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All Journal R.E.M (Rekyasa Energi Manufaktur) Jurnal Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi International Journal of Marine Engineering Innovation and Research 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 Pembanguan Nasional Veteran Jakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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Journal : applied science and technology on naval engineering

 1 
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.
Co-Authors Adi Winarta, Adi Adilia Apriliana 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 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 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 Riki Hendra Purba Rizki Aldi Anggara Saphira Anggraita Siswanto Shadinty Azhar Sausan Shirad Riezky Ilahi