IJOMEST : International Journal of Mechanical Engineering Science and Technology
The International Journal of Mechanical Engineering Science and Technology (IJOMEST) is a peer-reviewed, open-access scientific journal published by the Asosiasi Diseminasi Rekayasa dan Inovasi Teknologi (ADRIT), Indonesia. The journal serves as a platform for researchers, academics, engineers, and practitioners to share original contributions in the field of mechanical engineering and related disciplines. All manuscripts are published in English and issued three times per year, in January, May, and September. IJOMEST welcomes original research articles, review articles, and technical papers that advance knowledge in mechanical engineering and smart technology. The scope of the journal covers, but is not limited to, the following areas: • Manufacturing Engineering: machining processes, CNC technology, additive manufacturing, precision engineering, and production systems • Materials Engineering: mechanical properties of materials, composite materials, material characterization, heat treatment, and failure analysis • Energy Systems and Thermal Engineering: heat transfer, thermodynamics, renewable energy, solar energy, biomass energy, drying technology, and energy efficiency • Fluid Mechanics and Hydraulics: computational fluid dynamics (CFD), flow analysis, hydraulic systems, and pneumatic systems • Design and Structural Engineering: machine design, stress analysis, finite element analysis (FEA), structural integrity, and fatigue • Mechatronics and Automation: robotics, control systems, sensors and actuators, and industrial automation • Smart Technology and Industry 4.0: Internet of Things (IoT) in manufacturing, artificial intelligence applications in engineering, digital twin technology, and smart manufacturing • Maintenance and Reliability Engineering: condition monitoring, predictive maintenance, vibration analysis, and failure mode analysis • Environmental and Sustainable Engineering: green manufacturing, lifecycle assessment, emission reduction, and sustainable energy systems
Articles
10 Documents
<![CDATA[Thermal Effects on Drying Performance, Kinetics, and Quality Characteristics of Paddy ]]>
<![CDATA[M Yahya]]>;
<![CDATA[Zido Yuwazama]]>;
<![CDATA[Dedi Wardianto]]>;
<![CDATA[Arfidian Rachman]]>;
<![CDATA[Ismet Eka Putra]]>;
<![CDATA[Putra Andi Kolala]]>
<![CDATA[ International Journal of Mechanical Engineering Science and Technology Vol. 1 No. 1 (2026): IJOMEST: International Journal of Mechanical Engineering Science and Technology ]]>
Publisher : <![CDATA[Asosiasi Diseminasi Rekayasa Dan Inovasi Teknologi ]]>
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DOI: 10.67795/ijomest.v1i1.2
<![CDATA[A solar hybrid continuous dryer (SHCD) was developed to overcome the limitations of conventional solar batch drying systems for paddy. This study investigates the thermal effects on drying performance, drying kinetics, and quality characteristics of paddy at different drying air temperatures. Drying experiments were conducted at average air temperatures of 49.7 °C (Exp 1), 60.0 °C (Exp 2), and 69.6 °C (Exp 3). The results indicate that the SHCD at an air temperature drying of 60.0 °C provides the optimal balance between drying performance, energy efficiency, and product quality. At this temperature, the drying time was significantly reduced, accompanied by higher thermal efficiency and superior rice quality compared to other conditions. In contrast, drying at 49.7 °C resulted in prolonged drying time, whereas drying at 69.6 °C led to reduced thermal efficiency and deterioration in product quality. Moreover, the SHCD at 60.0 °C reduced the paddy mass from 420 kg (16.80% wet basis) to 407.63 kg (14.17% wet basis) within 165.4 min. The average drying rate, specific moisture extraction rate (SMER), and specific energy consumption (SEC) were 2.849 kg/h, 0.125 kg/kWh, and 15.649 kWh/kg, respectively, with a maximum thermal efficiency of 17.14%. Quality analysis showed that the percentages of head rice, broken rice, and rice groats were 85.60 ± 0.65%, 8.73 ± 1.98%, and 4.92 ± 1.67%, respectively. Furthermore, the drying kinetics analysis revealed that the moisture ratio (MR) data were best described by the Page model, indicating its suitability for predicting paddy drying behavior in the SHCD system. These findings present that temperature optimization plays a critical role in enhancing drying efficiency and maintaining product quality in continuous solar drying systems.]]>
<![CDATA[Development of a Low-Alloy Steel Stress-Strain Curve Simulation Model Using the Ramberg-Osgood Approach ]]>
