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All Journal International Journal of Electrical and Computer Engineering IAES International Journal of Artificial Intelligence (IJ-AI) Media Statistika Jurnal Ilmiah Teknologi dan Rekayasa ELKHA : Jurnal Teknik Elektro Jurnal Teknologi Rekayasa Mesin Media Mesin: Majalah Teknik Mesin Jurnal Rekayasa Mesin Turbo : Jurnal Program Studi Teknik Mesin Journal of Energy, Mechanical, Material and Manufacturing Engineering JTERA (Jurnal Teknologi Rekayasa) Angkasa: Jurnal Ilmiah Bidang Teknologi Jurnal Kreativitas PKM TELKA - Telekomunikasi, Elektronika, Komputasi dan Kontrol Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan Infotekmesin Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Journal of Applied Sciences and Advanced Technology International Journal of Marine Engineering Innovation and Research Jurnal Bakti Masyarakat Indonesia Teknosains : Jurnal Sains,Teknologi dan Informatika jurnal syntax admiration Madaniya Journal of Community Development Logic : Jurnal Rancang Bangun Dan Teknologi Jurnal INFOTEL Jurnal Keamanan Nasional ABDIKOM Jurnal Polimesin
James Julian
Department Of Mechanical Engineering, Faculty Of Engineering, Universitas Pembangunan Nasional Veteran Jakarta
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Investigation of Flap Dimensional Parameters to Improve Hydrodynamic Performance of Oscillating Wave Surge Converter Device Rizki Aldi Anggara; James Julian; Fitri Wahyuni; Riki Hendra Purba; Nely Toding Bunga
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 7 Number 1 (2025)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v7i1.7911

Abstract

Renewable energy transition is a strategic step in overcoming environmental damage due to fossil fuel exploitation. Ocean wave energy comes with its popularity, considering its advantages in supplying energy continuously and having high energy density. Therefore, technology that can extract other wave energy effectively and efficiently is needed. This study focuses on identification flap geometry to improve the oscillating wave surge converter (OWSC) hydrodynamic performance. Through a numerical approach, the Boundary Element Method (BEM) is applied in three-dimensional flap modeling to accommodate testing the characteristics and performance of the OWSC device. This study identified five different samples: geometry 1, geometry 2, geometry 3, geometry 4, and geometry 5. The results show that the second geometry variation is the most optimal flap dimension parameter. The best proportion is found in the dimensional characteristics parallel to the elevation of the ocean waves to maximize the output torque. Overall, the second geometry performs satisfactorily with an average maximum power achievement of 41.52 Watts at a wave period of T = 1.5s. In addition, the OWSC device with this variation can work at an expansive wave period interval with a maximum CWR efficiency achievement of up to 52.14%.
The Effect of Hydrostatic Pressure on the Performance of Oscillating Wave Surge Converter Anton Dwi Prabowo; James Julian; Fitri Wahyuni; Riki Hendra Purba; Nely Toding Bunga
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 7 Number 1 (2025)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v7i1.7912

Abstract

The latest energy demand increasingly drives innovation in ocean wave energy technology, including the Oscillating Wave Surge Converter (OWSC). This consider analyzes the impact of water profundity varieties on the execution of OWSCs put on the seabed. The study was conducted numerically using the Boundary Element Method by testing four variations of air depth at wave periods between 1.2 and 2.8 seconds and wave amplitudes of 0.1 meters. The results show that the optimal depth, equivalent to the flap height (D2), produces the highest maximum displacement due to the balance between hydrostatic pressure and wave energy the flap receives. Conversely, depths that are too shallow (D1) or too deep (D4) result in smaller displacements due to the instability of the movement in shallow air and the attenuation of wave energy in deep air. In addition, more extended wave periods tend to decrease the changing cycle frequency but increase the symmetry of the flap movement at a certain depth.
Utilization of Single and Double Orifice Plates in Pipe Inner Flow Structure by Computational Method Ridwan Daris Naufal; James Julian; Fitri Wahyuni; Riki Hendra Purba; Nely Toding Bunga
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 7 Number 1 (2025)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v7i1.7913

