A similarity fixture retrieval method based on N-dimensional vector included angle cosine

Abstract

The invention discloses a similarity fixture retrieval method based on N-dimensional vector included angle cosine. Firstly, attribute information of a workpiece to be designed is obtained to form an information collection vector. Then, according to the dimension of information set, the fixture cases are selected from the fixture case base. Calculating the cosine value between each corresponding information group by using the cosine formula of the vector included angle; Combining the weights of information tuples, the similarity values of information sets between jobs are calculated. Finally, the similarity between the fixtures is deduced from the similarity between the workpieces, and the similar fixture cases are pushed to the designers to modify. The invention realizes the auxiliary design work of the computer to the fixture designer. In the process of fixture design, the similar fixture case is retrieved in advance by using the similar fixture retrieval method of N-dimensional vector included angle cosine. The designer can modify the similar fixture according to the current demand, which reduces the repeated design process of fixture and improves the efficiency of fixture design.

Description

Technical field: [0001] The invention relates to a similar fixture retrieval method based on the cosine of an N-dimensional vector angle, belonging to the field of computer-aided design. Background technique: [0002] With the development of manufacturing and computer technology, higher requirements are put forward for the design efficiency of fixtures. The quality and design efficiency of fixtures are often the key links that restrict the product production cycle and quickly open the market. In the computer-aided design system, most of the fixture designs for new workpieces can be modified and reused based on the designed fixture cases in the fixture case library. Usually a complete set of fixture design system is developed based on a systematic and efficient PDM management platform, and the method of accurately and quickly retrieving similar fixtures from the process resource fixture case library has received extensive attention and research. [0003] However, the existin...

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Problems solved by technology

[0004] The purpose of the present invention is to propose a similar fixture retrieval method based on the cosine of the N-dimensional vector angle for the similar fixture retrieval process is loaded down with trivial details when the fixture design system is designed, the fixture information representation process is complicated and the retrieval result is uncertain etc.

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