A Grammar-Based Functional Synthesis Approach for Complex Mechanisms through Assigning Functional Requirements to Graphic Carriers
The function-based synthesis is a major approach for the AI (artificial intelligence)-based type synthesis of complex mechanisms. Due to a lack of knowledge to support functional reasoning from the behaviors of constituent basic mechanisms to the whole functional behaviors of complex mechanisms, the AI-based type synthesis of compound mechanisms is still a hard challenge. In this paper, a grammar-based functional synthesis approach is proposed for carrying out the type synthesis of complex mechanisms. The functional synthesis rules, in which the functional requirements and the topological connections among functional members are included, are defined with the aid of nine kinds of common functional requirements that are primarily exhibited by complex mechanical systems. Through assigning a function as well as topological connections to each element in the graphic carrier according to the grammar-based functional synthesis rules, the type synthesis process for complex mechanisms is carried out automatically. Since the divergence creative design technique is applied, this system can efficiently expand the synthesis solution space of complex mechanisms, and more innovative design schemes for complex mechanisms can be figured out. For extremely complex mechanisms, through dividing the design problem into several parts, and doing logical operation to each part respectively, the function-based synthesis for complex mechanisms can also be solved by combing the generated schemes from each part.
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The authors gratefully acknowledge that this research project is supported by the Chinese Natural Science Foundation Committee. The grant numbers are: 51375496 and 51775557.
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