Abstract
With the increasing importance of socio-technical systems, the analysis method of FRAM has attracted more and more attention due to the nonlinear accident causality and system adaptive characteristics. Aiming at the problem that the identification of functional variations in FRAM analysis method is not systematic enough, this paper proposes a method to systematically and comprehensively identify functional variations from three dimensions of human, machine and environment, and then gives the improved FRAM analysis process. Finally, a case study of the “Herald of Free Enterprise” accident is conducted to verify the applicability, correctness and effectiveness of the proposed method.
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