International Journal of Integrated Engineering
Not a member yet
2309 research outputs found
Sort by
Flight Performance of a VTOL Version of a Transport Blended Wing-Body UAV
Full text linkThe blended wing-body (BWB) UAV with vertical take-off and landing (VTOL) capabilities has garnered attention in aviation due to its advancements and advantages, such as noise reduction and safety features. This study analyses BWB UAV VTOL flight performance and mission capabilities. The evaluation involves conceptual design, theoretical calculations, and data analysis to assess parameters such as range, endurance, weight, manoeuvrability, and more. Furthermore, mission profile analysis is used for surveillance scenarios and offers insights into the UAV\u27s performance in these operational environments. Microsoft Excel is the main tool used in this research for calculations, simulations, and data analysis. Using a spreadsheet, this method computes critical performance metrics according to the mission requirements, operational parameters, and design specifications of the UAV. The study\u27s findings provide important insight into the BWB UAV VTOL prototype\u27s flight characteristics and mission capabilities. These results point to the aircraft’s ideal operating conditions and assist in identifying any potential drawbacks or performance limitations that may vary as further study proceeds. Microsoft Excel provides a useful and approachable way to evaluate UAV VTOL performance. It enables fast updates and modifications to meet changing mission requirements and design iterations. Other than that, a thorough examination of the flight characteristics and mission profile of the BWB UAV VTOL prototype brings this study to a close. It offers insightful information that can be used to improve design, schedule operations, and predict performance in the field of aerial transportation and other pertinent applications
Implementation of Digital Twin for Investigation of Delayed Building Construction
Full text linkDuring 2020-2022, a significant portion of the national budget was redirected to the healthcare sector for the handling of COVID-19 and economic recovery in Indonesia. This policy has resulted in delays in infrastructure development both nationally and locally. One example is the construction of a government office in Bandung. If construction resumes, investigating the level of damage to structural elements becomes crucial. In this research, the investigation of the level of damage was conducted by constructing a Digital Twin in the form of a 3D building model using the Terrestrial Lasser Scanner (TLS) BLK360, Cyclone Register 360 software, and Autodesk Recap Pro. The visual investigation results on the 3D model show the presence of 31 elements, with 39% mild damage and 61% moderate damage out of the total detected damage on columns, beams, and slabs. On the structural element, tests were conducted, with the assistance of the Non-Destructive Test (NDT) equipment, and the examination of the nominal moment capacity strength of the structural elements showed that several elements have experienced damage and a reduction in nominal moment capacity after 3 years construction delayed. On the column there was an increase in nominal moment capacity by 47 kNm and shear strength difference of 5.394 kN. On the Beam, there was a decrease in negative nominal moment capacity, where the value of M_(n^- ) actual = 187,067 kNm while the M_(n^- ) planned = 241,389 kNm. On floor slab there was a decrease in the nominal moment capacity in the x-direction M_n actual = 22,984 kNm while the M_n planned = 28,932 kNm. In the y-direction M_n actual = 24,167 kNm while the M_n planned = 22,594 kNm. Based on the investigation results, the delayed building construction can be resumed by repairing and strengthening the damaged structural elements using grouting, epoxy injection, and Fiber-Reinforced Plastic (FRP) methods
Defining Action Plans to Reduce Defects in a Paper Production Line Using Statistical Process Control and Fuzzy Analytical Hierarchy Procedure
Full text linkDefect prevention in products is essential to improve production efficiency and improve product quality in accordance with consumer expectations. Action plants to prevent defects in a paper factory were tried to be found in this research. The action plan was obtained using Statistical Process Control to control production to comply with specific limits, and Fuzzy Analytical Hierarchy Procedure used to find the priority of the problem. The data collected showed that the primary defects were in the form of wrapping alignment and folding sheets. Analysis showed that wrapper properties and the length of time the wrapper roll on the floor caused the problems. To overcome the causes of the problems, three action plans need to be taken: training, creating SOPs, and creating maintenance checklists
Solid Wastes Management of Monastery by Circular Economy: Case Studies of Chakdang and Suankeaw Temples in Thailand
