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Journal of Engineering and Technological Sciences
Published by Institut Teknologi Bandung
ISSN : 23385502     EISSN : 23375779     DOI : 10.5614/j.eng.technol.sci
Core Subject : Engineering,
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering
ournal of Engineering and Technological Sciences welcomes full research articles in: General Engineering Earth-Surface Processes Materials Science Environmental Science Mechanical Engineering Chemical Engineering Civil and Structural Engineering Authors are invited to submit articles that have not been published previously and are not under consideration elsewhere.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 132 Documents
 10   11   12   13   14 
Strategic Location of Fluid Viscous Dampers in High-rise Reinforced Concrete Buildings for Seismic Resilience: A Comparative Analysis Tallapragada, Sai Datta Phanindranath; Kokkirala, Venkata Gopala Dhana Rao Balaji; Bantupalli, Ramesh; Ponnada, Markandeya Raju; Kapuganti, Chitti Babu
Journal of Engineering and Technological Sciences Vol. 57 No. 5 (2025): Vol. 57 No. 5 (2025): October
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.5.5

Abstract

High-rise reinforced concrete (RC) buildings are highly vulnerable to seismic forces due to their ‎inherent structural limitations, necessitating effective energy dissipation mechanisms. Conventional ‎damping strategies often fail to adequately control excessive vibrations, leading to potential ‎structural damage. Fluid Viscous Dampers (FVDs) offer a novel approach by significantly ‎improving energy dissipation and reducing seismic responses. However, the optimal configuration, ‎placement, and quantity of FVDs in high-rise buildings remain insufficiently explored, ‎necessitating this study. This research introduces a novel damper placement framework by ‎investigating the strategic positioning of FVDs in a 25-storey RC benchmark building, evaluating ‎‎80 damper configurations using non-linear time history analysis in ETABS. The study compares ‎Strategic Location Formats (SLFs) against Arbitrary Location Formats (ALFs) and Uniformly ‎Distributed Frames (UDFs) to determine the most effective and economical damper placement ‎strategy. Findings reveal that SLFs achieve superior seismic performance while using significantly ‎fewer dampers, demonstrating an innovative and cost-effective approach to structural damping. ‎SLFs achieve up to 45% reduction in displacement, 56% reduction in inter-storey drift, and 54% ‎reduction in base shear, using only 36 dampers, compared to 96 in ALFs and 192 in UDFs. ‎Additionally, SLFs are highly cost-efficient, requiring only 9% of total construction costs, ‎compared to 24% for ALFs and 49% for UDFs. This study establishes a novel, performance-based ‎damper placement framework, offering a scientifically validated methodology for optimizing ‎seismic resilience while maintaining economic feasibility. These findings make SLFs a ‎transformative solution for high-rise RC buildings in earthquake-prone regions.
Optimation PAN/TiO2 Nanofiber Membrane as Separator for Symmetric Supercapacitor Nasikhudin, Nasikhudin; Agustina, Silvia Nurlaili; Diantoro, Markus; Yogihati, Chusnana Insjaf; Suryana, Risa; Alias, Yatimah Binti
Journal of Engineering and Technological Sciences Vol. 57 No. 5 (2025): Vol. 57 No. 5 (2025): October
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.5.6

Abstract

Supercapacitor is one of the energy storage systems known for their high-power density, long cycle life, and good cycling stability. To improve supercapacitor performance, we used a polymer PAN composite titanium dioxide (TiO2) as the separator material. Nanofiber separator membranes of PAN/TiO₂ with various masses (0, 5, 10, 15, and 20 wt%) were successfully synthesized using the electrospinning technique. The addition of TiO2 for modified fiber, due to its high absorption rate for energy storage, increased electrolyte uptake and optimized supercapacitor performance. The morphology, functional groups, crystallinity, and thermal stability of the membranes were identified using scanning electron microscope (SEM), Fourier transform infra-red (FTIR), x-ray diffraction (XRD), and thermogravimetric analysis (TGA), respectively. It was found that the membrane with 15 wt% TiO2 exhibited a fiber diameter of 224.73 nm, pore size of 138.98 nm, the highest porosity of 66.50%, electrolyte uptake of 240%, and thermal stability up to 282°C, with a remaining mass of 3.94% after being tested at 1000°C. The electrochemical performance of the supercapacitors was measured using galvanostatic charge-discharge (GCD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The membrane containing 15 wt% TiO2 demonstrated optimum ionic conductivity of 4.4 x 10-4 S/cm, gravimetric capacitance of 57.770 F. g-1, and capacitance retention of 94.22% after 1000 test cycles.
Advanced Geotechnical Solutions for Soft Soils: FEM Analysis and Hybrid Reinforcement in the Semarang-Demak Toll Road Project Kartawiria, Andi Kurnia Setiadi; Kamaruddin, Samira Albati Binti; Nazir, Ramli Bin; Alatas, Idrus Muhamad; Himawan, Agus; Hartasurya, Pasca; Imran, Iswandi; Mikhail, Reguel; Kurniawan, Yusrizal; Wibowo, Prasetyo Arief; Manurung, Ardita Elias; Maharani, Yusuf; Anggadinata, Yusmar; Setiawan, Muhammad Hariyadi; Siswantono, Siswantono; Wibawa, Sholeh Hendra; Editia, Rakhma Nur
Journal of Engineering and Technological Sciences Vol. 57 No. 5 (2025): Vol. 57 No. 5 (2025): October
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.5.7

