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Hamdan Akbar Notonegoro
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FLYWHEEL : Jurnal Teknik Mesin Untirta
Published by Universitas Sultan Ageng Tirtayasa
ISSN : 24077852     EISSN : 25977083     DOI : https://doi.org/10.36055/fwl.v0i0.
Core Subject : Science, Engineering,
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation
The journal publishes original and (mini)review articles covering the concepts of materials science, mechanics, kinematics, thermodynamics, energy and environment, mechatronics and robotics, fluid mechanics, tribology, cybernetics, industrial engineering and structural analysis. The journal follows new trends and progress proven practice in the mechanical engineering and also in the closely related sciences as are electrical, civil and process engineering, medicine, microbiology, ecology, agriculture, transport systems, aviation, and others, thus creating a unique forum for interdisciplinary or multidisciplinary dialogue.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 233 Documents
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The Effect of Rotational Speed, Draining Time, and Type of Cooking Oil on the Oil Extraction Efficiency of a Spinner Machine Purnama, Septya Agung; Usman, Mualifi; Fahrurozi, Muhammad; Muflihah, Nur
FLYWHEEL : Jurnal Teknik Mesin Untirta Vol 11, No 2 (2025): October
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fwl.v11i2.35342

Abstract

This study aims to determine the effects of rotational speed, drying time, and type of cooking oil on the oil draining efficiency of a spinner machine. The main issue addressed is the high residual oil content in fried food products, which negatively affects product quality and consumer health. The research was conducted using a 3x3x2 factorial experimental design, involving three levels of rotational speed (1000, 1200, 1400 rpm), three levels of draining time (5, 7, 10 minutes), and two types of cooking oil (palm oil and coconut oil). Samples of crispy mushrooms were fried and then drained using a spinner machine. Data were analyzed using a completely randomized model ANOVA (Analysis of Variance). The results show that all factors (rotational speed, draining time, and oil type) and their interactions significantly affect the de-oiling efficiency (p < 0.05). The optimal combination was achieved at 1400 rpm, 10 minutes, and using coconut oil, resulting in the highest oil-draining value of 85.31 grams. This study provides technical recommendations for improving food production efficiency with lower oil content and better product quality.
Experimental Analysis of Water Column Height and Air Flow Rate Effects on Two-Phase Airlift Pump Performance Fidaroin, Arsyad Ni'am; Mujiarto, Sigit; Hayati, Nur; Saleh, Arif Rahman
FLYWHEEL : Jurnal Teknik Mesin Untirta Vol 11, No 2 (2025): October
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fwl.v11i2.35639

Abstract

This study experimentally investigates the effects of water column height and air flow rate on the performance of a two-phase airlift pump with a 15° injector angle. Two water column heights  and  and four air flow rates (30, 40, 50, and 60 LPM) were tested in a laboratory-scale setup. Efficiency was calculated using the Nicklin model, while effectiveness was determined based on the ratio of water to air mass flow rates. Flow patterns were recorded and analyzed using a high-speed camera. The results showed that increasing the water column height significantly improved both efficiency and effectiveness, with the highest values—12.270% and 2354.78, respectively achieved at  and 60 LPM. Flow pattern observations revealed that slug flow dominated at partial submergence, whereas churn flow became prevalent at full submergence with higher air flow rates. The findings demonstrate that optimizing submergence ratio, air flow rate, and injector configuration is essential for achieving high-performance and energy-efficient airlift pump operation.
The Effect of Compaction Pressure and Matrix Percentage on the Properties of Phenolic Resin-Metal Powder-RHA Hybrid Composites for Brake Pads Sukanto, Sukanto; Ardiansyah, Ardiansyah; Erwanto, Erwanto; Budi, Abdul; Wanto, Agus
FLYWHEEL : Jurnal Teknik Mesin Untirta Vol 12, No 1 (2026): April
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fwl.v12i1.36919

