We describe the results of a cooperation between the Siemens Power
Generation Group and Siemens R&D to develop a program for detecting
H
2 leaks from the generator. This program is part of the
comprehensive DIGEST (Diagnostic Expert System for Turbomachinery)
analysis and diagnostics system for steam turbine generators in power
plants. This modular system comprises algorithmically
... [Show full abstract] oriented design
and analysis procedures with the knowledge based diagnostics modules
based chiefly on the experience accumulated by experts over many years.
The latter is characterized by an initially incomplete knowledge base
which is then expanded and stabilized by the experience gained in
operation. A further problem for this system is that this knowledge is
not formalized, but rather is available only as rules formulated in
natural language. This manner of expression, which is adequate for
experts, implies the imprecision and indistinctness inherent in natural
language. The complexity of the problem, the necessity for developing a
knowledge base step-by-step and the requirement to express imprecise
knowledge all lead to the decision to implement an expert system based
on fuzzy logic