Full text linkAlong with the natural uses for production and consumption; various waste types, particularly solid wastes have been massively increased. Municipal solid waste is one of the critical generating solid wastes. Monastery, as one type of municipal solid wastes generating sources, has been rarely justified for solid waste management. This paper is to present solid wastes management of the Monastery using circular economy (CE) concept. The study monasteries included Chakdang and Suankeaw Temples in Thailand. Both temples have carried out solid wastes management on CE approach, 5 Rs (Reduction, Repair, Recycle, Reuse, Refurbish), but different in some Rs implementation. Chakdang Temple has emphasized recycle processing particularly plastic bottles recycled to fibres to proceed for yellow robe for monk, blanket, T-shirt, etc; biodegradation of food wastes to fertilizer by digestion tank, composting of plant residue to fertilizer, conversion of plastic bags and plastic straws to gasoline by pyrolysis. The CE approaches were mainly reduction through separation together with recycle, and some repair and refurbish. While Suankeaw Temple has used the donated items (mostly electric items and furniture including televisions, refrigerators, fans, computers, beds, wardrobes, chairs, tables, etc) for solid wastes processing through separation and selling to the old goods retailing shops by auction; bio-degradation of animal excreta wastes to earthworm-fertilizer as well as bio-degradation of food wastes, agricultural residue mixed with human excreta and animal manure to fertilizer. The approach was mainly reduction together with repair, and some refurbish. The outcome of the Circular Economy approach in terms of value addition on recycle and repair solid wastes were approximately 0.3 Million US a year for Suan Kaew Temple. For both monasteries has been attained Sustainable Development Goal. The research also studied for the factors influencing towards Resulted Base Management. Leader and leadership of the abbots of both temples are the main factors influencing the people to cooperate for solid wastes management by CE approach
The Effect of Shear Connectors on Cold-Formed Steel as Hybrid Beam Reinforcement
Full text linkHybrid beams are critical components in structural engineering, often reinforced with high-tensile-strength materials that surpass conventional reinforcement bars. Cold-Formed Steel (CFS) is a commonly utilized material in this context, offering enhanced structural performance, durability, and load-bearing capacity. However, previous studies indicate that the incorporation of the CFS in hybrid beams often leads to a strength reduction of approximately 50% compared to theoretical expectations. This discrepancy is primarily attributed to slippage between the CFS and concrete, resulting from the smooth surface texture of the CFS, which limits effective bond formation. To address these challenges, shear connectors are proposed to enhance the CFS-concrete bond, aiming to boost load-carrying capacity. Therefore, this study aims to investigate hybrid beams reinforced with the CFS, focusing on ultimate load, deflection, ductility, and failure patterns. Six beams, varying in the CFS shape and shear connector type, underwent 3-point flexural testing. The results showed an impressive increase in ultimate load, of approximately 87.33%, and notable deflection reductions, ranging from 15.4% to 81.9%, compared to control beams. However, beam ductility decreased significantly, with the largest reduction observed at 78.83%, while flexural failure remained the predominant mode across all specimens
Development of 2.4 GHz/3.5 GHz Bowtie Slot Antenna for 5G Communication System
Full text linkDriven by the rapid growth and advancements in 5G communication, this research presents the the design, development, and optimization of of dual-band bowtie slot antenna integrated with asymmetrical coplanar waveguide (ACPW) and defected ground structure (DGS). Several combinations and different shape of DGS, such as rectangular and circular slots were studied and compared in this research work. Operating at the crucial Wi-Fi frequency (2.4 GHz) and 5G frequency (3.5 GHz), the antenna\u27s performance, particularly the reflection coefficient, was significantly improved by the inclusion of the DGS. A parametric study confirmed the DGS\u27s positive impact on the simulated impedance matching, reflection coefficient (reaching almost -70 dB in all design with DGS) and bandwidth. The best resuts were given by the bowtie slot antenna integrated with rectangular and circular slots, the reflection coefficient is -70.1 dB (2.4 GHz) and -59.5 dB (3.5 GHz). The -10 dB bandwidths are 602 MHz (2.4 GHz) with fractional bandwidth around 25% and 848 MHz (3.5 GHz) with fractional bandwidth around 24.2%. It was found that the excellent reflection coefficient performance is due to the disruption of surface current distribution caused by the defected structure on the ground plane. The surface current was forced to flow surrounding the DGS, causing it to peak along the DGS edges. Placement of the DGS is also important as it was found that positioning it under the feedline helps to minimize the antenna’s mutual coupling
Gain Enhanced On-chip Monopole Antenna Utilizing Dual Rectangular Patch Artificial Magnetic Conductor at 5.8 GHz
