Simulation Modelling Practice and Theory最新文献

{"title":"On the modeling of dynamic queue formation and decision-making in pedestrian dynamics simulations","authors":"Ander García ,&nbsp;Dariel Hernández-Delfin ,&nbsp;Dae-Jin Lee ,&nbsp;Marco Ellero","doi":"10.1016/j.simpat.2025.103130","DOIUrl":"10.1016/j.simpat.2025.103130","url":null,"abstract":"<div><div>This work presents two distinct and novel approaches to simulating dynamic queue formation and route decision-making in pedestrian systems. Queue formation is modeled by detecting pedestrians within a specific cutoff distance from others already in line, altering movement forces and leading to organized queuing behavior. Two distinct methodologies are introduced to simulate dense, compressed formations and elongated, thin lines. A parametric analysis assesses how queue dimensions depend on model parameters. Additionally, we introduce a simple criterion for route selection based on the identification of queuing agents, prioritizing the most time-efficient route while accounting for delays caused by queues. Dynamic route changes are modeled by shifting between multiple pre-calculated velocity maps for each potential exit. Finally, both queuing and decision-making approaches are combined to study how queues affect route choice. Our results predict that pedestrian decision is influenced by the type of queue forming before the gates.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"142 ","pages":"Article 103130"},"PeriodicalIF":3.5,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083693","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":"MASS-GT: An empirical model for the simulation of freight policies","authors":"Michiel de Bok ,&nbsp;Lóránt Tavasszy ,&nbsp;Sebastiaan Thoen ,&nbsp;Larissa Eggers ,&nbsp;Ioanna Kourounioti","doi":"10.1016/j.simpat.2025.103140","DOIUrl":"10.1016/j.simpat.2025.103140","url":null,"abstract":"<div><div>Despite the importance of urban freight transportation for the accessibility and livability of cities, few systematic, quantitative and empirical methods exist which allow an impact assessment of urban freight transportation solutions or policies. There is a lack of transparent literature on the full specification and estimation of these models, which not only hampers continued research, but also the development of evidence-based urban freight transport policies. We present the urban freight simulator Multi-Agent Simulation System for Goods Transport (MASS-GT) with its full specification and empirical implementation for a study area in The Netherlands. It concerns an agent-based model based on a framework of discrete choice and optimization models, which describes logistic choices of shippers, carriers, producers and consumers. The disaggregate level of detail allows the analysis of a wide variety of logistic developments and policies across all or specific logistic segments. The model is estimated and validated using a variety of data sources: truck trip diaries, supply/use statistics, an e-commerce demand survey, traffic counts and other relevant statistics. The article presents the full specifications of the model and their empirical estimation, including the data sources used. Also, the validity of the model is evaluated using road freight traffic counts. Finally, examples of applications of the model to case studies are provided.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"142 ","pages":"Article 103140"},"PeriodicalIF":3.5,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144071579","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":"Impact of electro-magnets on enhanced hall-effect amplifier nanoscale device (HAND) – part 1: Modelling & simulations","authors":"Raz Mottes ,&nbsp;Avi Karsenty","doi":"10.1016/j.simpat.2025.103133","DOIUrl":"10.1016/j.simpat.2025.103133","url":null,"abstract":"<div><div>A new version of a nanoscale device, based on the famous Hall Effect, and named HAND (Hall Amplifier Nanoscale Device), was designed and analytically modelled, with the goal of implementing the macro-Hall effect on the nano scale. Following the physics of the Hall effect, the device receives a current as an input and creates a voltage as an output, which means it possesses a low input impedance and a high output impedance. While most other nanoscale devices based on the Hall effect are sensors, HAND operates as both an amplifier and a modulator, and it can be expected to find use in electronic circuits at very high frequencies (tens of THz). The first generation of the device required several improvements in advance of future fabrication of the second generation. One of these was enabling an increase of the applied magnetic field to higher values while preventing undesirable overheating of the device. Several approaches were taken toward this end, including changes to the material composition, device geometry, and other physical parameters of the HAND. A renewed mathematical description of the device behavior in DC condition was developed, as well as thorough analytical models for classical Hall Effect, in order to accurate forecast the behavior of the re-designed HAND. The analytical and numerical simulation results matched fully, validating the mathematical model for the case of a spiral coil geometry. This improved device, combining high frequency operation, amplification, the Hall effect, and nanoscale dimensions, is capable of revolutionizing microelectronic circuitry.