<![CDATA[Yuda Perdana Kusuma]]>;
<![CDATA[Nasrullah Nasrullah]]>;
<![CDATA[Hooi Peng Lim]]>;
<![CDATA[Muchlisinalahuddin Muchlisinalahuddin]]>;
<![CDATA[Muhammad Rabiu Abbas]]>
<![CDATA[ International Journal of Mechanical Engineering Science and Technology Vol. 1 No. 1 (2026): IJOMEST: International Journal of Mechanical Engineering Science and Technology ]]>
Publisher : <![CDATA[Asosiasi Diseminasi Rekayasa Dan Inovasi Teknologi ]]>
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DOI: 10.67795/ijomest.v1i1.15
<![CDATA[The stress-strain curve is essential information in the analysis of material mechanical behavior; however, obtaining the curve directly requires specialized testing that is not always available. On the other hand, standard tensile test parameters such as yield strength, tensile strength, elongation, and reduction in area are commonly available from routine material testing. This study addresses this condition by developing a low-alloy steel stress-strain curve simulation model based on the Ramberg-Osgood equation using these four mechanical parameters as the primary inputs. The main parameter in this model is the strain hardening exponent (n), which is calculated directly from the available mechanical data. The calculated n values ranged from 1.992 to 38.211, with an average value of 14.17, which is consistent with the general characteristics of low-alloy steels. The simulated curves exhibited profiles consistent with the behavior of ductile metals, where each specimen produced different plastic deformation characteristics according to its respective mechanical properties. Internal validation demonstrated that the simulated curves showed complete agreement with the mechanical input parameters, without deviation across all analyzed samples. The results indicate that low-alloy steel stress-strain curves can be accurately reconstructed using only conventional tensile test data. Therefore, the developed model has the potential to serve as a practical solution for generating stress-strain curves when complete experimental curve data are unavailable but required for further engineering analysis.]]>
<![CDATA[Analysis of the Effect of Fused Deposition Modeling Process Parameters on the Tensile Strength of PLA Material ]]>
<![CDATA[Desmarita Leni]]>;
<![CDATA[Yazmendra Rosa]]>;
<![CDATA[Eka Sunitra]]>;
<![CDATA[Riza Muharni]]>;
<![CDATA[Yuanda Perdana Kusuma]]>
<![CDATA[ International Journal of Mechanical Engineering Science and Technology Vol. 1 No. 1 (2026): IJOMEST: International Journal of Mechanical Engineering Science and Technology ]]>
Publisher : <![CDATA[Asosiasi Diseminasi Rekayasa Dan Inovasi Teknologi ]]>
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DOI: 10.67795/ijomest.v1i1.16
<![CDATA[Variations in process parameters in Fused Deposition Modeling (FDM) often lead to differences in the tensile strength of Polylactic Acid (PLA) materials. However, results reported in previous studies remain inconsistent and difficult to compare directly. This condition makes it challenging to identify which parameters have a truly significant effect on tensile strength. This study aims to analyze the influence of FDM process parameters on the tensile strength of PLA materials using secondary data consisting of 74 observations, which were organized into a structured dataset and analyzed using descriptive statistics and correlation analysis. The results show that print orientation has the strongest negative correlation, with a value of −0.51, indicating that an increase in print orientation is associated with a decrease in tensile strength. Layer height also shows a negative correlation of −0.38, where smaller layer thickness is associated with higher tensile strength. Nozzle temperature exhibits a positive correlation of 0.35, while print speed does not show a significant effect on ultimate tensile strength (UTS). This approach enables a faster and more systematic identification of the most influential parameters compared to reviewing individual studies separately. Therefore, this study provides a clearer understanding of parameter prioritization in the FDM process, which can support more efficient decision-making to improve the tensile strength of PLA materials.]]>
<![CDATA[Design of a Mini Injection Molding Machine and Injection Analysis of Products Using CAE Software ]]>
<![CDATA[Nurul Dwi Rahma]]>;
<![CDATA[Aidil Zamri]]>;
<![CDATA[Mulyadi Mulyadi]]>;
<![CDATA[Yuliarman Yuliarman]]>
<![CDATA[ International Journal of Mechanical Engineering Science and Technology Vol. 1 No. 1 (2026): IJOMEST: International Journal of Mechanical Engineering Science and Technology ]]>
