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All Journal R.E.M (Rekyasa Energi Manufaktur) Jurnal Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Jurnal Bakti Masyarakat Indonesia Logic : Jurnal Rancang Bangun Dan Teknologi Jurnal Marine Inside Applied Science Technology in Naval Engineering (ASTNE)
Mahdhudhu, Fathin Muhammad
Universitas Pembangunan Nasional Veteran Jakarta
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences Transportation Other

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SOSIALISASI RISIKO LIMBAH MINYAK JELANTAH DAN SOLUSINYA Wahyuni, Fitri; Nisa, Rasya Aulia Nathania; Julian, James; Lumbantoruan, Regina Natalindah; Mahdhudhu, Fathin Muhammad; Purba, Riki Hendra; Armadani, Elvi
Jurnal Bakti Masyarakat Indonesia Vol. 8 No. 1 (2025): Jurnal Bakti Masyarakat Indonesia
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jbmi.v8i1.34381

Abstract

Used cooking oil is cooking oil that is no longer suitable for use because it has undergone changes in physical and chemical properties during the frying process. Used cooking oil is a hazardous and toxic waste; consuming it can cause negative impacts on health and disposing of it carelessly can cause environmental pollution. However, public knowledge about the dangers and impacts of used cooking oil is still minimal. A study showed that there are still many people who dispose of used cooking oil on the ground and waterways. Therefore, the activity designed by the PKM team of Universitas Pembangunan Nasional Veteran Jakarta aims to increase public knowledge about the dangers and impacts of used cooking oil and provide solutions to reduce the pollution of used cooking oil waste. This activity was carried out in the Grand Pakis Residence housing complex using socialization and training methods. In this activity, the PKM team invited representatives from the Jalantara foundation as speakers to explain the impact of used cooking oil on the environment and health to the community. Not only that, the community was also given a training on processing used cooking oil into other products as a solution to reduce used cooking oil waste. The result of this activity is that the knowledge of residents about the dangers of used cooking oil for the environment and health has increased by 80.95%. In addition, the residents also know how to reduce used cooking oil by turning it into useful products such as soap.
Analisis Pengaruh Anti Kavitasi Terhadap Kavitasi Pada Sea Chest Valve Di Kapal daffa, Fatih izzudin; Mahdhudhu, Fathin Muhammad
Applied Science and Technology on Naval Engineering Vol 3 No 1 (2025): Applied Science and Technology on Naval Engineering (ASTNE)
Publisher : Fakultas Teknik UPN Veteran Jakarta

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

Abstract

Kavitasi pada valve merupakan fenomena yang sering terjadi di lingkungan kapal yang dapat menyebabkan kerusakan pada sistem perpipaan dan komponen terkait. Para owner kapal kerap menganggap sepele permasalahan kavitasi ini sehingga valve kerap tidak beroperasional dengan baik karena terjadinya kavitasi. Penelitian ini bertujuan untuk menganalisis pengaruh penggunaan teknologi anti kavitasi terhadap fenomena kavitasi pada Sea Chest Valve. Metode yang digunakan meliputi pengumpulan data lapangan dari kapal yang beroperasi secara rutin, serta simulasi menggunakan software Valvstream untuk mengetahui efektivitas penambahan trim anti kavitasi. Studi ini bertujuan untuk menganalisis efektivitas Trim anti kavitasi pada Sea Chest Valve dengan variasi pressure, temperature, sound level, dan viscosity serta membuat prototype valve yang terpasang trim anti kavitasi. Analisis simulasimenunjukkan bahwa penurunan tekanan, kenaikan temperature, sound level yang tinggi dan viscosity yang tinggi sebagai indikator terjadinya kavitasi dapat berkurang dengan ditambahkan nya anti kavitasi. Penelitian ini memberikan kontribusi dalam memahami mekanisme kavitasi pada aplikasi Sea Chest Valve di kapal serta memberikan rekomendasi untuk pengembangan teknologi anti kavitasi di masa depan. Implikasi praktis dari penelitian ini adalah potensi untuk meningkatkan keandalan dan masa pakai sistem perpipaan pada kapal, serta mengurangi terjadinya kavitasi.
Comprehensive Analysis on the Influence of Flap Width on the Hydrodynamic Parameters of OWSC Devices Rasya Aulia Nathania Nisa; James Julian; Fitri Wahyuni; Riki Hendra Purba; Fathin Muhammad Mahdhudhu; Elvi Armadani
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 3 (2025): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i3.201-209

