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Language: search.filters.language.EnglishSubject: search.filters.subject.V-nets

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    Simultaneous occurrences and false-positives analysis in discrete event dynamic systems
    (Elsevier, 2020-07-01)
    Simultaneous occurrences of events have been a crucial and hard problem since the beginning of the research about automaton and simulation theories of discrete event systems, for more than 50 years. This article addresses some diagnosis problems in industrial processes, situations such as simultaneity of events, false positives, and partial recognition of event sequences. V-nets are presented as a means to model dynamic processes without the state machine concept and, the robustness and capability to identify different sequences of discrete events. With the V-nets formalism, it is possible to identify the evolution of the discrete events, simultaneous occurrences of events, partial recognition, counting the number of times that each discrete event occurred in a temporal sequence and this formalism also has the capability to model sequences of sequences. An example of one industrial application is presented and a comparative analysis of the Time Petri Nets, Timed Automata, and Chronicles with the V-nets is exposed.
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    Enhancing alarm management in green hydrogen plants: A comprehensive analysis of the V-NETS-based methodology
    (Ecopetrol S.A., 2024-12-01)
    This paper presents a novel V-nets-Based Alarm Management (VBAM) methodology designed to enhance supervision and safety in Green Hydrogen Plants (GHPs). The proposed approach integrates visual modeling and temporal pattern analysis to accurately detect and manage alarms, seeking to reduce false positives and optimize response times. The methodology starts with a Preliminary Hazard and Operability (HAZOP) analysis to identify potential hazards and critical operational conditions, which are the foundation for constructing V-nets that map the temporal relationships between discrete events. By systematically capturing event sequences and their interdependencies, the VBAM approach allows for early fault detection and a proactive alarm management system fit for varying operational scenarios. A case study of the EL30N Green Hydrogen Plant proves the efficacy of the VBAM methodology in reducing downtime, improving system safety, and enhancing overall operational efficiency. This work provides a comprehensive framework for addressing discrete event challenges in alarm management, paving the way for safer and more resilient practices in green hydrogen production. Future directions will include expanding the application of VBAM to other operational phases and incorporating real-time analytics for further performance optimization.
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    Enhancing Safety in Lithium Mines: Super Alarm Generation Using V-Nets for Autonomous Vehicles
    (Elsevier BV, 2025-10-01)
    The deployment of autonomous vehicles in lithium mining operations faces significant safety challenges due to the complexity and unpredictability of mining environments. Reliable hazard detection and response are critical to preventing accidents and operational disruptions. Super alarms, an advanced alarm management strategy, have shown promise in identifying critical event patterns. However, conventional methods are limited by high false alarm rates and poor adaptability in dynamic, real-time systems. This study proposes using V-nets, a formalism for managing discrete event sequences, as a novel approach to generating and simulating super alarms for autonomous vehicles in lithium mines. V-nets structure event sequences to enhance the accuracy and adaptability of super alarm systems, addressing the limitations of traditional rule-based or statistical models. The proposed approach enables a context-aware and predictive alarm mechanism, reducing false alarms while improving the detection of hazardous situations. A simulation framework models autonomous vehicle trajectories in a mining environment, integrating V-net-based super alarm generation. Performance is evaluated using key metrics such as detection accuracy, response time, and false alarm rates. Results demonstrate that V-nets significantly improve alarm precision, reducing unnecessary alerts by 77% while achieving 96.3% accuracy in detecting critical safety events. These findings highlight the potential of V-nets in advancing alarm management for industrial automation, offering a scalable and intelligent solution for safety-critical mining applications. This research provides a foundation for future implementations of V-nets in real-world autonomous mining operations, contributing to improved risk management, operational efficiency, and safety in the rapidly evolving mining industry.
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