Yudiawan Fajar; Mukti, Suherman; Kurniawan, Mohammad Arif; Firmandha, Topan; Ismail, Muhammad
Mekanika: Majalah Ilmiah Mekanika Vol 23, No 1 (2024): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v23i1.74967

Abstract

Indonesian maritime security and law enforcement rely frequently on Patrol boats. However, collisions can occur during the operation, leading to potential loss of life, damage to the ship, and environmental harm. In preventing such incidents, the government needs to strengthen the patrol boats against collisions in accordance with class rules and regulations in Indonesia.The COLL notation is an additional notation for vessel collision protection, which specifies the required strength of the vessel's hull and structural components to minimize the risk of damage and reduce the consequences of a collision. This study highlights the key areas that require strengthening, including the vessel’s bow, stern, and hull, as well as the propulsion system that needs to be considered in the design stage. The addition of collision bulkheads, increasing the hull plating thickness, and reinforcing the engine mounts and shafting are also necessary to ensure the vessel's safety against collision. In conclusion, strengthening patrol boats against a collision with COLL notation based on class rules and regulations in Indonesia is one of the methods available that can be applied for the design stage to increase the level of operational safety of patrol boats.
Seakeeping Analysis of Floating Structures with Pipe Integration Based on the Boundary Element Method Onyshchenko, Svitlana; Faizatama, Alfido Marchandi; Firdaus, Nurman; Adiputra, Ristiyanto
Mekanika: Majalah Ilmiah Mekanika Vol 24, No 2 (2025): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v24i2.103847

Abstract

Floating structures are key components in offshore renewable energy systems. In the development of energy conversion, several integrated components are required, one of which is the Cold-Water Pipe (CWP). This integration will affect the interaction of the structure with environmental loads such as waves and currents, which influence the stability and seakeeping of the structure. This study employs computational analysis based on the Boundary Element Method (BEM) to more efficiently evaluate the hydrodynamic response of full-scale structures. Response Amplitude Operator (RAO), additional mass, motion response, and mooring line tension are identified as the main parameters. It was found that all these parameters are sensitive to mesh discretization. A mesh convergence study was conducted using mesh sizes of 1.8, 2.1, 2.2, and 2.3 m, which produced consistent RAO and additional mass values. Conversely, mesh sizes of 1.9, 2.0, 2.4, and 2.5 m showed inconsistencies in stability results at sea. The coarsest net (2.5 m) produced errors of up to 33% in swing, heave, and roll motions, with greater deviations in heave motion. However, tension on the mooring line remained relatively stable, indicating reduced sensitivity to variations in net size.
Reducing Cogging Torque in V-Shaped BLDC Motors: A FEA Simulation Study on the Impact of Skew Angle Mandasari, Dewi Rianti; Sudiarto, Budi; Amelia, Lia; Suryandi, Asep Andi
Mekanika: Majalah Ilmiah Mekanika Vol 23, No 1 (2024): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v23i1.83242

Abstract

This study thoroughly investigated the impact of stator skew angles on cogging torque in V-shape Brushless Direct Current (BLDC) motors, focusing on electric vehicle applications. Using Finite Element Analysis (FEA) with ANSYS Maxwell, the research assessed how variations in stator core skewness affect torque performance, prioritizing the reduction of cogging torque known for inducing undesirable fluctuations during rotor movement, impacting motor smoothness and noise levels. FEA calculations reveal a significant reduction in cogging torque with the introduction of skew angles to the stator core, enhancing motor efficiency. The study introduces novelty by analyzing the magnetic flux distribution resulting from skew angle variations. Simulation results, particularly on no-load characteristics based on D-axis flux linkage data, offer a comprehensive overview of the motor’s response under no mechanical load. Observations showed that D-axis flux linkage values decreased with increasing stator skew angle, indicating a shift in winding angle. This decline in D-axis flux linkage under no-load conditions demonstrates how variations in stator core skew angles impacted magnetic flux distribution, resulting in different values and promoting a more uniform flux linkage waveform. Increased stator core skew angles correlated with reduced flux linkage values, contributing to decreased cogging torque fluctuations and smoother BLDC motor operation.

Page 7 of 8 | Total Record : 75

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