Abstract

The growing need for renewable energy has driven significant interest in harnessing ocean wave power, particularly through Oscillating Wave Surge Converters (OWSCs). This study focuses on examining the effect of flap width on the hydrodynamic capacity of an OWSC, as flap geometry plays a crucial role in energy capture efficiency. A numerical methodology utilizing the Boundary Element Method (BEM) was employed to assess hydrodynamic parameters across both temporal and frequency domains. Five flap width variations were tested under regular wave conditions with different periods, while mesh independence and validation against experimental data ensured accuracy. The results in the time domain revealed a direct correlation between flap width and angular deviation, velocity, torque, and power output, although wider flaps exhibited less stability due to increased inertia. Frequency domain analysis indicated that each flap width had a distinct resonant peak, with narrower flaps performing best at shorter periods and wider flaps at longer ones. Notably, moderately sized flaps (W2 and W3) achieved the highest efficiency, with Capture Width Ratios exceeding 70%, outperforming wider flaps despite their larger surface area. These findings highlight the importance of optimized flap width for efficient and reliable OWSC design.
Development of a Platform Supply Vessel: Design, Resistance Assessment, and Prototype Fabrication for Offshore Operations in Natuna, Indonesia Fathin Muhammad Mahdhudhu; Fakhri Akbar Ayub; Muhammad Akmal Apriansyah Efendy; Muhammad Ivan Kurniawan; Choirul Anam; Fathan Mubina Denu; Nabillah Jasmine Anugrahputri
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 8 Number 1 (2026)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v8i1.8994

Abstract

Maritime transportation serves as a vital component of inter-island connectivity in Indonesia, particularly in supporting offshore oil and gas exploration activities. This study focuses on addressing the rarity of Platform Supply Vessel in the Natuna Islands, which are needed to support offshore operations to optimize the exploration of Natuna's abundant natural resources. The design process begins with the determination of the vessel’s principal dimensions, derived from benchmark vessel data and dimensional ratio analysis. The hull form is subsequently developed into a 3D model to produce a lines plan. Resistance analysis is conducted based on the Holtrop method, encompassing components such as frictional resistance, wave-making resistance, transom drag, and air resistance. A scaled physical model is also constructed using a non-molded hull fabrication technique to validate the design. The findings indicate that the proposed hull design satisfies the specified performance criteria and demonstrates favorable resistance characteristics. This research answers the rarity of studies on Platform Supply Vessel specifically for Natuna by contributing a comprehensive study focusing on design, fabrication, and cost analysis.
Finite Element Analysis of Impact-Velocity Effects on the Erosion Behavior of GH4720Li Superalloy-Based Cr₃C₂ Coatings Riki Hendra Purba; Raffi Indrajati; Fitri Wahyuni; James Julian; Elvi Armadani; Fathin Muhammad Mahdhudhu
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 8 Number 1 (2026)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v8i1.9317

Abstract

This study examines the effect of impact velocity on the erosion behavior of GH4720Li superalloy with and without Cr₃C₂–NiCr coating using Finite Element Analysis. Silica particles (0.7 mm) were modeled at velocities of 25–125 m/s under normal impact. Results show that increasing velocity raises the maximum Von Mises stress before reaching a dynamic equilibrium. Coated specimens exhibited nearly twice the stress values of uncoated ones, indicating better load distribution and initial damage resistance. At low velocities (25–50 m/s), the coating reduced plastic deformation by absorbing impact energy. However, at higher velocities (≥75 m/s), the coating transferred more energy to the substrate, causing greater plastic strain than in uncoated material. These findings demonstrate that cermet coatings improve erosion resistance at low-to-moderate velocities but have limited performance under high-velocity impacts
Numerical Investigation on Aerodynamic Characteristics of Bio-Inspired Nose Airfoil NACA 4415 Fitri Wahyuni; James Julian; Saphira Anggraita Siswanto; Riki Hendra Purba; Fathin Muhammad Mahdhudhu; Elvi Armadani; Nely Toding Bunga
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 8 Number 1 (2026)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v8i1.9428

