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All Journal R.E.M (Rekyasa Energi Manufaktur) Jurnal Turbo : Jurnal Program Studi Teknik Mesin JURNAL INTEGRASI JTERA (Jurnal Teknologi Rekayasa) Angkasa: Jurnal Ilmiah Bidang Teknologi Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Jurnal Bakti Masyarakat Indonesia Dinamis Logic : Jurnal Rancang Bangun Dan Teknologi Electrician : Jurnal Rekayasa dan Teknologi Elektro Jurnal Industri dan Inovasi (INVASI) Journal of Sustainable Economics Jurnal Polimesin Journal Serambi Engineering (JSE) Ulil Albab
Elvi Armadani
Universitas Pembangunan Nasional Veteran Jakarta
Religion Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation Other

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Adaptive Path Planning Using Depth-First Search in Environments with Dynamic Obstacle Ni Putu Devira Ayu Martini; Muchamad Oktaviandri; Elvi Armadani
Electrician : Jurnal Rekayasa dan Teknologi Elektro Vol. 20 No. 1 (2026)
Publisher : Department of Electrical Engineering, Faculty of Engineering, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/elc.v20n1.3002

Abstract

Depth-First Search (DFS) is one of the classical algorithms used for robotic path planning due to its simplicity and deterministic exploration strategy. However, its performance can degrade significantly in environments where obstacles move or appear unexpectedly. This study analyzes the behavior of the DFS algorithm under both static and dynamic obstacle conditions using a grid-based simulation. Three primary performance indicators were evaluated: total path length, turning complexity, and overall path efficiency. In static environments, where all obstacle positions were known beforehand, DFS demonstrated stable and efficient navigation, achieving approximately 117% shorter paths, 42% higher efficiency, and 133% fewer turning maneuvers compared to scenarios with dynamic obstacles. When unexpected obstacles were introduced, the robot frequently performed backtracking and route replanning, which increased the total travel distance and the number of directional changes, ultimately lowering navigation efficiency. Despite these challenges, the DFS algorithm was still capable of reaching the goal after multiple replanning steps. These findings highlight both the robustness and limitations of DFS and suggest that integrating adaptive sensing or hybrid algorithms could improve performance in unpredictable, dynamic environments.
The effect of flap thickness on the hydrodynamic performance of an oscillating wave surge converter James Julian; Rasya Aulia Nathania Nisa; Fitri Wahyuni; Riki Hendra Purba; Fathin Muhammad Madhudhu; Elvi Armadani
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.7682

Abstract

With the growing demand for energy and the need to transition to renewable sources, ocean wave energy presents great potential. The Oscillating Wave Surge Converter (OWSC) is a promising technology due to its nearshore applicability, structural simplicity, and robust design. This study systematically investigates the effect of flap thickness on the dynamic performance of a hinge-mounted OWSC using the Boundary Element Method (BEM).   The research models the hydrodynamic interactions and analyzes the effects of three different flap thicknesses on key metrics, including maximum angle deviation, angular velocity, torque, and power capture. The results indicate that all flap variations demonstrate stable oscillatory movement, but greater flap thickness reduces the maximum angle deviation due to increased inertia and hydrostatic pressure. A resonant peak was observed for all thicknesses at a wave period of 1.3 seconds, where energy transfer was maximized. At this frequency, the thickest flap achieved the highest efficiency (78.94%), followed by the intermediate (77.50%) and thinnest (70.77%) variations. The findings suggest that while flap thickness influences efficiency, the primary factor for maximizing energy capture is the alignment of the wave period with the device's natural frequency.
Numerical investigation of heat reduction system in 42110 Lithium-Ion battery packs using cooling plate spacing variations Bima Rakha Adhitama; James Julian; Fitri Wahyuni; Fathin Muhammad Madhudhu; Elvi Armadani
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.7692

