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Scientific Journal of Mechanical Engineering Kinematika
Published by Universitas Lambung Mangkurat
ISSN : 26559048     EISSN : 2655903X     DOI : http://dx.doi.org/10.20527
Core Subject : Science, Engineering,
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
Scientific Journal of Mechanical Engineering Kinematika (SJME Kinematika) is a mechanical engineering journal that focuses on Energy, Applied Mechanics, Materials, Manufacturing Processes. SJME Kinematics journal publish in Indonesian and receive in English. Scientific Journal of Mechanical Engineering Kinematika (SJME Kinematika) is an Open Access Journal that is available for free on online media. We are not only accept journals that focus on the derivatives of the four fields below, but also the possibility of an integrated focus of fields from several fields.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 181 Documents
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PELACAKAN DAYA MAKSIMUM PADA PEM FUEL CELL MENGGUNAKAN PARTICLE SWARM OPTIMIZATION TERINTEGRASI INTERLEAVED BUCK-BOOST CONVERTER Pressa P. S. Saputra; Zainal Mustakim; Heri Ardiansyah; Rifqi Firmansyah
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i1.848

Abstract

This study proposes a Maximum Power Point Tracking (MPPT) method based on Particle Swarm Optimization (PSO) to enhance power extraction performance in Proton Exchange Membrane Fuel Cell (PEMFC) systems operating under dynamic and varying environmental conditions. The proposed method is designed to optimize the system's operating point to ensure that the power generated by the fuel cell is fully utilized. In this research, the PSO algorithm is integrated with an Interleaved Boost–Buck Converter (IBBC), which functions to reduce current ripple and improve the stability of the output power in the energy conversion system. This integration is expected to provide a faster and more efficient system response in adjusting to changes in operational conditions. One of the main challenges in implementing MPPT in PEMFC-based systems is the nonlinear characteristics of PEMFC itself, which are highly influenced by various external parameters such as operating temperature, hydrogen pressure, and membrane water content. Variations in these parameters can cause fluctuations in output voltage and current, making the maximum power point tracking process more complex. Therefore, an adaptive optimization method with good convergence ability is required. Simulation results demonstrate that the proposed PSO method achieves a tracking accuracy of up to 99.96% with a settling time of 2 seconds under varying membrane water content conditions. The PSO approach also outperforms the Fuzzy Logic and Cuckoo Search Algorithm (CSA) methods. These findings confirm that the integration of PSO and IBBC significantly improves both the accuracy and speed of MPP tracking in PEMFC systems.
STABILITY OF NON-SURFACTANT WATER AND HYDROGEN PEROXIDE EMULSIONS IN B0 AND B35 USING INLINE MIXER Muhammad Fariedz Irawan; Frendy Rian Saputro; Dhani Avianto Sugeng; Agus Mulyana; Kurnia Fajar Adhi Sukra; Fakhrul Afif Uzair; Wira Jazair Yahya; Rizqon Fajar; Boni Sena; Ujiburrahman Ujiburrahman
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i1.882

Abstract

Hydrogen peroxide (H2O2) enrichment is known to enhance combustion efficiency in diesel engines; however, its application as an emulsion is restricted by phase instability in the absence of chemical surfactants. This study investigates the stability and temperature characteristics of non-surfactant emulsions produced using an inline mixer known as the Real-Time Emulsion Supply System (RTES). Four emulsion types were formulated using water and aqueous H2O2 (5-15 vol%) as the dispersed phase, with neat diesel (B0) and biodiesel (B35) serving as the continuous phase: water-in-B0 (WD), H2O2-in-B0 (HD), water-in-B35 (WB), and H2O2-in-B35 (HB). The emulsions were prepared using RTES with a residence time of 180 s. During the preparation, the temperature was continuously recorded using a Graphtec GL840 data logger. The phase separation was monitored over 600 s using a Canon-EM3 camera. Results demonstrate that B35-based emulsions exhibit higher stability compared to B0-based emulsions. The stability tests showed distinct phase separation ratios for each formulation: 12.67% for WD, 10.67% for HD, 4.67% for WB, and 4.27% for HB. Meanwhile, the temperature rise (ΔT) varied slightly by formulation, ranging from 1.67-1.97 °C for WD and HD, and from 2.33-2.73 °C for WB and HB.
DAMPAK SUHU PIROLISIS TERHADAP KARBON AKTIF DARI BUNGA PINUS UNTUK MATERIAL PENDUKUNG KATALIS FUEL CELL Pebi Riyanto; Trisma Jaya Saputra; Rany Puspita Dewi; Sigit Mujiarto; Raka Mahendra Sulistiyo
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i1.868

