The Design Exemplar: The Foundation for a CAD Query Language

Divekar, Ameya; Summers, Joshua D.

doi:10.1115/detc2003/cie-48228

Cited by 2 publications

(1 citation statement)

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“…The modified model is presented in Figure 2 To improve the querying capabilities of the design exemplar, it has been provided with tools such as exemplar networks and logical connectives. Logical connectives [11] provide a vocabulary which can be used to author complex exemplar queries and static networks [12] help in authoring exemplars by the reusing existing exemplars. These tools are discussed briefly in the following sections.…”

Section: Ab-ementioning

confidence: 99%

A Case Study in the Use of Design Exemplar as a Search and Retrieval Tool

Anandan

Srirangam

Summers

2008

Volume 3: 28th Computers and Information in Engineering Conference, Parts a and B

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This thesis presents a case study examining the suitability of design exemplar technology as a CAD query tool for an industrial scenario. The search and retrieval of geometrically similar mold inserts to save tooling cost for a tire manufacturing company is taken as the case study. During the implementation of the design exemplar as a CAD search and retrieval tool, several limitations of it are identified, such as the difficulty and tediousness in authoring exemplars for real world problems. To overcome these limitations, a new mathematical-based exemplar approach (mathematical model) is developed for tire mold insert retrieval. This approach calculates a set of maxima and minima based on the specifications of the target mold insert and identifies similar molds that fall within these specifications. Though the mathematical model requires less effort to author the exemplar queries than the initial boundary envelope approach, it has an unreasonably high time complexity when implemented using design exemplar. A partially developed mathematical-based exemplar takes 30 seconds to run through a sample database of 10 mold inserts. Assuming that a fully built exemplar would take more time when run on a database of 55000 mold inserts as it would have more number of constraints added to it, the approach was not implemented through design exemplar tool. However, as this exemplar approach gives a satisfactory theoretical solution to the problem, the exemplar is hard-coded in an independent C++ program to suit the requirements at hand. The mathematical-model which is implemented in an independent C++ program successfully searches through the complete database of 5500 tire mold inserts, retrieving similar mold inserts, in a span of one second, a huge efficiency gain when compared with the traditional exemplar system. Apart from the time reduction for the search and retrieval, the exemplar inspired program has an additional advantage in that no geometrical entities must be handled to build exemplars. However, the mathematical model may result in several false positives that must be manually eliminated. In an experiment, 15 mold inserts were randomly selected from the database and were searched for similar mold inserts using the program developed. In the experiment, it was observed that there were no false negatives and the number of false positive ranged from 0 -2. Considering the size of the database which is roughly 5500 mold inserts, the mathematical still provides advantages in search and retrieval. It is still good because 5500 have been iii reduced on an average to 9. During the experiment, it as been found that 80 percent of the mold inserts which were tested have similar mold inserts. The design exemplar tool could have helped company to save the tooling cost of $184,000 per annum by providing them with a search and retrieval tool. However, it was not implemented because of some of the limitations mentioned above. Still the strategies of design exemplar are valid for querying CAD models. This is proved by the fact that ...

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Section: Ab-ementioning

confidence: 99%

A Case Study in the Use of Design Exemplar as a Search and Retrieval Tool

Anandan

Srirangam

Summers

2008

Volume 3: 28th Computers and Information in Engineering Conference, Parts a and B

Self Cite

View full text Add to dashboard Cite

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The Design Exemplar: A New Data Structure for Embodiment Design Automation

Summers¹,

Bettig

Shah

2004

Journal of Mechanical Design

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A key issue in developing new intelligent computer aided design and manufacturing tools (CAD/CAM) is knowledge representation. Engineering knowledge has been represented in many forms, such as rule sets, design procedures, features, frames, and semantic networks. Some of these are domain dependent, some are query dependent, and some require specialized inferencing engines or solving algorithms, thus providing a severe limitation for exchange and re-use of design knowledge. A standard representation structure that is capable of encapsulating different types of knowledge would be a useful tool. The design exemplar provides a standard representation of mechanical engineering design problem knowledge based upon a canonically derived set of entities and relationships. The data structure of the design exemplar facilitates four basic design tasks: pattern matching, property extraction, design validation, and change propagation. This paper shows that it is possible to map the design exemplar to other representations (procedures, rules, and features). The concept of integrating atomic design exemplars into composite networks for performing complex design tasks is also introduced as a tool for developing and applying the design exemplar in engineering design automation.

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The Design Exemplar: The Foundation for a CAD Query Language

Cited by 2 publications

References 5 publications

A Case Study in the Use of Design Exemplar as a Search and Retrieval Tool

A Case Study in the Use of Design Exemplar as a Search and Retrieval Tool

The Design Exemplar: A New Data Structure for Embodiment Design Automation

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