This paper proposes an interactive method for product design based on dual-domain transformations from the principle domain to physical domain. The method considers that product design is a process to search proper actions or reactions to interact with product’s surroundings. Such actions or reactions are used to develop elements of a product by building energy-flow and force-path connections. The actions and reactions of energy flows, force paths, space and interface constraints are physically formed through the dual-domain transformation. A multi-purpose electric vehicle is developed using the proposed method.

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