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Bulletin of Engineering Science, Technology and Industry
Published by PT. RADJA INTERCONTINENTAL PUBLISHING
ISSN : -     EISSN : 30255821     DOI : https://doi.org/10.59733/besti
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering
Bulletin of Engineering Science, Technology and Industry | ISSN: 3025-5821 is a peer-reviewed journal that publishes popular articles in the fields of Engineering, Technology and Industrial Science. This journal is published 4 times a year, namely in March, June, September and December. We invite scientists, practitioners, researchers, lecturers and students from various countries and institutions to contribute to publishing their work and research results in the fields of Engineering, Technology and Industry.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 177 Documents
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REINFORCED CONCRETE STRUCTURAL CAPACITY ASSESSMENT OF SWADAYA GUNUNG JATI UNIVERSITY MAIN CAMPUS USING NON-DESTRUCTIVE TESTING Fajri Nurulfikri; Fathur Rohman Robandi
Bulletin of Engineering Science, Technology and Industry Vol. 4 No. 3 (2026): September
Publisher : PT. Radja Intercontinental Publishing

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Abstract

The degradation of structural capacity due to the age of the building is an important issue that requires periodic evaluation, especially in public facility buildings that are actively operating such as the Faculty of Economics and Business (FEB) Building of Swadaya Gunung Jati University. This study aims to assess the capacity of the reinforced concrete structure of the building through a forensic audit based on the Non-Destructive Test (NDT) method, without physically damaging the building. The methods used include visual inspection for crack pattern identification, Schmidt Rebound Hammer (ASTM C805) testing for estimation of concrete surface compressive strength, and Ultrasonic Pulse Velocity (ASTM C597) for concrete internal integrity evaluation, followed by Pearson correlation analysis and validation using software modeling referring to SNI 2847:2019, SNI 1727:2020, and SNI 1726:2019. The results of visual inspection at 120 column points showed damage in the form of non-structural hair cracks with a maximum width of 0.2 cm. Schmidt Hammer testing yielded an estimated f'c of 40 MPa (78%) and 36 MPa (22%), while the UPV showed 77.50% of the elements in the category of Good, 21.67% Doubtful, and 0.83% Poor. The Pearson correlation between the two methods was relatively weak (r = 0.399), confirming the importance of the combination of NDT methods. ETABS analysis validates that all column elements have a Demand/Capacity ratio below the critical limit, so the structure is declared safe and functional.
OPTIMIZATION OF FACE MILLING PARAMETERS IN GREEN MACHINING USING THE TAGUCHI METHOD Junid Amrullah; Muhammmad Yanis
Bulletin of Engineering Science, Technology and Industry Vol. 4 No. 3 (2026): September
Publisher : PT. Radja Intercontinental Publishing

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Abstract

Green machining has become an important manufacturing approach for reducing environmental impacts while maintaining machining performance. Minimum Quantity Lubrication (MQL) using biodegradable coconut oil offers an effective alternative to conventional flood cooling by minimizing cutting fluid consumption while ensuring adequate lubrication. This study optimizes face milling parameters of S45C medium-carbon steel under coconut oil-based MQL using the Taguchi method. Experiments were conducted on a conventional milling machine with a 10 mm four-flute carbide end mill. Cutting speed (16.33, 22.45, and 31.09 m/min), feed per tooth (0.042, 0.061, and 0.090 mm/tooth), and axial depth of cut (0.5, 0.8, and 1.2 mm) were arranged using a Taguchi L27 orthogonal array. Surface roughness (Ra) was analyzed using the Smaller-the-Better Signal-to-Noise ratio and Analysis of Variance (ANOVA). The optimum parameters were cutting speed = 31.09 m/min, feed per tooth = 0.042 mm/tooth, and axial depth of cut = 0.5 mm, yielding the highest S/N ratio despite not producing the lowest experimental Ra, indicating the most robust condition. ANOVA showed feed per tooth as the most influential factor (39.42%), followed by cutting speed (11.39%) and axial depth of cut (4.87%). These findings confirm that coconut oil-based MQL enhances surface quality and supports sustainable machining.
THE EFFECT OF TILT ANGLE AND MOUNTING HEIGHT ON BIFACIAL GAIN AND ANNUAL ENERGY YIELD OF A ROOFTOP BIFACIAL PV SYSTEM: A PVSYST PARAMETRIC ANALYSIS IN THE HUMID TROPICAL CLIMATE OF SOUTH SULAWESI Heriani; Muhammad Iqbal Nikmatullah
Bulletin of Engineering Science, Technology and Industry Vol. 4 No. 3 (2026): September
Publisher : PT. Radja Intercontinental Publishing