Publisher : <![CDATA[Asosiasi Diseminasi Rekayasa Dan Inovasi Teknologi ]]>
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DOI: 10.67795/ijomest.v1i1.17
<![CDATA[The increasing amount of HDPE (High-Density Polyethylene) plastic waste requires more efficient and economical processing technologies, particularly for small-and medium-scale applications. This study aims to design a mini injection molding machine for processing HDPE plastic waste and to analyze the product injection process using Computer-Aided Engineering (CAE)-based software. The machine was designed using SolidWorks, focusing on the injection system, clamping system, and heating system. The injection process was analyzed using SolidWorks Plastics with variations in gate position and melt temperature to evaluate injection pressure, material flow distribution, and product defects. The results show that the designed machine is capable of producing a stable HDPE injection process using a screw with an L/D ratio of 20:1 and a ball screw-based clamping system. Simulation results indicate that a gate position located at the center of the product provides the best flow distribution with minimal weldline defects. The optimum melt temperature was found to be 240°C, with an injection pressure of approximately 10 MPa. These findings indicate that the integration of mini injection molding technology and CAE-based analysis has the potential to support more efficient plastic recycling processes while minimizing design revisions, material waste, and manufacturing costs in small-scale production systems]]>
<![CDATA[Numerical Analysis of Pressure and Velocity Distribution on NACA 0012 Airfoil Using Two CFD Computational Domains ]]>
<![CDATA[Yuni Vadila]]>;
<![CDATA[Rayhan Stevano]]>;
<![CDATA[Randi Pernama Putra]]>
<![CDATA[ International Journal of Mechanical Engineering Science and Technology Vol. 1 No. 1 (2026): IJOMEST: International Journal of Mechanical Engineering Science and Technology ]]>
Publisher : <![CDATA[Asosiasi Diseminasi Rekayasa Dan Inovasi Teknologi ]]>
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DOI: 10.67795/ijomest.v1i1.18
<![CDATA[The NACA 0012 airfoil is widely applied in aeronautics, wind turbines, and unmanned aerial vehicles (UAVs). This study investigates the pressure and velocity distributions on a NACA 0012 airfoil at a 5° angle of attack using two computational domain configurations in Computational Fluid Dynamics (CFD): a block domain and a tilted-airfoil domain. Simulations were conducted in OpenFOAM using a steady-state incompressible solver with the k-ω SST turbulence model and SIMPLE algorithm at an inlet velocity of 16 m/s (Re ≈ 1.1×10⁶). The computational mesh consisted of 482,700 cells and 157,100 nodes. Validation against experimental and numerical references showed good agreement, with pressure coefficient deviations below 5%. The results indicate a significant negative pressure gradient on the upper airfoil surface, maximum velocity reaching 16.15 m/s, and the presence of wake asymmetry and initial flow separation near the trailing edge. Differences in turbulent kinetic energy between the two configurations demonstrate that domain setup significantly influences turbulence development and aerodynamic prediction accuracy. This study highlights the sensitivity of CFD simulations to computational domain configuration in airfoil aerodynamic analysis.]]>
<![CDATA[Corrosion Behavior of Ti-12Cr and Commercially Pure Titanium (CpTi) in AFNOR Artificial Saliva at 37°C ]]>
<![CDATA[Aguswan Amirul Arif]]>;
<![CDATA[Gunawarman Gunawarman]]>;
<![CDATA[Jon Affi]]>
<![CDATA[ International Journal of Mechanical Engineering Science and Technology Vol. 1 No. 2 (2026): IJOMEST: International Journal of Mechanical Engineering Science and Technology ]]>
Publisher : <![CDATA[Asosiasi Diseminasi Rekayasa Dan Inovasi Teknologi ]]>
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DOI: 10.67795/ijomest.v1i2.22
