Modeling Approach of Functional Model for Multidomain System∗

Modeling approach to obtain unified, hierarchical and legible model for multidisciplinary system is very important for performance prediction and analysis in complex system design. In this paper, graphic modeling methods, such as the use of block diagrams, bond graphs, functional models and object-oriented models, are reviewed firstly. Then, the modeling methods of bond graphs and functional models are compared, and a set of simplified fundamental items and a systematic modeling procedure to establish functional models are proposed. Finally, the proposed modeling method of functional models is applied to several examples of electrical, mechanical and hydraulic systems, and simulations performed on Simulink verify the practicability and effectiveness of the proposed modeling approach. The proposed modeling approach of functional models helps engineers to carry out modeling in an orderly way, so that the functional modeling method can be used by more engineers and applied in engineering analysis.