Contrast, analog extending method for product function

Abstract

A contrast similar expansion method of product function is characterized by provided with a known product knowledge base storing a function tree and bounded relation information of known product and building an original function tree and bounded relation information of novel product; on the base of combining a similar theory and an extension theory and according to the specific needs of product designers, any function node of the original function tree of novel product is compared with the product functions in the known knowledge base; according to a certain rule, the novel functions are appended to the product function tree to generate a novel product function tree. Compared with the original product function tree, the novel product function tree is richer; therefore, the possibility of obtaining an innovation function is greatly increased. The invention gives full play to the guiding function of designers in the process of product design and makes designers release from the complicated and mechanical work of data comparison, thereby providing a design method which has high freedom, strong deduction capacity and aims at innovation of product function.

Description

technical field [0001] The invention relates to a specific method for establishing a function tree in auxiliary product function design, in particular to a method for establishing an auxiliary function tree based on similarity theory and extension theory. Background technique [0002] Conceptual design is the most creative activity in the product design phase. It determines 80% to 90% of the product life cycle design cost, and the design defects produced by it cannot be made up by the subsequent design process. Functional decomposition is a critical stage of conceptual design. Building a functional tree is one of the main methods for functional decomposition. The root node of the tree is the function transformed from the user's needs, and the leaf node is the basic function that does not need to be decomposed. At present, the establishment of product function tree mainly depends on the knowledge level of domain experts. However, it is difficult to consider the problem very...

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Problems solved by technology

This method proposes an improved similarity calculation formula to calculate the comparison similarity, but in this method, the improved similarity calculation formula is a non-linear formula, which is inconvenient for people's conventional understanding and has a large amount of calculation; The comparison similarity calculated by this method is not suitable for the proposed function tree extension method. The greater the comparison similarity between two comparison similar functions, the smaller the calculated comparison similarity, and the greater the possibility of being discarded. It is obviously contradictory to the original intention of the method and the actual situation; at the same time, this method proposes a simple function tree comparison and similar extension method, without considering whether the number of layers of the original function tree of the new product and the compared similar function tree are the same, nor does it consider Although the door type of the vertices of the original function tree of the new product has also expanded the original function tree, there are a certain amount of obvious wrong solutions in the extended solution, which increases the workload of subsequent function tree solutions

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