Engineering Science and Technology-An International Journal-Jestech最新文献

{"title":"Neural network-based adaptive super-twisting sliding mode control for hybrid magnetic levitation system with external disturbance","authors":"Menglei Zhang ,&nbsp;Liwei Zhang ,&nbsp;Lu Shen","doi":"10.1016/j.jestch.2025.102177","DOIUrl":"10.1016/j.jestch.2025.102177","url":null,"abstract":"<div><div>Hybrid magnetic levitation system compared with pure electromagnetic levitation system, because of the introduction of permanent magnets, the hybrid levitation system is more sensitive to parameter uncertainty and external disturbance. The traditional control strategy is unable to meet the operational requirements of the hybrid levitation system. To solve this problem, an adaptive super-twisting sliding mode controller based on a neural network is designed to address unknown parameters and external disturbance. Firstly, this study analyses the impact of the introduction of permanent magnets on the controllability and safety of the system. An adaptive sliding mode controller is designed. To address the issue of model parameter uncertainty, a neural network is employed to fit the unknown quantities. Then, to further solve the chattering issue on the platform in the face of disturbances, an adaptive super-twisting controller was developed and designed based on the neural network controller. Finally, related experimental verification was carried out on a hybrid levitation experimental platform. The experimental results indicate that the proposed control strategy is able to maintain stable levitation of the platform even under external disturbance and ensure the airgap tracking and levitation safety of the system.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"70 ","pages":"Article 102177"},"PeriodicalIF":5.4,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Selection of the central composting facility for organic wastes through the Bayesian best worst method and Geographic information system incorporation: The case of Istanbul","authors":"Mustafa Güler ,&nbsp;Mesut Samastı ,&nbsp;Melih Yücesan ,&nbsp;Muhammet Gül ,&nbsp;Erkan Çelik ,&nbsp;Miraç Nur Ciner ,&nbsp;Ömer Algorabi","doi":"10.1016/j.jestch.2025.102175","DOIUrl":"10.1016/j.jestch.2025.102175","url":null,"abstract":"<div><div>The rapid increase in municipal solid waste (MSW) generation, driven by population growth and unplanned urbanization, has made the location of organic waste collection and disposal facilities a critical issue for metropolitan cities. Improper waste management practices threaten environmental sustainability, human health, and urban futures. This study applies multicriteria decision-making (MCDM) methods to identify the optimal placement for a central composting facility in Istanbul. A novel MCDM mechanism was developed, building on existing methods and addressing a gap in the literature. While determining the criteria, academic studies on this subject were researched in depth and the criteria used in these studies were brought together to obtain 28 criteria. The study assessed 28 criteria using the Bayesian Best-Worst Method (BWM) to determine their relative importance. These weights were then integrated into a Geographic Information System (GIS) to produce a suitability map, highlighting the most appropriate locations for the facility. Based on this analysis, the Çatalca Karacabey region was identified as the optimal site, ensuring reduced environmental impact and improved efficiency in organic waste management. The study contributes both theoretically and practically to the field, offering a robust framework for sustainable waste facility siting and providing actionable insights for urban governance. The study provides valuable insights for facility siting and urban governance, while highlighting areas for future research.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"70 ","pages":"Article 102175"},"PeriodicalIF":5.4,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144908692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The nonlinear transient thermoelastic analysis of functionally graded sandwich plates rested on partially elastic foundations","authors":"Ngoc-Tu Do ,&nbsp;Trung Thanh Tran ,&nbsp;Quoc Hoa Pham ,&nbsp;Vu Khac Trai","doi":"10.1016/j.jestch.2025.102174","DOIUrl":"10.1016/j.jestch.2025.102174","url":null,"abstract":"<div><div>This paper presents a nonlinear transient thermoelastic analysis of functionally graded sandwich (FGSW) plates with a metal core and FGM skin layers resting on partially elastic foundations (p-EF). A refined first-order shear deformation theory (r-FSDT) combined with Kármán-type geometric nonlinearity is employed, formulated using a weak-form Q4 finite element. The study incorporates temperature conduction through the plate thickness and accounts for temperature-dependent material properties, capturing realistic thermal effects. The governing equations are derived via Hamilton’s principle and solved by the Newmark-β time integration method coupled with Newton–Raphson iteration. The proposed approach’s accuracy is verified against available benchmark solutions. The novelty of this work lies in systematically investigating the nonlinear transient response of FGSW plates under dynamic loading in the presence of p-EF, which has received limited attention in the literature. Furthermore, a detailed parametric study examines the effects of geometrical parameters, material properties, foundation characteristics, and boundary conditions (BCs) on the dynamic behavior of FGSW plates.