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SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin
Published by Universitas Muhammadiyah Jakarta
ISSN : 20889038     EISSN : 25499645     DOI : -
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin is an open access, peer-review journal which publishes original and review articles that advance the understanding of both the fundamentals of engineering science and its application to the solution of challenges and problems in mechanical engineering systems, machines and components. The editorial team aims to publish high quality and highly applied research and innovation that has the potential to be widely disseminated, taking into consideration the potential mechanical engineering that it could generate.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 295 Documents
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Acoustic Analysis of 3D Printing Motion Patterns for Machine Condition Monitoring Mahmud Mahmud; M. Dirhamsyah; Muhammad Rizal; Hamdani Hamdani; Azwar Azwar; Sariyusda Sariyusda; Zulfadli Zulfadli
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 19 No. 2 (2025): SINTEK JURNAL
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.19.2.113-131

Abstract

In additive manufacturing, mechanical vibrations generated during the printing process produce characteristic acoustic emissions, which are directly influenced by toolpath kinematics. These vibrations can adversely affect dimensional accuracy and interlayer adhesion, underscoring the need for effective process monitoring. This study investigates the correlation between specific toolpath geometries and their acoustic signatures in a Fused Deposition Modeling (FDM) 3D printer to establish a foundation for non-invasive condition monitoring. Five fundamental motion patterns—diagonal (Quadrants I-III and II-IV), horizontal, cylindrical, and vertical—were fabricated in an anechoic chamber. Acoustic emissions were captured via two microphones positioned 5 cm from the printer and analyzed in the time domain using statistical features: Root Mean Square (RMS), Kurtosis, and Crest Factor. The measured sound pressure levels ranged from 0.5 Pa to 1.5 Pa. Results indicate that the vertical toolpath yielded the lowest RMS (0.0863) and Crest Factor (5.38) values, reflecting the least intense and most stable acoustic emission. Conversely, diagonal patterns exhibited significantly higher values, denoting greater vibrational energy and transient fluctuations. These findings demonstrate a definitive influence of motion geometry on a printer's acoustic signature. The vertical pattern is identified as the most stable under the tested parameters. This research confirms that time-domain acoustic analysis is a viable technique for characterizing machine performance. Establishing this baseline correlation enables the future development of real-time, sound-based monitoring systems capable of predicting print defects and facilitating predictive maintenance, thereby enhancing the reliability and quality of additive manufacturing processes.
Material Selection for Fatigue Resistance in Coal Screening Systems: Finite Element Analysis of HB400 and GS20Mn5 at PT Bukit Asam Tarahan Port Kiagus A Hadi; Anung Suwito
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 19 No. 1 (2025): SINTEK JURNAL
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.19.1.25-41

Abstract

Fatigue failure due to impact loads on the CV507 screen coal flow breaker plate has caused operational constraints that hamper coal production at PT. Bukit Asam – Tarahan Harbor. This research aims to determine the optimal material selection for coal flow breaker plates to achieve superior fatigue life and operational safety. HB400 material was selected for its high hardness and wear resistance, suitable for applications experiencing friction and direct coal impact. GS20Mn5 was chosen for its high toughness and superior impact energy absorption capabilities without cracking, particularly under repeated impact loading conditions. Two materials, Hardock (HB400) and GS20Mn5, with thicknesses of 15 mm and 20 mm respectively, were analyzed using static structural and explicit dynamic analysis in ANSYS Workbench 2022 R1 software. Simulation results indicate that the maximum operational impact load is 15.2 kN. The highest maximum Von Mises stress occurred in the Hardock (HB400) material with 15 mm thickness at 2348.3 MPa, with total deformation of 12.139 mm. Increasing thickness by 5 mm in the Hardock (HB400) material reduced stress and total deformation to 1543.3 MPa and 11.476 mm, respectively. GS20Mn5 material with 20 mm thickness demonstrated the longest fatigue life of 8 months compared to Hardock (HB400). This research provides material selection guidelines for coal flow breaker plates, offering significant value for engineering applications and the mining industry.
Effect of Carbon Nanotube Concentration on Thermal and Latent Heat Properties of Soy Wax-Based Composites Bagus Irawan; Arijanto Arijanto; Dini Cahyandari; Muhammad Subri; Gery Salsabil; Febiyanto Febiyanto
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 19 No. 1 (2025): SINTEK JURNAL
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.19.1.51-60