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Abstract

Bifacial photovoltaic (PV) modules capture solar irradiance on both front and rear surfaces, with the rear-side contribution quantified as bifacial gain (BG), highly sensitive to tilt angle and mounting height above the roof surface. A systematic simulation study simultaneously varying both parameters for the humid tropical climate of South Sulawesi, Indonesia has not been found in publicly indexed databases (Google Scholar, Scopus, SINTA, Garuda, Neliti; last searched 10 June 2025). This study presents a parametric simulation dataset through 20 PVsyst 7.3.1 variants combining five tilt angles (5–25°) with four mounting heights (0.30–1.00 m) for a 10.8 kWp grid-connected bifacial rooftop system (5.2334°S, 119.5047°E; GHI = 1,855 kWh/m²/yr). Results show tilt 10° consistently maximizes annual energy yield (E_grid) across all heights, consistent with low-latitude theory and field measurements by Khoo et al. (2014), peaking at 17,631 kWh/yr (PR = 0.871; BG = 8.0%) at H = 1.00 m. Albedo sensitivity analysis shows BG ranging 6.1–10.2% across albedo 0.15–0.30, with a disproportionate +2.2 pp increase at the 0.25→0.30 step, consistent with the nonlinear albedo–BG relationship reported by Deline et al. (2020), though the underlying mechanism requires field confirmation. This study is a simulation-based parametric analysis without on-site field validation, a limitation stated explicitly throughout; results should not be treated as experimentally validated values.
EXPERIMENTAL STUDY ON THE EFFECT OF CHEMICAL ADMIXTURES ON THE COMPRESSIVE STRENGTH OF CONCRETE Arif Kesuma Hardi; Sari Utama Dewi
Bulletin of Engineering Science, Technology and Industry Vol. 4 No. 3 (2026): September
Publisher : PT. Radja Intercontinental Publishing

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Abstract

Concrete is among the most often utilized building materials because to its exceptional compressive strength and longevity. Chemical additives are frequently used into concrete formulations to enhance its mechanical characteristics and building efficacy. This research empirically examined the influence of chemical additives on the compressive strength of concrete. Two concrete formulations, specifically standard concrete and concrete with chemical additives, were evaluated at curing durations of 3, 7, and 28 days following SNI 1974:2011 guidelines. The findings indicated that concrete with chemical admixtures consistently attained superior compressive strength compared to standard concrete. The mean compressive strengths of conventional concrete at 3, 7, and 28 days were 18.45 MPa, 22.30 MPa, and 29.80 MPa, respectively, whereas the corresponding values for admixture concrete were 23.90 MPa, 30.60 MPa, and 41.30 MPa. The application of chemical admixtures enhanced the compressive strength by 29.54%, 37.22%, and 38.59% during the corresponding curing durations. These results demonstrate that chemical additives significantly enhance the compressive strength of concrete and can be utilized to create high-performance concrete for structural applications.
ANALYSIS OF TWO-WHEELED ONLINE TRANSPORTATION USAGE IN BANDAR LAMPUNG (Case Study: Maxim, GoJek, and inDrive) Imam Buchori; Fery Hendi Jaya
Bulletin of Engineering Science, Technology and Industry Vol. 4 No. 3 (2026): September
Publisher : PT. Radja Intercontinental Publishing

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Abstract

Advancements in information and communication technology have driven the transformation of transportation systems toward app-based (online) services. The emergence of online two-wheeled transportation has provided urban residents with mobility alternatives that are easier, faster, more economical, and more flexible. In Bandar Lampung City, competition among online transportation providers—such as Gojek , Maxim, and InDrive —has intensified, necessitating an evaluation of user preferences and the quality of services provided. This study aims to analyze the usage of online two-wheeled transportation in Bandar Lampung City and compare user perceptions regarding the service performance of each application based on aspects such as cost-effectiveness, accessibility, comfort, safety, facilities, satisfaction, and supporting infrastructure. The study is grounded in Law Number 22 of 2009 concerning Traffic and Road Transportation and Ministry of Transportation Regulation Number 12 of 2019 concerning Safety Protection for Motorcycle Users in Public Transportation Services. A descriptive research method with a quantitative approach was employed, using questionnaires distributed to users of online two-wheeled transportation in Bandar Lampung City. The data were analyzed using descriptive statistics to outline respondent characteristics and preference levels for each service provider. The results indicate that 62% of respondents use Gojek , 15% use Maxim, 5% use InDrive , and 18% use other online transportation applications. Gojek's high usage rate is attributed to respondents' favorable assessments regarding cost-effectiveness, accessibility, and travel time; riding comfort and safety; facilities and user satisfaction; perceptions of supporting infrastructure; and perceptions regarding the service provider's sustainability. The findings reveal that service quality, ease of access, and user trust are the primary factors influencing public choice regarding online two-wheeled transportation services in Bandar Lampung City. These results are expected to provide valuable insights for local government and service providers to enhance the quality of online transportation services, ensuring they are safe, comfortable, efficient, and sustainable.
TKDN SELF-ASSESSMENT OF REVERSE-ENGINEERED COAL PIPE FABRICATION AT PLN PUSHARLIS: A CASE STUDY Elviena Farizka; Muhamad Habibi; Heryanto
Bulletin of Engineering Science, Technology and Industry Vol. 4 No. 3 (2026): September
Publisher : PT. Radja Intercontinental Publishing