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"70 ","pages":"Article 102174"},"PeriodicalIF":5.4,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144908691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PV-integrated coordinated control for enhanced grid performance in next-gen EV charging systems","authors":"Umashankar Subramaniam ,&nbsp;S Saravanan ,&nbsp;K.R.M Vijayachandrakala ,&nbsp;Sivakumar Selvam","doi":"10.1016/j.jestch.2025.102176","DOIUrl":"10.1016/j.jestch.2025.102176","url":null,"abstract":"<div><div>This study aims to contribute to the United Nations’ Sustainable Development Goal (SDG) 7, which promotes affordable and clean energy by investigating the potential of solar photovoltaic systems (PVS) integration into EV charging infrastructure in evolving power networks for mutual benefits. The objective is to develop a coordinated control strategy for PVS-integrated EV charging stations that ensures seamless grid interaction with enhanced power quality. It focuses on modelling and coordinated control to achieve stable grid integration. Two distinct EV charging stations are considered in this work. Station 1 employs a conventional unidirectional power flow model, drawing power from the three-phase grid’s point of common coupling (PCC). The second station utilizes a PVS-based charging infrastructure connected to the PCC via a three-phase inverter. It facilitates power exchange with the distribution grid and charging stations, which addresses the reliability concerns of the PVS-based charging infrastructure. Coordinated control of the overall system is achieved through the dual Second-Order Generalized Integral (SOGI) based voltage and load current processing loops. This research ensures that the proposed dual SOGI-based controller maintains a unity power factor, reduces total harmonic distortion to below 3%, and eliminates the need for external filters meeting high grid power quality by ensuring power transfer between the grid and any charging stations. The PVS system mitigates harmonics and fulfills the reactive power demands of station 1 and local loads, obviating the necessity for separate filters and compensators. The developed control algorithm was tested on a hardware prototype under various loads and PV side conditions, demonstrating effective harmonics mitigation, reactive power compensation, and grid current balancing. The extensive hardware analysis conducted in steady state and dynamic operating modes confirms that the presented system improves voltage stability by over 20% and cuts network losses by more than 25%, establishing its effectiveness for next-generation sustainable EV infrastructure.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"70 ","pages":"Article 102176"},"PeriodicalIF":5.4,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144896356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Practical implementation of obstacle avoidance strategies in the truly multi-vehicle Autonomous Robot Racing Competition","authors":"Jiyou Shin ,&nbsp;Jongsoo Han ,&nbsp;Kyeongbeen Park ,&nbsp;Myeongyun Doh ,&nbsp;Tuan Luong ,&nbsp;Nabih Pico ,&nbsp;Hyungpil Moon","doi":"10.1016/j.jestch.2025.102164","DOIUrl":"10.1016/j.jestch.2025.102164","url":null,"abstract":"<div><div>This paper introduces a practical approach to handle object tracking and path planning methodology for real-world multi-vehicle autonomous racing, interacting with more than 8 vehicles. Unlike previous autonomous racing systems, which primarily dealt with single or dual races, our proposed algorithm successfully handles real-world multi-vehicle scenarios, demonstrated in the “Autonomous Robot Racing Competition”(ARRC) with nine vehicles. The perception module utilizes a 16-channel LiDAR sensor to detect multiple obstacles on the racing track. To overcome the challenges posed by sparse point clouds, we introduce an orientation compensation method of multi-object detection on sparse point cloud conditions by applying the Extended Kalman Filter(EKF) tracking method. Our algorithm demonstrated 99.6% of the overall orientation accuracy compared to learning based methods that use 64-channel or higher resolution LiDAR. Moreover, it performed better when recognizing small objects with fewer points. The behavior predictive motion planning algorithm predicts dynamic multiple opponents’ trajectories and generates candidate paths considering two racing lanes and the states of other multiple vehicles applying the Frenet-Frame. The proposed algorithm is tested in a custom CARLA simulator for 20 scenarios with multi-vehicle interaction, and its effectiveness is demonstrated in the real-world 2023 ARRC. Our algorithm achieves safe overtaking, avoidance, and following maneuvers through multi-vehicle racing while adhering to the given racing rules.