Abstract

This paper presents an analysis of the data collected from the full-scale trial embankment implemented in the Semarang-Demak Toll Road project, part of a national strategic project in Central Java, Indonesia. The project integrates a sea dike with a road embankment. The main challenge of the project lies in constructing the embankment on soft soil layers up to 40 meters thick. The road embankment is designed to reach a height of 6 meters above Mean Sea Level (MSL) or 8 meters above the average seabed level. In the absence of ground improvement techniques—such as bamboo mattress, prefabricated vertical drains (PVD), or high-strength geotextiles—very soft soil with an undrained shear strength of approximately 6.5 kPa can support only a critical embankment height of about 3 meters. A hybrid reinforcement that combines bamboo mattresses, high-strength woven geotextile, PVD and staged embankment construction is selected to solve the shear strength and settlement problem. Mattress acts as platform and designed to deform as much as the soft-soil to spread initial embankment load uniformly and increase bearing capacity, PVD accelerates consolidation, and high-strength woven geotextile provides tension capacity. To achieve a load ratio of 1.3 in accordance with SNI 8460-2017, a 13.5-meter soil preloading needs to be constructed. Several monitoring systems were installed to monitor the behavior of the entire embankment system. Complementary investigations, including CPT, CPTu, and Deep Boring, were conducted. Finite element analysis (FEA) was then performed, revealing improved performance, achieving safety factors of 1.25 during construction and 1.55 long-term.
Integrated CFD and Aspen Plus Simulation for Optimizing Biomass Combustion: A Study on Sugarcane Bagasse Nugraha, Maulana Gilar; Azarya, Eblin Alle; Hidayat, Muslikhin; Saptoadi, Harwin
Journal of Engineering and Technological Sciences Vol. 57 No. 5 (2025): Vol. 57 No. 5 (2025): October
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.5.8

Abstract

This study presents an integrated simulation approach to optimize biomass combustion using sugarcane bagasse as a renewable feedstock. Computational fluid dynamics (CFD) was employed to model combustion hydrodynamics, while Aspen Plus was used to simulate pyrolysis product distribution based on Gibbs free energy minimization. The simulation involved key parameters such as air-fuel ratio, excess air level (100% and 200%), and combustion temperature profiles, which were validated against experimental data from a lab-scale grate-fired furnace. The pyrolysis results revealed that increasing the temperature from 400°C to 600°C significantly enhanced CO and H₂ concentrations, thereby improving syngas reactivity. CFD analysis showed that, at 100% excess air, CO₂ concentration reached 9.15% with an average freeboard temperature of 405.2°C, while at 200% excess air, the CO₂ dropped to 6.46% and the temperature decreased to 397.9°C, indicating reduced combustion efficiency. These results underscore the importance of optimizing air supply to enhance combustion performance and minimize unburnt volatiles. The findings confirm that integrating CFD and Aspen Plus simulations provides a reliable framework for improving the efficiency and environmental performance of biomass combustion systems.
Enhancing Random Forest Model Accuracy using GridSearchCV Optimization for Predicting Multi-Cylinder Engine Performance with Hydrogen-Enriched Natural Gas Blends Sutar, Prasanna S; Sekhar, Ravi; Sonawane, Shailesh B; Bandyopadhyay, Debjyoti; Rairikar, Sandeep D; Thipse, Sukrut S; Ganorkar, Hiranmayee
Journal of Engineering and Technological Sciences Vol. 57 No. 5 (2025): Vol. 57 No. 5 (2025): October
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.5.9