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"142 ","pages":"Article 103133"},"PeriodicalIF":3.5,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143927584","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 step-path failure mechanisms in rock slopes with en-echelon joints based on FDEM simulation","authors":"Haoyu Han ,&nbsp;Xuantao Liu ,&nbsp;Hongyuan Liu ,&nbsp;Daisuke Fukuda ,&nbsp;Lingyu Zeng ,&nbsp;Zicheng Xiong ,&nbsp;Yuxing Wang ,&nbsp;Yangtian Ye ,&nbsp;Andrew Chan","doi":"10.1016/j.simpat.2025.103138","DOIUrl":"10.1016/j.simpat.2025.103138","url":null,"abstract":"<div><div>In this study, an in-house combined finite-discrete element method (FDEM) is implemented to simulate and analyze the entire step-path failure process in rock slopes with en-echelon joints under natural conditions. Based on the Longmenqiao Reservoir slope in Chongqing, China, numerical models of the slope with and without en-echelon joints are established, and a comparative analysis is first conducted to explore the effects of the en-echelon joints on the slope failure mode. Then, to further investigate the slope failure mechanisms due to various influencing factors on site, a series of parametric analyses is conducted following an orthogonal experimental design with six factors at three levels. Through range and variance analyses of the computation results from 18 numerical models, the sensitivities of the slope stability to slope angle, slope height, joint angle, joint length, rock bridge angle, and rock bridge length are evaluated. Furthermore, a single-variable analysis method is adopted to build 24 numerical models with a focus on the aforementioned six key influencing factors to investigate the specific impacts of each factor on the slope stability, slope failure mode, and kinetic energy variation during the slope failure process. It is found that the fracture of the slopes with the en-echelon joints emerges sequentially along the joints and rock bridges from the bottom to top during the small deformation stage and reversals in shear stress direction are observed within the rock bridges during the detachment stage. The slope stability is found to be sensitive to the following six key influencing factors in descending order: joint angle, slope angle, slope height, joint length, rock bridge angle, and rock bridge length. A negative correlation is identified between the slope stability and the slope angle, slope height as well as joint angle while no clear linear relationship exists with the other three parameters. The numerical findings not only deepen the understanding of the mechanisms of step-path failure in rock slopes but also provide solid theoretical and data foundations for landslide risk assessment and prediction under complex environmental conditions.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"142 ","pages":"Article 103138"},"PeriodicalIF":3.5,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947985","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":"Development and evaluation of digital twin model for rack and pinion drive vegetable seedling transmission device using Adams/MATLAB co-simulation","authors":"Ibrar Ahmad ,&nbsp;Bushra Siddique ,&nbsp;Muhammad Adnan Islam ,&nbsp;Zia Ul Haq ,&nbsp;Ziang Niu ,&nbsp;Muhammad Mohsin Waqas ,&nbsp;Qizhi Yang ,&nbsp;Zhengjun Qiu","doi":"10.1016/j.simpat.2025.103132","DOIUrl":"10.1016/j.simpat.2025.103132","url":null,"abstract":"<div><div>A sustainable design and optimized control system for the vegetable seedling transmission device is crucial for enhancing the operational speed and precision of fully automatic vegetable seedling transplanters. The incorporation of virtual prototype modeling for optimizing the design and control of these seedling devices has not been sufficiently explored in prior studies. Goal of this research is to develop and validate a digital twin model that will serve as a foundation for optimizing the design and control of seedling devices used in robotic transplanters. This study presents a state-of-the-art digital twin model of rack and pinion drive seedling transmission device utilizing Adams/MATLAB co-simulation. The findings demonstrate a robust correspondence between digital twin model and physical prototype, exhibiting a maximum linear positioning error discrepancy of 0.95 mm, a maximum relative positioning error of 3.17 and coefficient of determination (<span><math><msup><mrow><mi>R</mi></mrow><mn>2</mn></msup></math></span>) values approximately equal to 1. Angular positioning error ranged from 3.73° to 7.98° as seedling rates increased from 90 to 140 seedlings/mi. Furthermore, precise activation and deactivation of the seedling cups opening mechanism was observed during the seedling transmission schedule. This digital twin model accurately represents the physical model of seedling device which can be utilized for design and control optimization. Potential future applications of this digital twin model include enhancing efficiency of robotic transplanters and mitigating environmental impacts.