Abstract

Phase Change Materials (PCMs) absorb and release thermal energy during phase transitions, making them valuable for applications such as temperature regulation, energy storage, and passive heating or cooling systems. Soy wax, a natural PCM, is an attractive candidate due to its abundance and biodegradability; however, its low thermal conductivity limits its efficiency in energy storage applications. To address this limitation, this study investigates the incorporation of carbon nanotubes (CNTs) into a soy wax matrix to enhance thermal performance. Soy wax-CNT composites were synthesized using a melt-mixing method, with CNTs dispersed at varying concentrations (0.5%, 1%, and 3% by weight). Differential Scanning Calorimetry (DSC) was employed to analyze phase transition characteristics. The results demonstrate that the addition of CNTs significantly improved the thermal conductivity of soy wax, increasing from 0.21 W/m·K (pure soy wax) to 0.36 W/m·K at 0.5% CNT loading, representing a 71% enhancement. The latent heat of fusion peaked at 22.00 J/g at this optimal CNT concentration, indicating improved energy storage capacity. Furthermore, thermal cycling tests confirmed enhanced stability, with minimal degradation after multiple heating and cooling cycles. These findings highlight the potential of soy wax-CNT composites as improved PCMs for thermal energy storage applications, offering enhanced conductivity, higher latent heat, and improved thermal cycle durability.
Comparative Study of Experimental Testing and Finite Element Simulation of Hexagonal Crash Boxes Made from AA 6061-T4 Ahmad Yunus Nasution; Dodi Peradile; Togu Martua Siregar; Riki Effendi; Gunawan Hidayat
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 19 No. 2 (2025): SINTEK JURNAL
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.19.2.144-152

Abstract

This study evaluates the crashworthiness of hexagonal AA 6061-T4 crash boxes with perforations by integrating experimental compression tests and finite element (FEM) simulations. The research aims to analyze the influence of perforation patterns (one, two, and three holes) on energy absorption and deformation behavior. Simulation results using ABAQUS CAE 6.14 show strong agreement with experimental data, with discrepancies of less than 5% in peak force and energy absorption. The validated model confirms the effectiveness of perforated hexagonal designs in improving energy absorption while reducing peak reaction forces. These findings provide validated design insights for optimizing lightweight crash boxes and enhancing passive safety systems in automotive engineering.
Performance Comparison of DSSCs Using Butterfly Pea Flower Extract With Iodine and Peat Water Electrolytes Gundiawan Gundiawan; Eko Julianto; Muhammad Iwan; Eko Sarwono; Dini Hardiarti
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 20 No. 1 (2026): SINTEK JURNAL (In Progress)
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.20.1.1-17

Abstract

The demand for energy in Indonesia continues to increase due to infrastructure development, regional expansion, and highway construction. Solar panels convert solar photon energy into electrical energy and must be exposed to direct sunlight. Dye-sensitized solar cells (DSSC) are a type of solar cell that utilizes photoelectrochemical principles. This study compares the performance of DSSCs using iodine-based electrolytes and peat water electrolytes. The experimental method was conducted directly in the laboratory to test the composition of peat water-based electrolyte with the performance of DSSCs. Extraction of the natural dye from butterfly pea flowers and ethanol at a ratio of 1:10 was soaked for three days in a container covered with plastic at room temperature, producing a wavelength of 410 nm. The test results show that the DSSC with iodine electrolyte achieved an efficiency of 1.42%, which is higher than that of the peat water-based electrolyte, which produced an efficiency of 0.38%. In addition, the maximum power (Pmax) produced by the iodine electrolyte reached 0.0720 W, while peat water produced only 0.0189 W. The test results also indicate that peat water electrolyte has the potential to produce considerable voltage and power at certain times, but its stability is lower than that of iodine electrolyte, which showed more consistent performance.
Effect of Alkali Treatment Duration on Tensile and Flexural Properties of Pineapple Fiber Composites (Ananas comosus) Ricky Kurniawan; Edi Widodo; Ali Akbar; Mulyadi Mulyadi; Sulis Yulianto; Dewi Sartika
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 19 No. 2 (2025): SINTEK JURNAL
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.19.2.164-180

Abstract

Pineapple leaf fiber is a natural fiber with high cellulose content, making it a promising reinforcement for polymer composites. This study introduces novelty by systematically analyzing the effect of varying 5% NaOH alkali soaking durations (2, 4, 8, 16, and 24 hours) on the tensile and flexural properties of unidirectional pineapple fiber-reinforced polyester composites a range and comprehensive comparison not extensively explored previously. Composites with a 30% fiber volume fraction were fabricated using the hand lay-up method. Tensile and three-point bending tests were conducted according to ASTM D638 and D790, respectively. Results indicated that a 24-hour alkali treatment yielded the highest tensile strength of 44.82 MPa with a strain of 0.1080%, suggesting optimal fiber-matrix adhesion. Conversely, the highest flexural strength of 122 MPa and a modulus of 14,616 MPa were achieved after 16 hours of soaking. Therefore, the optimal alkali treatment duration depends on the targeted mechanical property: 24 hours for maximum tensile strength and 16 hours for optimal flexural performance. These findings aid in enhancing the mechanical properties of pineapple fiber composites through controlled alkali treatment, with potential applications in lightweight automotive panels, interior components, and sustainable construction materials where a balance between tensile and flexural properties is crucial.
Impact of MgO Nanofluid Concentration on Thermal and Electrical Efficiency of PV/T Systems: A CFD and Experimental Study Bryan Amrizha; Avita Ayu Permanasari
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 19 No. 1 (2025): SINTEK JURNAL
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.19.1.61-71

