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Rizal Mahmud
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Institut Teknologi Adhi Tama Surabaya Jl. Arief Rahman Hakim No. 100, Surabaya, East Java, Indonesia 60117
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Journal of Mechanical Engineering, Science, and Innovation
Published by Institut Teknologi Adhi Tama Surabaya
ISSN : 2776933X     EISSN : 27763536     DOI : https://doi.org/10.31284/j.jmesi
Core Subject : Science, Engineering,
Control & Systems Engineering Energy Engineering Mechanical Engineering
Journal of Mechanical Engineering, Science, and Innovation (JMESI) is a peer-reviewed journal in English published two issues per year (in April and October). JMESI dedicated to publishing quality and innovative research in the field of mechanical engineering and science, thereby promoting applications to engineering problem. It encompasses the engineering of energy, mechanical, materials, and manufacturing, but it is not limited to scopes. Those are allowed to discuss on the following scope: Energy: Energy Conversion, Energy Conservation, Renewable Energy, Energy Technology, Energy Management. Mechanical: Applied Mechanics, Automobiles and Automotive Engineering, Tribology, Biomechanics, Dynamic and Vibration, Mechanical System Design, Mechatronics. Material: Material Science, Composite and Smart Material, Micro and Nano Engineering, Powder Metallurgy. Manufacturing: Advanced Manufacturing Techniques, Automation in Manufacturing, Modelling, and Optimization of Manufacturing Processes.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 71 Documents
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Production and Characteristics Test of Bio-Char Briquettes from Coconut Shells and Corncobs to Optimize Agricultural Waste in Indonesia Ramadhana, Adriansyah Karunia; Hidayat, Muhamad Farhan; Muhaji, Muhaji; Abdullah, Muhamad Yunus
Journal of Mechanical Engineering, Science, and Innovation Vol 5, No 1 (2025): (April)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2025.v5i1.7613

Abstract

Biomass waste is one of the potentials that can be utilized to become alternative energy that can contribute to sustainable development. With briquetting, waste that previously had no benefit can be used as a renewable energy source. In this study aims to compare the characteristics (moisture content, ash content, volatile matter content, bound carbon content and calorific value) of raw materials (coconut shell, corn cob and tapioca flour) and then test characteristics after the raw materials are briquetted. The results of this study with briquetting of waste were able to produce 3.78% moisture content, 11.7% ash content, 0.869 volatile matter content, 5512 cal/g calorific value and 83.651% bound carbon content. So that briquetting can be one of the innovations to optimize the utilization of waste to be processed into renewable energy.
Simulation and Optimization of Hybrid Energy Systems for Green Hydrogen Production in Industrial Settings Arianto, Supri; Rahayu, Yeni Sri; Suwarno, Suwarno
Journal of Mechanical Engineering, Science, and Innovation Vol 5, No 2 (2025): (October)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2025.v5i2.7795

Abstract

The global push toward Net Zero Emissions (NZE) has positioned green hydrogen as a key component in sustainable energy strategies. In Indonesia, the energy sector contributes over 40% of national emissions, prompting the need for increased renewable energy integration. However, green hydrogen production remains limited due to high costs and dependency on fossil-based electricity. This study focuses on a hydrogen production facility located in the Gresik industrial port area, which currently relies 91% on electricity from the national grid. To address this, we propose a hybrid energy system combining photovoltaic (PV) and grid power. The goal is to reduce the Levelized Cost of Energy (LCOE) while increasing the share of renewable energy in hydrogen production.A simulation-based approach was used, employing HOMER Pro software with real industrial operational data as input. Several scenarios were developed by varying PV capacity and daily load demand. The optimal configuration consisting of a 6.179 MWp PV system and a 5,000 kWh/day load resulted in the lowest LCOE of IDR 2,175/kWh, compared to the baseline of IDR 2,783/kWh. The renewable energy share also increased from 9% to 21%.Additionally, performance analysis showed that the actual PV system efficiency was 21%, slightly lower than its theoretical efficiency due to seasonal weather variations. These results indicate that higher PV integration and larger energy loads significantly improve both cost-effectiveness and renewable energy penetration.This study demonstrates a practical, data-driven approach for optimizing green hydrogen production systems in industrial environments.
Modelling and Cost Assessment of Hydrogen Production with Hybrid Energy Sources Rahayu, Yeni Sri; Arianto, Supri; Suwarno, Suwarno
Journal of Mechanical Engineering, Science, and Innovation Vol 5, No 2 (2025): (October)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2025.v5i2.7796