Abstract

It is widely believed that bionic airfoils can influence aerodynamic performance. Therefore, this study focuses on analyzing the effect of a bio-inspired nose on the NACA 4415 airfoil. This study uses roughtoothed dolphins and spinner dolphins as modifications of the airfoil, which are then tested at Re = 1.6×105 using Computational Fluid Dynamics (CFD). From the simulation results, it was shown that the baseline NACA 4415 has the best aerodynamic performance across all Angles of Attack (AoA). The average percentage increase in Cd for the spinner dolphin is lower, at 40.399% compared to the baseline. On the other hand, the roughtoothed dolphin shows a higher percentage increase in Cd with an average of 51.479% compared to the baseline. While in the Cl data, the rough-toothed dolphin has a larger average percentage decrease, at -10.472%, whereas the spinner dolphin achieves an average decrease of only -5.194% compared to the baseline. Therefore, it can be concluded that the rough-toothed and spinner dolphin modifications do not enhance the aerodynamic performance of the NACA 4415 airfoil at AoA. However, at low AoA, the roughtoothed dolphin modification performs comparably to the baseline NACA 4415 airfoil.
The Influence of Bluff Body Shape Variations on Aerodynamic Characteristics in Flow Around a Cylinder Christian Jovie Yudhananta; Fitri Wahyuni; James Julian; Riki Hendra Purba; Fathin Muhammad Mahdhudhu; Elvi Armadani; Nely Toding Bunga
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 8 Number 1 (2026)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v8i1.9429.2

Abstract

Fluid flow around an object plays an important role in various fields, including aerodynamics, building design, and transportation. This study examines the effect of three two-dimensional bluff body shapes, including Circular, Square, and Diamond, on the flow pattern, drag and lift coefficients, and vortex shedding characteristics. The methodology used is Computational Fluid Dynamics (CFD) simulation for incompressible flow with a Reynolds number of 100. The results show that variations in geometric shapes significantly affect the shape formation, flow stability, and aerodynamic force response. The three bluff body variations were found to produce fluctuating aerodynamic characteristics due to the influence of the von Kármán vortex phenomenon. In the diamond cylinder variation, it was found to be the configuration with the widest shape, having the highest average drag coefficient value of 1.84, and exhibiting the most significant force amplification, with an average lift coefficient value of 0.36 and a Strouhal number (St) of 0.18. Overall, variations in bluff body shapes significantly affect the flow pattern, Vortex Shedding frequency, and the total aerodynamic force acting on the object
Thermal Performance of Analysis of Serpentine Channel Cold Plate for 18650 Cylindrical Lithium-Ion Battery Fitri Wahyuni; James Julian; Rainer Samuel Fourlando; Riki Hendra Purba; Fathin Muhammad Mahdhudhu; Elvi Armadani; Nely Toding Bunga
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 8 Number 1 (2026)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v8i1.9430

Abstract

This research evaluates the thermal performance of a liquid cooling system with serpentine channel inlets for an 18650 cylindrical lithium-ion battery module. The study analyzed an eight-cell module with a baseline configuration and variations featuring two, three, and four serpentine curves using computational fluid dynamics simulations validated against previous experiments. A fixed mass flow rate of 0.0001 kg/s was applied. Results showed all configurations-maintained battery temperatures below 37.5°C, preventing thermal runaway. The Baseline configuration achieved the lowest maximum temperature of 37.447°C and the highest performance factor (J/F factor) of 0.053. The two serpentine curves offered the best temperature uniformity (1.114°C) and highest heat transfer coefficient. Although more serpentine curves reduced maximum temperature, they increased pressure drop, decreasing the J/F factor. The study concludes that the serpentine cold plate design effectively manages thermal containment, with the two-curve configuration providing the best balance of heat transfer and temperature stability.
NUMERICAL STUDY ON THERMAL PERFORMANCE OF MINI-CHANNEL COOLING ON CYLINDRICAL LITHIUM-ION BATTERY COOLING SYSTEM Elvi Ermadani; James Julian; Bima Rakha Adhitama; Fitri Wahyuni; Riki Hendra Purba; Fathin Muhammad Mahdhudhu; Adi Winarta
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 26 No. 1 (2026): March
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v26i1.86-94

