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INDONESIA
Indonesian Journal of Engineering and Technology (INAJET)
Published by Universitas Negeri Surabaya
ISSN : -     EISSN : 26232464     DOI : http://dx.doi.org/10.26740/inajet
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Mechanical Engineering
Indonesian Journal of Engineering and Technology (INAJET) is a scientific journal that publishes peer-reviewed research papers in the fields of Engineering and Technology, both theoretical, experimental, and application studies, including: Electrical Engineering, Mechanical Engineering, Informatics, Industrial Engineering, Civil Engineering.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 130 Documents
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System Dynamics Simulation of Semi-Organic Fertilizer and Pest Management Scenarios to Enhance Sustainable Food Security in Bungur Village Amanda Dian Rahmawati; Murnawan, Hery
Indonesian Journal of Engineering and Technology (INAJET) Vol. 8 No. 1 (2025): September 2025
Publisher : Fakultas Teknik Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/inajet.v8n1.p25-32

Abstract

This study investigates agricultural sustainability and food security in Bungur Village, Nganjuk Regency, East Java, by addressing critical challenges such as an aging farming population, heavy reliance on chemical fertilizers, and recurring pest infestations. To identify key determinants, Structural Equation Modelling–Partial Least Squares (SEM–PLS) was employed, while system dynamics modeling using STELLA software was applied to simulate three alternative intervention scenarios. The simulation results demonstrate that the adoption of semi-organic fertilizers increases profit by approximately 1% (Rp106.4 million), the use of environmentally friendly pest management enhances profit by 12% (Rp117.8 million), and the combined application of both strategies yields the highest improvement, with a 16% increase (Rp122.3 million) compared to the baseline condition (Rp105.6 million per hectare annually). Model reliability was confirmed through validation tests using mean comparison error (≤5%) and variance explained (≤30%). These findings highlight that integrated interventions are effective in improving productivity, profitability, and sustainability, while also providing incentives to encourage greater youth participation in agriculture. Nonetheless, the scope of this study is limited to Bungur Village and focuses exclusively on rice, shallots, and corn, without accounting for farmer-level heterogeneity. Future studies are recommended to extend the model to wider geographical contexts and incorporate factors such as climate variability and market fluctuations.
Analysis of Fiber Orientation on the Bending Strength of Aluminium-Carbon Fiber FML Composites Audyna Naomi, Irena; Yasa Utama, Firman
Indonesian Journal of Engineering and Technology (INAJET) Vol. 8 No. 1 (2025): September 2025
Publisher : Fakultas Teknik Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/inajet.v8n1.p19-24

Abstract

One such innovation is the application of composite materials as subtitutes for conventional metals. However, pure composites exhibit poor resistance to shock loads, leading to the development of Fiber Metal Laminates (FMLs), which combine carbon fiber and aluminium sheets. This research investigates the flexural behavior of carbon fiber-reinforced FMLs with varying fiber orientations (0°, 45°, dan 90°). The study employed a quantitative approach using an experimental method to evaluate the mechanical response under bending conditions. The laminates were manufactured using the vacuum infusion process, with epoxy resin as the matrix and aluminium as laminates and core. Bending tests were conducted in accordance with ASTM D790, using a Tarno Grocki universal testing machine. The results were evaluated based on maximum flexural strenght. The results showed significant differences in bending strenght based on fiber orientation. The highest bending strenght was recorded at 0° (111.43 MPa), followed by 45° (90.92 MPa), and 90° (69.87 MPa). This research may serve as a reference for futher development of FML composites for automotive body aplications.
Development of a System Dynamics Model to Optimize Productivity and Cost Efficiency in Sustainable Agricultural Systems Devi Rahmawati Putri, Devi Rahmawati Putri; Murnawan, Hery
Indonesian Journal of Engineering and Technology (INAJET) Vol. 8 No. 1 (2025): September 2025
Publisher : Fakultas Teknik Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/inajet.v8n1.p1-9

Abstract

Sustainable agricultural systems require efficient input management to achieve optimal results in both productivity and profitability. This study aims to develop a system dynamics model to explore strategies for increasing productivity and cost efficiency in sustainable agriculture. The research was conducted in Singkalan Village, Balongbendo District, Sidoarjo Regency using STELLA software to build a simulation model. This model captures the relationship between key variables, including the use of superior crop varieties and semi-organic fertilizer, rice and corn yields, operational costs, and farmer profits. Three management scenarios were tested: (1) increasing productivity through superior varieties, (2) reducing operational costs by applying semi-organic fertilizer by 25%, and (3) combining the two approaches. The simulation results show that the combination of scenarios provides the best results, with an increase in rice productivity of 3.96%, a reduction in operational costs of 16.29%, and a profit for rice farmers of 1.27%. These results highlight the effectiveness of the system dynamics approach in assessing input-based policy interventions and supporting sustainable profit-oriented decision making in agriculture. Keywords: cost efficiency, productivity, profitability, system dynamics
Technical Analysis of Lightning Arrester Replacement to Improve Customer's Power Grid Reliability Zen, Hafidz Nindhom; Ibrohim; Baihaqi, Mochamad Faris
Indonesian Journal of Engineering and Technology (INAJET) Vol. 8 No. 1 (2025): September 2025
Publisher : Fakultas Teknik Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/inajet.v8n1.p33-40