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"70 ","pages":"Article 102164"},"PeriodicalIF":5.4,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144896335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fabrication and thermo-mechanical evaluation of a polyurethane-based porous structure intended for use in robotic gripping applications","authors":"Merdan Ozkahraman","doi":"10.1016/j.jestch.2025.102170","DOIUrl":"10.1016/j.jestch.2025.102170","url":null,"abstract":"<div><div>This study explores the design, manufacturing, and mechanical performance of a polyurethane-based porous component intended for use in robotic gripping applications. A sacrificial molding technique was employed, utilizing 3D-printed polyvinyl alcohol (PVA) lattice structures to form a counter gyroid framework. After infusing the lattice with polyurethane resin and dissolving the PVA in water, a lightweight and flexible gripper structure was obtained. The mechanical behavior of the gripper was evaluated through compression testing at varying temperatures (20 °C, 60 °C, 100 °C, and 140 °C) to analyze its load-bearing capacity, deformation response, and failure mechanisms. The experimental results revealed that while the gripper maintains high mechanical integrity at room temperature, its stiffness and strength decrease significantly with increasing temperature. Force-displacement curves, energy absorption analysis, and thermal imaging further demonstrated the gripper’s thermal sensitivity and potential application limitations in high-temperature environments. A flame resistance test confirmed the material’s low thermal conductivity and partial structural resilience under direct heat exposure, suggesting its potential suitability for handling moderately hot objects or applications involving short-term thermal exposure in industrial and soft robotics settings. Despite its flexibility and adaptability, the gripper’s limited thermal stability necessitates further material improvements to extend its usability under sustained high-temperature conditions.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"70 ","pages":"Article 102170"},"PeriodicalIF":5.4,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144896334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"QSAC: Quantum-assisted Secure Audio Communication using quantum entanglement, audio steganography, and classical encryption","authors":"Md. Raisul Islam Rifat ,&nbsp;Md. Mizanur Rahman ,&nbsp;Md. Abdul Kader Nayon ,&nbsp;Md Shawmoon Azad ,&nbsp;M.R.C. Mahdy","doi":"10.1016/j.jestch.2025.102167","DOIUrl":"10.1016/j.jestch.2025.102167","url":null,"abstract":"<div><div>The emergence of quantum computing poses a significant security threat to the current classical cryptography system since it has the potential to outperform the current classical computer in some specific tasks due to its unique principle of operation. This necessitates finding a method that is resistant to quantum computers to securely transfer information. This research addresses these challenges by proposing a novel method combining quantum key distribution (QKD), specifically the E91 protocol, with the classical encryption-authentication protocol ChaCha20-Poly1305, and concealing information within another message through steganography to securely transfer audio messages. A shared secret key is created between the communicating parties using E91 QKD, which exploits the stellar protection of quantum entanglement against eavesdropping. The shared key is hashed through the SHA–3 hash function to generate a fixed-length, high-entropy symmetric key. The audio message is hidden inside another audio signal through steganography. The steganographic signal is encrypted using ChaCha20-Poly1305 AEAD in order to provide another layer of obfuscation as well as a means to verify integrity. Through rigorous experiments, we validated the robustness of the proposed methodology in both classical and quantum attacks. The processing of secret audio signals of varying duration (00:01:32 to 00:01:36) exhibits consistent encryption results. The encrypted stego audios show high randomness, with an average entropy of 15.9984, an average correlation of <span><math><mrow><mn>1</mn><mo>.</mo><mn>4627</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>5</mn></mrow></msup></mrow></math></span>, an average UACI of 49.9977%, and an average NSCR of 99.9985%. We demonstrated the safety of the shared key using the CHSH inequality test, where in the presence of an eavesdropper, the CHSH value is much less than <span><math><mrow><mn>2</mn><msqrt><mrow><mn>2</mn></mrow></msqrt></mrow></math></span>. In addition, the integrity of the secret audio is also validated through the verification of the authenticator tag generated during the encryption process. Our research offers a novel framework for secure audio transmission, combining classical encryption and authentication methods with QKD to enhance confidentiality, integrity, and resilience against eavesdropping and tampering, ensuring robust end-to-end security.