Article Per Year (5 Year)
p-Index From 2021 - 2026
1.152
P-Index
This Author published in this journals
All Journal JURNAL PASTI (PENELITIAN DAN APLIKASI SISTEM DAN TEKNIK INDUSTRI) Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Jurnal Ilmiah Teknik Mesin Poros IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA)
Abrar Riza
Universitas Tarumanagara
Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

Published : 6 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 6 Documents
Search

 1 
Optimasi Parameter 3D Printing Terhadap Kualitas Produk Bahan Acrylonitrile Butadiene Styrene Sobron Yamin Lubis; Abrar Riza; Alvian Hartanto Wijaya; Silvi Ariyanti
Jurnal PASTI (Penelitian dan Aplikasi Sistem dan Teknik Industri) Vol 17, No 1 (2023): Jurnal PASTI
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/pasti.2023.v17i1.006

Abstract

Sebelum produk dibuat dalam jumlah massal, maka terlebih dahulu dibuat protoype, pembuatan prototype cepat (rapid prototyping) dapat dilakukan dengan 3D printing. Adalah penting untuk menghasilkan kondisi permukaan yang baik yaitu nilai kekasaran permukaan yang kecil menunjukkan kondisi permukaan benda kerja adalah baik. Pada proses 3D printing terdapat tiga parameter proses yang mempengaruhi kondisi permukaan benda kerja tersebut yaitu kecepatan cetak, temperatur  dan tebal layer. Untuk menghasilkan nilai kekasaran permukaan yang baik maka harus dapat ditentukan kombinasi parameter proses 3D printing yang optimal. Berdasarkan hal tersebut maka penelitian ini dilakukan. Penelitian dilakukan dengan metode ekseperimental. Percobaan dilakukan menggunakan mesin 3D printing, dan bahan yang digunakan sebagai filamen adalah Acrylonitrile Butadiene Styrene (ABS). Model didesain menggunakan software fusion 360 berbentuk sebuah piston. Eksperimen ini dilakukan dengan variasi parameter proses yaitu kecepatan printing 60,70, dan 80 mm/s, temperatur 240,250 dan 260 oC, dan tebal layer 0,1, 0,2, dan 0,3 mm.Untuk setiap hasil proses 3D printing dilakukan pengukuran kekasaran permukaan menggunakan surface roughness test. Nilai yang dihasilkan kemudian dianalisis dengan metode Taguchi. Hasil yang diperoleh yaitu kombinasi parameter proses 3D pada  kecepatan pencetakan 60mm/s, temperatur pencetakan 240 °C, dan tebal layer 0.1 mm.
ANALISA KARAKTERISTIK TUNGKU GASIFIER TIPE FIX-BED MENGGUNAKAN METODE COMPUTATIONAL FLUID DYNAMICS (CFD) Cheko Sylvester Paat; Abrar Riza; Steven Darmawan
POROS Vol. 18 No. 2 (2022): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/poros.v18i2.20142

Abstract

Salah satu sumber energi alternatif yang murah dan mudah didapatkan adalah biomassa. Salah satu teknolgi yang bisa memanfaatkan sumber energi biomassa adalah dengan menggunakan teknologi gasifikasi. Proses gasifikasi terjadi di dalam reaktor gasifier dan menghasilkan syn-gas. Pada penelitian sebelumnya telah dilakukan penelitian eksperimental mengenai proses gasifikasi menggunakan tungku tipe fix-bed gasifier dengan menggunakan biomassa kayu dengan massa 1 kg dan 1.5 kg dan didapatkan bahwa proses gasifikasi tidak terjadi disebabkan karena suplai udara yang berlebihan. Tujuan dari penelitian ini adalah untuk mendapatkan karakteristik dari proses gasifikasi dengan menggunakan metode CFD terhadap parameter fraksi massa dari gas syn-gas (CO, H2, dan CH4) beserta distribusi temperatur dalam tungku gasifikasi. Simulasi dilakukan dengan menggunakan software ANSYS FLUENT. Dari hasil simulasi menggunakan variasi bahan bakar 1 kg dan 1.5 kg dengan variasi kecepatan inlet udara sebesar 1.5 m/s, 2.5 m/s, 3.5 m/s. Didapatkan bahwa kadar syngas paling tinggi ada pada variasi kecepatan inlet udara 1.5 m/s, dimana presentase gas syngas pada variasi kecepatan ini pada massa bahan bakar 1 kg dan 1.5 kg masing-masing adalah 36.645% dan 41.178 % dengan nilai Equivalence ratio adalah sebesar 0.23 dan 0.153
Performance Analysis of Single Cylinder Diesel Engine with 2EHN Cetane Number Enhancer on Biodiesel Kristofer Severiano Dinata; Steven Darmawan; Abrar Riza
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.v8i1.8905

