A FUNCTIONAL-APPROACH FOR THE CONCURRENT DESIGN OF DIAGNOSTIC SYSTEMS

This paper presents an approach to develop a diagnostic model of a pro duct or process concurrently with the design stage. This approach is c onsistent with the principles of design. A functional hierarchy is use d to map the system requirements to physical parameters in the design stage to set up a complete and efficient model of diagnosis. The funct ionality of design is represented with a combination of a functional h ierarchy in the form of strata and graph-based methods, and the diagno sis at the level of physical artifacts is performed using failure prob abilities and hierarchical search. The failure probabilities are updat ed by a stochastic approximation method and can be acquired through le arning. Generic class diagnostic modules that allow the reuse of diagn ostic knowledge are also defined.