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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 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 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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Journal : Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi

 1 
Analisis Motor Listrik Tipe Synchronous dengan Metode Komputasi James Julian; Fitri Wahyuni; Lomo Mula Tua; Nely Toding Bunga
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa & 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 & 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.
Characterization of the Co-Flow Jet Effect as One of the Flow Control Devices James Julian; Waridho Iskandar; Fitri Wahyuni; Ferdyanto; Nely Toding Bunga
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa & 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.v4i1.3437

Abstract

The computational study discusses the application of the co-flow jet technique as a fluid flow control device on the NACA 0015 airfoil. The numerical equation used is the RANS equation with the k-ε turbulence model. There are three variations of the mesh proposed in this paper. The first variation is a fine mesh with 100,000 elements. The second variation is a medium mesh with 50,000 elements. Meanwhile, the third variation is coarse mesh with 25,000 elements. Based on the mesh independence test results, the mesh with the lowest error value is the fine mesh. Co-flow jet is proven to control fluid flow on the upper side of NACA 0015. Co-flow jet can also improve the aerodynamic performance of NACA 0015 by increasing Cl and decreasing Cd. The increase in Cl was 114% and the decrease in Cd was 24%. The fluid flow separation on the upper side of the airfoil can also be handled well by the co-flow jet.
Aerodynamic Performance Improvement on NACA 4415 Airfoil by Using Cavity James Julian; Waridho Iskandar; Fitri Wahyuni; Nely Toding Bunga
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa dan Inovasi Volume 5 Nomor 1 Tahun 2023
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v5i1.4259

Abstract

This study uses a numerical method to analyze the cavity's use on the airfoil's trailing edge and the aerodynamic effects it generates. The type of airfoil used is NACA 4415. The variations in the Reynolds number examined in this study are 2×105 and 3×105. The governing equation is the Reynolds Averaged Navier-Stokes paired with the k-ε turbulence model. This study concludes that the cavity can increase Cl in the airfoil but cannot delay the stall. The increase in Cd is also a negative effect of using a cavity in the airfoil. The cavity can increase Cl by increasing the pressure on the lower side near the trailing edge. Meanwhile, the cavity increases Cd because it creates a separation of the fluid flow, forming a vortex when viewed in a streamlined form of fluid flow.
The The Effect of Micro Geometry with Various Forms as Passive Flow Control in NACA 4415 James Julian; Rizki Aldi Anggara; Fitri Wahyuni; Nely Toding Bunga
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa dan Inovasi Volume 5 Nomor 2 Tahun 2023
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v5i2.4678

Abstract

This study investigates the effect of variations in the micro geometry with various forms as passive flow control devices on the aerodynamic capability of the airfoil. Micro-cylinder, micro-slat, and micro-cube are installed close to the leading edge of the NACA 4415 airfoil as a micro geometric variation of passive flow control devices with a predetermined diameter of 3% c located at coordinates x= 0% c and y= 8 %c of the leading edge of the airfoil. The Reynolds number used in this study is Re = with AoA variations from 0°-30°. This study's results show a decrease in Cl of 12% with a micro-cylinder, 26% with a micro-slat, and 28% with a micro-cube. In addition, the Cd produced by using the variation of the device micro geometry has increased significantly. Thus, the final result is a lift-to-drag ratio of more petite than the without micro. In the streamlined contour shown when the airfoil is at a high angle of attack, the use of micro geometric variations of passive flow control devices can have an effect that causes reduced recirculation that occurs in the airfoil. However, the impact of these devices is not optimal, resulting in a reduction in the aerodynamic capability of the NACA 4415 airfoil.
Analysis of the Use of Bio Flap on NACA 4415 with Numerical Methods James Julian; Saphira Anggraita Siswanto; Fitri Wahyuni; Nely Toding Bunga
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa dan Inovasi Volume 5 Nomor 2 Tahun 2023
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v5i2.4768

Abstract

This study was conducted using the Computational Fluid Dynamics (CFD) method using the Reynolds Averaged Navier Stokes (RANS) approach. The type of airfoil used in this study is the asymmetry NACA 4415 airfoil type. In this paper, computational tests were carried out on the airfoil with the addition of bionic flaps on its trailing edge. This study's update tests three variations of the Reynolds number: Re = 106, Re = 5 × 105, and Re = 3 × 105. The airfoil test was carried out at AoA 0°–25°. The addition of bionic flaps causes a decrease in lift performance at low AoA, but at high AoA, it can increase lift performance on airfoils. In addition, adding a bionic flap on the airfoil can delay the occurrence of a stall. At AoA 10°–13°, the Cd of the three variations of the Reynolds number experiences an increase in performance. Then, from this computational test, the resulting Coefficient moment (Cm) is a pitch down because the torque is below zero.
Investigation of Flap Dimensional Parameters to Improve Hydrodynamic Performance of Oscillating Wave Surge Converter Device Anggara, Rizki Aldi; Julian, James; Wahyuni, Fitri; Purba, Riki Hendra; Toding Bunga, Nely
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa & 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 Prabowo, Anton Dwi; Julian, James; Wahyuni, Fitri; Purba, Riki Hendra; Toding Bunga, Nely
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa & 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 Naufal, Ridwan Daris; Julian, James; Wahyuni, Fitri; Purba, Riki Hendra; Toding Bunga, Nely
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa & 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 Akmal, Reza Najmi; Julian, James; Wahyuni, Fitri; Purba, Riki Hendra; Toding Bunga, Nely
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa & 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.
Co-Authors Achmad Zuchriadi Ade Fikri Fauzi Adi Winarta, Adi Akmal, Reza Najmi Aldi Anggara, Rizki Anggara, Rizki Aldi Annastya Bagas Dewantara Anton Prabowo Armadani, Elvi Armansyah Armansyah Armansyah Armansyah Armansyah Bagas Dewantara, Annastya Billad, Rayhan Fariansyah Budiarso Budiarso, Budiarso Bunga, Nely Toding Demo Putra Demo Putra Desta Sandya Prasvita Dewantara, Annastya Bagas Dwi Yulia Handayani Faiz Daffa Ulhaq Farha, Auditya Fauzi, Ade Fikri Ferdyanto Ferdyanto, Ferdyanto Firdaus, Talitha Fatiha Fitri Wahyuni Fitri Wahyuni Fitri Wahyuni Fitri Wahyuni Gunasti, Nabilah Dwi Hadinata, Tri Hapidzha, Putty Harinaldi . I Wayan, Marlon Managi Idris Marbawi Iskandar, Waridho Junaedi, Thomas Juri Saedon Kasih Prihantoro Lomo Mula Tua Lumbantoruan, Regina Lumbantoruan, Regina Natalindah 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 Ramadhani, Rifqi Reda Rizal Revan Difitro, Revan Ridwan Daris Naufal Rifqi Ramadhani Rizki Aldi Anggara Rizki Aldi Anggara Rizki Anggara, Rizki Rudy Sutanto Saphira Anggraita Siswanto Sari, Rena Satria, Muhammad Fari Sedeq, Khalees Toding Bunga, Nely Tri Hadinata Tua, Lomo Mula Tulus Hidayat Yusanto Ulfa Hanifah Nurhaliza Ulhaq, Faiz Daffa Waridho Iskandar Waridho Iskandar Yuliana, Sekar Zackharia Rialmi