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"142 ","pages":"Article 103132"},"PeriodicalIF":3.5,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144068119","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":"Study crowd following behaviors with dynamic groups","authors":"Bin Yu","doi":"10.1016/j.simpat.2025.103129","DOIUrl":"10.1016/j.simpat.2025.103129","url":null,"abstract":"<div><div>To use the concept of dynamic group to study crowd following behaviors, group related rules considering pedestrians’ movement characteristics under relevant configurations are proposed. A hierarchy of individual and subordinate leader–follower groups is devised. The hierarchy is allowed to alter in the run-time so that groups can be dynamically added or removed. Through this method, crowd following behaviors can be modeled with the concept of group in simulations. Data structures and algorithms are designed in order to implement the proposed method into a GPU-based heterogeneous computing platform. Numerical experiments demonstrate the model’s capability to capture phenomena such as self-organization of pedestrian lanes. By calibrating density-dependent parameters, the simulated speed-density relationship shows consistency with the Weidmann fundamental diagram under conditions dominated by dynamic following behaviors. Since such dynamic behaviors are key factors in crowd flows, this work suggests that dynamic group modeling can provide new insights for transportation researchers studying collective dynamics.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"142 ","pages":"Article 103129"},"PeriodicalIF":3.5,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143934911","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":"Comparing blockchain and DAG technologies for smart agriculture traceability in terms of efficiency and latency","authors":"Antonio Villafranca ,&nbsp;Igor Tasic ,&nbsp;Victor Gallegos ,&nbsp;Almudena Gimenez ,&nbsp;Jesus Ochoa Rego ,&nbsp;Juan Antonio Fernandez ,&nbsp;Maria-Dolores Cano","doi":"10.1016/j.simpat.2025.103131","DOIUrl":"10.1016/j.simpat.2025.103131","url":null,"abstract":"<div><div>Distributed Ledger Technologies (DLT), such as Bitcoin, Ethereum, and Directed Acyclic Graphs (DAG), are being positioned as a promising solution for smart agriculture by enabling secure, decentralized, and transparent traceability systems. However, these technologies face challenges related to scalability, latency, and efficiency in IoT environments. In this study, we conduct a comparative analysis of Bitcoin, Ethereum, and DAG technologies through extensive simulations, varying transaction generation rates and network latencies. A key methodological innovation of this research is the detailed codification of agricultural data transactions, encompassing parameters such as crop type, fertilization, harvesting, and transportation, enabling a structured and scalable approach to data representation. Our results reveal that Bitcoin's robustness is hindered by its high sensitivity to latency and network load, with inclusion times exceeding 700 s. Ethereum demonstrates better adaptability, with controlled inclusion times ranging from 12.91 to 35.76 s under varying conditions. DAG outperforms both, achieving significantly lower inclusion times between 4.27 and 22.25 s, highlighting its suitability for real-time applications. To the best of our knowledge, this is the first study to provide a direct comparison of these technologies in the context of agricultural traceability, showcasing the advantages and limitations of DAG-based systems for managing and scaling agricultural IoT networks.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"142 ","pages":"Article 103131"},"PeriodicalIF":3.5,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903627","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":"Reduction of core size and power losses of a soft composite magnetic gear","authors":"Taner Dindar ,&nbsp;Kadir Yilmaz","doi":"10.1016/j.simpat.2025.103135","DOIUrl":"10.1016/j.simpat.2025.103135","url":null,"abstract":"<div><div>This study aims to achieve low-volume torque transmission with high efficiency by using a coaxial magnetic gear in vehicle powertrain systems. In this study, the magnetic properties of non-oriented electrical steel (M400–50A), cobalt alloy steel (Vacodur 50), and soft magnetic composite (Somoloy 700HR 5P) materials containing isolated iron particles are examined in detail. For the coaxial magnetic gear with a high-speed side of 6000 rpm, a low-speed side of 1800 rpm, and a 3.33:1 gear ratio, a magnetic comparison of the materials at low and high frequencies is presented. Power losses, volumetric torque density, and efficiency analyses for magnetic gears of the same size were performed using Ansys Maxwell 2D finite element software. The numerical analyses revealed that the Vacodur 50 provided superior performance compared to the other materials. It was found that without changing the magnet volume, the magnetic gear dimensions could be improved by approximately 2.67 % compared to M400–50A and by approximately 4.17 % compared to Somoloy 700HR 5P, while maintaining the same efficiency values. In conclusion, the use of Vacodur 50 in magnetic gears allows for more compact designs in vehicle powertrain systems than other materials.