Abstract

The high cost and limited durability of platinum-based catalysts remain major challenges for the large-scale commercialization of fuel cell. Therefore, alternative and more affordable catalyst support materials are needed. Biomass derived activated carbon offers a promising solution due to its porous structure, good electrical conductivity, and abundant raw material availability. This study aims to investigate the potential of Pinus merkusii pine cones as a precursor for activated carbon through pyrolysis and chemical activation using potassium hydroxide (KOH), as well as to evaluate its suitability as a fuel cell catalyst support material. Pyrolysis was conducted at temperatures of 400ºC, 600ºC, and 800ºC under a nitrogen inert atmosphere, followed by chemical activation. The resulting activated carbon was characterized using proximate analysis and Brunauer-Emmett-Teller (BET) analysis. The results indicate that increasing the pyrolysis temperature led to a reduction in biochar yield, moisture content, ash content, and volatile matter, while consistently enhancing the fixed carbon content and specific surface area. The optimal condition was achieved at a pyrolysis temperature of 800ºC, producing activated carbon with the highest fixed carbon content of 81.87%, a specific surface area of 42.83 m2/g, and a mesoporous structure with an average pore diameter of 3.23 nm. Nevertheless, the obtained specific surface area remains below the ideal value (>100 m²/g) for application as a fuel cell catalyst support, indicating that the synthesized material still requires further optimization in both the process and activation conditions.
MOLECULAR ADSORPTION OF ZEA MAYS LEAF PHYTOCHEMICALS ON Fe(110) AS CORROSION INHIBITORS: DFT AND MONTE CARLO STUDY Syarif Hidayatullah; Suteja Suteja
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

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

Abstract

Plant-derived compounds have attracted increasing attention as environmentally friendly corrosion inhibitor candidates. However, the molecular adsorption behavior of selected phytochemicals from Zea mays leaves on iron surfaces remains insufficiently understood. This study investigates ethyl palmitate (EP), hexadecanoic acid (HA), and 9,12,15-octadecatrienoic acid (OA), identified from Zea mays leaf extract, as potential inhibitors for the Fe(110) surface. Density Functional Theory (DFT) calculations at the B3LYP/6–311G(d,p) level were used to evaluate global and local electronic descriptors, including frontier molecular orbital energies, energy gap, dipole moment, hardness, softness, electronegativity, electron transfer tendency, Mulliken charge distribution, electrostatic potential, and Fukui indices. Monte Carlo simulations were performed to examine the adsorption behavior of these molecules on Fe(110) in the presence of water molecules. The DFT results showed that OA had the smallest energy gap and the highest softness, indicating the strongest electronic reactivity among the studied molecules. In contrast, EP exhibited the strongest adsorption affinity in the Monte Carlo simulation. The calculated differential adsorption energies for EP, OA, and HA were −203.32, −192.71, and −189.69 kcal/mol, respectively, indicating favorable adsorption on Fe(110). Oxygen-containing functional groups were identified as the main reactive sites involved in molecule–surface interactions. The main contribution of this work is the molecular-level comparison of selected Zea mays leaf phytochemicals on Fe(110) using combined DFT and Monte Carlo approaches. The results suggest that EP and OA are promising green corrosion inhibitor candidates, although experimental validation is required to confirm their inhibition efficiency under practical corrosive conditions.
EFFECT OF NaOH AND Ca(OH)₂ ALKALI TREATMENT TIME ON PURUN TIKUS FIBER PROPERTIES Akhmad Syarief; Valentino Krisna Mukti; Iphan Radam; Muhammad Nizar Ramadhan; Akhmad Ghifary Budianto; Fadlyannur Fadlyannur; Aulia Aufa Ramadasari; Rizqi Ilmal Yaqin
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i1.875

