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Test signal generation for service diagnosis based on local structural properties

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Ungermann M., Lunze J., Schwarzmann D.
International Journal of Applied Mathematics and Computer Science
|
2012
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tom 22
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nr 1
55-65
EN
The paper presents a new approach to the generation of test signals used in service diagnosis. The tests make it possible to isolate faults, which are isolable only if the system is brought into specific operating points. The basis for the test signal selection is a structure graph that represents the couplings among the external and internal signals of the system and the fault signals. Graph-theoretic methods are used to identify edges that disappear under certain operating conditions and prevent a fault from changing the system behavior at this operating point. These operating conditions are identified by validuals, which are indicators obtained during the graph-theoretic analysis. The test generation method is illustrated by a process engineering example.
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Fault diagnosis of a water for injection system using enhanced structural isolation

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Laursen M., Blanke M., Düştegör D.
International Journal of Applied Mathematics and Computer Science
|
2008
|
tom 18
|
nr 4
593-603
EN
A water for injection system supplies chilled sterile water as a solvent for pharmaceutical products. There are ultimate requirements for the quality of the sterile water, and the consequence of a fault in temperature or in flow control within the process may cause a loss of one or more batches of the production. Early diagnosis of faults is hence of considerable interest for this process. This study investigates the properties of multiple matchings with respect to isolability, and it suggests to explore the topologies of multiple use-modes for the process and to employ active techniques for fault isolation to enhance structural isolability of faults. The suggested methods are validated on a high-fidelity simulation of the process.
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