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All Journal R.E.M (Rekyasa Energi Manufaktur) Jurnal Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Jurnal Bakti Masyarakat Indonesia Mitra Mahajana: Jurnal Pengabdian Masyarakat Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) Logic : Jurnal Rancang Bangun Dan Teknologi Jurnal Marine Inside Applied Science and Technology on Naval Engineering
Fathin Muhammad Mahdhudhu
Universitas Pembangunan Nasional Veteran Jakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering Public Health Social Sciences Transportation Other

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Performance and Emission Analysis of Piston Bowl Type and Depth Variations on Diesel Engine Shark R180 Fathin Muhammad Mahdhudhu; Agung Dwi Priono; Shadinty Azhar Sausan; James Julian; Elvi Armadani; Riki Hendra Purba; Fitri Wahyuni
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 70 No 2 (2026): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v70i2.633

Abstract

The performance and emission study on the different types of piston bowls and the depth variation of the piston bowl is discussed in this paper. Simulations were conducted using the open-source software, Diesel-RK. Three models of piston bowls and five variations of piston depth were used to estimate performance and emissions. The type of fuel and engine operating conditions were set to be constant. The performance responses consist of power, Specific Fuel Consumption (SFC), and brake mean effective pressure (BMEP). On the other hand, the emissions of NOx and Particulate matter (PM) were analyzed. Results show that both power response and BMEP improve with an increase in piston depth across all types of piston bowls. On the contrary, the SFC trend line shows a decline as piston depth increases. For the emissions, NOx experiences a rising trend as the depth of the piston bowl increases at all types of piston bowls. Conversely, the particulate matter (PM) trend is decreasing as the depth of the piston bowl increases.
THE UTILIZATION OF DIGITAL MARKETING STRATEGIES TO IMPROVE TILAPIA MARKETING AT MERUYUNG FISH FARM Fitri Wahyuni; Irsyada Ahmad Althaf Farih; Riki Hendra Purba; James Julian; Miguna Astuti; Fathin Muhammad Mahdhudhu; Elvi Armadani
Mitra Mahajana: Jurnal Pengabdian Masyarakat Vol. 7 No. 2 (2026): Volume 7 Nomor 2 Tahun 2026
Publisher : LPPM Universitas Flores

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37478/mahajana.v7i2.8465

Abstract

The main challenges faced by freshwater fish farming MSMEs, such as Meruyung Fish Farm in Depok, are the efficiency of the aeration system and conventional marketing management. This results in low productivity, high operational costs, and minimal market competitiveness. To overcome these problems, the community service team implemented two strategic solutions: technology and innovation, as well as improvements in marketing management. The technological approach focused on the design and application of Superchargers as an energy-efficient aeration system. This technology can effectively increase dissolved oxygen levels, which positively impacts fish growth, feed efficiency, and survival rates. Previous research shows that one Supercharger unit can aerate up to 10 pounds, significantly reducing energy consumption compared to conventional methods. On the other hand, marketing management improvements were carried out through business incubation and digital marketing. These activities include training in processed product diversification, promotional content creation, social media and e-commerce management. Thus, this program not only improves productivity from a technical perspective but also strengthens the business capacity of partners to be more competitive and sustainable in the market. The expected outcome is a 20% increase in the production capacity and sales turnover of partners.
Investigation of Bluff Body Shape Variation on Enhancing Heat Transfer Performance of Backward-Facing Step Flow Fitri Wahyuni; Rizki Aldi Anggara; James Julian; Riki Hendra Purba; Fathin Muhammad Mahdhudhu; Elvi Armadani; Nely Toding Bunga
Jurnal ASIIMETRIK Jurnal Ilmiah Rekayasa & Inovasi Volume 8 Number 2 (2026)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v8i2.10260

Abstract

The control of flow separation phenomenon is a challenge that has attracted much attention from researchers in the context of heat and mass transfer. This phenomenon negatively affects heat transfer performance in thermal management applications. Flow control devices play a crucial role in minimizing the effects of flow separation. One of the fundamental geometries that supports understanding in flow separation control is the backward-facing step. Therefore, this study aims to investigate the utilization of bluff body shape variations, including cube, cylinder, and diamond shapes, as passive flow control devices on heat transfer performance in backward-facing step flow. The present study used a Computational Fluid Dynamics solver, followed by a variation of the Reynolds number, 50 ≤ Re ≤ 400. Computational results show that the bluff body significantly reduces the primary recirculation zone and compresses the thermal boundary layer, strengthening the temperature gradient and improving the heat transfer rate. The cube variation demonstrates the optimal thermal performance, exhibiting an augmentation in the average Nusselt number of up to 28.15% at Re = 400, resulting the highest overall Performance Evaluation Criterion.
Analisis Pengaruh Anti Kavitasi Terhadap Kavitasi Pada Sea Chest Valve Di Kapal Fatih izzudin daffa; Fathin Muhammad Mahdhudhu
Applied Science and Technology on Naval Engineering Vol 3 No 1 (2025)
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.
Injection Timing Effect on Emisson Characteristic of a Dual-Fuel Diesel Engine Dyas Isnaen Ilham; Fathin Muhammad Mahdhudhu
Applied Science and Technology on Naval Engineering Vol 4 No 2 (2026)
Publisher : Fakultas Teknik UPN Veteran Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54378/astne.v4i2v2.03

