Asian Journal For Convergence In Technology (AJCT) ISSN -2350-1146

Natural Fiber-based Composite Materials to Enhance the Vibration Damping in Automotive Bonnet

2025-12-10T01:36:47-05:00

Vibrations play a major role in causing fatigue and shortening the lifespan of automotive parts. These vibrations mainly stem from the vehicle's design and construction, road conditions, and driving behaviors, which together hinder the performance of various parts. It is crucial to reduce vibrations in key safety components to ensure the overall performance of the vehicle. The quest for enhanced vehicle performance has resulted in a growing interest in utilizing natural fibers to improve vibration damping properties in automotive applications.

Experimental Study on the Performance of a Vapor Compression Refrigeration System Using Alternative Refrigerants

2025-12-10T01:54:27-05:00

This study experimentally examines the performance of a vapor compression refrigeration (VCR) system charged with four refrigerants R134a, R600a, R290, and R1234yf with a dual focus on thermodynamic performance and environmental impact. The investigation covers key indicators such as coefficient of performance (COP), cooling capacity, compressor power consumption, and discharge temperature, along with comparative assessments of volumetric cooling capacity, compressor displacement, and Life Cycle Climate Performance (LCCP). Experimental outcomes indicate that the hydrocarbon options, R600a and R290, provide up to 15% higher COP than R134a while maintaining a markedly lower global warming potential (GWP). Although R1234yf delivers slightly reduced efficiency (about 5–10% lower), it stands out as a viable replacement refrigerant owing to its extremely low GWP (<1) and compliance with current environmental regulations. Overall, the results highlight the trade-offs between efficiency, safety, and sustainability, offering guidance for system designers and policymakers aiming to align refrigeration practices with the Kigali Amendment.

Impact of high-speed Trains on Vibration-Induced Wear and Fatigue in Rail Tracks

2025-12-10T02:11:08-05:00

The global expansion of high-speed trains (HSTs) presents significant challenges related to rail track integrity, particularly concerning vibration-induced wear and fatigue that impact the safety and efficiency of railway systems. This study investigates the effects of HST operations on track deterioration, with a focus on the dynamic behavior of rail structures under high-speed movement. Finite Element Analysis (FEA) simulations and rig tests conducted over millions of loading cycles were used to evaluate stress distribution, vibration frequencies, wear rates, and fatigue life of rail tracks. The findings indicate that increased HST activity leads to higher stress and vibration levels, consequently reducing the fatigue life of rail infrastructure. Mitigation strategies explored in this research include enhanced track support systems, advanced rail materials, vibration-damping instruments, and improved monitoring technologies. The results demonstrate that adopting these techniques can significantly reduce vibration effects and improve rail durability. This study offers valuable insights for rail network operators and engineers in designing and maintaining robust infrastructure capable of withstanding the demands of highspeed rail transport.

Investigation for Impact of Process Parameters on Mechanical Properties of Fused Filament Fabrication Components

2025-12-10T02:24:17-05:00

The purpose of this article is to look at a variety of tactics used in different industries to optimize the operating parameters of 3D printing systems. Fused Deposition Modeling (FDM), one of the most well-known methods, has drawn a lot of interest because of its broad range of applications in fields including die-making and prototype development. FDM creates three-dimensional objects by layering materials one after the other. Because of its great versatility, the technique makes it possible to produce complex geometries that would be challenging to accomplish with conventional manufacturing techniques. However, FDM still has drawbacks with regard to printing speed, production time, and the structural soundness of the printed parts. The quality of the finished product is directly impacted by a number of variables, including the distance between layers, orientation during printing, percentage of internal fill, deposition angle, path width, and layer depth. Determining and modifying the most important factors in accordance with the particular needs of the item being produced is therefore crucial. To tackle these challenges, numerous researchers have explored advanced optimization tools like experimental design approaches, surface response modeling, evolutionary algorithms, neural network models, and fuzzy logic systems. Many academics have investigated cutting-edge optimization tools such as fuzzy logic systems, evolutionary algorithms, surface response modeling, experimental design approaches, and neural network models in order to address these issues. Strength, accuracy, and dependability are some of the important product attributes that are improved by using these instruments. Objective of this work is to present a thorough analysis of the body of research on enhancing FDM results via efficient process parameter adjustment.