Abstract

Purun tikus fiber (Eleocharis dulcis) is a promising natural fiber for environmentally friendly composite reinforcement due to its abundant availability and relatively high cellulose content. However, the presence of lignin, hemicellulose, and surface impurities can reduce interfacial bonding and mechanical performance. This study investigated the effect of alkali treatment type and immersion time on the mechanical and morphological properties of single purun tikus fibers. The fibers were treated in 5 wt.% NaOH and Ca(OH)₂ solutions for 3, 6, and 9 h, with three specimens prepared for each treatment variation. Mechanical characterization included single-fiber tensile testing based on ASTM C1557 to determine tensile strength, strain, and elastic modulus, pull-out testing to evaluate interfacial shear strength, and field emission scanning electron microscopy (FESEM) analysis to observe surface morphology changes. The results showed that the the most favorable treatment condition was obtained using NaOH for 3 h. Under this condition, the interfacial shear strength increased from 2.858 MPa to 3.394 MPa, corresponding to an improvement of approximately 18.8%, while the tensile strength was maintained at 0.681 MPa, close to that of the untreated fiber (0.685 MPa). In contrast, longer immersion times of 6 and 9 h reduced the tensile strength and interfacial performance, indicating fiber degradation due to excessive alkalization. FESEM observations confirmed that short-duration alkali treatment improved surface cleanliness and roughness, whereas prolonged treatment caused cracks and structural damage. These findings indicate that controlled NaOH treatment is more effective than Ca(OH)₂ in improving the suitability of purun tikus fiber as a composite reinforcement.
THE EFFECTS OF ALUMINUM REFLECTOR SHAPES, ANGLES, AND THERMAL-LIGHT COVARIATION ON SOLAR PANEL PERFORMANCE Nur Zaini Khafid; Aqli Mursadin; Sopyan Ali Rohman
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 2 (2026): SJME Kinematika December 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i2.851

Abstract

The performance of solar panels is strongly influenced by light intensity, panel temperature, and incident angle, indicating the need for reflector-based enhancements to improve power output. This study aims to analyze the effects of aluminum reflector shapes and angles on solar panel output while evaluating the covariation effects of room temperature, panel temperature, and light intensity. Experiments were conducted indoors using a 200 W spotlight with three reflector configurations (none, flat, concave) and angles of 55°, 65°, 75°, and 85°. Data were analyzed using MANCOVA and correlation tests to determine significance across variables. Results indicate that both reflector shape and angle significantly affect current and voltage, with the flat reflector delivering the highest power output, especially at a 55° angle. Light intensity was found to be the dominant covariate increasing power, whereas panel and room temperatures showed negative correlations. These findings highlight the crucial role of optimized reflector design and thermal management in enhancing solar panel performance.
INVESTIGATION OF MECHANICAL PROPERTIES OF SLA 3D PRINTED RESIN IN BENDING MOMENT ANALYSIS USING FINITE ELEMENT METHOD Lita Asyriati Latif; Sukiman B; Mohammad Muzni Harbelubun; Mukhlis M; Kifli Umar; Kholqillah Ardhian Ilman
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 2 (2026): SJME Kinematika December 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i2.876

Abstract

This study investigates the mechanical properties of Stereolithography (SLA) 3D printed resin in bending moment analysis using the Finite Element Method (FEM). With the growing adoption of SLA in healthcare and manufacturing, understanding mechanical performance of SLA-printed components, particularly in bending, is crucial. The research evaluates influence of printing parameters and material composition on flexural strength and flexibility of dental resin samples. It examines internal geometries such as triangle and honeycomb structures and varying thickness-to-height ratios affecting bending strength. Bending tests followed ASTM D790 standards and results were compared with FEM simulations to validate material behavior. Simulations were performed using Abaqus Student 2025 software under conditions matching experimental tests. Results show geometry and thickness-to-height ratio significantly affect bending strength, with triangle geometry outperforming honeycomb. Samples with triangle geometry and 4.5 mm ratio achieved highest bending strength of 62.743 MPa, while honeycomb 9 mm reached 55.943 MPa. Post-processing such as UV curing improves mechanical properties of resin. This study provides insights for SLA 3D printing applications in dental prosthetics and offers a framework to optimize printing parameters for performance. It contributes to the development of predictive modeling combining FEM and experimental validation for improved design of additively manufactured resin components in biomedical applications. Future work will explore broader geometries, different resin formulations, and more complex loading conditions to enhance accuracy and reliability of simulation-based design methods for SLA printed structures in engineering and medical fields as well as improve clinical applicability in dental prosthetic fabrication processes and patient outcomes overall performance.
PENGARUH PENGGUNAAN GRAPHENE METAL FOAM TERHADAP KOEFISIEN PERPINDAHAN KALOR PADA SISTEM CLOSED-LOOP GEOTHERMAL Dinar Kurniawan; Indro Pranoto; Khasani; Budi Santoso Wibowo
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 2 (2026): SJME Kinematika December 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i2.899

