Simulation Modelling Practice and Theory最新文献

{"title":"A multi-agent system simulation of job shop scheduling with human consideration: A comparative analysis of AGVs and AIVs","authors":"Kader Sanogo ,&nbsp;Abdelkader Mekhalef Benhafssa ,&nbsp;M’hammed Sahnoun","doi":"10.1016/j.simpat.2024.103060","DOIUrl":"10.1016/j.simpat.2024.103060","url":null,"abstract":"<div><div>The manufacturing landscape is undergoing a paradigm shift towards Industry 5.0, emphasizing human-centricity in a collaborative environment between humans and robots. In this context, the job shop scheduling problem (JSSP) remains a critical aspect of workshop management, optimizing task sequencing to minimize the overall completion time (makespan). Traditionally, autonomous and guided vehicles (AGVs) have been employed for tasks transportation within workshops. However, their limited flexibility and reliance on dedicated pathways hinder seamless integration with human workers. Autonomous and intelligent vehicles (AIVs) emerge as a promising alternative, offering enhanced adaptability and the ability to navigate alongside humans in shared spaces. Despite the emphasis on human-centricity as a foundation of manufacturing in Industry 5.0, research explicitly considering human factors in JSSPs remains scarce. Hence, this study delves into the transition from AGVs to AIVs within the context of JSSP, evaluating their impact on the makespan and the influence of human presence on AIV operations. Employing a multi-agent system (MAS)-based simulation approach, we model the stochastic human behaviour using discrete-time Markov chains (DTMC) and investigate the impact of the interactions between AIVs and human workers within shared movement corridors. Our findings highlight the potential of AIVs to enhance workshop efficiency over AGVs, and their effectiveness in human-centred manufacturing policy, paving the way for more collaborative and adaptable production systems.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"139 ","pages":"Article 103060"},"PeriodicalIF":3.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of the multi-grid modelling method to pedestrian social group dynamics through a bottleneck","authors":"Yangjian He ,&nbsp;Qingxin Shi ,&nbsp;Libi Fu ,&nbsp;Qiyi Chen ,&nbsp;Chenxin Shen ,&nbsp;Yu Zhang ,&nbsp;Yongqian Shi ,&nbsp;Jacqueline T.Y. Lo","doi":"10.1016/j.simpat.2024.103049","DOIUrl":"10.1016/j.simpat.2024.103049","url":null,"abstract":"<div><div>There is a high proportion of social groups in crowds. The influence of social groups on crowd mobility is particularly evident in emergency situations and in confined movement environments. However, studies on the characteristics of social group movement through a bottleneck with different widths are limited. Therefore, the computation and simulation are performed in a corridor with a bottleneck involving individuals and three types of groups (namely two-person, three-person and four-person groups) using a modified multi-grid model. The original multi-grid model is modified by introducing interactions between pedestrians, avoidance behavior and group behavior, and validated by data from a controlled experiment. It is found that the group configuration can be adjusted to the changing scenarios during the passing movement. The movement efficiency and level of walking comfort for pedestrians are significantly improved in wider bottlenecks. Passing efficiency is evidently increased and congestion is reduced, when social groups occupy a large proportion of the crowd in a narrow bottleneck. These numerical findings may provide new insights for analyzing nonlinear pedestrian social group dynamics.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"139 ","pages":"Article 103049"},"PeriodicalIF":3.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"2-D deployment of aerial base stations: A simulation model to provide voice communication","authors":"Gabriela Rodríguez-Cortés ,&nbsp;Anabel Martínez-Vargas ,&nbsp;MA Cosío-León ,&nbsp;Daniela M. Martínez ,&nbsp;Oscar Montiel","doi":"10.1016/j.simpat.2024.103048","DOIUrl":"10.1016/j.simpat.2024.103048","url":null,"abstract":"<div><div>Unmanned aerial vehicles (UAVs) offer a potential alternative for providing voice services in areas where communication is disrupted due to natural disasters. These UAVs can be configured as aerial base stations (ABSs), enabling the deployment of a temporary communications network. However, communication networks based on ABSs pose several significant challenges. One of these challenges involves addressing interruptions or limitations in network coverage caused by natural disasters. In such situations, there is a high likelihood that users within the affected area may be unable to communicate due to a lack of coverage. This is a complex problem