This paper introduces an approach to a port-based functional modeling framework for product conceptual design. A port-based knowledge building process is described for functional modeling. This research proposes a method of creating and managing different ports. First, this paper describes port attributes and three port types -mechanical port, electrical port and configuration port, and gives port attributes of compatibility. Second, it presents a port-based modeling design process, that is divided into three main modules: the language of port description, port-based FBS representation and port knowledge management. Three knowledge layers are specialized for function, behavior and structural knowledge. They represent different abstraction levels of the product conceptualization. Each layer is represented with a description logic for convenient reasoning. We provide formal definitions of the framework to manage port knowledge. Finally, the process of port-based functional modeling is presented in a thermal bubble jet application to demonstrate the effectiveness of the research.
Configuration design lies in the later stage of the conceptual design. It affects the downstream of design process and decides product structure. Therefore, it is necessary to pursue an approach to support such design stage activities. Port, as the location of intended interaction, plays an important role in the configuration design, which abstractly represents the intended exchange of signals, energy or material in a convenient way. Ontology is an unambiguous and flexible semantic specification corresponding entities, and it can effectively describe the function of port. In this paper, we firstly give port concept and port functional description, and their semantic synthesis is used to describe port ontology. Second, we build an ontology repository which contains the assorted primitive concepts and primitive knowledge to map the component connections and interactions. Meanwhile we provide a model of port-based multi-views which contains functional view, behavior view and configuration view, and gives the attributes and taxonomy of ports. Next, a port-based ontology language (PBOL) is described to represent the process of port ontology refinement, and a port-based FBS modeling framework is presented to describe system configuration. Finally, a revised tape case is given to show the application of the port-based ontology.
Micro-pump is a fundamental component of micro-fluid machine, which has obtained an extensive use in medical care, bio-engineering, and the other fields. Its application will continuously be expanded. Its structure is different from the conventional mechanical pump as its size and flow limit, thus it is difficult to directly apply traditional method to micro-pump modeling. Firstly, the paper introduces the structure of the cantilever piezoelectric micro-pump, in which its input/output can be seen as two separate one-way valves, and its structure can be simplified for a simple beam model. Secondly, presents a port model based on bond graph port analysis, and selects the basic components in order to understand the micro-fluid characteristics of the micro-pump. Finally, gives the result of simulation to obtain the process of the volume change of micro-pump companying with the input pressure and the displacement of deformable film..
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