Abstract

This study presents an experimental investigation into the effect of graphene metal foam on the heat-transfer performance of a closed-loop geothermal system. The system uses a sealed pipe configuration to circulate a low-temperature working fluid that extracts heat from the subsurface reservoir via conductive heat transfer and transports it to the surface. In this work, the system is modelled using a coaxial heat exchanger heated by an oven to simulate the geothermal reservoir. Two structural specifications of graphene-coated Ni-Fe alloy foam, 85% (90 PPI) and 90% (110 PPI), were employed and tested at a constant flow rate of 0.3 LPM under varying heat source temperatures of 170, 200, and 230 °C. The results show that both foam configurations achieved their highest performance at 230 °C. The overall heat transfer coefficient () reached 749.48 W/m².K for 85% (90 PPI) porosity and 462.78 W/m².K for 90% (110 PPI) porosity, significantly higher than that of a plain tube (103.88 W/m².K). These findings demonstrate that incorporating graphene metal foam, particularly at 85% porosity, effectively enhances heat-transfer performance in closed-loop geothermal systems.
STUDI EKSPERIMENTAL PERFORMA IMMERSION COOLING SATU FASE UNTUK PENDINGINAN BATERAI LITHIUM-ION DENGAN FLUIDA KERJA DIELEKTRIK Ivan Ardiansyah; Indro Pranoto
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 2 (2026): SJME Kinematika December 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i2.900

Abstract

This study experimentally investigates the thermal performance of static immersion cooling for cylindrical lithium-ion batteries using a hydrocarbon-based dielectric fluid (Shell S3 X). Natural convection (NC) and static immersion cooling were compared for two battery variants at a 3C discharge rate up to 80% depth of discharge. Results demonstrate that static immersion cooling consistently outperforms natural convection. Specifically, IC reduced the average and maximum surface temperatures by up to 11.50% and 11.93%, respectively. Furthermore, thermal uniformity improved significantly, with the maximum surface temperature difference decreasing from 3.2°C to 1.6°C for Battery A, and from 7.4°C to 5.0°C for Battery B. Energy-balance analysis confirmed a reduction in residual battery heat by up to 10.03%, accompanied by an enhanced apparent heat-transfer coefficient. These findings establish that passive immersion cooling using Shell S3 X effectively suppresses temperature rise and improves thermal uniformity, offering a promising solution for battery thermal management.
PENINGKATAN EFISIENSI PHOTOVOLTAIC MENGGUNAKAN LIQUID COOLING SERPENTINE DENGAN VARIASI LAJU ALIRAN PADA IKLIM TROPIS Bintang Arif Prasetya; Indro Pranoto; Fauzun
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 2 (2026): SJME Kinematika December 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i2.909

Abstract

Global growth in electricity demand and the environmental impact of fossil fuels have accelerated the adoption of photovoltaic (PV) technology. However, PV efficiency significantly degrades under high outdoor thermal loads, where every 1°C rise in temperature reduces efficiency by approximately 0.3-0.5%. This study evaluates an active thermal management system (TMS) based on a serpentine liquid channel integrated with a dual-axis solar tracker on a 100 Wp monocrystalline PV module. Outdoor experimental research was conducted at Universitas Gadjah Mada in April 2026. Water flow rates of 1.5 LPM and 2.5 LPM were analyzed to determine their impact on performance. To ensure a fair comparative evaluation under dynamic weather conditions, cooling performance was evaluated against an analytical non-cooled baseline calculated using standard STC coefficients driven by real-time environmental data. The results demonstrate that the TMS significantly lowered cell temperatures. At 1.5 LPM, the average temperature reduction was 12.43°C, while 2.5 LPM achieved a better reduction of 14.58°C. The heat transfer coefficient increased by 43.1%, rising from 322.77 W/m²K at 1.5 LPM to 461.89 W/m²K at 2.5 LPM. Consequently, average gross electrical efficiency improved from a non-cooled of 14.69% to 15.63% at 2.5 LPM, representing a 6.4% relative increase. While the 2.5 LPM flow rate achieved the better gross electrical efficiency, the 1.5 LPM configuration yielded slightly better net efficiency after accounting for the pump load. These findings confirm that increasing water flow rates within serpentine channels effectively maintains the PV temperature and improves its gross efficiency.

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