Abstract
This paper addresses the functional representation based on the event model. In the event model, the ontology is defined based on the theory of propositional logic to describe the connotation of the event, and the variant is defined based on the theories of domain relational calculus and set theory to express the variation range of the event, which is alterable part of the event under the constraints of the ontology. Function is an important concept in conceptual design and has its connotation and extension. The functional representation is proposed based on the event model. The ontology of event is used to describe the connotation of function and to reflect the stability of function. The variant of the event is used to represent the extension and to incarnate the variety of function. The extension of function is the change range of function under the constraints of the connotation. The proposed functional representation divides the function into the immutable part and the alterable part, facilitating the expansion of design space. A functional reasoning model is also put forward based on the event model to support the function reasoning on the computers. Finally, a simple case validates the feasibility of the model.
Highlights
Suppose Q is the ontology of event E, and V is the variant of event E
Suppose Q is the ontology of event E, and Q can be decomposed as Q ↔ QR ∧ QS ∧ dRiθdSj, where QR and QS are two independent sets of propositions and dRiθdSj is the proposition that describes the relationship between the common attribute variables of the decomposed sub-events
The functional representation based on the event model divides the function into the immutable connotation and alterable extension, and the extension is the alterable part of the function under the constraints of the connotation
Summary
This paper addresses the functional representation based on the event model. The ontology is defined based on the theory of propositional logic to describe the connotation of the event, and the variant is defined based on the theories of domain relational calculus and set theory to express the variation range of the event, which is alterable part of the event under the constraints of the ontology. Function is an important concept in conceptual design and has its connotation and extension. The functional representation is proposed based on the event model. The extension of function is the change range of function under the constraints of the connotation. The proposed functional representation divides the function into the immutable part and the alterable part, facilitating the expansion of design space.
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