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Abstract

Dependence on imported spare parts in coal-fired power plants increases procurement cost and delivery time, while critical components such as the Coal Pipe are exposed to abrasive wear and elevated operating temperatures. This study evaluates the Domestic Component Level (Tingkat Komponen Dalam Negeri/TKDN) of an SS400 Coal Pipe fabricated by PLN Pusharlis through reverse engineering. A case-study self-assessment was conducted by integrating engineering documents, manufacturing flow, shop drawings, bill of materials, procurement realization, labor, and factory-overhead data with the cost-classification approach required by Indonesian Ministry of Industry Regulation No. 16/M-IND/PER/2/2011. The fabrication approach references ASTM G65 for abrasion-related material considerations and ASME Section IX for welding qualification. The detailed production-cost structure totals IDR 39,571,487.44, consisting of IDR 24,551,412.26 domestic components and IDR 15,020,075.18 foreign components, resulting in a TKDN value of 62.04%. The foreign share is concentrated mainly in primary raw materials, whereas direct labor, indirect labor, and most overhead are domestically sourced. The case demonstrates that reverse engineering can support import substitution while providing an auditable basis for domestic-content accountability
A CASE STUDY ON THE TECHNICAL FEASIBILITY OF FABRICATING A 700-BAR PRESSURE VESSEL USING THE DESIGN-BY-ANALYSIS (DBA) APPROACH AT PT PLN (PERSERO) Yanurarzaqa Ghiffari; Zulfikar Manggau; Muhamad Habibi
Bulletin of Engineering Science, Technology and Industry Vol. 4 No. 3 (2026): September
Publisher : PT. Radja Intercontinental Publishing

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Abstract

Green-hydrogen deployment requires storage vessels capable of sustaining very high pressure while maintaining structural integrity and manufacturability. This study evaluates the technical feasibility of manufacturing a Type II hydrogen pressure vessel at PT PLN (Persero) PUSHARLIS using a Design-by-Analysis approach supported by finite element analysis. The study integrates engineering standards, material screening, workshop observations, design calculations, ANSYS simulation, manufacturing review, and hydrostatic-test planning. The proposed vessel uses an AISI 4130 steel liner with a 49 mm wall and a 14 mm composite hoop-wrapping layer under a 70 MPa (700 bar) internal pressure. Simulation produced a maximum von Mises stress of 381.75 MPa, below the 1,186 MPa yield strength adopted for the liner, with a minimum safety factor of approximately 3.05. The hydrostatic-test scheme uses 910 barg, equivalent to 1.3 times the design pressure. Local ASTM A36 can support prototype manufacturing-process development, but its lower strength makes it unsuitable for long-term high-pressure hydrogen storage. The results indicate a feasible domestic manufacturing pathway provided that high-pressure code qualification, material compatibility, testing capability, and quality assurance are strengthened.
DESIGN AND MODIFICATION OF A MULTI-STATION JIG FOR IMPROVING PRODUCTION CAPACITY IN A PAD PRINTING MACHINE Egy Gunawan Manurung; Prasaja Wikanta
Bulletin of Engineering Science, Technology and Industry Vol. 4 No. 2 (2026): June
Publisher : PT. Radja Intercontinental Publishing