Abstract

The orifice plate is a device that disrupts the flow in the pipe. The disturbed flow results in the formation of flow structures. The flow structure formed can be utilized for several applications such as multi-fluid mixing and microbubble generator. Using orifice plates to utilize the flow structure results in more significant pressure loss. This study aims to identify the characteristics of the flow structure generated by single and double orifice plates with 1D and 2D spacing at various Reynolds numbers, namely Re = 1×104, 5×104, 1×105, and 5×105, as a basis for application in these various applications. The results show that single and double orifice plates can produce flow structure phenomena such as recirculation and vortex regions. The recirculation area is formed smaller in the double orifice plate due to the flow that is separated faster to converge back to the pipe wall but broader so that the flow of the orifice plate is narrower. Increasing the applied Reynold's number causes the separated flow to reconnect to the pipe wall faster, resulting in a smaller recirculation area. Double orifice plates are more suitable for applications that require a certain degree of mixing or pressure distribution, but with a consequent more significant pressure loss. Meanwhile, single plates can be used for simple needs with little pressure loss.
The Analysis of Banana Slices Machine Frame Using Computational Method Reza Najmi Akmal; James Julian; Fitri Wahyuni; Riki Hendra Purba; Nely Toding Bunga
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 7 Number 1 (2025)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v7i1.7914

Abstract

The culinary industry, especially banana chip processing, dramatically supports the economy of micro and small enterprises (MSMEs) in Indonesia. However, the traditional process is time-consuming, especially at the cutting stage. The banana-slicing machine is designed to speed up this process with consistent and efficient cuts. This study analyzes the performance of the banana-slicing machine frame by testing variations in loading (20 N to 200 N) and frame materials, namely Low Alloy Steel, Structural Steel, Stainless Steel, Aluminum Alloy, and Cast Iron, to determine the optimal material. The results showed that Low Alloy Steel is the best material because it has the lowest total deformation, equivalent stress, and strain energy, reflecting high stiffness and load efficiency. With an elastic modulus of 212.5 GPa and an economical price ($1.3–1.5/kg), this material offers the best balance in terms of technical and economics. Structural steel also performed well but was slightly lower than low alloy steel. In contrast, Aluminum Alloy has the highest deformation and strain energy, making it less suitable for this application. Overall, Low Alloy Steel is an ideal choice to improve the efficiency and reliability of the banana-slicing machine.
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.
Analisis Motor Listrik Tipe Synchronous dengan Metode Komputasi James Julian; Fitri Wahyuni; Lomo Mula Tua; Nely Toding Bunga
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 3 Nomor 1 Tahun 2021
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v3i1.1879

Abstract

In the current technological development, the electric motor is the most popular in various industrial applications. Electric motors today have evolved very quickly and have a significant impact on the lives of the wider community. The use of environmentally friendly and efficient energy is one of the reasons why this motorbike has become a pioneer of technological advances, especially in the automotive world. This research focuses on conducting a comprehensive analytical study on one type of electric motor, namely synchronous because it is widely applied in various conditions today. The analysis was carried out using a computational method by applying the finite element as a method of solving the magnetic field case involving Maxwell's equations and its impact on the torque generated in this synchronous motor. From the computation results, it is found that this synchronous motor does have a high torque when the magnetic field flux works constantly at 0.015 Wb. With an average torque generated by this synchronous motor of 1.5 kW.
Karakteristik Kekerasan Lasan Titik Gesekan dan Pengadukan pada Paduan Aluminium 5052-H112 Armansyah; Juri Saedon; Ferdyanto; Nely Toding Bunga; James Julian
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 4 Nomor 2 Tahun 2022
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v4i1.3183