Abstract

This study aims to analyze the effect of compaction pressure variation and matrix percentage on the mechanical and physical properties of phenolic resin–metal powder–RHA hybrid composites as an alternative non-asbestos brake pad material. The composite manufacturing process was carried out using the powder metallurgy method, which included milling, compaction at pressures of 5000, 5300, and 5600 psi, and sintering at a temperature of 130°C for 10 minutes. The tests included Brinell hardness based on ASTM E110-14 and density using the Archimedes method according to ASTM B962-17. The results showed that an increase in compaction pressure had a significant effect on increasing both hardness and density. Optimal conditions were obtained at a pressure of 5600 psi and a matrix fraction of 35%, resulting in a hardness of 103.77 HB and a density of 1.54 g/cm³. These values meet the standards for commercial brake pad materials, namely a hardness of 65–105 HB and a density of 1.5–2.5 g/cm³. Thus, the developed hybrid composite has the potential to be used as an environmentally friendly brake pad material to replace asbestos. Further research is recommended to examine the tribological properties and wear resistance to ensure the performance of the material under actual working conditions.
Cooling Media Variation in Welding Stations and Its Effects on Labor Productivity and Operator Requirements Darmawan, Didit; Hamid, Abdul
FLYWHEEL : Jurnal Teknik Mesin Untirta Vol 12, No 1 (2026): April
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fwl.v12i1.39690

Abstract

Cooling media variation in welding stations determines waiting time between cycles, directly affecting labor utilization, daily welding cycles, and operator requirements. Water provides shortest waiting time but risks metallurgical damage on hardenable steels. Compressed air offers safest cooling for critical materials but longest waiting time. Water mist allows adjustable cooling rates, balancing productivity and quality. Labor utilization ranges from 50 percent with air cooling to 90 percent with water cooling under optimal conditions. Daily cycles per operator vary inversely with waiting time. Operator count for fixed production targets increases proportionally with waiting time. Material thickness, welding position, base metal type, application method, operator skill, and production line integration moderate these relationships. Economic analysis must consider trade offs between additional labor costs and rework or failure costs.
The effect of cooling media and quenching temperature on the tempering process of AISI 1045 steel. Saputro, Akbar Dicky; Listyanda, R. Faiz; Darmo, Aditya Noor Setyo Hadi; Mulyaningsih, Nani
FLYWHEEL : Jurnal Teknik Mesin Untirta Vol 12, No 1 (2026): April
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fwl.v12i1.36743

Abstract

AISI 1045 steel is widely used in machine components due to its high strength and good wear resistance, but its mechanical properties can still be optimized through heat treatment. This research aims to determine the effect of cooling media and variations in tempering temperature on the characteristics of AISI 1045 steel. The problem studied is how the quenching temperature (800°C and 850°C) and the type of cooling media (25% salt water and biodiesel) influence the tensile strength, hardness, and microstructure of the steel. The research method was carried out experimentally with quenching and tempering heat treatment at a temperature of 550°C for 60 minutes, followed by tensile tests, Vickers hardness tests, and microstructure observations. The research results showed that the highest hardness value was found in the 850°C quenched salt water specimen, which was 576.10 kgf/μm, while the highest tensile strength in the tempered 850°C salt water specimen was 1047.53 MPa, and the highest strain in the tempered 850°C biodiesel specimen was 29.17%. The formed microstructure shows the presence of tempered martensite and fine carbide precipitation, which increases the material’s ductility. In conclusion, the combination of a quenching temperature of 850°C with salt water media.
Pipe Support Welding Fabrication Process Using the Shielded Metal Arc Welding Method at PT XYZ Prasetya, Herdi Eka; Hanifi, Rizal; Dirja, Iman; Sumarjo, Jojo
FLYWHEEL : Jurnal Teknik Mesin Untirta Vol 12, No 1 (2026): April
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fwl.v12i1.39502