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"142 ","pages":"Article 103135"},"PeriodicalIF":3.5,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912281","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":"Balancing of slider-crank and Scotch-yoke mechanisms by the use of mechanical resonance: Simulation and experiment","authors":"Willy Prastiyo,&nbsp;Wiesław Fiebig","doi":"10.1016/j.simpat.2025.103137","DOIUrl":"10.1016/j.simpat.2025.103137","url":null,"abstract":"<div><div>Unbalanced inertia forces, moments, and torques in slider-crank and Scotch-yoke mechanisms adversely affect performance, leading to vibrations, stress, and accelerated wear. This paper presents the application of mechanical resonance as a solution to mitigate these drawbacks. The modeling and investigations involve multibody simulations incorporating both rigid and flexible bodies, alongside experimental tests in various scenarios. The synthesis section covers the explanation of techniques for generating resonance, achieving optimal reciprocating body positioning, and gravity compensation. The analysis and comparison section examines and contrasts the input torque, reaction forces on the joints, shaking forces, shaking moments, and stresses in the bodies between the conventional and resonance setups. The findings indicate significantly improved dynamics under resonance conditions for both mechanisms. In the absence of non-conservative forces, the slider-crank mechanism experiences a reduction of up to 79.99 % for peak joint reaction force, 76.74 % for the RMS value, 81.6 % for peak inertia torque, and 82.2 % for RMS torque. Resonance in the Scotch-yoke mechanism entirely reduces torque fluctuation due to the harmonic nature of slider motion, thus practically eliminating reaction forces at main kinematic pairs.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"142 ","pages":"Article 103137"},"PeriodicalIF":3.5,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143934910","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":"A modular configuration-based rapid verification and validation framework combining analytical and simulation methods for intelligent manufacturing systems","authors":"Shulian Xie,&nbsp;Weimin Zhang,&nbsp;Mulin Shen,&nbsp;Feng Xue","doi":"10.1016/j.simpat.2025.103136","DOIUrl":"10.1016/j.simpat.2025.103136","url":null,"abstract":"<div><div>Verification and Validation (V&amp;V) are crucial steps in the design to operation process of manufacturing systems to ensure the accuracy, safety, and reliability. The development of intelligent manufacturing technology and the acceleration of market changes are driving the increase of complexity and flexibility of manufacturing systems and the shortening of development cycles. These enhance the comprehensiveness, efficiency, and automation requirements of V&amp;V. However, existing V&amp;V schemes and cases cannot fully utilize the complementary advantages of analytical and simulation methods. It is difficult to meet the effective V&amp;V requirements of complex intelligent manufacturing systems. This study proposes a modular configuration-based manufacturing system V&amp;V framework combining analytical and simulation methods for rapid V&amp;V of manufacturing systems. The construction method of modular configurations of manufacturing systems is explored. The modular configuration has been divided into the component function, system logic, and joint model sub-configurations and modularly packaged and integrated based on Asset Administration Shells (AAS). A rapid V&amp;V process for manufacturing systems has been established. This process employs a test-module-driven approach to achieve configuration-based V&amp;V testing of manufacturing systems. It supports synchronized co-simulation with equipment, software, and models in the loop. Finally, a simple manufacturing system V&amp;V case was provided as an implementation reference. The proposed framework can demonstrate the rapid V&amp;V of intelligent manufacturing systems and contribute to the development of automated V&amp;V tools.</div></div>","PeriodicalId":49518,"journal":{"name":"Simulation Modelling Practice and Theory","volume":"142 ","pages":"Article 103136"},"PeriodicalIF":3.5,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143907762","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}