Full text linkThe rising popularity of chip-based wireless devices has incited greater attention in on-chip antenna (OCA) technology due to its compact size, low power consumption, and ease of integration into footprint chip-size transceivers. However, OCAs face challenges such as low gain, poor radiation efficiency, and a distorted radiation pattern due to the inherited low resistivity, and high permittivity lossy silicon substrate. This study introduces the dual-rectangular patch (DRP) structured artificial magnetic conductor (AMC) for the enhancing the performance of OCA. Thus, investigates the effect of the gain, and radiation efficiency of the proposed design. A DRP-AMC was developed as a modified AMC reflective surface, optimized to boost the gain and characteristic of the antenna at 5.8 GHz. To assess the design performance, the antenna prototype is fabricated and measured. As a result, an increase gain of 40.2% compared to the non-AMC-inspired model and 29.2% over the single-rectangular patch (SRP) model. This improvement is attributed to the DRP-AMC\u27s performance, making this antenna suitable for Wi-fi 6, RFID, and WiMAX applications at 5.8 GHz
Comparative Analysis of AlN Thin Film Uniformity on 2-Inch and 4-Inch Si Wafers Prepared by Magnetron Sputtering
Full text linkAluminium nitride (AlN) is one of most investigated III-V materials for advanced electronics application. This study is a comparative analysis on the AlN thin film deposited on 2-inch and 4-inch Si wafers using radiofrequency (RF) magnetron sputtering. This study investigates the uniformity of AlN thin films deposited on 2-inch and 4-inch Si wafers, analysing variations in crystal structure, surface morphology, and film thickness to assess the impact of wafer size on film consistency. The deposited AlN thin films were characterized using X-ray Diffraction (XRD), surface profiling and field emission – scanning electron microscope (FE-SEM). It was found out that the films had a preferred orientation of (100) and had a very good match across the 2-inch wafers but were off slightly at the edges of the 4-inch wafers. Thickness measurements also showed good uniformity as evidenced by coefficient of variation (CV) values below the 10% industry standard and FE-SEM analysis of smooth, defect-free films with uniform morphology. In conclusion, these results confirm that the wafer size is very crucial to produce uniform ad high quality AlN thin films across the wafer
Computer Vision-Based Security System for Monitoring The Use of Personal Protective Equipment (PPE) In Workplace Involving Production Machinery
Full text linkOccupational safety is crucial as workers\u27 lives are directly or indirectly influenced by safety policies in the workplace. One significant cause of workplace accidents is the failure of workers to wear personal protective equipment (PPE). Advancements in technology now enable PPE monitoring through computer vision. This research aims to develop a computer vision-based security system to address the negligence of wearing PPE in work environments with production machinery. If the system detects that a worker is not wearing the required PPE, it issues a warning and shuts down the production machine. The system employs computer vision algorithms, specifically SSD MobileNet V2 FPNLite 320x320 and SSD MobileNet V2 FPNLite 640x640 models, trained to identify individuals, helmets, safety suits, and gloves. The system successfully detects the specified PPE, issues warnings, and deactivates the production machine, achieving the best accuracy and F1 score values of 0.538 and 0.479, respectively
Hemodynamic Analyses of Different Stent Strut Configurations in the Carotid Artery
Full text linkVascular stents are essential for treating blockages in the carotid artery, as they restore blood flow and diminish the risk of strokes. However, stents with poor strut configuration can disrupt normal blood flow, leading to turbulence and vortex formation, which may result in low shear stress and an increased potential for clot formation. This study explores the hemodynamic effects of three stent designs with distinct hemodynamic profiles: Type 1 (rectangular struts), Type 2 (hybrid cells), and Type 3 (helical pattern). This study examines the effectiveness of specific stent designs in reducing flow disturbances within a Y-shaped carotid artery model, focusing on three critical locations: the proximal inlet, just before bifurcation, and the distal segment of one daughter branch. In this study, the blood was modeled as a non-Newtonian fluid governed by a Carreau-Yasuda viscosity model using ANSYS. Key parameters included an inlet velocity of 0.5 m/s, infinite shear viscosity of 0.0035 Pa·s, and zero shear viscosity of 0.056 Pa·s. The findings indicate that both stent mesh configuration and implantation location significantly influence local flow dynamics that lead to increased recirculation and eddy formation near the bifurcation, while others facilitated smoother flow, thereby decreasing the risk of thrombosis. Type 3 demonstrated superior hemodynamic performance with balanced wall shear stress (WSS) distribution (peak WSS = 3.025 Pa) and minimal flow disruption, suggesting its potential to reduce thrombosis risk compared to Type 1 and 2 designs. This study highlights the importance of integrating advanced stent designs with anatomically informed placement to enhance flow dynamics and minimise thrombus formation