Publications
Comparative Analysis of Electrode Performance and Thermal Treatments in SMAW of Dissimilar Metal Joints
Dec 29, 2024Journal International Journal of Heat and Technology
Publisher International Information and Engineering Technology Association
DOI 10.18280/ijht.420636
Issue 6
Volume 42
AISI 316 stainless steel and ASTM A516 alloy steel weldment characteristics investigated according to filler materials and post weld heat treatment performance. The welding was performed using shielded metal arc welding (SMAW) with two types of filler metals, E7018 and E310, and PWHT was carried out at three temperatures: 600℃, 630℃, and 650℃. Welded joints' mechanical performance encompassed tensile and bending tests, and micro-hardness measurements, in addition to microstructural and fractographical examination employed for this purpose. Results evidenced that tensile strength and elongation of welded steel using E7018 electrode were 518 MPa and 28.1%, respectively, which showed relatively high strength. The results show steel welded with E310 electrode had higher mechanical properties, with the best balance between strength and ductility. In addition, post welding heat treatment improving mechanical properties by minimizing residual stress and refining grain structure. E7018 welded joints failure load increased to 86 KN after PWHT and the ultimate tensile strength increased to 525 MPa, further, microstructure analysis of optical microscope and scanning electron microscope shows PWHT has good effect on ductility improvement and hardness reduction. New microstructures with finer grain size and increased ferrite phase observed, which enhanced tensile and bend strength. ©2024 The authors.
Enhanced Total Harmonic Distortion Optimization in Cascaded H-Bridge Multilevel Inverters Using the Dwarf Mongoose Optimization Algorithm
Oct 7, 2024Journal Journal of Robotics and Control (JRC)
Publisher Department of Agribusiness, Universitas Muhammadiyah Yogyakarta
DOI 10.18196/jrc.v5i6.23548
Issue 6
Volume 5
Total harmonic distortion (THD) is one of the most essential parameters that define the operational efficiency and power quality in electrical systems applied to solutions like cascaded H-bridge multilevel inverters (CHB-MLI). The reduction of THD is crucial due to the fact that improving the system’s power quality and minimizing the losses are key for performance improvement. The purpose of this work is to introduce a new DMO-based approach to optimize the THD of the output voltage in a three-phase nine-level CHB-MLI. The proposed DMO algorithm was also subjected to intense comparison with two benchmark optimization techniques, namely Genetic Algorithm and Particle Swarm Optimization with regards to three parameters, namely convergence rate, stability, and optimization accuracy. A series of MATLAB simulations were run to afford the evaluation of each algorithm under a modulation index of between 0.1 and 1.0. The outcome of the experiment amply proves that in comparison with THD minimization for the given OP, the DMO algorithm was significantly superior to both RSA-based GA and PSO algorithms in their ability to yield higher accuracy while requiring lesser computational time. Consequently, this work could expand the application of the DMO algorithm as a reliable and effective means of enhancing THD in CHB-MLIs as well as advancing the overall quality of power systems in different electrical power networks. © 2024 Department of Agribusiness, Universitas Muhammadiyah Yogyakarta. All rights reserved.
Enhancing Harmonic Reduction in Multilevel Inverters using the Weevil Damage Optimization Algorithm
Apr 1, 2024Journal Journal of Robotics and Control (JRC)
Publisher Department of Agribusiness, Universitas Muhammadiyah Yogyakarta
DOI 10.18196/jrc.v5i3.21544
Issue 3
Volume 5
In this study, we investigate the efficacy of the newly developed Weevil Damage Optimization Algorithm (WDOA) for addressing harmonic distortion in multilevel inverters. Specifically, harmonics of the fifth and seventh orders are targeted for elimination in a seven-level cascaded multilevel inverter, while harmonics of the fifth, seventh, eleventh, and thirteenth orders are addressed in an eleven-level cascaded multilevel inverter. Through simulation studies encompassing different modulation index values, we demonstrate the effectiveness of the WDOA optimization algorithm in selectively removing harmonics and reducing overall harmonic distortion. While the results showcase promising outcomes, further quantitative metrics and comparative analysis are warranted to fully evaluate the algorithm’s performance and its potential implications for practical applications in multilevel inverter systems. © 2024 Department of Agribusiness, Universitas Muhammadiyah Yogyakarta. All rights reserved.
Wireless Power Transfer for Smart Power Outlet a Send mail to Taha T.A.; b Send mail to Fadhil M.;
Nov 25, 2023Journal ISAS 2023 - 7th International Symposium on Innovative Approaches in Smart Technologies, Proceedings
Publisher IEEE
DOI 10.1109/ISAS60782.2023.10391618
Wireless power transmission, based on electromagnetic principles, involves delivering electrical energy from a power source to an electrical load without physical conductors. This technology is precious when wires are impractical, unsafe, or unfeasible. In wireless power transmission, the paramount consideration is efficiency. Ensuring that a substantial portion of the energy generated reaches the intended receiver(s) is crucial for optimizing economic viability and minimizing power loss during transmission. Conventional power outlet sockets, often serving as extension points for multiple devices, are standard fixtures in small offices and homes. However, their wired nature limits distance introduces clutter, and raises safety concerns. Addressing these drawbacks, this paper presents a wireless power transfer solution - an intelligent power outlet. This innovative outlet is powered via wireless transmission, utilizing primary and secondary coils. Furthermore, the intelligent power outlet can be conveniently toggled ON/OFF using a remote control, enhancing its functionality and practicality.