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Title: Supporting product innovation using 3D shape grammars within a generative design framework
Authors: Cui, Jia
Degree: Ph.D.
Issue Date: 2015
Abstract: In the high-tech period,the mix of information prevails every area.Design is a long-history subject mainly relies on designers' experiences, inspirations and aesthetic evaluations. Computer technologies involve in design process to support auxiliary assistances for designers and release them from some tedious time- and labor- consuming tasks, which named as Computer-aided Design (CAD). Collaborating with AI-based approaches (generic programming, evolutionary computation and generative strategy),design automation becomes promising in CAD area instead of being a tool merely. Advanced interactions between design and automatic system can be helpful to notice the intangible design information which belongs to the subjective area in design, now controlled by designers unintentionally. In this study, it puts efforts to enhance the communications between design- and technology- end. From shape representation, design process representation and design evaluation, design information can be recorded and used to build a generative environment for novel design solutions' exploration. It introduces a novel dynamic shape representationthe DSR shape, a 3D design grammarthe DSR shape grammar and a generative design frameworkthe User-inferred generative system with subjective design evaluation mechanism.In design process, designers always think the way how to transform a design before the final solution is confirmed. Inspired by the process, the dynamic information received form DSR shapes can be used to create novel alternatives conveniently. The DSR (Dynamic Shape Representation) shape represents a shape not only by the geometric and topological information (static), but also its generating process in terms of series of sequential design actions (dynamic). The new shape representation can provide flexible ways for more new shape generation in generative system.Based on the DSR shape, a 3D shape grammar and a general 3D interpreter are introduced for conceptual product design. The information process including design actions and steps of design creations can be represented by the proposed shape rules and design languages. Different from traditional shape grammars which are operated at the basis of shape replacement and sub-shape detection, I propose a new way to use shape rulesthe ACM model. It permits that using the same design language to different design cases (initial shapes) for novel exploration. Emergent shape is supported. Design languages are generated in 3D environment by designers and recorded by the proposed system. The rule-based mechanism can release designers from the limitations of pre-defined operating functions.
The generative design system explores design alternatives in a huge solution space. It generates many inspiring design alternatives with more un-interested ones simultaneously. The user-interfered generative approach makes use of users' knowledge at the early stage by the design languages generated by DSR shape grammars. Through the interactions between design languages and designers, the preferences of design proceeding can be saved into the grammatical languages. After information digitalization, the parameters used in generative mechanism can represent users' intention. More useful design solutions will be created. For better interactive design evaluation, a subjective design aesthetic evaluation method is proposed for design exploration. There are several design examples shown in this thesis, such as the embroidery design, chair design and cup design.Information flow from design end to system end is valuable to guide the automatic mechanism towards to the positive direction effectively. The final solutions and actions in design process can be captured by the proposed 3D shape grammars, which can be used in the user-interfered generative framework. The whole process is not pre-defined by system.Designers can communicate with the interpreter by design languages in terms of design visualization.The newly designers' preferences included in design languages can be involved in the generative process at the later stage. The subjective evaluation model is useful to find the users' interesting solution space for deep design exploration. Therefore, the proposed framework can be suitable for the design innovation in conceptual design.
Subjects: Computer-aided design.
Hong Kong Polytechnic University -- Dissertations
Pages: xv, 236 pages : color illustrations
Appears in Collections:Thesis

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