Abstract

Diesel generators (gensets) are essential in India for industries, construction, agriculture, and as backup power for hospitals and data centres. Common fuels include diesel, petrol, natural gas, and, increasingly, solar energy, with hybrid systems gaining popularity for improved efficiency and reduced emissions. Diesel gensets remain reliable and cost-effective, especially in remote areas, but growing environmental concerns are driving adoption of cleaner alternatives like compressed natural gas (CNG), bio-CNG, and dual-fuel systems. HCNG (hydrogen-enriched compressed natural gas) gensets are more efficient and environmentally friendly, though they require greater initial investment. Adding hydrogen enhances combustion and reduces emissions. In this study, various HCNG blends were tested on a multi-cylinder, single-speed gas engine. Experimental evaluation of combustion and performance characteristics is typically time and resource-intensive, so Machine Learning (ML) was applied to streamline the process, thereby minimizing the number of required experiments. The engine performance is assessed using the engine dynamometer, whereas the combustion characteristics are obtained from the High-Speed Data Acquisition (HSDA) system. A Random Forest (RF) regression model was developed to predict performance and combustion characteristics for higher HCNG blends from lower-blend data, with hyperparameter optimization used to improve accuracy and minimize overfitting. Predicted values were validated against experimental results, showing strong correlations. Key parameters like Brake-Specific Fuel Consumption (BSFC), Brake Mean Effective Pressure (BMEP), Exhaust Temperature, Maximum In-Cylinder Combustion Pressure (Pmax), Indicated Mean Effective Pressure (IMEP) and Combustion Duration were predicted, with evaluations showing strong correlations between predicted values and actual results.
Experimental Research on Sustained Concrete with the Partially Substitutions of GGBS, Fly ash and Silica Fume as a Cementitious Material Cheruvu, Rajasekhar; Rao, B Kameswara; Reddy, M Achyutha Kumar
Journal of Engineering and Technological Sciences Vol. 57 No. 5 (2025): Vol. 57 No. 5 (2025): October
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.5.10

Abstract

The aim of this study is to figure whether adding more cementitious elements like fly ash, ground granulated blast furnace slag (GGBS), and silica fume impacts the strength and durability of concrete. Concrete samples were put together with water-to-binder (w/b) ratios of 0.3, 0.4, and 0.5 after 28, 56, and 90 days of curing. After that, these ratios were tested before being employed. After 90 days, when 60% of the cement was replaced with fly ash at a water-to-binder (w/b) ratio of 0.3, the compressive strength reached 55.56 MPa. This is in contrast to the compressive strength of 32.89 MPa at 28 days. A 20% GGBS replacement also made the strength go up from 47.11 MPa after 28 days to 60.44 MPa after 90 days at the end of the trial. Adding 4% silica fume to each batch always made the strength grow stronger. The water sorptivity tests that were conducted to determine the durability performance showed that there was a substantial increase. The mixture with 20% GGBS and 4% silica fume, which had a water-to-binder (w/b) ratio of 0.4, had the lowest sorptivity value, which was 0.015 mm/min⁰·⁵.  The study shows that alternative materials lower water permeability, structural integrity, and carbon emissions, promoting sustainable development.    However, it knows that the building industry must source carefully and organize logistically to protect the environment.
Developing Carbon Nanofibers from Gnetum Gnemon Linn Pericarp Using Dual Activators KOH And Melamine as Innovative Electrode Materials for Supercapacitors Farma, Rakhmawati; Putri, Hardini Chania; Apriyani, Irma; Azwat, Luqyana Adha; Awitdrus, Awitdrus; Deraman, Mohamad; Rini, Ari Sulistyo; Setiadi, Rahmondia Nanda; Taer, Erman
Journal of Engineering and Technological Sciences Vol. 57 No. 6 (2025): Vol. 57 No. 6 (2025): December
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.6.2

Abstract

Synthesis of carbon nanofibers from Gnetum gnemon Linn (GP) biomass with dual activators, KOH and melamine, offers a potential approach for high-performance supercapacitor electrodes. This study evaluated the preparation of GP-based carbon nanofibers through single and double activation, with varying melamine masses of 0.1, 0.3, and 0.5 g at 0.3 M KOH. The pyrolysis (integrated carbonization and physical activation) occurred at 600°C in N₂ and 800°C in CO₂ atmospheres. The material was activated using 0.3 g of melamine in 0.3 M KOH to produce abundant and highly amorphous nanofiber structures. These characteristics contributed to the high specific capacitance of 400 F/g at a scan rate of 1 mV/s and an energy density of 17 Wh/kg at a power of 465 W/kg. These results demonstrated the synergistic effect of melamine and KOH in increasing the active surface area and structural conductivity. This finding confirms the potential of GP biomass that has not been optimally utilized as a sustainable precursor for energy storage applications, especially supercapacitors.
Crashworthy Structure Analysis of Indonesia's First High-speed Train Trailer Made from Aluminum Extrusion Syaifudin, Achmad; Muh Luqman, Khakim
Journal of Engineering and Technological Sciences Vol. 57 No. 6 (2025): Vol. 57 No. 6 (2025): December
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.6.3