Abstract

The reliability of the power distribution network in the tropics is particularly vulnerable to thunderstorm disturbances, which can cause asset damage and service interruptions. Lightning arrester (LA) as a primary protection component experiences performance degradation over time due to environmental factors, which has the potential to cause protection failure to thermal runaway. This study aims to conduct a technical analysis of the urgency of replacing existing LA units through a quantitative evaluation of isolation prisoners and a comparison of technical specifications with modern LA. The research methodology refers to the standard testing of insulation resistance with high DC voltage (2.5 kV - 5 kV), where values below the critical threshold of 1 Giga Ohm (GΩ) are identified as indicators of insulation failure after corrective cleaning measures are ruled out. The researchers analyzed that the value below the standard indicated a significant risk of leakage current that could trigger catastrophic failure of the Metal Oxide Varistor (MOV) block. The results of this analysis are expected to provide a strong technical justification for predictive maintenance policies, in order to improve surge protection capabilities, reduce the rate of disturbances, and ultimately strengthen the reliability of the electrical system comprehensively.
IMPROVED POWER GRID STABILITY WITH REGULAR MAINTENANCE OF MEDIUM-VOLTAGE TRANSFORMER CONNECTIONS Nisa', Silvi Nur Rakhman; Rohman, Miftahur; Baihaqi, Mochamad Faris
Indonesian Journal of Engineering and Technology (INAJET) Vol. 8 No. 1 (2025): September 2025
Publisher : Fakultas Teknik Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/inajet.v8n1.p41-49

Abstract

The power grid is a vital infrastructure that ensures the distribution of energy from the plant to the consumer. One of the important components in this network is the transformer, which regulates the voltage level as needed. In medium-voltage networks, transformer connections play a crucial role in maintaining system stability. Unmaintained connection conditions can cause disturbances in the form of decreased voltage quality, blackouts, and equipment damage. Unfortunately, connection maintenance is often done reactively, only when a fault occurs. This study aims to analyze the impact of routine maintenance of transformer connections on the stability of the power grid at PT PLN (Persero) UP3 South Surabaya – ULP Ngagel. The methods used include field observation, documentation of maintenance activities, and analysis of disturbance data before and after maintenance. The results of the study show that routine maintenance is able to reduce the frequency of connection failures, improve voltage stability, and extend the life of network components.
PID-Based Motion Control of a Differential Drive Robot: A Simulation Study in CoppeliaSim Fachruddin Ari Setiawan; Ghali Marzani; Daffa Arkana Sheva Budianto; Muhamad Julian Hadinata
Indonesian Journal of Engineering and Technology (INAJET) Vol. 8 No. 2 (2026): April 2026
Publisher : Fakultas Teknik Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/inajet.v8n2.p1-8

Abstract

Motion control is a critical aspect of mobile robot operation, particularly for differential drive robots that require precise regulation of linear and angular velocities. This paper presents the implementation of a PID-based motion control system for a differential drive mobile robot in a CoppeliaSim simulation environment. The proposed control architecture employs two independent PID controllers operating in a closed-loop configuration to regulate the robot’s linear (surge) and angular (yaw) velocities. The robot kinematic model is used to transform the controller outputs into wheel velocity commands. Several simulation scenarios with varying velocity references were conducted to evaluate the performance of the proposed approach. Controller performance was assessed using standard metrics, including transient response characteristics and Root Mean Square Error (RMSE). The simulation results demonstrate that the PID controller achieves stable tracking of the desired velocity references with low tracking errors. The obtained RMSE values of 0.01339 for linear velocity and 0.01496 for angular velocity indicate reliable motion control performance in the simulated environment. The controller performance is further characterized by its steady-state accuracy and transient response behavior during setpoint changes. These findings confirm that PID-based control remains an effective and practical solution for low-level motion control of differential drive robots and provides a solid baseline for further research and experimental validation.
Comparison of Mamdani Fuzzy Inference System Results Between MATLAB and Python Implementations Amrul Hinung Prihamayu; Qiyqiy Fithri Awamirillah
Indonesian Journal of Engineering and Technology (INAJET) Vol. 8 No. 2 (2026): April 2026
Publisher : Fakultas Teknik Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/inajet.v8n2.p9-16

