The Analysis and Measurement of Parts Form Similarity Based on Feature

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In terms of principle that similar parts have similar process, a measure method base on part's form similarity of feature is proposed. The form similarity measure of part is conducted in the similarity class of the whole feature. According to the layer of part's form information, the first stage of part form similarity measure is to match the maximal similar element of directional characteristics. The second stage of it is to measure the composite characteristics in the similar elements of directional characteristics. Finally, a comprehensive calculation of part form's similarity is made. The specific procedure of similarity measure is executed by the layer of part form feature information, which means different layers use different methods of similarity measure. By analyzing and defining the comparability of each layer, it matches the parallelism of each layer by the largest similarity degree from top to bottom and measures the parallelism of different layer' characteristics from bottom to top, and then use a case study of boxes parts to reveal the effectiveness of this methodology.

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Design history is helpful in aircraft structure design. Reasonably organizing and reusing design knowledge may contribute to aircraft design tasks. The paper studies the representation and reuse of aircraft design knowledge, and presents a case-based knowledge reuse method in structure design of aircraft components. Our method constructs the case representation by organizing the geometric and non-geometric features of parts, and adopts the similarity-based retrieving in case retrieval algorithm. A certain kind of parts on aircraft wing assembly is used as example to examine the algorithm.
This paper presents a method of object-oriented case representation, indexing and retrieving in process planning system for all kinds of parts using case-based reasoning. A method of measuring form similarity of parts is presented based on the object-oriented representation of parts types and parts features. An effective similarity metric is developed to measure the form similarity of parts between two parts which have different features or belong to different type of parts. And the most similar case can be retrieved rapidly and correctly.
To make full use of successful experiences of stamping process, a case retrieval methodology for stamping parts was proposed, which was based on the process similarity and the nearest neighbor technology. Firstly, features and constraints among the features were extracted from a three-dimensional stamping part model. Then the material thickness, strength and hardness of the stamping part were obtained from its material information table. Furthermore, from the view of the process similarity, the similarity degree was calculated with a dual-step analysis between a new stamping part and old parts in the case library. In the first step, by calculating the topology relation similarity degree based on flats, a group of closer old cases were obtained and some old ones were removed with little similarity with the new ones. Thus, the search space of the next step was narrowed down. In the second step, by analyzing features, constraints and material between the new cases and the group of closer ones, the integration similarity degree was calculated. Moreover, the closest case was retrieved. Finally, a case study was used to reveal the effectiveness of this methodology.
To facilitate product platform developing for product family design, an approach to evaluate the similarity of components was proposed. A uniform representation model of product family components was established based on the classification, topological relation and feature parameters of form features. The calculating methods of topological relation similarity degree, shape similarity degree and location similarity degree between the form features were discussed, and the process to evaluate the similarity of components was identified. Finally, an example for evaluating the similarity of a set of auto-body components was used to demonstrate the validity of this approach.
Evaluating the Similarity of Component s for Product Family Design
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  • Etc
Wei Junmin.etc, " Evaluating the Similarity of Component s for Product Family Design ", CAD & CG. Magn. China,8th ed, vol. 41. September 2001,pp.1218–1222.
The Similarity of Alalysis and Measure in Machine System
  • Zhou Meili
  • Li Wang Huanchen
Zhou Meili,Li Wang Huanchen, " The Similarity of Alalysis and Measure in Machine System ", China Mechanical Engineering. Magn. China,6th ed, vol. 7. 1996,pp.56–59.