Portable EV Charging Portal

2025-12-10T02:32:31-05:00

These days, EVs are everywhere — but charging them without a grid nearby? Still a huge headache. During one of our field trials, we kept facing issues with reliability and power access, which pushed us to try building something different. What came out of that was a compact, foldable solarpowered EV charging setup with lithium battery storage and a custom power conditioning system. The idea is simple: give people the ability to charge EVs on the go — even in remote or emergency areas — using just solar energy. It's got dual input (solar and grid), modular batteries that can be swapped in seconds, and even the potential to link up with blockchain energy credit systems so people can trade or save unused energy. Also, we figured out how to store excess charge during hot sunny days and use that during winters — which is actually super helpful in seasonal climates. The system isn’t perfect, but it works better than we expected in most test scenarios.

Security Aspects of IoT-Enabled Digital Twin Systems Focusing on Challenges Threats and Mitigation Strategies

2025-12-10T03:01:42-05:00

The intersection of the Internet of Things(IoT) and Digital Twin (DT) has made it possible to synchronize physical and virtual systems in real time, bringing noteworthy innovation in sectors like manufacturing, healthcare, transportation, and smart cities. Although this convergence provides unparalleled visibility into operations and predictive accuracy, it also presents a broad range of cybersecurity risks that compromise the integrity, confidentiality, and availability of physical and digital assets. This research paper examines the security environment of IoT-enabled digital twin systems and determines the most common ten vulnerabilities, such as weak or hardcoded passwords, insecure network services, unprotected interfaces, absence of secure update mechanisms, out-of-date components, inadequate privacy protections, insecure data handling, insecure default settings, ineffective device management, and absence of physical hardening. All of these vulnerabilities are considered in light of their actual-world significance, particularly as digital twin systems become part of vital infrastructure and high-stakes industrial processes. In order to counter these threats, the paper suggests ten all- encompassing mitigation plans, including enforcing one-time credentials, limiting access to high-risk networks, enabling endpoint authentication and access control, validating secure firmware updates by means of digital signatures, substituting legacy components, and enforcing end-to-end encryption and secure boot protocols. The study highlights the importance of a lifecycle-security strategy that extends from deployment to decommissioning of devices, promoting proactive security steps such as continuous monitoring, secure onboarding, data minimization, and accountability on the user's part. By combining technical understanding with real-world security solutions, this research delivers an effective framework for securing next-gen digital twin environments. It highlights the need for stakeholders, from developers and makers to system integrators and policymakers, to integrate cybersecurity into the foundational design and deployment plans of IoT-connected digital twins. As Industry 4.0 evolves at a breakneck pace, no longer can it be optional but a vital necessity for secure and sustainable digital transformation.

Dual Axis Sun Tracking System with Weather Monitoring System

2025-12-10T03:13:44-05:00

A world is now move towards renewable energy source due to various factors like pollution and cost of nonrenewable energy sources. One of the main renewable energy sources is Sun. In this project Arduino based Dual-axis solar tracking system proposed in order to get maximum solar energy. The Arduino is used to give command to rotate the solar panel. Solar trackers are used to improve the power gain from solar energy. Solar power is changes due to the seasonal variation and tilting of earth which change the position of the sun in the sky. In this regard dual axis solar tracking is practically implemented and performance is compared with fixed mount and single axis solar tracking system. Finally, project result that proposed method gives better efficiency compared to fixed mount and single axis solar tracking system

Screw Hydropower Turbine For Power Generation

2025-12-10T03:23:38-05:00

The intention of any hydroelectric generating station is to convert potential energy associated with the water in a watercourse passing the station into electrical energy. Industry has broad experience in the field of screw pumps and screw pump installations. For nearly 100 years Micro-hydro power plants has designed, manufactured, supplied, erected and maintained many types of screw pump configurations. Since the early eighties Micro-hydro power plants had available a fully automated screw pump selection This project is used to select the optimum screw pump for a particular application with least or zero head. This can produce some electricity using small generator.

