Expert Opinion Fusion Framework Using Subjective Logic for Fault Diagnosis

Peng Xu, Jin Hee Cho, Alejandro Salado

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Fault diagnosis plays a critical role in maintaining and troubleshooting engineered systems. Various diagnosis models, such as Bayesian networks (BNs), have been proposed to deal with this kind of problem in the past. However, the diagnosis results may not be reliable if second-order uncertainty is involved. This article proposes a hierarchical system diagnosis fusion framework that considers the uncertainty based on a belief model, called subjective logic (SL), which explicitly deals with uncertainty representing a lack of evidence. The proposed system diagnosis fusion framework consists of three steps: 1) individual subjective BNs (SBNs) are designed to represent the knowledge architectures of individual experts; 2) experts are clustered as expert groups according to their similarity; and 3) after inferring expert opinions from respective SBNs, the one opinion fusion method was used to combine all opinions to reach a consensus based on the aggregated opinion for system diagnosis. Via extensive simulation experiments, we show that the proposed fusion framework, consisting of two operators, outperforms the state-of-the-art fusion operator counterparts and has stable performance under various scenarios. Our proposed fusion framework is promising for advancing state-of-the-art fault diagnosis of complex engineered systems.

Original languageEnglish (US)
Pages (from-to)4300-4311
Number of pages12
JournalIEEE Transactions on Cybernetics
Issue number6
StatePublished - Jun 1 2022
Externally publishedYes


  • Expert clustering
  • fault diagnosis
  • opinion fusion
  • subjective Bayesian network (SBN)
  • subjective logic (SL)
  • uncertainty

ASJC Scopus subject areas

  • Software
  • Control and Systems Engineering
  • Information Systems
  • Human-Computer Interaction
  • Computer Science Applications
  • Electrical and Electronic Engineering


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