A comparison of fault trees and the Dynamic Flowgraph Methodology for the analysis of FPGA-based safety systems part 2: Theoretical investigations

Dynamic fault tree (DFT) is an extended technology of Fault tree analysis (FTA). It has been widely used in many fields and plays an important role in improving the security performance of the system. Although DFT has developed for many years, new research in recent years is still worthy of attention. In this study, the research status of different realization methods/analysis techniques of DFT is comprehensively reviewed. First, the development and research trend of DFT are described. Second, the research on dynamic gates and components in the analysis techniques is introduced in detail. Third, the mainstream realization methods of DFT, such as Markov chain, Bayesian network (BN) and so on, are summarized. At the same time, the application of other auxiliary analysis techniques is also introduced. Then, based on the research progress of different realization methods, the future development direction and challenges of DFT are prospected. The realization methods of DFT not only need the rigorous theoretical foundation. Moreover, it is also necessary to consider the combination of real‐time data and system modeling technology to realize dynamic assessment and smart system in the future.

Section: The Realization Methods Of Dftmentioning

confidence: 99%

Section: The Realization Methods Of Dftmentioning

confidence: 99%

A review on the realization methods of dynamic fault tree

Zhu

Zhang

2022

“…14,15 A DFM based temporal approach to estimate the probability of failure of a digital system was performed. 16 It demonstrated the capability of DFM in handling of the multi valued logic and inclusion of the sink states and dynamic consistency rules in the analysis. The suitable techniques identified for this study and their respective attributes are shown in Table 1.…”

Section: Introductionmentioning

confidence: 93%

“…6,7,16,18 A comparison between Fault Trees and DFM approach in modelling the time dependent behaviour of multi-valued logic systems was previously performed in the literature. 16 DFM was applied to a Water Level Measurement (WLM) system wherein it was modelled as a dynamic system as shown in Figure 4. WLM at the current time step is a function of its value at the previous time step, as well as the value of the "Water Level" (WL) and "Measurement Failure" (MF) inputs.…”

Section: Node Statesmentioning

confidence: 99%

See 1 more Smart Citation

Hybrid DFM – Petri net approach for dynamic reliability analysis of smart transmitters

Garg

Vinod

Prasad

et al. 2023

Smart transmitters are increasingly being deployed in safety critical systems. Although the processing and diagnostic features provided by digital systems are advantageous, it introduces additional complexity in reliability modelling of systems. The conventional Fault Tree Analysis (FTA) method for system reliability analysis has its shortcomings in modelling digital systems, to incorporate its dynamic system interaction and failure modes in detail. This is because some of the failure modes may arise due to the dynamic interactions between the modules of the system. Dynamic Flowgraph Methodology (DFM) was identified as one of the optimistic approaches to handle these interactions. DFM approach combines multi‐valued logic modelling and analysis capabilities to handle systems consisting of components that have multiple degraded states and exhibit dynamic behaviour. However, only few DFM tools have been developed and some of them are not available in public domain. The DFM approach relies heavily on development and implementation of its decision tables. The logic information present within the decision tables can be meticulously implemented using Petri Nets. Also, there are plenty of free Petri Nets tools available online. Thus, the idea of DFM was used in this work to capture the dynamic interactions by developing decision tables. The decision tables were transformed into the Petri Net models to perform the analysis. The paper demonstrates the potential of the hybrid DFM – Petri Net approach for dynamic reliability analysis of smart transmitter.

Integration frameworks and intelligent research in dynamic fault tree: A comprehensive review and future perspectives

Zhu

Jiang

et al. 2023

Dynamic fault tree (DFT) is designed to conduct risk assessment studies of complex systems. With the development of intelligent and network technology, risk assessment technology faces a leap forward development. The requirements for improving system safety are being recognized. On the one hand, research on DFT is exploring the integration with different methods. On the other hand, DFT method becomes more intelligent. The purpose of this paper is to identify the feasibility and effectiveness of different integration frameworks. To achieve this goal, a suitable review process is proposed. This paper comprehensively reviews and proposes future perspective the research status of intellectualization in DFT, and focuses on the different types of integration framework of DFT, modeling technology and algorithm optimization, and the support of computer‐aided analysis. Theoretical contributions, frameworks features, and the development process of computer intelligent analysis in the scientific and technical literature are carefully reviewed. Finally, the challenges in future research are summarized to promote the development of intelligent evaluation.