A hybrid Multi-Response Optimization for the Best Biofuel Blend Selection using AHP–TOPSIS Methods

2025-12-10T03:31:11-05:00

The selection of an appropriate biofuel blend is a multi-criteria decision-making (MCDM) dilemma based on various qualitative and inconsistent criteria, which are crucial for determining the feasibility of new energy sources. This paper presents a hybrid methodology using the analytical hierarchy process (AHP) to compute the relative criteria weights, whereas the technique for order of preference by similarity to ideal solution (TOPSIS) was used to rank the available alternatives. The results indicated that brake thermal efficiency (BTE) and nitric oxides (NOx) are the two most important criteria for rating the performance of a biofuel blend. The following preferences were attained for the blends by using the hybrid AHP–TOPSIS method: BD20CeO200 > BD100CeO200 > D > BD20 > BD100. Hence, after using the hybrid MCDM methods for various biofuel blends, the BD20 with Cerium oxide nanoparticles (200 ppm) was selected as the best biofuel blend for operating CI engines.

Design and Evaluation of an Energy-Efficient Regenerative Braking System

2025-12-10T04:48:09-05:00

Regenerative braking systems (RBS) offer a promising solution to improve energy efficiency in modern electric and hybrid vehicles by recovering kinetic energy otherwise lost as heat during braking. This study presents the design, simulation, and experimental validation of a prototype regenerative braking system aimed at maximizing energy recovery and minimizing wear on conventional brake components. A stainless steel disc brake was designed using Fusion 360 and analyzed for thermal and structural performance under braking conditions using ANSYS Workbench. The prototype integrates a 775 DC motor functioning as a generator, converting braking energy into electrical output, which is visualized using an LED load indicator. Simulation results indicate that the disc brake reaches a peak steady-VWDWHWHPSHUDWXUHRIDSSUR[LPDWHO\ௗ&ZLWK maximum heat flux observed at the brake pad contact zone, validating the model’s thermal behavior. Experimental testing demonstrated successful energy recovery, with an output voltage UDQJLQJ EHWZHHQ ௗ9 DQG ௗ9 DW PRWRU VSHHGV RI – ௗ5307KHILQGLQJVFRQILUPWKHIHDVLELOLW\RIWKHSURSRVHG system for small-scale energy harvesting applications and provide a foundation for further development of efficient and adaptable regenerative braking systems for sustainable vehicle technologies.

Deep Learning-Enabled Robotic Disassembly for Sustainable E-Waste Recycling

2025-12-10T04:56:42-05:00

Electronic waste is increasing at a pace that exceeds current recycling capabilities. Most recycling facilities still rely on slow, hazardous manual labor or rigid robotic systems limited to specific device types. This study presents a deep learning–enabled robotic disassembly framework that integrates real-time object detection using YOLOv5 and semantic segmentation using U-Net with a modular robotic arm capable of dynamic tool switching.

A balanced dataset of twelve thousand four hundred fifty annotated images covering six device types and nine component categories was developed and evaluated using fivefold cross-validation to ensure robustness. The integrated system achieved a mean average precision of ninety-four point six percent for detection and a disassembly success rate of ninety-two point three percent, processing devices forty percent faster than manual operations.

When tested on one hundred fifty mixed e-waste devices, the system consistently maintained ninety-six point one percent material purity, outperforming both rule-based robotic systems and detection-only baselines. By merging computer vision intelligence with adaptive robotic mechanics, this work demonstrates a scalable path toward faster, safer, and more sustainable electronic waste recycling.