Abstract

Planning in determining the amount of production decision-making for the next period depends on the remaining inventory from the previous period and also the estimated amount of demand in the next period. Total demand and supply are uncertain. Fuzzy logic is a technique to analyze uncertainty. The purpose of this study is to compare the results of a Mamdani fuzzy inference system for determining the optimal production quantity of chocolate products on two computing platforms: MATLAB and Python. Both implementations used an identical system design, consisting of the same membership functions, rule base, input-output ranges, aggregation method, and defuzzification method, and the Python implementation was executed with the Scikit-Fuzzy library on Google Colab. The test scenario used input values of production cost of Rp 800.00 per pack and product demand of 45,000 packs. MATLAB produced a crisp output of 64,100 packs, while Python resulted in 80,000 packs. This study shows an output difference of 24.8%, which is attributed to differences in numerical resolution of the universe of discourse and library-specific implementation of the aggregation and centroid defuzzification operations between the two platforms. These findings indicate that Python, using the open-source Scikit-Fuzzy library, offers an accessible and cost-effective alternative for fuzzy modeling, while careful verification of the implementation details remains necessary to ensure numerical consistency between platforms. As this comparison is based on a single test scenario, further validation using additional test cases is recommended.
THE EFFECT OF WOOD POWDER COMPOSITION AND PARTICLE SIZE ON THE ROUGHNESS OF CO₂ LASER BIOCOMPOSITES Ahmad Saepuddin; Muhammad Khoirur Roziqin
Indonesian Journal of Engineering and Technology (INAJET) Vol. 8 No. 2 (2026): April 2026
Publisher : Fakultas Teknik Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/inajet.v8n2.p26-31

Abstract

This study aims to analyze the effect of pine wood powder composition and particle size on the surface roughness of biocomposites produced by CNC CO₂ laser cutting. The research method employed was an experimental design with variations in wood powder:PVA composition of 70:30, 60:40, and 50:50, and particle sizes of mesh 60, 140, and 200. The specimens were fabricated through manual mixing without the application of pressure during molding and were tested using a surface roughness tester with five measurement points for each variation. The data were analyzed using two-way ANOVA to determine the effects of each variable and their interaction. The results showed that both composition and particle size affected the surface roughness values. The best result was obtained for specimen B3 (60:40, mesh 200) with the lowest Ra value of 8.0566 µm, while the highest value was found in specimen C3 (50:50, mesh 200) at 16.780 µm. In addition, defects such as burning, void, and incomplete cut were identified and contributed to the overall surface quality. It can be concluded that the proper combination of material composition and particle size can improve the cutting quality of biocomposite materials.
Milkfish Aquaculture System Selection in Supporting Food Security via System Dynamics Simulation Saidha Umami Suyitno
Indonesian Journal of Engineering and Technology (INAJET) Vol. 8 No. 2 (2026): April 2026
Publisher : Fakultas Teknik Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/inajet.v8n2.p17-25

Abstract

Food security related to animal protein is an important factor in supporting sustainable development, particularly through the aquaculture sector. This study aims to analyze the key factors affecting the success of milkfish aquaculture, develop a dynamic simulation model for milkfish production, and evaluate the role of the supply chain in meeting consumer demand in East Java. The research was conducted in Tambakberas Village, Cerme District, Gresik Regency, with a focus on traditional and intensive milkfish aquaculture systems. Data were collected through observation, interviews, questionnaires, and secondary data on fish production and consumption. The analysis was carried out using SEM-PLS and dynamic simulation through causal loop diagrams and stock-and-flow diagrams. The results show that milkfish production is the main factor influencing production success, with a path coefficient of 0.319, a T-statistic of 2.783, and a p-value of 0.006. The simulation results indicate that the partially intensive scenario is the most rational option because it can increase production and profit while keeping operational costs more controllable. The supply chain plays a crucial role in ensuring stock availability, smooth distribution, and stable milkfish prices.
Analysis of the Corn Supply Chain to Increase Farmers’ Profits in Napis Village Nur Faizah
Indonesian Journal of Engineering and Technology (INAJET) Vol. 8 No. 2 (2026): April 2026
Publisher : Fakultas Teknik Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/inajet.v8n2.p32-39

Abstract

Bojonegoro Regency, particularly Napis Village in Tambakrejo District, is a major corn-producing center in East Java that faces supply chain challenges such as limited access to capital, fluctuations in input costs, and low bargaining power among farmers due to their dependence on informal middlemen. This study aims to identify the factors affecting farmers’ profits, develop and validate a Dynamic Systems model based on actual data from 2021–2025, and formulate strategies for strengthening a sustainable supply chain. A combined PLS-SEM and Dynamic Systems (STELLA) approach was applied using data from 60 respondents. The PLS-SEM analysis confirmed that access to capital is the most dominant factor influencing profits (path coefficient = 0.504; T-statistic = 4.947; P-value = 0.000). Simulations of three scenarios (2026–2030) showed that the scenario involving labor substitution through the adoption of collective corn planting technology managed by Gapoktan (Scenario 3) was the best option because it reduced operating costs by Rp4.36 billion without increasing farmers’ debt burden. Gapoktan-based supply chain restructuring breaks farmers’ financial dependence on middlemen and restores farmers’ bargaining power in determining corn selling prices.

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