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Chapter 15. Fault Diagnosis of Large Man... > Recursive Network Modeling

Recursive Network Modeling

Small has introduced a modeling structure, System2, for constructing process models [7,8]. System2 is a recursive network model that separates the representation of process entities from the process principles that act on them. In System2, “a process is composed of a collection of subprocesses that interact as a result of their connectivity. Each subprocess is itself an individual process that can be completely defined separately from the definition of the process that contains it.” A process in System2 is defined recursively in a top-down fashion. The top-level consists of the highest possible abstraction of the process description in terms of process components and their connectivity. Subsequent layers contain the process descriptions of the underlying process components. Process definition continues until the desired level of detail has been achieved. The lowest levels will be process principles.

A process principle in System2 consists of a defined input-output relationship that is not dependent on any other process component. Process principles are the only process components that affect the quality variables. The higher levels simply declare how and when to apply the process principles. Process principles can be as detailed or as indefinite as needed and their level of detail can vary throughout the model. The designer is free to use whatever representation is convenient for the particular process component. A schematic of the recursive network model is given in figure 15-6. The vectors represent process entities and the square boxes represent process definitions.


  

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