Abstract

This study investigates how a liquid-based cooling configuration influences the thermal behavior of a cylindrical lithium-ion (Li-ion) battery pack through numerical analysis. The work underscores the crucial role of proper thermal regulation to maintain operational safety and prolong battery lifespan in high-demand applications such as electric vehicles (EVs). Three cooling-channel diameters—4, 6, and 8 mm—were examined under a 5C discharge condition. The findings indicate that the 8 mm channel offers the most advantageous performance, delivering the lowest maximum temperature, quicker thermal stabilization, and improved temperature uniformity. Conversely, the 4 mm channel resulted in elevated peak temperatures and a temperature gradient (ΔT) of 8.3 °C, which may intensify hotspot formation and accelerate cell degradation. Overall, the results emphasize the importance of selecting an appropriate cooling-channel diameter to effectively mitigate thermal stress.
Effect of Anadara Granosa Shell Volume Fraction on Erosive Wear and Hardness Behaviour of Al 6061 Metal Matrix Composites Riki Hendra Purba; Aldi Raditya Adriansyah; James Julian; Fitri Wahyuni; Elvi Armadani; Fathin Muhammad Mahdhudhu
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 1 (2026): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i1.1795

Abstract

Despite the favorable mechanical properties of Anadara Granosa Shell (AGS), particularly hardness, its influence on the wear resistance of Metal Matrix Composites (MMCs) remains insufficiently explored. Therefore, this study aims to investigate the potential of AGS waste as an eco-friendly reinforcement for Al6061 alloy. Composites were fabricated with 0 wt%, 5 wt%, 10 wt%, and 15 wt% AGS addition. Wear behavior of each specimen was evaluated using sandblast with SiO2 as the erodent particles. The investigation also involved the microstructure and wear mechanism observation using optical microscope and Scanning Electron Microscopy (SEM). In addition, the hardness of each material measurement using Vickers hardness test was included to obtain a comprehensive insight. The results shows that the AGS reinforcement was evenly distributed within the matrix, though a minor presence of voids was observed. The hardness of specimens exhibited a consistent increase proportional to the AGS content. Interestingly, the erosion rate showed no significant difference between the 0 wt% and 5 wt% AGS additions, but drastically increased with 10 wt% and 15 wt% reinforcement. This suggests that hardness is not the primary factor governing the erosion behavior in these composites. Analysis of the worn surfaces revealed a prevalent wear mechanism: reinforcement particle peel-out, which became more severe at 10 wt% and 15 wt% AGS concentrations. Conversely, the unreinforced (0 wt%) Al 6061 alloy displayed ripple formation, indicating a plastic deformation mechanism typical of a ductile material. Therefore, this study highlights the critical importance of considering the wear mechanism, specifically the susceptibility to particle pull-out, when evaluating the erosive wear behavior of Al6061 MMCs reinforced with Anadara Granosa Shell waste.
Co-Authors Adi Winarta, Adi Aldi Raditya Adriansyah Bima Rakha Adhitama Bunga, Nely Toding Choirul Anam Christian Jovie Yudhananta daffa, Fatih izzudin Elvi Armadani Fakhri Akbar Ayub Fathan Mubina Denu Fitri Wahyuni Fitri Wahyuni Fitri Wahyuni James Julian Lumbantoruan, Regina Natalindah Muhammad Akmal Apriansyah Efendy Muhammad Ivan Kurniawan Muhammad Izul A’dhom Nabillah Jasmine Anugrahputri Nisa, Rasya Aulia Nathania Raffi Indrajati Rainer Samuel Fourlando Rasya Aulia Nathania Nisa Riki Hendra Purba Rizki Aldi Anggara Saphira Anggraita Siswanto