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Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi
Published by Universitas Pancasila
ISSN : 26551861     EISSN : 27162923     DOI : https://doi.org/10.35814
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Industrial & Manufacturing Engineering
Jurnal ini mempublikasikan artikel ilmiah berbasis penelitian, studi kasus, articles review, rekayasa dan inovasi yang mencakup teoritis maupun praktis serta pengembangannya. Topik artikel ilmiah yang dimuat ASIIMETRIK mencakup bidang Arsitektur, Teknik Sipil, Teknik Industri, Teknik Informatika, Teknik Mesin dan Teknik Elektro.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 422 Documents
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Cover and Preface Vol. 6 No. 2, July 2024 Editor
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 6 Nomor 2 Tahun 2024
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Co-Design of Magnet-Edge One Step Slotting and Stator Dummy Slots to Reduce Cogging Torque and Unbalanced Magnetic Pull Gita Wardhana; Tajuddin Nur; Lucio Alfredo Correia; Herlina Herlina; Maria Angela Kartawijaya
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.v8i2.9703

Abstract

Low-speed wind generators require low cogging torque to ensure reliable start-up and low unbalanced magnetic pull to reduce vibration and bearing stress. This study examines a co-design approach that combines one-step magnet-edge slotting and stator dummy slots in a 24-slot/20-pole fractional-slot permanent magnet machine. Three configurations were analysed using two-dimensional finite element analysis in FEMM 4.2: the baseline model, the one-step magnet-edge slotting model, and the integrated one-step magnet-edge slotting + dummy-slot model. Cogging torque was calculated from Maxwell stress in the air gap, while unbalanced magnetic pull was evaluated through horizontal and vertical electromagnetic force components. The results show that one-step magnet-edge slotting reduces peak cogging torque by about 74.3% compared with the baseline model. The combined one-step magnet-edge slotting + dummy-slot design achieves a larger reduction of about 99.4%. This configuration also decreases unbalanced magnetic pull by approximately 92% on the X-axis and 90% on the Y-axis. When the unbalanced magnetic pull effect is included, the effective cogging-torque reduction remains about 98.9%. These findings indicate that integrating rotor-side magnet-edge slotting with stator-side permeance shaping provides an effective passive strategy for improving start-up performance and radial-force balance in low-speed permanent magnet wind generators .
Predicting Graduation Timeliness: A Multidisciplinary Study on Logistic Mobility, Psychosomatic Fatigue, and AI-Assistance Dependency among Information Systems Students Endin Fahrudin; Eko Suharyanto; Santosa Wijayanto
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.v8i2.9876

Abstract

Timely graduation is now being impacted by non-academic stressors and technology use. This study goes beyond traditional models that rely solely on administrative data by incorporating physical and psychological dimensions, specifically Logistics Mobility (distance and duration of commute), Psychosomatic Fatigue, and AI Assistant Dependence. The data of 292 final year Information Systems students was balanced using Random Over Sampler. Models were compared between Random Forest and Support Vector Machine. Psychosomatic tiredness and AI assistant Dependence was the best predictive factor of delayed graduation, particularly for students commuting more than 25 km, who show more fatigue and higher AI reliance. In terms of algorithmic performance, Random Forest achieved an exceptional accuracy of 100%, while SVM followed closely with 98.28%. The results show the importance of physical exhaustion and digital dependency to identify students at risk of delay. The study finds that a student’s environment, in addition to cognitive ability, is a factor in whether or not they graduate on time. High reliance on AI indicates burnout, underscoring the importance of hybrid mentoring and AI literacy programs, particularly for commuting students.
Analysis of Voltage Drop and Power Loss Calculations inthe Edelweiss Feeder of PT PLN (Persero) Abepura Customer Service Unit Ekawati Margaretha Ohee; Dultudes Mangopo; Suparno; Oktavianus Kati; Rombe Allo; Semuel Boron Membala; Allo Sarira Pongsapan
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.v8i2.9965

Abstract

This study evaluates the performance of the 20 kV Edelweiss feeder by analysing transformer loading, voltage drop, and technical power losses in a radial distribution network. The analysis is based on a bus-by-bus electrical model derived from feeder topology, conductor impedance, load current, power factor, and segment length data. Voltage profiles and technical losses are quantified using established three-phase power flow relationships based on Ohm’s law and Kirchhoff’s current law, enabling the assessment of cumulative voltage drop and loss propagation along the feeder. The results show that the feeder maintains a highly stable voltage profile, with a total voltage drop of 41.422 V, equivalent to approximately 0.207% of the nominal 20 kV voltage. Total active and reactive power losses are 7.3103 kW and 4.7821 kVAR, respectively, with more than 96% of these losses concentrated in Bus 2 and Bus 3. The findings demonstrate that technical losses are governed primarily by current accumulation, electrical distance, and topological position within the radial network rather than by conductor length alone. This study contributes a feeder-level understanding of how upstream current aggregation shapes voltage-drop and loss distribution, providing empirical evidence for identifying critical segments in medium-voltage radial distribution systems .
Effect of NaCl Concentration in Quenching Medium on Microstructure, Hardness, and Corrosion Behavior of AISI 4140 Steel Syaripuddin; Sopiyan; Rany Anggraini; Adi Tri Tyassmadi; Silalahi Jose Jan Filder; Muhammad Dhafa Irziansyah; Syamsuir; Ahmad Lubi; Muhammad Fatihuddin; Reza Febriano Armas; Ferry Budhi Susetyo
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.v8i2.9970

