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Discrete event simulation tool for analysis of qualitative models of continuous processing system

  • US 4,965,743 A
  • Filed: 07/14/1988
  • Issued: 10/23/1990
  • Est. Priority Date: 07/14/1988
  • Status: Expired due to Term
First Claim
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1. A method for off-line experiments and analyses of an application specific system of components using qualitative modeling and discrete event simulation to analyze dynamic system effects of changes in components with continuous behavior, including malfunction, comprising the steps of:

  • providing a library knowledge base of domain specific modeling elements which includes components with modes, mode transition, variables, and behavior descriptions, a qualitative algebra for defining and combining component variables, and relations to link the components, constructed relative to the application specific system,providing a model knowledge base for the application specific system, which includes component instances, each with a current mode, linked by relation instances,providing change control mechanisms, independent and distinct from the domain specific modeling elements, to select and control effects of changes within the model knowledge base, to control a time-ordered simulation,inputting data, which may include malfunction data, to effect changes in the component instances within the model knowledge base, either by changing a variable value of a component instance or by changing the current mode of a component instance,updating variable values and the current mode of component instances, and propagating changes through the model knowledge base in a time-ordered fashion in response to the input data and resulting changes, under control of the change control mechanisms,and outputting information in response to the changes in variable values and the current mode of component instances and to the propagation of changes through the model knowledge base, to support analysis of effects of changes which may include malfunctions, on modes of component instances, and to support analysis of diagnostic experiments in which effects of malfunctions on the system are compared.

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