Abstract

Diesel engines remain a critical technology across multiple sectors, including transportation, industry, marine, and agriculture, due to their well-known benefits such as high fuel efficiency, robust durability, and superior torque output. Even as electric vehicle technology rapidly advances, diesel engines continue to be utilized in demanding applications that require reliable, high-power performance under harsh conditions. This enduring relevance stems from their higher thermal efficiency and remarkable ability to function in extreme environments. However, diesel fuel differs from petrol in its combustion characteristics, notably having a lower combustion rate. This rate is measured by the cetane number, with higher cetane values indicating better combustion quality. To optimize engine performance, especially when using lower-cetane diesel fuel, additives are often used to increase the cetane number. This study explores the effects of combining 2-ethylhexyl nitrate, a cetane number enhancer, with Pertamina’s biodiesel product, bio solar. Using a single-cylinder diesel engine and a prony brake for testing, the study found that a 1:100 ratio of CNE to fuel delivered the best results among all mixtures. This blend achieved the highest thermal efficiency at 30.23% and recorded the lowest brake specific fuel consumption at 7.78265E-05 kg/kWh.
Performance Analysis of Single Cylinder Diesel Engine on Biodiesel Fuel Temperature Variation Erwin Pratama; Abrar Riza; Steven Darmawan
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.v8i1.8908

Abstract

The use of biodiesel or bio solar fuel continues to grow in line with the increasing awareness of renewable energy and environmental concerns. However, the relatively high viscosity of bio solar fuel can affect the performance of diesel engines. This study aims to analyze the effects of fuel temperature variation using a heater on the performance of diesel engines. The research method employed was experimental testing on a single cylinder Jiangdong 170F diesel engine with fuel heating set at temperatures 40oC, 50oC, 60oC, and 70oC. The parameters analyzed include power, torque, fuel flow rate, thermal efficiency, and Brake Specific Fuel Consumption. The test results show that at a temperature of 50oC, the engine produced the highest power and torque at a rotational speed of 2600 rpm with a torque of 6.2 Nm and power output of 1.68 kW. At temperatures of 70oC the highest thermal efficiency was observed along with reductions in fuel consumption and BSFC at the same engine speed, yielding a thermal efficiency of 34.04%, a fuel consumption rate of 1.128×10-5 kg/s and a BSFC of 6.912×10-5 g/kWh. These results suggest that a temperature of 50oC is recommended for achieving high power and torque at high speeds, while temperature 70oC is recommended for attaining high thermal efficiency and lower fuel consumption at high engine speeds.
Analisis Perilaku Termal dan Kapasitas Panas Mata Pahat Uncoated dan Coated Carbide pada Proses Pemotongan Besi Tuang M. Sobron Yamin Lubis; Abrar Riza; Han Han; Nathan Ferdiantino Hidayat
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 1 (2025): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i1.181

Abstract

During turning, most energy is converted into heat, which spreads to the cutting tool, chips, and workpiece. Heat transfer occurs via conduction and can cause tool wear. To reduce this, coatings with low thermal conductivity are used. This study aims to analyze heat absorption and heat capacity of uncoated carbide and TiCN + Al₂O₃ + TiN coated carbide tools during cast iron turning. Tests were conducted at 160, 210, and 260 m/min cutting speeds. Temperatures were measured using a K-type thermocouple placed at the tooltip. Results show the coating effectively reduces heat penetration into the tool. The coated carbide required 64.5 J/K for a 1 K temperature rise, while the uncoated only needed 1.5 J/K. This indicates uncoated tools heat up faster and wear more quickly.
Flow Distribution Analysis in a Multi Inlet Gas Manifold Using Computational Fluid Dynamics Jerico Justin; Abrar Riza; Steven Darmawan
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.v8i2.10027

Abstract

Manifolds are crucial components in various industries, particularly in oil and gas, agriculture, and energy distribution, where they function to combine fluid flow from multiple pathways into a single header pipe. Achieving uniform flow distribution is essential for maintaining system efficiency and reliability. However, non-uniform flow distribution frequently occurs due to differences in flow resistance, system geometry, and inter-stream interactions at each junction. To address the limitations of simplified analytical approaches such as the Bernoulli equation, which does not simultaneously accommodate viscosity, turbulence, and compressibility effects, a numerical approach based on Computational Fluid Dynamics was employed. This study aims to analyze the flow distribution characteristics, including velocity, pressure, and mass flow rate, in a seven inlet collector manifold, while comparing simulation results with the Bernoulli equation prediction and demonstrating consistency with the governing Navier–Stokes framework. Simulations were conducted in three dimensions using ANSYS Fluent with the SST k-ω turbulence model and the Peng–Robinson real gas model for methane at 136 bar and 70°C. Results revealed progressive flow maldistribution, with velocity increasing from 50 m/s at the inlets to 73.94 m/s at the outlet, accompanied by a total pressure drop of approximately 542 kPa. Density–velocity and density–total pressure correlations exhibited non-linear interdependencies consistent with the Navier–Stokes equations, confirming the significant roles of viscosity, turbulence, and compressibility effects within the system .
Co-Authors Alvian Hartanto Wijaya Cheko Sylvester Paat Erwin Pratama Han Han Jerico Justin Kristofer Severiano Dinata Nathan Ferdiantino Hidayat Silvi Ariyanti Sobron Lubis Sobron Yamin Lubis Steven Darmawan