Abstract

This study investigates the effect of Magnesium Oxide (MgO) nanofluid concentration on the thermal and electrical efficiency of photovoltaic thermal (PV/T) systems using both experimental characterization and Computational Fluid Dynamics (CFD) simulation. Inlet flow rates (0.5–2.5 L/min) and MgO volume fractions (0.08%–0.4%) were varied. Experimental results confirm nanofluid stability for over 15 days at concentrations up to 0.2 vol%. CFD simulations using ANSYS Fluent reveal that the highest collector thermal efficiency of 69.1% is achieved at 0.2 vol% and 1.5 L/min, which is 16.7% higher than when using distilled water (DW) or ethylene glycol (EG) alone. The absorbed energy factor increases by 16.74%, while heat loss decreases by 52.2%. These findings highlight the significant performance gains attainable through optimized MgO nanofluid use in PV/T systems.
Analysis of Metal Contaminants and Wear in Lubricating Oil of Two-Stroke Diesel Engines Based on ASTM Testing Standards Mustopa Kamal; Ade Hermawan; Achmad Syarifudin; I Ketut Daging; M Yusuf Yusuf Syam; Raedy Anwar S; Angga Putra Jaya
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 19 No. 1 (2025): SINTEK JURNAL
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.19.1.72-81

Abstract

Common issues in diesel engines include lubricating oil contamination and metal wear, which significantly degrade oil quality. This study analyzes contamination and metal wear in the lubricating oil of a two-stroke diesel engine using American Standard Testing and Material (ASTM) methods. Data were obtained from 130 mL lubricating oil samples taken from a main engine and tested according to ASTM standards. The observed variables included independent factors (contamination and metal wear levels) and the dependent variable (lubricating oil quality), all analyzed in a laboratory. Testing methods comprised ASTM D445-21e2/ASTM D2896-21 (Cannon CT-500 Series II viscometer), ASTM D5185-18 (ICP-OES 5100 VDC spectrometer), and ASTM E2412-18 (Thermo Scientific Nicolet FTIR spectrometer), conducted at PT Petrolab Services Laboratory. Results from oil samples used for 7,744.5 and 10,576.5 operational hours indicated the presence of sodium (Na) and silicon (Si), suggesting a coolant leak containing salt. Furthermore, component friction generated significant wear metal particles—iron (Fe), copper (Cu), aluminum (Al), lead (Pb), and chromium (Cr)—which were trapped in the oil filter. This accumulation decreased lubricant quality by forming wear debris and sludge, potentially clogging lubrication channels. It was concluded that the lubricating oil quality degraded over four months of use. This issue can be mitigated by inspecting and repairing or replacing contaminated or worn parts, partially draining the oil via the underdrain tap during circulation, and topping up with the same oil grade.
Optimizing Preventive Maintenance Scheduling of Centrifugal Pumps Using FTA and FMEA Techniques Yosep Salfaridus Nong Sandro; Rusindiyanto Rusindiyanto
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 19 No. 1 (2025): SINTEK JURNAL
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.19.1.82-92

Abstract

Centrifugal pumps are critical assets within the production system of PT XYZ. Failures in their subcomponents can cause significant operational disruptions. This study aims to optimize the preventive maintenance scheduling for centrifugal pumps by integrating Fault Tree Analysis (FTA) and Failure Mode and Effect Analysis (FMEA). The FMEA identified the highest Risk Priority Numbers (RPNs) for the ball bearing (252), mechanical seal (240), and impeller lock (240), which are associated with risks such as overheating, leakage, and wear. Based on these findings, a revised preventive maintenance schedule comprising 63 tasks was developed. Implementing this optimized schedule increased machine reliability from 76.98% to 95%, corresponding to an 18.02% improvement in effective operational availability through reduced downtime. These results underscore the importance of a structured, risk-based preventive maintenance strategy for ensuring production continuity. The study recommends increasing the maintenance frequency for critical components, selecting more durable materials, and implementing regular condition monitoring. The findings demonstrate that risk-based maintenance strategies can significantly enhance system reliability and industrial process efficiency.
Implementation of Lean Manufacturing, VSM, FMEA, and RCA to Reduce Waste in Fertilizer Production Endang Agustina; Joumil A Saifudin
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 19 No. 1 (2025): SINTEK JURNAL
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.19.1.102-112

Abstract

This study aims to minimize waste in the production of Phonska IV subsidized compound fertilizer by implementing an integrated Lean Manufacturing approach. The methodology combines Value Stream Mapping (VSM), Failure Mode and Effect Analysis (FMEA), and Root Cause Analysis (RCA). Value Stream Analysis Tool (VALSAT) was employed to identify non-value-added activities, revealing four dominant wastes: waiting, defects, excess processing, and overproduction. Root causes were investigated using fishbone diagrams, and risks were prioritized via FMEA based on the Risk Priority Number (RPN). Implemented countermeasures included standardizing raw material checks, validating materials pre-mixing, scheduling preventive maintenance, and adopting demand-driven production planning. These interventions reduced the total production cycle time from 215 minutes to 150 minutes, achieving a 30.2% efficiency improvement. The study demonstrates the practical efficacy of integrating VSM, RCA, and FMEA in a continuous-process industry and contributes a structured model for systematic waste reduction in subsidized fertilizer manufacturing.

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