Abstract

AISI 4140 steel is widely used in engineering and marine components due to its high strength and good hardenability. However, improving hardness through heat treatment may influence the corrosion behavior of the material in chloride containing environments. This study investigates the effect of NaCl concentration as a quenching medium on the microstructure, hardness, and corrosion behavior of AISI 4140 steel. The samples were austenitized at 1000 °C for 15 minutes and quenched in NaCl solutions with concentrations of 3.5%, 7%, and 10.5%. Microstructural observations were carried out using optical microscopy after etching with 3% Nital. Hardness testing was performed using the Vickers method with a 10 kg load, while corrosion behavior was evaluated using weight loss measurements and electrochemical tests in 3.5% NaCl solution. The results show that increasing NaCl concentration produces a finer martensitic structure and increases hardness from 673 VHN at 3.5% NaCl to 762 VHN at 10.5% NaCl. However, the corrosion rate also increases from 0.3688 mmpy to 0.3990 mmpy, indicating higher electrochemical activity at the material surface. These results demonstrate a trade-off between improved hardness and reduced corrosion resistance with increasing NaCl concentration.
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 .
Effect of Low Partial Vacuum on Evaporation and Condensation Performance in a Solar Still System Irfan Maulana Yusuf; Dan Mugisidi; Oktarina Heriyani; Sofia Pinardi; Nunik Pratiwi
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.v8i2.10039

Abstract

This study investigates the effect of low partial vacuum on the evaporation and condensation performance in a solar still system. The tests were conducted using three variations: non-vacuum (101325 Pa), vacuum 1 (101313 Pa), and vacuum 2 (101309 Pa) using an exhaust system. The observed parameters included water temperature, pressure, vapor pressure difference (ΔP), evaporation mass, and condensation yield. The results showed that low partial vacuum increased the vapor pressure difference, thereby enhancing the driving force for evaporation. The highest maximum ΔP value was obtained at vacuum 2, at 1278.48 Pa. However, water temperature had a more dominant influence on total evaporation, so the highest cumulative evaporation mass was obtained under non-vacuum conditions at 8750 g due to better thermal energy retention. Meanwhile, vacuum 1 produced the highest condensation yield of 7641 g, indicating a balance between vapor formation and vapor distribution within the system. These findings suggest that the optimization of a solar still based on low partial vacuum is determined not only by an increase in vapor pressure difference but also by the system’s ability to retain thermal energy and the effectiveness of the condensation process .
Parametric Analysis of Disperse Phase Soot Transport and Mass Capture in an Ionized Diesel Exhaust Crossflow Bangbang Kurniawan; Asep; Agung Sudrajat; Dhimas Satria; Dwinanto Sukamto; Sunardi; Syarif Abdullah; Mekro Permana Pinem
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.v8i2.10063

Abstract

This study investigates the influence of applied voltage, electrode spacing, and operating duration on the collection rate of fine particulate matter (PM2.5) in a diesel engine Electrostatic Precipitator (ESP). Using a laboratory-scale ESP integrated with a diesel exhaust system, experiments were conducted at three voltage levels (1.5, 4.5, and 6.7 kV), three electrode spacings (1.5, 2.0, and 2.5 cm), and three operating durations (3, 5, and 7 min). Precipitator performance was quantified using the gravimetric method. The peak particulate collection rate reached 1.10 mg/s under optimized operating parameters (6.7 kV applied voltage, 1.5 cm electrode spacing, and a 7 min operational duration. Statistical analysis via Analysis of Variance (ANOVA) indicates that operating time is the most dominant factor governing the recorded particulate collection rate. While increasing the applied voltage and minimizing electrode spacing demonstrated clear positive physical trends in collection performance by boosting local electric field intensity, their standalone individual effects were not statistically significant at a 95% confidence level. This behaviour reveals the kinetic nature of gravimetric mass accumulation, where sufficient residence time is required to differentiate field-driven transport variances from baseline analytical thresholds. These findings provide critical baseline insights for optimizing compact, low-pressure-drop electrohydrodynamic emission controls on small-scale diesel power systems.
Experimental Study on Refuse-Derived Fuel Moisture Content and Gasification Efficiency for Sustainable Energy Putty Fauthyda Zahra Hapidzha; Damora Rhakasywi; Fahrudin; Regina N. Lumbantoruan; Fazli Iqbal Pasha; M. Reza Marista; Firmansyah
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.v8i2.10087

Abstract

This study investigates the effect of moisture content in Refuse-Derived Fuel on gasification efficiency at a Waste-to-Energy Power Plant in Surakarta. Using a fixed-bed downdraft gasifier, the research experimentally tests two MC levels of 20% and 50%. High moisture content can absorb significant thermal energy during evaporation, potentially lowering reaction temperatures and syngas quality. The primary objective is to determine the optimal moisture content that maximizes Cold Gas Efficiency and syngas heating value. Results indicate that high feedstock moisture content triggers severe thermal damping within the gasifier core. Parasitic energy consumption for water vaporization significantly suppressed internal bed temperatures (Reactor and Belly zones), thereby chemically quenching primary endothermic carbon-cracking pathways. The mean Cold Gas Efficiency plummeted from an optimized peak of 42.86% in April down to a compromised level of 28.30% in June. These findings provide critical quantitative data and demonstrate that enforcing strict mechanical pre-treatment drying to lock the input moisture threshold near 20% is thermodynamically mandatory to avoid reaction quenching and ensure commercial power-generation viability in tropical climates.
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.

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