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Yuliah Qotimah
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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 158 Documents
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Enhanced Finite Element Numerical Analysis of Rigid Inclusion Lateral Resistance for Embankment on Slightly Overconsolidated Soft Clay Kanti Haskarini; Agus Himawan; Masyhur Irsyam; Sugeng Krisnanto; Darmawan Adi Susanto; Bintang Putra Nusantara
Journal of Engineering and Technological Sciences Vol. 58 No. 3 (2026): Vol. 58 No. 3(2026): June
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.2026.58.3.5

Abstract

Soft clay soils represent a significant challenge for embankment construction due to high compressibility, low shear strength, low bearing capacity, and excessive settlement potential. This study presents an enhanced finite-element model to evaluate the performance of Mortar Column Inclusion (Inklusi Kolom Mortar, or IKM) as a rigid inclusion supporting embankments over slightly overconsolidated soft clays, as implemented in the Serang-Panimbang Toll Road Project (STA 75+600 to STA 75+800). The propose approach integrates depth-dependent multilinear lateral resistance with structural “dummy” plate elements to capture soil arching within the Load Transfer Platform (LTP) and lateral column-soil interaction—an approach not previously applied in rigid inclusions modeling for soft clays. Studies on numerical modeling of IKM systems in slightly overconsolidated soft clays remain limited. Finite element analyses are conducted using PLAXIS 2D and 3D with axisymmetric, unit-cell, and plane strain approaches. The results show that the "dummy" plate simulates soil arching in the LTP and improves the representation of negative skin friction, neutral-plane transition, and axial load distribution. Depth-dependent lateral resistance enhances predictions of column bending moments and horizontal deformation within varying soil layers. Field validation indicates good agreement, with inclinometer displacement predicted at 40.79 mm (difference < 10%). Predicted vertical settlements of 20.71 cm (centerline) and 19.38 (edge) are also consistent with settlement plate readings of 15.80 and 11.00 cm, respectively. These findings confirm that the enhanced model provides a comprehensive evaluation of stress distribution, pile deformation, and global stability for ground improvement design in soft clays
An Experimental Study on the Structural Behavior of RC Columns when Using Crumb Rubber Concrete Combined with Recycled Steel Fibers Hasan A. Alasmari
Journal of Engineering and Technological Sciences Vol. 58 No. 3 (2026): Vol. 58 No. 3(2026): June
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.2026.58.3.10

Abstract

The growing demand for vehicles has spurred an increase in tire production. However, the improper disposal of these waste tires poses a significant environmental and health hazard. To address this, recent research has explored the integration of recycled steel fibers (RSF) and crumb rubber (Cr) from used tires into concrete formulations to create innovative rubberized and fibrous concrete. A notable study specifically examined the impact of adding RSF of varying lengths and a fixed volume fraction into rubberized concrete containing different proportions of Cr, where Cr partially replaced natural sand. Through the fabrication and testing of 18 reinforced concrete columns under axial compression, the findings demonstrated that RSF alone significantly enhanced the concrete’s properties, including density, compressive strength, and tensile strength, by remarkable percentages of 100.27%, 116.84%, and 107.25%, respectively. Conversely, the exclusive use of Cr resulted in a decline in these properties as its content increased. Notably, the "Co5" columns, which incorporated RSF into a concrete mix containing Cr, exhibited superior performance, showing improved displacement and ductility by a degree of approximately 44.67% and 15.65%, respectively, alongside a significant reduction in crack widths by about 29.45% compared to standard rubberized concrete (Co1&Co2). The properties and attributes of columns display promising performance as well as displacement and ductility when RSF is incorporated into concrete mix that includes Cr compared to rubberized concrete.
Chloride Salt-Intercalated Ti2C Membranes for Ultraquick Cationic Dye Removal Fuja Sagita; Kholifatul Mukhoibibah; Grandprix T. M. Kadja
Journal of Engineering and Technological Sciences Vol. 58 No. 4 (2026): : August (In Progress)
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.2026.58.4.1