Abstract

Green hydrogen production holds significant potential for supporting Indonesia's clean energy transition towards Net Zero Emissions (NZE) by 2060. However, its current Levelized Cost of Hydrogen (LCOH) of USD 4.3 to USD 8.3 per kilogram makes it less cost-effective than fossil fuel-derived hydrogen. This study aims to analyze the economics of a Hydrogen Plant (H2P) utilizing hybrid energy sources in Gresik. The methodology integrates advanced modeling techniques, including the Levelized Cost of Hydrogen (LCOH) and Net Present Value (NPV) analysis, to quantify production costs and assess long-term profitability. Data for this study was meticulously collected from a Hydrogen Plant in Gresik through historical operational records, technical specifications, projected energy demand, and meteorological data. By systematically comparing five alternative configurations: Grid+Solar PV (50,6 kWp), Grid+Solar PV (100 kWp), Grid+Solar PV (200 kWp), Grid+Solar PV (400 kWp), and Grid+Microhydro (76 kW). Configuration 5 was found to be the most economical under current assumptions, achieving the lowest LCOH of IDR 100.023/kg (USD 6,23/kg) and the highest NPV (IDR 22.935.241.285). This result is align with global decarbonization goals which are projected to be economically competitive at USD 2/kg by 2050.
Comparative Performance of Material Extrusion and Vat Photopolymerization Systems for Automotive Product Tanoto, Yopi Yusuf; Sugiarto, Nicholas Adriel; Hernando, Ivan Christian; Anggono, Willyanto
Journal of Mechanical Engineering, Science, and Innovation Vol 5, No 2 (2025): (October)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2025.v5i2.8201

Abstract

Additive Manufacturing (AM) has emerged as a rapidly developing technology with applications ranging from product visualization and prototype fabrication to actual production. Various types of AM are available on the market, broadly categorized into industrial-grade and consumer-grade machines. This study focuses on consumer-grade printers, which are more affordable and widely accessible. Among these, the two most commonly used technologies are Material Extrusion (ME) and Vat Photopolymerization (VP). While the performance of ME printers has been widely investigated, comparative studies between ME and VP remain limited. This research provides a performance comparison of the two technologies. The findings indicate that VP printers outperform ME in terms of printing speed and energy efficiency. On the other hand, FDM printers offer advantages in material cost and dimensional accuracy in the Z direction. Furthermore, the study examines the potential of consumer-grade printers to support automotive product prototyping efficiently and practically.
Cover and Editorial Page Arifin, Ahmad Anas
Journal of Mechanical Engineering, Science, and Innovation Vol 5, No 2 (2025): (October)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Hardness Analysis, Hydrogen Test and Welding Size on Seamless Steel Pipes API 5L Gr.X65 PSL2 with Post Weld Heat Treatment (PWHT) Kurniawan, Pradhana; Darto, Darto; Annaufal, Ubbayu
Journal of Mechanical Engineering, Science, and Innovation Vol 5, No 2 (2025): (October)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2025.v5i2.7968

Abstract

Seamless steel pipes in oil and gas pipeline applications will provide quite high pressure, so the welding process is important in ensuring pipe safety. This study aims to analyze the hardness, hydrogen test and welding size of seamless steel pipes that undergo post weld heat treatment (PWHT) process. The pipe diameter dimension is 6 inches with API 5L Gr.X65 PSL2 type. The experimental method begins with the PWHT process by heating to a temperature of 625 ° C with a holding time of 1 hour 10 minutes then slowly cooled with a cooling rate of 154 ° C / hour. The specimens that underwent PWHT were then analyzed for hardness, hydrogen test and welding size simulation. The hardness results decreased after PWHT at all basic metal, HAZ and center of weld positions. Position 0 ° ranges from 126-174 HRB, position 120 ° produces a value of 122 - 143 HRB and position 270 ° has a value of 133-154 HRB. The decrease in hardness occurs due to the tempering process which reduces residual stress. The pressure generated in the hydrogen test does not exceed the yield strength of the API 5L Gr.X65 PSL2 pipe material, which is 65,300 psi. The maximum weld size simulation results are produced with a value of 6,448 mm and a minimum value of 1,572 mm. The maximum value is used as a reference in welding to produce a safe connection.
Analysis of Tube Expansion Percentage on Microstructure and Hardness of 316L Stainless Steel Tube-to-Tubesheet Connections with GTAW Process Syaiful Amri, Moh.; Bachtiar, Bachtiar; Miftachul Munir, Moh.; Mukhlis, Mukhlis; Ari, Muhammad; Kurniawan, Ilham
Journal of Mechanical Engineering, Science, and Innovation Vol 5, No 2 (2025): (October)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2025.v5i2.8161