Abstract

The maritime industry is facing increasingly stringent emission regulations, driving the development of cleaner combustion technologies such as dual-fuel diesel engines fueled by natural gas. Among various operational parameters, pilot diesel injection timing plays a crucial role in determining combustion characteristics and exhaust emissions. This study numerically investigates the effect of Start of Injection (SOI) on the emission characteristics of a methane dual-fuel diesel engine using three-dimensional computational fluid dynamics (CFD) simulations in ANSYS Forte. A 45° sector model with a re-entrant piston bowl geometry was employed to represent the combustion chamber while maintaining computational efficiency. The simulations were conducted at an engine speed of 1335 rpm by varying the pilot diesel SOI from −37.5° to −27.5° CA bTDC. The results indicate that retarding the injection timing significantly increases incomplete combustion products, with CO emissions rising from 3314.75 ppm to 11989.00 ppm and UHC emissions increasing from 490.87 ppm to 2557.44 ppm. Conversely, NOx emissions decrease from 938.59 ppm to 479.03 ppm because delayed combustion reduces the peak in-cylinder temperature and suppresses thermal NOx formation. These findings demonstrate a clear emission trade-off associated with injection timing, where reducing NOx is accompanied by increases in CO and UHC emissions. Therefore, an appropriate SOI should be selected to achieve a balanced compromise between combustion efficiency and exhaust emission performance in methane dual-fuel diesel engines.
Erosion Behavior of Cr₃C₂-NiCr Coated GH4720Li Superalloy Under Different Impact Angles and Erodent Sizes: A Finite Element Analysis Raffi Indrajati; Riki Hendra Purba; James Julian; Fitri Wahyuni; Elvi Armadani; Fathin Muhammad Mahdhudhu
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 2 (2026): In Progress
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i2.1862

Abstract

Solid particle erosion is a critical issue for turbine blade materials operating in harsh environments. This study investigates the erosion behavior of Cr₃C₂-NiCr coated GH4720Li superalloy using a three-dimensional single-particle finite element model. Silica sand particles with diameters of 0.3, 0.5, and 0.7 mm impacted the surface at 30°, 60°, and 90°, while material behavior was described by the strain-rate-dependent Cowper–Symonds model. The results show that both impact angle and particle size significantly affect stress distribution, plastic deformation, and erosion behavior. Higher impact angles and larger particles produce greater von Mises stress and effective plastic strain, with maximum values at 90° and 0.7 mm. The erosion mechanism changes from cutting at 30° to combined cutting and crater formation at 60°, and localized crater formation at 90°. The Cr₃C₂-NiCr coating improves erosion resistance by reducing stress concentration and plastic deformation through impact energy absorption and redistribution
Co-Authors Adi Winarta, Adi Agung Dwi Priono Aldi Raditya Adriansyah Bima Rakha Adhitama Bunga, Nely Toding Choirul Anam Christian Jovie Yudhananta Dyas Isnaen Ilham Elvi Armadani Elvi Armadani Elvi Armadani Elvi Armadani Fakhri Akbar Ayub Fathan Mubina Denu Fatih izzudin daffa Fitri Wahyuni Fitri Wahyuni Fitri Wahyuni Fitri Wahyuni Fitri Wahyuni Fitri Wahyuni Irsyada Ahmad Althaf Farih James Julian James Julian James Julian James Julian Lumbantoruan, Regina Natalindah Miguna Astuti Muhammad Akmal Apriansyah Efendy Muhammad Ivan Kurniawan Muhammad Izul A’dhom Nabillah Jasmine Anugrahputri Nisa, Rasya Aulia Nathania Raffi Indrajati Raffi Indrajati Rainer Samuel Fourlando Rasya Aulia Nathania Nisa Riki Hendra Purba Riki Hendra Purba Riki Hendra Purba Riki Hendra Purba Rizki Aldi Anggara Saphira Anggraita Siswanto Shadinty Azhar Sausan