<![CDATA[Metallic materials for orthodontic applications must exhibit good corrosion resistance, as they operate within the corrosive environment of the oral cavity. Titanium and its alloys are widely used as biomaterials owing to their favorable biocompatibility and corrosion resistance. This study aimed to evaluate the corrosion behavior of Ti-12Cr alloy under three heat-treatment conditions, namely solution treated (ST), aged for 30 ks (AT 30 ks), and aged for 60 ks (AT 60 ks), and to compare it with commercially pure titanium (CpTi) in AFNOR artificial saliva at 37°C. Corrosion testing was performed using the weight-loss method with immersion periods of 1, 2, and 3 weeks, using one specimen for each condition. Surface characterization was conducted using Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDX), while the mechanical properties were evaluated through Vickers hardness testing before and after immersion. The results showed that all materials experienced weight loss during immersion. Ti-12Cr AT 60 ks exhibited the lowest average corrosion rate at 3.88 × 10⁻⁶ mmpy, followed by Ti-12Cr AT 30 ks at 4.18 × 10⁻⁶ mmpy and Ti-12Cr ST at 5.00 × 10⁻⁶ mmpy, whereas CpTi showed the highest corrosion rate at 7.70 × 10⁻⁶ mmpy. Hardness testing revealed a decline in hardness values for all materials during immersion, with Ti-12Cr AT 30 ks maintaining the highest hardness throughout the observation period. The findings indicate that Ti-12Cr possesses better corrosion resistance than CpTi, and that increasing the aging time from 30 ks to 60 ks resulted in a further reduction in the average corrosion rate. The Ti-12Cr AT 60 ks condition yielded the highest corrosion resistance, whereas Ti-12Cr AT 30 ks retained the highest hardness after immersion. These results reveal a divergence between the corrosion resistance and hardness responses to heat treatment. Overall, Ti-12Cr demonstrates potential as a nickel-free.]]>
<![CDATA[Troubleshooting Analysis of the Cooling System in an Overheating Honda Jazz i-DSI Engine: A Case Study ]]>
<![CDATA[Andriyanto Andriyanto]]>;
<![CDATA[Rudy Chandra]]>;
<![CDATA[Fikri Arya Alhamdi]]>;
<![CDATA[Khairul Amri]]>;
<![CDATA[Hanif Hanif]]>;
<![CDATA[Akmal Indra]]>
<![CDATA[ International Journal of Mechanical Engineering Science and Technology Vol. 1 No. 2 (2026): IJOMEST: International Journal of Mechanical Engineering Science and Technology ]]>
Publisher : <![CDATA[Asosiasi Diseminasi Rekayasa Dan Inovasi Teknologi ]]>
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DOI: 10.67795/ijomest.v1i2.23
<![CDATA[This study analyzes the troubleshooting process of an overheating cooling system in a single Honda Jazz i-DSI engine used as a practical training unit at the Heavy Equipment Engineering Workshop, Politeknik Negeri Padang. A case study approach with descriptive analysis was applied through identification of overheating symptoms, inspection of cooling system components, functional testing, examination of coolant hose configuration, repair, and temperature verification. The inspection showed no blockage in the radiator, the V-belt met the inspection criteria, the thermostat opened at 80°C and fully opened at 95°C, and no mechanical damage was found in the water pump. The coolant level was low, while radiator cap pressure performance and temperature sensor accuracy were not quantitatively verified. Further inspection identified reversed inlet and outlet radiator hose installation. After correcting the hose configuration and refilling the coolant, the maximum coolant temperature decreased from 116.25°C to 95°C and subsequently decreased to 85°C. The findings indicate that incorrect hose configuration was associated with overheating in the investigated case.]]>
<![CDATA[Development of Chitosan-Based Graphene Hydrogel for EfficientSolar Evaporation ]]>
<![CDATA[Hooi Peng Lim]]>;
<![CDATA[Limi Chong]]>;
<![CDATA[Ida Rosmanizan Abdullah]]>
<![CDATA[ International Journal of Mechanical Engineering Science and Technology Vol. 1 No. 2 (2026): IJOMEST: International Journal of Mechanical Engineering Science and Technology ]]>
Publisher : <![CDATA[Asosiasi Diseminasi Rekayasa Dan Inovasi Teknologi ]]>
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DOI: 10.67795/ijomest.v1i2.25
<![CDATA[This study aims to evaluate the effectiveness of developing a chitosan-derived graphene hydrogel for a solar evaporation system. The hydrogel was prepared in two types, i.e. flat-surface and hemispherical-surface hydrogels. The system consisted of a chitosan-derived embedded graphene hydrogel, a cotton wipe, and a thermal insulator. The system was then tested using a solar simulator to investigate the effect of varying irradiation times from 1 to 12 hours. The morphology of the hydrogel was characterised using an inverted microscope before and after irradiation for 1 and 12 hours, respectively. The experimental test includes temperature distribution and water mass loss for the samples before and after irradiation for 1 and 12 hours. The resultant findings provide useful data on the evaporation system efficiency under the simulated conditions. It was reported that the hemispherical-surface hydrogel reached a lower temperature distribution of 52 °C than the flat-surface hydrogel at 57 °C. The water mass loss of the hemispherical-surface hydrogel is as low as -1.22 g, indicating a higher evaporation rate of 0.09205 kgm−2 h−1 than the flat-surface hydrogel of -1.48 g and 0.04568 kgm−2 h−1, respectively. This study reveals that a lower total water mass loss can occur alongside a higher evaporation rate when the surface area exposed to air is very small, as in a hemispherical-surface hydrogel.]]>