Abstract

This study presents the fabrication process of pipe support welding using the Shielded Metal Arc Welding (SMAW) method at PT Kinarya Gemilang Adhitama. The objective of this research is to examine the fabrication stages, identify the tools and materials involved, and analyze the key parameters that influence welding quality. The method employed is direct field observation during an industrial internship, supported by documentation and technical data collection in the workshop environment. The fabrication process includes material preparation, cutting, positioning, welding, cleaning, and quality control. Stainless steel SS 304 is used as the primary material, combined with SW 308 electrodes to ensure compatibility and corrosion resistance. The welding process is carried out using a DC inverter welding machine with controlled parameters, specifically a current of 220 A and a voltage of 46 V, to achieve optimal joint strength and stability. After welding, the cleaning process is conducted using a grinding tool to remove slag and impurities. Quality control is performed through visual testing and penetrant testing to detect surface defects such as cracks, porosity, and incomplete fusion. The results show that the SMAW method is effective and efficient for pipe support fabrication due to its flexibility, ease of application in various positions, and relatively low operational cost. Furthermore, the quality of the weld is highly dependent on welder skill, electrode selection, and proper parameter settings. Overall, the fabrication process meets industrial standards and produces reliable pipe support components suitable for piping systems.
Analysis of Heat Transfer Effectiveness Using A Plate Heat Exchanger in the Pasteurization Process at PT. XYZ Ramadhan, M. Keitaro; Sumarjo, Jojo; Ujiburrahman, Ujiburrahman; Santoso, Deri Teguh
FLYWHEEL : Jurnal Teknik Mesin Untirta Vol 12, No 1 (2026): April
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fwl.v12i1.38624

Abstract

Pasteurization is a critical process in ice cream production to ensure product safety by eliminating pathogenic microorganisms, in which the Plate Heat Exchanger (PHE) plays a vital role in heat transfer efficiency. Inefficient heat transfer can reduce product quality and increase energy consumption. This study aims to evaluate the thermal performance and effectiveness of the PHE used in the pasteurization process at PT XYZ. The research method employed is quantitative analysis based on operational data collected over a 30-day period, including inlet and outlet temperatures, mass flow rates, and thermophysical properties of the ice cream mix and heating water. Heat transfer analysis was conducted using theoretical calculations of heat transfer rate, Log Mean Temperature Difference (LMTD), overall heat transfer coefficient, and heat exchanger effectiveness. The results indicate that the PHE operates with high thermal efficiency, achieving effectiveness values ranging from 90% to 99%, with an average effectiveness exceeding 94%. Optimal operating conditions were achieved when the PHE plates were fully supplied with circulating hot water, resulting in minimal heat transfer resistance. In contrast, efficiency reductions occurred during operating periods close to the Cleaning in Place (CIP) process, which led to a decrease in the overall heat transfer coefficient, as well as during transient operating conditions where large initial temperature differences between the product and heating water prevented optimal heat transfer. These findings demonstrate that the PHE performs effectively and meets operational standards for pasteurization in ice cream production processes.
Microstructure Features and Degradation Mechanisms of Low-Pressure Evaporator Tube Steels in Combined Cycle Power Plants Nugraha, YangYang Gilang; Erwin, Erwin; Listijorini, Erny; Dwinanto, Dwinanto; Alhamidi, Ahmad Ali; Satria, Dhimas; Saefuloh, Iman; Yusuf, Yusvardi; Sunardi, Sunardi
FLYWHEEL : Jurnal Teknik Mesin Untirta Vol 10, No 2 (2024): October
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fwl.v10i2.39002

