Discrete event systems(DES)may lead to faults during operation,therefore, researching fault diagnosis is essential for systems stable operation. One of the research contents of DES fault diagnosis is verifying the diagnosability of systems, and its purpose is to determine whether faults can be detected within a finite observation sequence after their occurrence. Consequently, regarding this issue, we present a DES fault diagnosability verification approach based on a λ-free Petri net. Firstly, this paper makes a model of a λ-free Petri net, where the faults are represented as unobservable transitions. Next, we employ a particular net, called verifier net, which is built from the original Petri net and its fault-free subnet. Finally, we draw the reachability graph of the verifier net and propose a diagnosability verification method.- DOI:10.3969/j.issn.1000-1565.2025.06.003一种基于λ-free Petri网的离散事件系统可诊断性验证方法满育冰1,霍翊茗2,董亮3,冉宁1(1.河北大学 电子信息工程学院,河北 保定 071002; 2.河北大学 国际学院,河北 保定 071002;3.辽宁华电铁岭发电有限公司,辽宁 铁岭 112000)摘 要:离散事件系统(discrete event systems,DES)在运行中易发生故障,因此研究故障诊断方法对于保障系统安全稳定运行至关重要.系统可诊断性验证是DES故障诊断的研究内容之一,其目的是判断故障发生后能否在有限长度的观测序列内被检测出来. 因此,针对该问题,提出一种基于λ-free Petri网的DES可诊断性验证方法. 首先构建了λ-free Petri网模型,将故障建模为不可观变迁;其次基于原始模型和其无故障子网构建一个验证网;最后绘制验证网的可达性图,提出可诊断性验证方法.实验结果表明,该方法显著提升了DES故障可诊断性的验证能力,有效增强了DES在实际应用中的可靠性.关键词:Petri网;离散事件系统;可诊断性中图分类号:TP11 文献标志码:A 文章编号:1000-1565(2025)06-0582-08A verification method for the diagnosability of discrete event systems based on λ-free Petri netsMAN Yubing1, HUO Yiming2, DONG Liang3, RAN Ning1(1. College of Electronic Informational Engineering, Hebei University, Baoding 071002, China;2.International College, Hebei University, Baoding 071002,China;3. Liaoning Huadian Tieling Power Generation Co., Ltd., Tieling 112000,China)Abstract: Discrete event systems(DES)may lead to faults during operation,therefore, researching fault diagnosis is essential for systems stable operation. One of the research contents of DES fault diagnosis is verifying the diagnosability of systems, and its purpose is to determine whether faults can be detected within a finite observation sequence after their occurrence. Consequently, regarding this issue, we present a DES fault diagnosability verification approach based on a λ-free Petri net. Firstly, this paper makes a model of a λ-free Petri net, where the faults are represented as unobservable transitions. Next, we employ a particular net, called verifier net, which is built from the original Petri net and its fault-free subnet. Finally, we draw the reachability graph of the verifier net and propose a diagnosability verification method.- 收稿日期:2025-06-23;修回日期:2025-09-20 基金项目:国家自然科学基金项目(62373132);河北省自然科学基金项目(F2025201023);石家庄市驻冀高校基础研究项目(241791367A);河北大学优秀青年科研创新团队建设项目(QNTD202411);河北大学多学科交叉研究计划项目(DXK202409) 第一作者:满育冰(1999—),女,河北大学在读硕士研究生,主要从事离散事件系统方向研究.E-mail:15851890890@163.com 通信作者:冉宁(1987—),男,河北大学副教授,主要从事离散事件系统、人工智能方向研究.E-mail:ranning87@hotmail.com 第6期满育冰等:一种基于λ-free Petri网的离散事件系统可诊断性验证方法河北大学学报(自然科学版) 第45卷The results of experiments show that the proposed method significantly improves the verification capability of DES fault diagnosability and effectively enhanced the reliability of DES in practical applications.
MAN Yubing
,
HUO Yiming
,
DONG Liang
,
RAN Ning
. A verification method for the diagnosability of discrete event systems based on λ-free Petri nets[J]. Journal of Hebei University(Natural Science Edition), 2025
, 45(6)
: 582
-589
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DOI: 10.3969/j.issn.1000-1565.2025.06.003
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