Abstract

Issues in friction stir spot welding focus mainly on the mechanical characteristic affected by its Hardness. This Hardness must be maintained by evenly temperature distribution in weld zones during welding. The process parameters are mainly responsible for the development of the hardness of the friction stir spot weld. This study presented the hardness evaluations on the friction stir spot weld via the Hardness-Vickers test and analysis of the temperature distribution in the weld zones via the finite element method. The workpiece samples used in this study were Aluminium alloy 5052-H112 with a thickness of 2 millimeters in the lap-shear mode based on 3 main parameters at low and high levels of parameters configuration. The results obtained via the Hardness-Vickers tests exhibited a value of 42-HV located in the middle of the spot-weld center using a low-level parameters configuration. This value increased to 64-HV around the vicinity of the keyhole. And then the value decreased to 53-HV outside the keyhole, about 6 millimeters from the spot-weld center. Using high-level parameter configuration, the Hardness-Vickers value increased to 61-HV in the middle of the spot-weld center. The value then increased to 76-HV in the vicinity of the keyhole. Furthermore, the value decreased at 60-HV outside the keyhole, which ca 6 millimeters away from the spot-weld center. The temperature distribution of the weld zones achieved 480 oC in the vicinity of the keyhole using the low-level parameter configuration. Slowly, the temperature declined to 380 oC at 6 mm away from the friction spot-weld center in the HAZ. Using the high-level parameters configuration, the temperature distribution reached 540 oC in SZ, and slowly reduced to 425 oC in HAZ. Based on the results, it was found that by using high-level parameters configuration the hardness of the friction stirs spot weld exhibited better Hardness-Vickers value and evenly temperature distribution in the weld zones.
Co-Authors Achmad Zuchriadi Ade Fikri Fauzi Adhitama, Bima Rakha Adi Winarta, Adi Akmal, Reza Najmi Aldi Anggara, Rizki Anggara, Rizki Aldi Anggie Topan Wijaya Annastya Bagas Dewantara Anton Dwi Prabowo Anton Prabowo Armadani, Elvi Wijaya Armansyah Armansyah Armansyah Armansyah Armansyah Bagas Dewantara, Annastya Billad, Rayhan Fariansyah Budiarso Budiarso, Budiarso Bunga, Nely Toding Christian Jovie Yudhananta Demo Putra Demo Putra Desta Sandya Prasvita Deva Ihsan Khoirunas Dewantara, Annastya Bagas Dwi Yulia Handayani Elvi Armadani Elvi Armadani Elvi Armadani Elvi Ermadani Ermadani, Elvi Faiz Daffa Ulhaq Farha, Auditya Fathin Madhudhu Fathin Muhammad Mahdhudhu Fathin Muhammad Mahdhudhu Fauzi, Ade Fikri Ferdyanto Ferdyanto, Ferdyanto Firdaus, Talitha Fatiha Fitri Wahyuni Fitri Wahyuni Fitri Wahyuni Fitri Wahyuni Fourlando, Rainer Samuel Gunasti, Nabilah Dwi Hadinata, Tri Hapidzha, Putty Harinaldi . I Wayan Marlon Managi I Wayan, Marlon Managi Idris Marbawi Iskandar, Waridho Junaedi, Thomas Juri Saedon Kasih Prihantoro Lomo Mula Tua Lumbantoruan, Regina Lumbantoruan, Regina Natalindah Madhudhu, Fathin Muhammad Mahdhudhu, Fathin Muhammad Marbawi, Idris Miftahul Jannah Mirza Fauzan Lukiano Mufti Ahmad Fadilah Nandy Putra Naufal, Ridwan Daris Nisa, Rasya Aulia Nathania Nisa, Raysa Oktavia, Nana Triana Parker Stefan, Parker Patrick, Juan Prabowo, Anton Dwi Prakoso, Lukman Yudho Prasetyo, Eko Andi Purba, Riki Hendra Putty Fauthyda Zahra Hapidzha Raffi Indrajati Rainer Samuel Fourlando Ramadhani, Rifqi Rasya Aulia Nathania Nisa Reda Rizal Revan Difitro, Revan Reza Najmi Akmal Ridwan Daris Naufal Ridwan Daris Naufal Rifqi Ramadhani Riki Hendra Purba Riki Hendra Purba Riki Purba Rivai, Mokhammad Bahtiar Rizki Aldi Anggara Rizki Aldi Anggara Rizki Anggara, Rizki Rudy Sutanto Saphira Anggraita Siswanto Sari, Rena Satria, Muhammad Fari Sedeq, Khalees Siswanto, Saphira Anggraita Toding Bunga, Nely Topan, Anggie Wijaya Tri Hadinata Tua, Lomo Mula Tulus Hidayat Yusanto Ulfa Hanifah Nurhaliza Ulhaq, Faiz Daffa Waridho Iskandar Waridho Iskandar Yuliana, Sekar Zackharia Rialmi