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Abstract

Pad printing is an essential manufacturing process widely deployed across the electronics industry to transfer logos, serial numbers, and identification marks onto product surfaces with high precision. The performance of this process heavily relies on the architectural design of its work-holding jig system, which ensures accurate part alignment and structural stability during high-pressure ink transfer. At PT RPS Precision Engineering, the pad printing machine uses a multi-station jig system. However, the existing jig suffers from constrained dimensions, leading to restricted workpiece placement, slow manual loading/unloading operations, and degraded throughput. This study re-architects and modifies the dimensions of the multi-station jig to maximize production capacity while maintaining total compatibility with the existing printing infrastructure. The applied engineering design framework integrates field observation, CAD-based design optimization, electro-pneumatic integration via Programmable Logic Controller (PLC) synchronization, and a comparative performance evaluation. The re-engineered multi-station jig expands the available workpiece loading area, optimizes operator handling motions, and significantly elevates part positioning accuracy. Empirically, the system achieved a cycle time reduction from 28.45 seconds to 18.00 seconds per unit in initial trials, boosting production output to 1,600 pieces per shift. Machine idle time is minimized, enabling a highly efficient, automated throughput workflow without requiring fundamental modifications to the core pad printing machine. These findings demonstrate that dimensionally optimizing multi-station work-holding systems is an exceptionally practical and cost-effective approach to improving industrial manufacturing productivity.
OPTIMIZING GENERATOR SET MAINTENANCE FOR EMERGENCY BACKUP POWER SUPPLY AT BAROMBONG POLYTECHNIC OF MARITIME STUDIES Ariswanto Sa’pang; Supardi; Paulus Banto; Muhammad. Yusuf
Bulletin of Engineering Science, Technology and Industry Vol. 4 No. 3 (2026): September
Publisher : PT. Radja Intercontinental Publishing

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Electrical power is essential for supporting educational, administrative, and operational activities at Barombong Polytechnic of Maritime Studies. Frequent interruptions in the electricity supply from the national utility company (PLN) may disrupt campus operations, making generator sets (gensets) indispensable as emergency backup power sources. This study aimed to optimize the generator maintenance system to improve its reliability, operational efficiency, and long-term performance. A descriptive qualitative approach was employed using observations, interviews, and documentation involving generator operators and maintenance technicians. The collected data were analyzed using the Failure Mode and Effects Analysis (FMEA) method to identify potential failure modes, evaluate associated risks, and establish maintenance priorities through Risk Priority Number (RPN) analysis. The results revealed that the most critical failures involved the Under Voltage Release (UVR) of the MCCB on the Automatic Transfer Switch (ATS) panel, radiator leakage, and fuel filter leakage. These failures were primarily attributed to inadequate preventive maintenance, limited spare-part availability, and insufficient technical competence among operators. The study concludes that integrating Risk-Based Maintenance (RbM), strengthening preventive maintenance practices, and enhancing technicians’ competencies can significantly improve generator reliability, operational efficiency, and the continuity of emergency power supply in maritime higher education institutions.
Teacher Preparedness For Inclusive Education Of Learners With Visual Impairment Manish Kumar Meena
Bulletin of Engineering Science, Technology and Industry Vol. 4 No. 3 (2026): September
Publisher : PT. Radja Intercontinental Publishing

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Inclusive education has become a central policy commitment in national and international education frameworks, yet its realization for learners with visual impairment depends heavily on the readiness of classroom teachers to meet their instructional, sensory, and social needs. This paper examines teacher preparedness for the inclusive education of learners with visual impairment, focusing on the knowledge, skills, attitudes, and institutional supports that shape effective practice. Drawing on a review of empirical and theoretical literature, the paper analyzes five interrelated dimensions of preparedness: pre-service teacher education, in-service professional development, availability of specialized resources and assistive technology, teacher attitudes and self-efficacy, and the quality of collaborative and institutional support structures. The review indicates that general education teachers frequently report inadequate training in disability-specific pedagogy, particularly in Braille literacy, orientation and mobility awareness, and the use of assistive technology, and that this gap is compounded by limited access to specialist personnel and instructional materials. At the same time, evidence suggests that structured training, sustained mentorship, and positive exposure to learners with visual impairment significantly improve teacher confidence and instructional adaptation. The paper argues that teacher preparedness should be understood not as a fixed trait but as a developmental continuum that is shaped jointly by initial training, ongoing professional learning, and the broader policy and resource environment of the school. Recommendations are offered for teacher education institutions, school administrators, and policymakers, including the integration of disability-specific content into pre-service curricula, expansion of practicum experiences with learners with visual impairment, provision of assistive technology and specialist support at the school level, and the establishment of continuous professional development pathways. The paper concludes that meaningful inclusion for learners with visual impairment requires coordinated investment across these dimensions rather than isolated interventions.

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