Diagnosers for discrete event systems: improved realization and examples

Download

index.pdf

Date

2014

Author

Kart, Bora Eser

Metadata

Show full item record

Item Usage Stats

148
views

96
downloads

Many complex systems in different areas such as manufacturing, telecommunications or transportation can be modeled as Discrete Event Systems (DES). The task of fault detection and isolation is naturally desired for every system that has the possibility of any fault occurrences in it. To this end, a DES machine that can detect every modeled fault after a bounded number of event occurrence called diagnoser is used. In this thesis, there are two diagnoser realizations corresponding to the notions of event and language diagnosability. The proposed diagnosers function as centralized diagnosers that run parallel to the given systems and perform online diagnosis. Differing from similar studies, we denote our diagnosers as improved diagnosers because they explicitly give a notiﬁcation as soon as a faulty behavior is detected. This makes our diagnosers more useful in practice. In addition, our study simpliﬁes the computation of the worst-case delay until a fault is detected. Moreover, we further enhance our improved diagnoser by applying an algorithm to remove unnecessary observations. As a result, fewer sensors are needed and the constructed diagnosers have a smaller size. The merits of the proposed diagnoser approach and the applicability of our algorithmic implementation are demonstrated by a communication network system example.

Subject Keywords

Discrete-time systems., System analysis., Large scale systems., Systems engineering., System failures (Engineering)., Failure analysis (Engineering).

URI

http://etd.lib.metu.edu.tr/upload/12617037/index.pdf
https://hdl.handle.net/11511/23441

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Combined centralized and decentralized fault diagnosis for discrete event systems Karav, Ruhi; Schmidt, Şenan Ece; Schmidt, Klaus Werner; Department of Electrical and Electronics Engineering (2014) Discrete Event Systems (DES) are used for modeling systems such as manufacturing systems, telecommunication systems and transportation systems. It is possible to incorporate the fault model in the DES model together with a fault diagnosis approach to evaluate the robustness and the reliability of the system at the design stage. There are centralized or decentralized fault diagnosis approaches in the literature. The centralized fault diagnosis achieves stronger results however it does not scale to reasonably...
Forecasting of Product Quality Through Anomaly Detection Dinç, Mehmet; Ertekin Bolelli, Şeyda; Özkan, Hadi; Meydanlı, Can; Atalay, Mehmet Volkan (2020) Forecasting of product quality by means of anomaly detection is crucial in real-world applications such as manufacturing systems. In manufacturing systems, the quality is assured through tests performed on sample units randomly chosen from a batch of manufactured units. One of the major issues is to detect defective units among the sample test units as early as possible in terms of test time and of course as accurate as possible. Traditional way of detecting defective units is to make use of human experts d...
Order-Preserving Languages for the Supervisory Control of Automated Manufacturing Systems Nooruldeen, Anas; Schmidt, Klaus Verner (Institute of Electrical and Electronics Engineers (IEEE), 2020-01-01) Automated manufacturing systems (AMSs) consist of computer-controlled interconnected manufacturing components (MCs) that are used to transport and process different product types. Each product type requires a certain sequence of processing steps in different MCs. Hereby, multiple product types can share processing steps on the same MC and the paths of different products types can overlap. In this paper we consider the modeling of AMSs in the scope of supervisory control for discrete event systems (DES). On ...
Approaches to Modelling and Analysis of Performability Evaluation in Wireless Environments Ever, Yoney Kirsal; Kirsal, Yonal; Ever, Enver (2015-05-19) Most wireless communication and mobile computing systems are expected to be operational 24 hours a day, 7 days a week. However, wireless communication systems encounter failures. Performability modelling and evaluation of wireless and mobile systems have been of interest for recent research work. Especially, because of the complexity of the next generation wireless and mobile systems, modelling and performance evaluation is essential to improve the architecture according to the quality of service (QoS) requ...
Real-time hardware-in-the-loop simulation of electrical machine systems using FPGAs Üşenme, Serdar; Dilan, R.A.; Dölen, Melik; Koku, Ahmet Buğra (2009-11-18) This study focuses on the development an integrated software and hardware platform that is capable of performing real-time simulation of dynamic systems, including electrical machinery, for the purpose of hardware-in-the-loop simulation (HILS). The system to be controlled is first defined using a block diagram editor. The defined model is then compiled and downloaded onto an FPGA (¿Field Programmable Gate Array¿) based hardware platform, which is to interface with the controller under test and carry out the...

Citation Formats

B. E. Kart, “Diagnosers for discrete event systems: improved realization and examples,” M.S. - Master of Science, Middle East Technical University, 2014.