Abstract

Ti2C is a 2D nanomaterial with an ultrathin layered structure. This material has remarkable properties due to the -O, -F, and -OH functional groups in surface termination, which makes it hydrophilic and suitable for membrane applications. Herein, we reported the chloride salt-intercalated Ti2C membrane for methylene blue (MB) removal. The modification was done by a simple mixing method between chloride salt and Ti2C. First, Ti2C was synthesized from its parent phase of Ti2AlC using in-situ HF etchant. Then, Ti2C was modified using chloride salt (NaCl, KCl, MgCl2, and CaCl2), and mixed cellulose ester (MCE) was used as a membrane support to produce a MXene-based membrane (MXM). The results show that chloride salt ions enhance the interlayer spacing of Ti2C due to the ability of salt cation to be inserted and replace the Li+ as intercalant. This result is also evidenced by the difference in d-spacing in XRD analysis. In methylene blue removal, the flux of the membrane was excellent, around 2000-3000 L m-2 h-1, with a dye removal value above 97%. The high dye removal is correlated with the electrostatic interaction between the negative surface of Ti2C and the positive charge of MB. Then, the remarkable performance was reached by MXM-KCl with flux and rejection of 3303.31 L m-2 h-1 and 99.01%, respectively. The excellent flux of MXM-KCl correlated with the Gibbs free energy hydration of K+ is lower than the other salt cations (Na+, Mg2+, and Ca2+). In addition, all membranes exhibit great fouling resistance, with an FRR value of about 90%.
Analysis of Mechanical Properties and Acoustic-Thermal Response Characteristics of Water-Soaked Gabbro Zhi Bin; Xu Xiaojing; Wang Qijie; Li Changwei; Zhang Yutao; Song Zhanping; Kang Baoxiang
Journal of Engineering and Technological Sciences Vol. 58 No. 4 (2026): : August (In Progress)
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.2026.58.4.2

Abstract

With the national strategy being implemented and taking root in the infrastructure sector, the increased of water erosion in rock formations during railway construction has risen significantly, posing a considerable risk to the stability and structural integrity of engineering rock formations. Consequently, there is a critical need to investigate how water influences the mechanical properties of gabbro. Uniaxial compression experiments were performed on both arid and water-soaked gabbro pieces, simultaneously monitoring the characteristics of acoustic emission (AE) and infrared radiation (IR) response. The Particle Flow Code (PFC) was utilized to examine the microscopic processes of crack propagation, coalescence, and damage progression in the rock pieces. Observations show that water considerably impacts the mechanical characteristics of gabbro. In comparison to arid pieces, the peak strength of water-soaked pieces showed a reduction of 4.98%, while the elastic modulus was diminished by 16.5%. The failure behavior of the pieces shifted progressively from tensile splitting in the arid condition to tensile-shear failure. Both arid and water-soaked pieces displayed pre-shock-main shock patterns in their AE parameters. By creating a damage variable based on cumulative AE ring counts, the damage evolution of the pieces was categorized into three phases: incipient damage, steady damage, and expedited damage phases. Throughout loading and fracturing, the AIRT (average infrared radiation temperature) curve exhibited a downward trend, followed by a sharp rise, featuring a "V"-shaped turn prior to piece failure. The evolution of AIRT in water-soaked pieces showed strong alignment with stress variations. Numerical simulations using PFC revealed that the quantity of shear cracks in water-soaked pieces increased, constituting a larger share of the total cracks in contrast to arid pieces. After loading, water-soaked pieces generated more strong force chains, with the load borne by bonds gradually increasing, making them more susceptible to failure.
Comparative Analysis of Photogrammetry Tools for Monitoring Trench and Pipeline Progress Towards Sustainable Construction Muhammad Hassaan Farooq Khan; Wesam Salah Alaloul; Muhammad Ali Musarat; Abdul Mateen Khan; Socheatra Soeung
Journal of Engineering and Technological Sciences Vol. 58 No. 3 (2026): Vol. 58 No. 3(2026): June
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.2026.58.3.9

Abstract

The construction of trenches and pipelines is essential to the infrastructure sector, but because of safety and technical concerns, progress monitoring is difficult. This study assesses how well photogrammetry, a cost-effective and adaptable Industry 4.0 technology, can improve safety and sustainability in construction monitoring. The graphical user interface, computational efficiency, point cloud density, model quality, percent completion, and noise in the produced 3D models were the criteria used to evaluate the six photogrammetry tools: Autodesk Recap Pro, Agisoft Metashape Pro, COLMAP, VisualSFM, Meshroom, and Regard 3D. Performance under specified conditions was examined using a trench and pipeline dataset. The results show that Agisoft Metashape Pro and Autodesk Recap Pro performed exceptionally well, offering thorough and precise 3D reconstructions with excellent models and low noise. This research promotes the use of photogrammetry by emphasizing its advantages over conventional methods in terms of affordability and sustainability. It highlights photogrammetry's contribution to resilient and sustainable practices and provides industry experts with advice on how to choose appropriate methods for tracking building progress. The results help stakeholders feel more confident about implementing photogrammetric technologies that are suited to various building settings.
Digital Value Engineering for Sustainable Commercial Buildings: A BIM and Life Cycle Cost-Based Decision-Making Framework Abdul Mateen Khan; Wesam Salah Alaloul; Muhammad Ali Musarat; Socheatra Soeung
Journal of Engineering and Technological Sciences Vol. 58 No. 3 (2026): Vol. 58 No. 3(2026): June
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.2026.58.3.8