<![CDATA[Experimental Assessment of Cooling Performance of a Portable Solar-Powered Thermoelectric Cooler ]]>
<![CDATA[Limi Chong]]>;
<![CDATA[Ida Rosmanizan Abdullah]]>;
<![CDATA[Hooi Peng Lim]]>
<![CDATA[ International Journal of Mechanical Engineering Science and Technology Vol. 1 No. 2 (2026): IJOMEST: International Journal of Mechanical Engineering Science and Technology ]]>
Publisher : <![CDATA[Asosiasi Diseminasi Rekayasa Dan Inovasi Teknologi ]]>
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DOI: 10.67795/ijomest.v1i2.26
<![CDATA[Portable cooling systems powered by renewable energy are of interest for outdoor applications where conventional refrigeration is inconvenient. This study experimentally assesses the practical cooling performance of a portable solar-powered thermoelectric cooler based on cooling time and sustained cooling duration. The prototype has external dimensions of 400 mm × 400 mm × 350 mm and was designed for a nominal temperature range of 10–20 °C using a 100 W solar energy source. Cooling performance was evaluated using food and beverage loads and compared with a common cooler box. Three recorded trials were used for each load category. The portable solar cooler required an average of 85 min to cool the food samples and 34 min for drinks, whereas the common cooler required 60 min and 25 min, respectively. Although the prototype exhibited a slower pull-down time, its cooling duration was approximately 8 h compared with 3 h for the common cooler box. The results, therefore, indicate a trade-off between initial cooling rate and sustained temperature holding. The study contributes an experimentally based performance assessment of a low-cost solar-assisted thermoelectric cooling configuration and identifies thermal insulation, heat rejection and enclosure sealing as key areas for further improvement.]]>
<![CDATA[Effect of Fillet Radius at the Shank-to-Body Transition on the Local and Global Structural Responses of a Lifting Hook ]]>
<![CDATA[Adriansyah Adriansyah]]>;
<![CDATA[Khaidir Khaidir]]>;
<![CDATA[Muhammad Riza]]>;
<![CDATA[Chiena L. Palconite]]>;
<![CDATA[Risal Abu]]>
<![CDATA[ International Journal of Mechanical Engineering Science and Technology Vol. 1 No. 2 (2026): IJOMEST: International Journal of Mechanical Engineering Science and Technology ]]>
Publisher : <![CDATA[Asosiasi Diseminasi Rekayasa Dan Inovasi Teknologi ]]>
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DOI: 10.67795/ijomest.v1i2.29
<![CDATA[Geometric modifications of lifting hooks are generally evaluated based on changes in stress at the modified region; however, a reduction in local stress does not necessarily produce a corresponding change in the global response of the hook. This study evaluates the effect of fillet radius at the transition between the shank and hook body on the local and global structural responses. Four fillet radii, namely 5, 10, 15, and 20 mm, were analyzed using the finite element method in ANSYS Static Structural with AISI 1045 Hot Rolled steel under a static load of 49,050 N. The reliability of the model was evaluated through mesh convergence analysis and comparison with an analytical stress concentration factor approach. The results show that increasing the fillet radius from 5 to 15 mm reduced the local stress at the fillet by 15.59%, from 68.49 MPa to 57.81 MPa, whereas a further increase to 20 mm did not produce an additional reduction. In contrast, the maximum global stress occurring at the inner bowl surface changed by only 0.25%, from 138.15 to 138.49 MPa, resulting in a relatively constant factor of safety in the range of 2.383–2.389. The maximum deformation also changed by only 0.69% across the range of fillet radii. These results indicate that the fillet radius has a more pronounced effect on the local stress response than on the global structural response. Therefore, a reduction in stress at the fillet region alone is insufficient to demonstrate an improvement in the overall strength of the lifting hook, particularly when the modified region is not the location of maximum stress. Evaluation of geometric modifications in lifting hooks should therefore consider the location of critical regions and distinguish between local and global structural responses.]]>
