MINERVA superseeded IF/Prolog.
Please see
http://www.ifcomputer.co.jp/MINERVA
for details.
We discontinued to sell IF/Prolog Dec 31. 2003.
For current customers, we continue to provide
professional support for IF/Prolog until Dec 31, 2008.
Verein Deutscher Ingenieure of Germany evaluated diagnosis and maintenance
support for large steam turbines, one of the main elements in power plants.
The identification of causes of unbalance-excited vibrations in turbo-
machinery and their rapid removement are indispensable for the smooth
operation of power plants.
To machine-support this expert task InterFace Computer GmbH
in Germany has developed a diagnostic expert system for turbine vibra-
tions. When all necessary values such as rotation speed are entered,
the system starts inference during plant operation and shows possible
steps toward trouble correction. The system, for example, determines
whether a turbine blade is missing, or whether a bearing is defective.
Permanent monitoring allows the direct detection of problem sources.
Another advantage of early error identification is the prevention of
significant secondary damage.
The fault-cause relationships are represented by a set of constraints:
attributes of the turbine equipment (like speed of rotation) are inter-
connected through constraints. The evaluation mechanism can apply and
propagate a constraint "in any direction" on the related attributes,
depending on what data is given and what is searched for. The inference
mechanism employs a constraint propagation sytem, which is suitable for
diagnosis.
Hardware : UNIX Workstation with Graphics Terminal
Software : IF/PrologAOSF/Motif
 A screen picture of the system
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