Abstract

A leakage failure occurred in a low-pressure evaporator tube of a Heat Recovery Steam Generator (HRSG) in a combined cycle power plant. The failed tube, manufactured from ST 37.8 CL1 steel, was investigated to determine the root cause of failure. The analysis included visual inspection, metallographic examination, and hardness testing. Visual observation revealed localized leakage regions associated with material degradation. Metallographic analysis showed a ferrite–pearlite microstructure with pronounced pearlite growth and the presence of micro-cavities concentrated along grain boundaries. Hardness measurements indicated that the failed tube exhibited higher hardness values (average 83.3 HRB) compared to unused material (average 76.6 HRB), reflecting microstructural evolution during service. The tube operated at approximately 143.8 °C under continuous internal pressure. Long-term exposure to these conditions promoted creep damage, characterized by the nucleation of micro-cavities at ferrite–pearlite interfaces. Progressive cavity growth and coalescence reduced ductility and facilitated crack initiation, ultimately leading to leakage. The findings demonstrate that creep-induced cavity formation associated with pearlite growth was the primary failure mechanism of the low-pressure evaporator tube.
Analysis of the Impact of Pressure on the Performance of A Split Air Conditioning System (AC) Using the Refrigerant R-410A Pratama, Ofik Wahyu; Saputra, Trisma Jaya; Sulistiyo, Raka Mahendra; Mujiarto, Sigit
FLYWHEEL : Jurnal Teknik Mesin Untirta Vol 12, No 1 (2026): April
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fwl.v12i1.36055

Abstract

Studi ini menganalisis efek fluktuasi tekanan pada kinerja pendingin udara (AC) sistem split menggunakan refrigeran R-410A. Masalah utama yang diselidiki adalah bagaimana tekanan operasi memengaruhi efek pendinginan dan koefisien kinerja (COP), serta efisiensi pendinginan sistem secara keseluruhan. Dalam metode eksperimen, tekanan refrigeran divariasikan menjadi 120, 130, 140, dan 150 psi. Data dikumpulkan pada setiap pengaturan tekanan selama satu jam dengan interval 10 menit. Hasilnya menunjukkan bahwa peningkatan tekanan refrigeran secara bertahap menurunkan kerja kompresor dan efek pendinginan. Tekanan 150 psi menghasilkan kerja kompresor paling sedikit (26,98 kJ/kg) dan nilai COP tertinggi (5), yang menunjukkan operasi sistem pendingin udara yang paling efisien. Sebaliknya, tekanan 120 psi memberikan efek pendinginan terbesar (141,35 kJ/kg), tetapi dengan nilai COP yang lebih rendah. Singkatnya, pengaturan tekanan 150 psi memberikan kinerja pendingin udara yang paling efisien, meskipun kapasitas pendinginan maksimum dicapai pada 120 psi.
Analysis of LPG Butane (C4H10) Flow Pattern on Swivel Joint Style 40 Sch 80 Using Ansys Fluent Irawan, I Putu Redy; Buku, Atus; Siahaya, Yusuf
FLYWHEEL : Jurnal Teknik Mesin Untirta Vol 12, No 1 (2026): April
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fwl.v12i1.38707

Abstract

The Style 40 swivel joint is a critical component in industrial LPG piping systems, enabling angular motion while maintaining flow continuity. However, geometric misalignment induced by the hinge mechanism can significantly affect internal flow behavior, leading to pressure losses and velocity redistribution. This study aims to investigate the pressure and velocity characteristics of LPG (butane, C₄H₁₀) flow through a Style 40 swivel joint with a hinge rotation angle of 90° using a Computational Fluid Dynamics (CFD) approach. Numerical simulations were conducted using ANSYS Fluent, employing the realizable k–ε turbulence model. The inlet boundary condition was defined by a uniform velocity of 0.139 m/s, while the outlet was specified as 0 Pa. The results indicate that the maximum pressure occurs at the inlet region, reaching approximately 4.8 × 10⁻² Pa, whereas the minimum pressure at the outlet decreases to about −3.0 × 10⁻² Pa, resulting in a total pressure drop of roughly 7.8 × 10⁻² Pa. The flow velocity increases from approximately 0.06 m/s at the inlet to a peak value of 0.24–0.25 m/s near the outlet, accompanied by the formation of localized secondary flows around the hinge region. These findings demonstrate that the hinge mechanism plays a dominant role in governing local pressure losses and velocity redistribution, providing valuable insights for the design and performance evaluation of swivel joints in LPG piping applications.

Page 23 of 24 | Total Record : 233

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