because it depends on factors, such as the mobile user locations, the characteristics of the air-to-ground channel, and geographical details of the area. In this work, we propose an optimization model to determine the placement of a set of ABSs within a limited disaster area that maximizes the probability of successful voice services (PSVSs). This optimization model integrates a network evaluation model that analyzes the wireless environment at a specific time. The network evaluation model utilizes two-ray and Rayleigh channel models, enabling the simulation of a worst-case scenario for wireless communication systems. We evaluate the proposed optimization model using the (1+1)-evolution strategy with a one-fifth success rule. We explore various parameter configurations to understand their impact on algorithm performance. This analysis helps identify the configuration of the optimization model that yields the maximum PSVSs. Simulation results indicate that by appropriately configuring the evolution strategy algorithm and comparing random ABS locations with those determined ABS locations by the evolution strategy algorithm, the PSVS can be enhanced by an average of 60%.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"139 ","pages":"Article 103048"},"PeriodicalIF":3.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of oil capture characteristics and global sensitivity of radial oil scoops with different blade radius differences for high-speed bearings","authors":"Chi Zhang ,&nbsp;Le Jiang ,&nbsp;Yaguo Lyu ,&nbsp;Wenjun Gao ,&nbsp;Yewei Liu ,&nbsp;Zhenxia Liu","doi":"10.1016/j.simpat.2024.103057","DOIUrl":"10.1016/j.simpat.2024.103057","url":null,"abstract":"<div><div>Aero-engines that employ under-race lubrication technology offer significant advantages by ensuring adequate lubrication and cooling of the bearings, while also achieving substantial weight reduction and size optimization. The oil capture characteristics, including oil capture efficiency and captured oil amount, in radial under-race lubrication are influenced by the operating and structural parameters of the oil scoop. This study presents a comprehensive investigation of radial oil scoops with varying blade radius differences, combining numerical simulations and experimental investigations. The findings indicate that appropriately reducing the blade radius difference enhances the maximum oil capture efficiency while simultaneously raising the corresponding threshold speed. Among the tested configurations, the design with a 7.5mm radius difference demonstrates the highest oil capture efficiency under most operational conditions. Furthermore, a surrogate model integrated with global sensitivity analysis quantitatively assesses the influence of design parameters on oil capture characteristics, highlighting the injection angle as the most significant factor. Finally, by fitting data on the momentum flux ratio and optimal injection angle, a predictive correlation between these variables is established, with a maximum error of merely within 4%. This comprehensive research contributes to the advancement of radial under-race lubrication systems in aero-engines, leading to optimized designs that enhance overall performance and efficiency.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"139 ","pages":"Article 103057"},"PeriodicalIF":3.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on inversion method for stress characteristics of roadway surrounding rock based on real-time weight measurement of drill cuttings","authors":"Guanghui Wang ,&nbsp;Xiangyu Wang ,&nbsp;Jiaxin Zhao ,&nbsp;Feiteng Zhang ,&nbsp;Honglei Wei ,&nbsp;Jianbiao Bai","doi":"10.1016/j.simpat.2024.103064","DOIUrl":"10.1016/j.simpat.2024.103064","url":null,"abstract":"<div><div>The concentration of internal stress and the accumulation of energy within coal bodies are key factors that can trigger catastrophic events, such as rock bursts and gas outbursts. Therefore, understanding the internal stress characteristics of coal is essential. The cuttings method, a commonly used detection technique, is often employed to reflect the degree of stress concentration in coal bodies. However, there is currently insufficient research on the relationship between the weight of cuttings and the stress of the coal body, making it difficult to quantitatively and accurately represent the actual stress state of the surrounding rock in boreholes. This study investigates the relationship between cuttings weight and coal body stress through both theoretical analysis and numerical simulation. Theoretically, a formula for calculating the weight of cuttings under a uniform stress field was derived, based on an analytical solution for the stress and displacement of surrounding rock in boreholes. The sensitivity of cuttings weight to