Abstract
In the early stage of PHM system design, it is very important to analyse the failure modes and their effects,i.e. FMEA. A great number of model-based methods have been proposed recently; however, the analysis process might concern only qualitative or quantitative demands for the complex system. The method is usually difficult to adapt to the progressively definite research for modular modelling of the functional structure. It is necessary to provide an adaptive approach to represent the relationship between the functions and the faults, covering the period from initial planning to final performance assessment. This paper explores the challenges and needs of efforts to implement FMEA, laying an emphasis on functional modelling. In particular, this paper puts forward a qualitative and quantitative hybrid modelling method based on the bond graph theory framework, together with embedded block diagram modules and programming conditional statements. Afterwards, the presented method is exemplified with an EHA (electro-hydrostatic actuator) system, and the simulation results demonstrate the efficiency.
