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Firman Yasa Utama
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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 6 Documents
 1 
Search results for , issue "Vol. 8 No. 1 (2025): September 2025" : 6 Documents clear
Analysis of Feeding, Drinking and Automatic Fecal Cleaning in Quail Cages Based on The Internet of Things Nur Rohman, Muhammad; Mahendra Sakti, Arya; Riandadari, Dyah; Nugroho, Aji
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.p10-18

Abstract

Analyze the effect of the slope of the feeding valve on the consumption of quail feed to determine the optimal angle of inclination, evaluate the effect of the variation in the diameter of the timing pulley on the conveyor belt on the rotation speed and cleaning time of the cage manure to find the most effective pulley size, and study the effect of liquid viscosity on the filling time of the tank using a water pump in order to optimize the liquid filling system in the farm. An applied experimental method with a quantitative approach was used to test the influence of free variables. The data collected including feed consumption, fecal cleaning time, and drinking water filling time were analyzed numerically to obtain valid and objective results. The results showed that increasing the tilt of the feeding valve from 20°, 25°, to 30° increased feed consumption from an average of 348 grams to 725 grams. The timing diameter of the pulley has an effect on the rotational speed and cleaning time, with the small pulley (25 mm) resulting in the fastest cleaning (0.42 minutes) and the largest pulley (50 mm) the slowest (1.38). In addition, the viscosity of the liquid affects the filling time of the 10-liter tank, where ordinary water is the fastest (3.52 minutes), water with 5 vitamins is slightly longer, and the mixture of water with molasses and salt is the slowest (4.31 minutes). 
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.

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