In this paper the approach of formal, graph-based design languages has been implemented for the development of a Structure Design Language. In order to achieve this, a design language has been developed for execution in the design compiler 43(TM) which enables the generation of automotive structural components. Graph-based design languages consists of a set of basic components (i.e. the vocabulary) and a set of rules (i.e. the design patterns) and enable the designer to define a formal and domain independent graph-based representation of a design space. The specific meaning of the design language vocabulary represented by graph nodes is defined by the content of the vocabulary definitions and is therefore a priori neither restrained to geometry nor to physics nor to any other specific design domain. Instead of a manipulation of a certain geometrical object in the design representation by a design rule directly expressed in geometry however, the design rules are expressed as abstract graph transformations. This allows to apply modifications at an abstract intermediary level of the formal design representation (i.e. the so-called design graph) of the design. By applying the design modification rules, the topology and the parameters of a design can be modified easily. The rules and the vocabulary are defined by the decomposition and recombination of a beam structure. By execution of the production system, various structures corresponding to various design graphs were automatically generated. Out of these meta-models in form of the design graphs the associated CAD- and FEM-models were also automatically derived. Parametrical and topological modifications were performed manually to the design graph by design rules and large variants of these structures were generated in short time (cut down to weeks instead of months as it would be necessary if the same work had to be performed manually). As an outlook, further work is planned for advancement of the design language in order to feed-back the results of a FEM-analysis to the design language automatically. With this, it will be possible to evaluate the structures within the design compiler and perform automatically topological modifications by knowledge-based rules. The task of parametrical and topological design rule modifications has still been done manually in this study, but is of course the next promising candidate for successful design automation.
Design acceleration of automotive structures by structure design language
Entwurfsbeschleunigung bei Automobilstrukturen durch eine Strukturentwurfssprache
2006
25 Seiten, 16 Bilder, 43 Quellen
Conference paper
English
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