Abstract

An efficient thermal reduction system is crucial for ensuring the optimal performance and safety of Electric Vehicle (EV) batteries, notably by maintaining uniform temperature distribution and minimizing the risk of thermal runaway. This study presents a numerical investigation of the thermal behaviour of a liquid-cooled system for a cylindrical Li-ion 42110 battery pack, focusing on the influence of varying cold-plate spacing. Three cold plate configurations with spacing ratios r = 0.78, r = 0.33, and r = 0 were examined, with r = 0.78 corresponding to the most significant separation. The simulation employed a Reynolds-Averaged Navier–Stokes (RANS) model to resolve fluid flow and energy transport, and the heat-generation profile was derived from experimental data. The results show that all cooling configurations substantially reduced the maximum temperature relative to the uncooled case, with the widest spacing (r = 0.78) achieving the most significant average reduction of 19.736%. However, designs with smaller spacing exhibited slightly higher temperatures and reduced uniformity, particularly near the positive pole, where heat concentration is more pronounced. The temperature deviation remained within the acceptable 2% threshold. These findings highlight not only the thermal effectiveness of each spacing ratio but also its design implications, demonstrating that spacing plays a critical role in controlling peak temperature and maintaining uniformity. Overall, the study emphasizes that strategic cold-plate spacing is essential for reliable, efficient, and thermally stable battery operation in EV applications.
THE EFFECT OF OFFSET RATIO ON OFFSET JET FLOW STRUCTURE Rifqi Ramadhani; James Julian; Fitri Wahyuni; Riki Hendra Purba; Fathin Muhammad Madhudhu; Elvi Armadani
TURBO [Tulisan Riset Berbasis Online] Vol 14 No 2 (2025): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v14i2.4538

Abstract

Jet flow is a crucial fluid dynamic phenomenon that has been extensively studied. It is essential for various industrial applications, including surface cleaning, flow control, and cooling electronic components.  Offset jet is an innovation in jet flow configuration that offers advantages in flow pattern control by expanding the impingement area and regulating surface pressure distribution. This study employed a Computational Fluid Dynamics (CFD) approach to investigate the influence of variations in the offset jet ratio on the aerodynamic characteristics of the flow, specifically the impingement zone area, pressure coefficient distribution, and skin friction coefficient. The standard k-ε turbulence model, utilizing a structured mesh and a Reynolds number of 10,000, was employed in this research. The number of mesh elements used was a fine mesh of 200,000 with an error percentage of 0.09436%. The results of the study show that an offset ratio of 3 produces the highest cf value of 0.0047 and a stable Cp distribution of 0.218, while also providing the best impingement zone area. These findings indicate that OR 3 is the most optimal configuration in terms of aerodynamics for precision system applications, with a focus on flow pattern control and wide impingement zone coverage.
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.
Co-Authors Abdillah, Zaki Adi Winarta, Adi Aldi Raditya Adriansyah Alek Topan Lubis Anggie Topan Wijaya Arieviana Ayu Laksmi Bima Rakha Adhitama Bima Rakha Adhitama Bunga, Nely Toding Chindy Elsanna Revadi Christian Jovie Yudhananta Daniel Jeffry Deva Ihsan Khoirunas Dian Fajarika, Dian Fathin Madhudhu Fathin Muhammad Madhudhu Fathin Muhammad Mardhudhu Fitri Wahyuni Fitri Wahyuni Fitri Wahyuni Fitri Wahyuni Hersa Dwi Yanuarso Hilmana Radhia Putera James Julian James Julian James Julian Juniwati Juniwati Lumbantoruan, Regina Natalindah M Zaky Hadi Madhudhu, Fathin Muhammad Mahdhudhu, Fathin Muhammad MARTINI, NI PUTU DEVIRA AYU Muchamad Oktaviandri Muhammad As’adi Nisa, Rasya Aulia Nathania Raffi Indrajati Ragil Alghifari Sendin Rainer Samuel Fourlando Ramadhani, Rifqi Rasya Aulia Nathania Nisa Rasya Aulia Nathania Nisa Revadi, Chindy E Rifqi Ramadhani Riki Hendra Purba Riki Purba Rizki Aldi Anggara Rizqi Wahyudi Saphira Anggraita Siswanto Siregar, Lina Sari Siswanto, Saphira Anggraita Situmorang, Riky Stepanus Tarigan, Andre Otniel Yulizar Widiatama