Tensegrity Form-Finding Using Generative Design Synthesis Approach

2015 ◽  
Author(s):  
Amir Hooshmand ◽  
Matthew I. Campbell
Keyword(s):  
Design Problem ◽  
Graph Grammar ◽  
Test Problems ◽  
Generative Design ◽  
Form Finding ◽  
Design Synthesis ◽  
Tensegrity Structures ◽  
Graph Transformations ◽  
3D Shapes ◽  
Synthesis Approach

The aim of this research is to produce large irregular tensegrity structures using a generative design synthesis approach. Unlike most of the form-finding methods, the approach does not require the description of the connectivity of the tensegrity structures to define the shape of the tensegrities. It uses graphs to represent the tensegrity structures, which allows a very fast generation of stable tensegrity solutions for a given design problem. The graph grammar interpreter, GraphSynth, is used to carry out graph transformations, which define different configurations for a given design problem. After generating the graphs, they are transformed into meaningful 3D shapes. The effectiveness and robustness of the proposed method is checked by solving a variety of test problems.

Topology Optimization of Fluid Channels Using Generative Graph Grammars

2013 ◽  
Author(s):  
Amir Hooshmand ◽  
Matthew I. Campbell
Keyword(s):  
Topology Optimization ◽  
Design Methods ◽  
Graph Grammar ◽  
New Technique ◽  
Test Problems ◽  
Graph Grammars ◽  
Generative Design ◽  
Complex Problems ◽  
A New Technique ◽  
3D Shapes

This paper presents a new technique for topology optimization of fluid channels using generative design methods. The proposed method uses the generative abilities of graph grammars with simulation and analysis power of conventional CFD methods. The graph grammar interpreter GraphSynth is used to carry out graph transformations, which define different topologies for a given multi-inlet multi-outlet problem. The generated graphs are first transformed into meaningful 3D shapes. These solutions are then analyzed by a CFD solver to find the optimum. The effectiveness of the proposed method is checked by solving a variety of available test problems and comparing them with those found in the literature. Furthermore by solving complex problems the robustness and effectiveness of the method is tested.

scholarly journals A Computational Design Synthesis Method for the Generation of Rigid Origami Crease Patterns

2021 ◽  
pp. 1-57
Author(s):  
Luca Zimmermann ◽  
Kristina Shea ◽  
Tino Stankovic
Keyword(s):  
Rigid Body ◽  
Synthesis Method ◽  
Computational Design ◽  
Graph Grammar ◽  
Generative Design ◽  
Engineering Applications ◽  
Design Synthesis ◽  
Design Alternatives ◽  
Rigid Body Modes ◽  
Computational Design Synthesis

Abstract Today most origami crease patterns employed in technical applications are selected from a handful of well-known origami principles. Computational algorithms capable of generating novel crease patterns either target artistic origami, focus on quadrilateral creased paper, or do not incorporate direct knowledge for the purposeful design of crease patterns tailored to engineering applications. The lack of computational methods for the generative design of crease patterns for engineering applications arises from a multitude of geometric complexities intrinsic to origami, such as rigid foldability and rigid body modes, many of which have been addressed by recent work of the authors. Based on these findings, in this paper we introduce a Computational Design Synthesis method for the generative design of novel crease patterns to develop origami concepts for engineering applications. The proposed method first generates crease pattern graphs through a graph grammar that automatically builds the kinematic model of the underlying origami and introduces constraints for rigid foldability. Then, the method enumerates all design alternatives that arise from the assignment of different rigid body modes to the internal vertices. These design alternatives are then automatically optimized and checked for intersection to satisfy the given design task. The proposed method is generic and applied here to two design tasks that are a rigidly foldable gripper and a rigidly foldable robotic arm.

Layout synthesis of fluid channels using generative graph grammars

2014 ◽  
Vol 28 (3) ◽  
pp. 239-257 ◽  
Author(s):  
Amir Hooshmand ◽  
Matthew I. Campbell
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Large Scale ◽  
Three Dimensional ◽  
Graph Grammar ◽  
Future Research ◽  
Test Problems ◽  
Synthesis Methods ◽  
Graph Grammars ◽  
Design Synthesis

AbstractThis paper presents a new technique for shape and topology optimization of fluid channels using generative design synthesis methods. The proposed method uses the generative abilities of graph grammars with simulation and analysis power of conventional computational fluid dynamics methods. The graph grammar interpreter GraphSynth is used to carry out graph transformations, which define different topologies for a given multiple-inlet multiple-outlet problem. After evaluating and optimizing the generated graphs, they are first transformed into meaningful three-dimensional shapes. These solutions are then analyzed by a computational fluid dynamics solver for final evaluation of the possible solutions. The effectiveness of the proposed method is checked by solving a variety of available test problems and comparing them with those found in the literature. Furthermore, by solving very complex large-scale problems, the robustness and effectiveness of the method is tested. To extend the work, future research directions are presented.

Toward an automated approach to the design of sheet metal components

2003 ◽  
Vol 17 (3) ◽  
pp. 187-204 ◽  
Author(s):  
ADITYA SOMAN ◽  
SWAPNIL PADHYE ◽  
MATTHEW I. CAMPBELL
Keyword(s):  
Sheet Metal ◽  
User Interaction ◽  
Computational Design ◽  
Design Synthesis ◽  
Manufacturing Operations ◽  
Grammar Rules ◽  
Computational Design Synthesis ◽  
Representation Scheme ◽  
Sheet Metal Component ◽  
Synthesis Approach

The design of sheet metal components is perhaps one of the more challenging concurrent activities for design and manufacturing engineers. To aid this design process, a method is developed to encapsulate the constraints of sheet metal that make designing such components a tedious and iterative procedure. This project involves the implementation and testing of a geometric representation scheme for building feasible sheet metal components through the use of 17 grammar rules that capture manufacturing operations like cutting and bending. The implemented system has benefits both as a user interaction tool and as the basis for a computational design synthesis approach for designing sheet metal components. An example of a constructed sheet metal component is shown along with the method for invoking the sheet metal grammar to create this component.

Automated Assignment of Physical Effects to Functions Using Ports Based on Bond Graphs

2011 ◽  
Author(s):  
Bergen Helms ◽  
Hansjo¨rg Schultheiß ◽  
Kristina Shea
Keyword(s):  
New Technologies ◽  
Selection Process ◽  
Innovation Process ◽  
Oriented Graph ◽  
Computational Design ◽  
Graph Grammar ◽  
Automated Assignment ◽  
Bond Graphs ◽  
Design Synthesis ◽  
Physical Effects

Innovation processes are highly susceptible to cyclic influences, such as evolving knowledge due to new technologies. In order to cope with these challenge, computational support is required. Paper-based design methods have vast amounts of knowledge at their disposal in the form of design catalogues. However, lacking a computational implementation, these knowledge sources provide no support for considering dynamic influences in the innovation process. The presented method is targeted at making the physical effects contained in design catalogues available for computational design synthesis approaches. For this purpose, this paper introduces the notion of abstraction ports that is used to represent the valid mapping between functional operators and physical effects. For the automated assignment of abstraction ports, a method has been developed that analyzes the equation structure of physical effects. This approach is derived from the modeling technique of bond graphs and is independent of any selection process proposed by design catalogues. Moreover, it allows for the formalization of evolving knowledge in new physical effects that are not yet contained in design catalogues. The assignment of abstraction ports has been successfully validated through the formalization of the physical effects of two design catalogues. Future work comprises the integration of quantitative characteristics of physical effects and the realization within the object-oriented graph grammar system booggie.

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