Abstract

This study analyzes the effect of varying tube expansion percentages on the mechanical properties, microstructure, and hardness of SA-213 TP316L tubes joined to SA-240 TP316L tubesheets in a shell-and-tube type heat exchanger. The tube expansion process was carried out using a roller expander with three expansion levels: 4%, 8%, and 12%, followed by Gas Tungsten Arc Welding (GTAW) at 150 A. Microstructural observations revealed that all joint zones were dominated by austenite with small amounts of delta ferrite, where increasing expansion percentages induced significant changes in the expand area: slight deformation at 4%, grain elongation at 8%, and pronounced grain distortion at 12%. Macrostructural observations showed perfect fusion between the tube and tubesheet for all variations, with no macro defects such as lack of fusion or porosity. Vickers hardness testing indicated the highest values in the expand area for all variations, with a maximum of 377 Kgf/mm², exceeding the standard limit of 250 Kgf/mm² for stainless steel. The hardness of the base metal was around 180 Kgf/mm², while the weld metal ranged from 220–230 Kgf/mm² due to delta ferrite formation. The increase in hardness in the expand area was attributed to cold working effects, indicating that post-tube expansion heat treatment is necessary to reduce residual stresses and restore the optimal mechanical properties of the material.
Performance Enhancement of Motorcycle Engines Using Lemongrass Oil-Based Fuel Additive Budi, Pangga Urip Setio; Suhara, Ade; Supriyanto, Agus; Patya, Dhea Intan; Khoirudin, Khoirudin; Nanda, Rizki Aulia
Journal of Mechanical Engineering, Science, and Innovation Vol 5, No 2 (2025): (October)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2025.v5i2.7778

Abstract

The increasing number of motor vehicles has led to higher fuel consumption, especially among two-wheeled vehicles, contributing to elevated emissions of hydrocarbon (HC) and carbon monoxide (CO). This study investigates the potential of lemongrass oil (LO) as natural additive to reduce exhaust emissions from RON 92 fuel. The LO was extracted via maceration and characterized by its physical properties, including density (0.893 g/mL), viscosity (5.30 mPa.s), and boiling point (222 °C), consistent with pure LO standards. The additive as then blended into RON 92 fuel in concentration of 10 mL, 15 mL, and 20 mL per 1000 mL of fuel to determine its optimal performance. Results showed that a 20 mL addition yielded the highest reduction in HC and CO emissions, respectively 49.76% and 46.24%. Furthermore, engine performance improved, with power increasing by 0.27 HP and torque by 0.21 Nm within an engine speed range of 5200-5700 rpm. These outcomes suggest that LO enhances combustion efficiency and reduces emissions. The findings highlight the potential of LO as an environmentally friendly fuel additive and supprt ongoing efforts to develop sustainable alternatives to conventional fossil fuels in Indonesia.
Impact of Embedded Pipe Configuration in Phase Change Material on Photovoltaic Cooling Diana, Lohdy; Aziz, Abdul; Safitra, Arrad Ghani; Pratilastiarso, Joke; Kusumawati, Eny
Journal of Mechanical Engineering, Science, and Innovation Vol 5, No 2 (2025): (October)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2025.v5i2.8177

Abstract

The photovoltaic as a solar power plant is increasingly widespread as renewable energy. However, high photovoltaic surface temperatures can reduce performance in generating electricity. Based on these problems, a photovoltaic cooling system is needed. This research aims to produce effective photovoltaic cooling by planting pipes that carry cold fluid embedded in Phase Change Material. The experimental research used solar simulator, there are three variations of pipe configuration, including: parallel, serpentine, and circular. The photovoltaic used in this research has a specification of 50WP. This study examines the effect of various cooling pipe configurations on thermal performance, output power, and the reduction of photovoltaic temperature. The results show the serpentine pipe configuration exhibits the highest thermal efficiency initially but declines drastically over time, while the circular pipe design demonstrates the best long-term stability and efficiency. Specifically, the circular pipe variation effectively reduces the photovoltaic surface temperature, maintaining the lowest temperature of around 42°C at the 80th minute, compared to higher peak temperatures in the unmodified variation 67°C, serpentine 50°C, and parallel 45°C. Overall, the circular pipe design is identified as the most effective cooling method for maintaining low surface temperatures and ensuring stable performance in photovoltaic panels.
Analysis of the Characteristics of Cow Dung Waste Biopellets with Cassava Peel Starch Adhesive as an Alternative Fuel Kusuma, Indra; Sulistiawan, Agus; Yuwita, Pelangi Eka
Journal of Mechanical Engineering, Science, and Innovation Vol 5, No 2 (2025): (October)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2025.v5i2.8092

Abstract

This study aims to analyze the characteristics of biopellets made from the raw material of dried cow dung waste with cassava peel starch as an adhesive. The research method was carried out experimentally through several stages: raw material preparation, drying of cow dung under sunlight for 14 days, mixing with variations of cassava peel starch adhesive of 10%, 30%, and 50%, molding using a hydraulic press with pressures of 50, 60, and 70 kg, and testing the characteristics of the biopellets. The parameters tested included calorific value, moisture content, combustion rate, and ash content. The results showed that variations in adhesive levels and molding pressure affected the quality of the biopellets. The calorific value obtained ranged from 2,795.4 to 3,595.9 cal/g, moisture content 9.5–12.5%, combustion rate 0.74–1.71 g/min, and ash content 0.90–1.20%. In conclusion, biopellets from cow dung with the addition of cassava peel starch adhesive have characteristics that are feasible to be developed as an environmentally friendly alternative fuel.

Page 7 of 8 | Total Record : 71

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