changes in coal body stress is thoroughly analyzed. From a numerical simulation perspective, a discrete element method for coal drilling is developed, revealing the correlation between cuttings weight and coal body stress under both uniform and non-uniform stress conditions, as well as the impact of initial damage on cuttings weight. Additionally, a continuous damage model is constructed of the surrounding rock along the depth dimension, investigating how cuttings weight varies with drilling depth. Based on these findings, an automatic method is proposed for weighing cuttings to locate and estimate the magnitude of lateral stress peaks in roadway-surrounding rock. Field application experiments demonstrate the effectiveness of this method, yielding promising predictive results. The findings of this research provide both technical methods and theoretical support for using cuttings weight to quantitatively characterize coal body stress, which is crucial for accurately assessing coal body stress and for the early detection and warning of dynamic impact hazards.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"139 ","pages":"Article 103064"},"PeriodicalIF":3.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The impact of preschool children requiring adult assistance on evacuation efficiency","authors":"Hongliu Li ,&nbsp;Jacqueline Tsz Yin Lo ,&nbsp;Siuming Lo","doi":"10.1016/j.simpat.2024.103062","DOIUrl":"10.1016/j.simpat.2024.103062","url":null,"abstract":"<div><div>Preschool children, aged 3 to 6 years old, are a vulnerable group in emergencies due to their young age and limited self-protection abilities in kindergartens. Despite the critical role of kindergarten tutors in providing necessary aid and guidance, the adequacy of tutor-to-child ratios under increased assistance demands, and the efficacy of various evacuation guiding strategies, remain unexplored. This study modifies an agent-based model to simulate kindergarten evacuation, considering the proportion of children requiring assistance (ranging from 0 % to 100 %) and different guiding modes (instructing children in distinct regions: full circle, front semi-circle, and back semi-circle), with the aim of establishing ways to ensure effective evacuation. Through simulation, this study analyzes evacuation trajectories, evacuation time, flow, density distributions, and speed profiles to assess the impact of varying assistance needs and guiding strategies on evacuation efficiency. The findings reveal that an increase in the percentage of children needing assistance results in a gradual increase in evacuation time and a corresponding decrease in flow. Additionally, adopting the front semi-circle guiding mode speeds up evacuation compared to other guiding modes. These insights can provide valuable recommendations for kindergarten evacuation planning and crowd management for children.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"139 ","pages":"Article 103062"},"PeriodicalIF":3.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Bevel Local Slope Approach: A method for mesh stiffness estimation in spur, helical and spiral bevel gears","authors":"Ala Eddin Chakroun,&nbsp;Mattia Battarra,&nbsp;Emiliano Mucchi","doi":"10.1016/j.simpat.2024.103047","DOIUrl":"10.1016/j.simpat.2024.103047","url":null,"abstract":"<div><div>The local slope approach proved to be very useful in recent studies as a method to generate the gear mesh stiffness of spur gears. This study seeks to adopt this approach and apply it to the analysis of the gear mesh stiffness of bevel gears. The objective therefore extends beyond the validation of results obtained with an updated version of the method named the bevel local slope approach. This approach is considered as a finite element method that is based on a first-order finite difference approximation using the non-linear force–deflection response of the gear pair. CADs are prepared and optimum FE meshing is generated to realize simulations for several increments dividing a single meshing period. The results obtained with this approach are compared to the analytical approach of Weber and Banascheck. The goal is to illuminate potential challenges associated with the aforementioned method. A key observation is the phenomena occurring in the body of the gear as a torsional deformation at a direction different to the direction of rotation. The method proved to be very useful not only for straight bevel gears, but also for helical and spiral shapes.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"139 ","pages":"Article 103047"},"PeriodicalIF":3.