Abstract

In the development of high-speed trains, evaluating the crashworthiness of passenger car structures is essential, particularly in the vestibule area which designed to absorb impact energy. When constructed entirely from aluminum extrusion, the vestibule exhibits high stiffness and uncontrolled energy absorption, resulting in excessive deceleration during collisions. This study investigates the crashworthiness of the vestibule structure in Indonesian high-speed train trailers, referencing EN 15227/SNI 8826 and 49 CFR 238 standards. A numerical analysis was conducted using ANSYS LS-DYNA, examining four structural configurations: a full aluminum extrusion model referred to the rear end structure of the HST locomotive, and three alternatives incorporating structural beams in the roof, floor, and modified floor areas. Simulations involved train collisions with a rigid wall at regulated speeds, using aluminum 6005A-T6 modeled with the Johnson-Cook material model to account for high strain rates. Results showed that the full aluminum design produced excessive deceleration and failed to meet EN 15227/SNI 8826 criteria. In contrast, the modified floor frame design achieved the lowest crash force and deceleration, controlled energy absorption, no survival space reduction, and compliance with EN 15227/SNI 8826, though it did not meet 49 CFR 238 deceleration limits due to full vestibule deformation. These findings offer valuable insights for manufacturers seeking to enhance the crashworthiness of high-speed train passenger cars.
The Effect of Ignition Timing on Combustion of Ammonia/Ethanol Mixtures in Spark-Assisted Compression Ignition Engine with a Sub-chamber Okada, Takanobu; Ichiyanagi, Mitsuhisa; Yilmaz, Emir; Suzuki, Takashi; Shiraishi, Hikaru; Ngwompe Souop, Eric Le Roy; Widjaja, Evan; Sutedjo, Jason; Marcelo, Christian Dennis; Tjiotijono, Ferdinand Ronaldo; Gotama, Gabriel Jeremy; Anggono, Willyanto
Journal of Engineering and Technological Sciences Vol. 57 No. 6 (2025): Vol. 57 No. 6 (2025): December
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.6.1

Abstract

Carbon dioxide (CO2) is the primary contributor to greenhouse gas emissions. Ammonia (NH3) has emerged as a promising alternative fuel due to its high energy density, ease of transportation, and carbon-free molecular structure. However, its practical application is challenged by slow combustion characteristics and high ignition temperatures. This study investigates the combustion behaviour of ethanol-ammonia mixtures using a high-compression-ratio engine (17.7:1) equipped with a sub-chamber. The engine operated at a constant speed of 1000 rpm. Ammonia energy ratios of 40%, 50%, and 60% were tested across ignition timings of 0°, 2°, 4°, 6°, and 8° crank angle (CA) before top dead center (BTDC). Results indicate that advancing the ignition timing increases in-cylinder pressure and heat release rate while reducing combustion duration. Lower ammonia energy ratios yielded higher thermal efficiency. Conversely, higher ammonia content and advanced ignition timings led to increased NOx emissions.
Influences of Groove Geometries on Bend Radius and Springback in V-Bending Banh, Quoc-Nguyen; Le, Viet-Khai; Le, Anh-Chuong; Tran, Anh-Son; Ho, Minh-Tuan
Journal of Engineering and Technological Sciences Vol. 57 No. 6 (2025): Vol. 57 No. 6 (2025): December
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.6.4

Abstract

Investigation of the V-bending process with the effect of V-grooving insert geometries is performed through finite element analysis within ANSYS LS-DYNA. Different V-groover geometries are tested to evaluate the effect on the final bent angle and bent radius of the sheet metal part, with the objective of obtaining the minimized bent angle and bent radius results. It is also observed that the corner radius of the V-groover has a major influence on the bent angle and bent radius. Due to the removal of material in the bending region, which reduced the bending resistance, an increase in the corner radius results in a decrease in both the bent angle and radius. The shape of V-groover also affects the bending results, with variations in geometries leading to variations in both bent angle and radius. When the cutting cross-sectional area is kept constant, the bent angle shows minimal variation, while the bent radius steadily increases with the V-groover angle, reaching its maximum at 90 degrees.

Page 12 of 14 | Total Record : 132

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