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"70 ","pages":"Article 102167"},"PeriodicalIF":5.4,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144886129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Extended modeling for wind turbines with application to hybrid renewable energy systems","authors":"Shifeng Jia,&nbsp;Zhi-Wei Gao","doi":"10.1016/j.jestch.2025.102168","DOIUrl":"10.1016/j.jestch.2025.102168","url":null,"abstract":"<div><div>In the existing wind turbine benchmark models, generators are usually represented as a simplified first-order inertia model, which does not meet practical engineering scenarios. Moreover, fluctuations in machine parameters always exist in complex engineering environments which are not fully considered in the existing models. Motivated by the above, it is of significance to develop a wind turbine model capable of describing more practical situations. In this paper, a nonlinear extended wind turbine model is established which is further applied to a hybrid energy storage and hydrogen production system. Specifically, a comprehensive nonlinear extended model is proposed where ultra-local models are used to redesign control strategies for both machine side and grid side. A super-helical integral sliding-mode-observer is designed to estimate rotational speed and electrical angle in the presence of machine parameter mismatches and disturbances, so that the robustness of the model is enhanced. The wind turbine model is applied to a hybrid energy storage and hydrogen production system, serving as the supply side, which ensures stable power delivery based on control strategies for both machine side and grid side. The effectiveness of the proposed methods is demonstrated through co-simulation studies using MATLAB/SIMULINK and FAST and hardware-in-loop experimental platform.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"70 ","pages":"Article 102168"},"PeriodicalIF":5.4,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144867058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fuzzy logic-based simulation of a weighted integrated GNSS receiver for mitigating blocking interference effects","authors":"K. Bahmani,&nbsp;M.R. Mosavi,&nbsp;A. Sadr","doi":"10.1016/j.jestch.2025.102171","DOIUrl":"10.1016/j.jestch.2025.102171","url":null,"abstract":"<div><div>The aim of this paper is to enhance the accuracy and speed of receivers in integrated Global Navigation Satellite System (GNSS) systems, ensuring the ability to maintain precise and high-quality positioning even in blocking conditions. To this end, a novel approach is proposed to improve the performance of receivers in integrated GNSS systems, which includes two-stage acquisition, fuzzy logic, and a weighting mechanism based on the Weighted Least Squares (WLS) algorithm. In this method, a two-stage acquisition process is initially employed to achieve rapid and accurate acquisition. Then, the number of visible satellites, the Carrier-to-Noise Ratio (CNR) extracted during the tracking phase, and the Dilution of Precision (DOP) are used as inputs to the fuzzy logic membership function. Through fuzzy rules, the WLS weighting coefficients are optimally determined. Experimental results indicate that the WLS method with fuzzy logic coefficients significantly enhances system performance. Specifically, an average improvement of 36.50% in Root Mean Square (RMS) error and a 31.10% reduction in Geometric Dilution of Precision (GDOP) have been observed compared to the Least Squares (LS) method.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"70 ","pages":"Article 102171"},"PeriodicalIF":5.4,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144860462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lightweight design and structural analysis of a Bi-articulated bus: Experimental measurements and FEM validation","authors":"Ahmet Özcan ,&nbsp;İbrahim Yönel ,&nbsp;Celalettin Yuce","doi":"10.1016/j.jestch.2025.102169","DOIUrl":"10.1016/j.jestch.2025.102169","url":null,"abstract":"<div><div>The concept of sustainability prioritizes energy efficiency, especially in transportation, which directly impacts environmental sustainability. This study presents, for the first time, the lightweight design and structural performance of a 25-meter, three-section, double-articulated bus body frame through a hybrid methodology that integrates experimental road data with finite element (FE) validation. A finite element model was created and analyzed under various conditions. Lightweighting studies were performed using topology optimization, design modifications, and different materials. Data from real road conditions were collected and compared with simulation results, achieving up to 93% correlation at specific points. As a result, a 14.1% weight reduction was achieved in the bus body frame without compromising safety or passenger capacity. This lightweighting contributes significantly to sustainable transportation by reducing emissions over the vehicle’s lifetime.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"70 ","pages":"Article 102169"},"PeriodicalIF":5.4,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144852468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}