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A discrete-event simheuristic for enhancing urban mobility","authors":"Mohammad Peyman ,&nbsp;Xabier A. Martin ,&nbsp;Javier Panadero ,&nbsp;Angel A. Juan","doi":"10.1016/j.simpat.2025.103084","DOIUrl":"10.1016/j.simpat.2025.103084","url":null,"abstract":"<div><div>This paper addresses a rich variant of the team orienteering problem under uncertainty to improve urban mobility. Specifically, we conduct a case study using real-world data from urban transportation hubs in Barcelona, gathered from Open Data Barcelona. The study involves routing autonomous delivery drones operating within a university campus to deliver items to designated drop-off points. Traditional optimization techniques often fail to account for the stochastic fluctuations inherent in urban traffic and the complex interactions between various transportation activities. To address these challenges, this research employs a simheuristic framework that combines heuristic optimization with commercial simulation software to replicate the dynamic and uncertain nature of urban environments accurately. The efficiency and practical applicability of our simheuristic framework are demonstrated through comprehensive computational experiments in a real-world context.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"140 ","pages":"Article 103084"},"PeriodicalIF":3.5,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation-based framework for authenticating SCADA systems and cyber threat security in edge-based autonomous environments","authors":"Ala Mughaid ,&nbsp;Shadi Alzu’bi ,&nbsp;Ahmad A.A. Alkhatib ,&nbsp;Adel AlZioud ,&nbsp;Alaa Al Ghazo ,&nbsp;Issa AL-Aiash","doi":"10.1016/j.simpat.2025.103078","DOIUrl":"10.1016/j.simpat.2025.103078","url":null,"abstract":"<div><div>Supervisory Control and Data Acquisition (SCADA) systems are pivotal to critical industries, such as oil and gas, water treatment, and power generation, where they enable real-time monitoring and control over complex industrial processes. These systems commonly use protocols like Modbus/RTU, Modbus TCP/IP, DNP3, and IEC60870, each chosen to meet specific operational requirements. However, vulnerabilities in protocols like Modbus TCP/IP, especially in access control, authentication, and data integrity leave SCADA networks susceptible to cyber threats, with risks ranging from process disruption to data breaches or potential physical harm to infrastructure. This study proposes a simulation-based security framework for SCADA environments using the Modbus TCP/IP protocol, incorporating authentication through unique identification bytes, robust encryption to secure communications, and a layered Intrusion Detection and Prevention System (IDS/IPS) to detect and counteract malicious activities. The framework’s effectiveness is demonstrated through simulated scenarios and a real-world case study, showcasing significant resilience against common cyber threats faced by SCADA systems.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"140 ","pages":"Article 103078"},"PeriodicalIF":3.5,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Scheduling bag-of-task jobs with security requirements and dual-criteria partial computations in a fog – cloud system","authors":"Helen D. Karatza","doi":"10.1016/j.simpat.2025.103082","DOIUrl":"10.1016/j.simpat.2025.103082","url":null,"abstract":"<div><div>Internet of Things (IoT) applications have become integral to daily life, but they often impose stringent security and timing constraints. Fog computing, a modern computing paradigm, extends the capabilities of cloud resources to the edge of the network, offering potential solutions to these challenges. In these collaborative computing environments, workloads are composed of tasks with varying security requirements. Consequently, implementing security-aware scheduling schemes is crucial to ensure the proper execution of applications and to achieve the desired Quality of Service (QoS). This study explores security-conscious scheduling methodologies specifically designed for Bag-of-Tasks (BoT) applications within a fog-cloud computing framework. Fog resources are suitable for processing BoT tasks with specific security requirements, referred to as “fog jobs”. Conversely, BoT applications without specific security requirements, referred to as “cloud jobs”, can be processed on either cloud or fog resources. To expedite the execution of fog jobs, a method that utilizes partial computations for cloud job tasks is employed. This study provides valuable insights into the effects of approximations on system performance through simulation-based evaluations. It considers partial computations based on delay levels in relation to service demands and the size of cloud jobs. This approach enhances system performance with only a minor trade-off in results accuracy.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"140 ","pages":"Article 103082"},"PeriodicalIF":3.5,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}