Abstract

Sustainable commercial buildings require cost-effective and environmentally responsible design solutions. Traditional Value Engineering (VE) methods, while effective in cost reduction, often lack integration with digital tools, limiting their ability to optimize sustainability and performance. This study develops a Digital Value Engineering Model (DVEM) that aligns with Industry 4.0 principles, incorporating Building Information Modeling (BIM), Life Cycle Cost (LCC) analysis, and a weighted evaluation matrix to enhance decision-making transparency, cost efficiency, and environmental impact assessment. The model was implemented in Autodesk Revit and applied to a real-life commercial building project in Malaysia, systematically following six VE phases. The results demonstrate a 28% cost reduction while optimizing material selection, energy efficiency, and lifecycle performance. Unlike conventional VE, DVEM enables automated cost analysis, real-time sustainability assessment, and function-based decision modeling. By bridging traditional VE with modern digital workflows, this study provides a replicable, data-driven approach to optimizing commercial building design. The findings contribute to the construction industry by introducing a structured, scalable framework that enhances decision-making efficiency, resource utilization, and sustainability compliance in commercial building projects.
Improving Single-Phase Induction Motor Speed Control Using Model Reference Adaptive System and Fuzzy-Pid Regulator Kurui Faith Jepchirchir; Muriithi Christopher Maina; Oyie Nicholas
Journal of Engineering and Technological Sciences Vol. 58 No. 3 (2026): Vol. 58 No. 3(2026): June
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.2026.58.3.6

Abstract

As industries strive to enhance their applications to meet growing market demand, accurate speed control of single-phase induction motors (SPIMs) remains a crucial concern. This paper presents the modelling and simulation of SPIM speed control based on a hybrid Model Reference Adaptive System (MRAS) integrated with a Fuzzy–PID regulator. Superior performance was achieved by integrating MRAS with a fuzzy-PID regulator using an adaptive self-tuning mechanism. The purpose of this integration was to leverage the adaptive nature of MRAS and the robustness of the Fuzzy-PID regulator to enhance performance and reliability in SPIM drives without the need for physical sensors. The SPIM speed was modelled using differential equations representing both electrical and mechanical dynamics. MRAS was implemented using motor voltage equations, with an adaptive model estimating the rotor speed. The Fuzzy-PID regulator optimized control performance by processing the error and its rate of change through a fuzzy controller, with the output fed into a PID controller to ensure error stabilization. A review of relevant literature on SPIM and associated control theories was conducted, and several journal papers were analyzed. Simulation of the proposed MRAS–Fuzzy-PID approach in MATLAB demonstrated that sensorless speed regulation considerably reduced rise time, enabling the motor to reach the desired speed quickly while eliminating steady-state error compared to systems without controllers. The results indicate that the rise time was reduced by 65.5%, the overshoot decreased by 58.9%, the steady-state error decreased by 71.8%, and the Integral of Absolute Error (IAE) was minimized. These improvements ensured stable operation under varying load conditions, with minimal fluctuations in speed. Integrating MRAS with a Fuzzy-PID controller further enhances the speed stability, robustness, and adaptability of SPIM drives.
An Enhanced Fuzzy Logic-Particle Swarm Optimization Algorithm for the Strategy Control of Self-driving Electric Vehicles Le Dinh Hieu; Ngo Xuan Cuong; Do Nhu Y
Journal of Engineering and Technological Sciences Vol. 58 No. 3 (2026): Vol. 58 No. 3(2026): June
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.2026.58.3.7

Abstract

With the current rapid advancement of science and technology, there is an increasing focus on comprehensive research and the development of practical solutions for self-driving electric cars to address challenges, including environmental pollution, renewable energy utilization, emission control, and battery recycling. In this study, automatic direction control is achieved for electric vehicles by implementing line-tracing autonomous vehicles equipped with computer vision-based cameras, utilizing Particle Swarm Optimization (PSO), the Takagi–Sugeno Fuzzy model, and the PID control system. Line-tracing autonomous vehicles are devices capable of recognizing and tracking black or painted lines on the road. The lines are designed to be easily recognizable with a clear contrast, such as a white line on a black background. The autonomous vehicle follows a distinct, marked line to guide its journey. In this study, we integrate computer vision techniques with Particle Swarm Optimization (PSO) and a Takagi–Sugeno fuzzy control system for automatic direction control. Additionally, the speed and turning direction of the electric vehicle are regulated by a controller that combines proportional, integral, and derivative (PID) stages. According to real-world experiments with road-following autonomous vehicles using camera image processing, the highest success rate of 99.8% is achieved when the car employs intelligent algorithms to navigate turns of 10, 20, 30, and 40 degrees. Likewise, tests have demonstrated that the electric vehicle can achieve a perfect success rate of 100% when driving on a straight road.

Page 16 of 16 | Total Record : 158

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