| 1. |
- Heikkinen, Tim, et al.
(författare)
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Review of CAD-model Capabilities and Restrictions for Multidisciplinary use
- 2018
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Ingår i: Computer-Aided Design and Applications. - : Taylor & Francis. - 1686-4360. ; 15:4, s. 509-519
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Tidskriftsartikel (refereegranskat)abstract
- Product development is an iterative process, partially due to changes in both company internal and external product requirements, resulting in changes to the product under development. These changes might require recapitulation of design rationale and result in re-doing assessments and syntheses of different kinds. One way to support this work is to proactively model in such a way that as much as possible of the previous work can be re-used. Not only within one product development project but also across and to future ones. Modelling for re-use can be done by documenting design rationale and formalising performed activities as design guidelines or computer scripts. To be able to find and re-use this information it could be attached to the product features which it relates to. Since geometry is such a core product characteristic, especially within the mechanical industry, and is often modelled as CAD-models, this paper presents a review of CAD-model capabilities and restrictions to serve as a carrier of multidisciplinary information. This is done by; enquiring three Swedish companies, exploring an automated Finite Element Analysis method utilising the CAD-model as a carrier of information, and reviewing different CAD software capabilities. Results show that there are at least seven extension techniques, out of which all are currently being used or considered to be in the future, by at least one company. Further, depending on the extension technique, extendibility and human-comprehension of the added information differ.
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| 2. |
- Hjertberg, Tim, et al.
(författare)
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A tool for obtaining transparency and traceability in heterogeneous design automation environments
- 2018
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Ingår i: Computer-Aided Design and Applications. - : Taylor & Francis. - 1686-4360. ; 15:4, s. 488-500
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Tidskriftsartikel (refereegranskat)abstract
- Today, CAD-system are used for much more than just geometric modeling. They are complemented by various software and information sources forming a complete environment for handling all life-cycle aspects of the product. In such systems, the CAD-system works as a central hub. The software and information sources may be of various types making the system highly heterogenous. This presents problems with transparency and traceability in the system making long term management difficult. In this paper, a novel tool is presented to keep track of the dependencies between the various parts of such systems providing an overview and making it possible to predict the effect of proposed changes and facilitating long term management. The tool is tested in a highly heterogeneous environment at a manufacturer of aerospace components, with the result that the traceability is expected to increase at the expense of that time must be spent on defining dependencies and meta-information as the system is evolving.
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| 3. |
- Ma, Ji, et al.
(författare)
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Automatic construction of watertight manifold triangle meshes from scanned point clouds using matched umbrella facets
- 2017
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Ingår i: Computer-Aided Design and Applications. - : CAD Solutions, LLC. - 1686-4360. ; 14:6, s. 742-750
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Tidskriftsartikel (refereegranskat)abstract
- Generation of watertight manifold triangle meshes from scanned point clouds has emerged asa key task in computer-aided design and inspection. An effective algorithm is presented in thispaper, targeting the automatic creation of such triangle meshes from unorganized, scanned datapoints. The algorithm builds on the initial version of the Umbrella Facet Matching (UFM) algorithmdeveloped by the authors. The mesh generation process starts with Delaunay triangulation of thegiven point cloud to determine the Delaunay triangle set at each data point. The algorithm thenseeks to iteratively generate, in parallel, the local 2-dimensional manifold triangle mesh, resem-bling the shape of an open umbrella, at each data point from its Delaunay triangle set that fullyoverlaps with its neighboring umbrellas. Particularly, a four-level inheritance priority queuing mech-anism is introduced to enhance the prioritization and ordering of the Delaunay triangles at eachdata point in order to facilitate the iterative establishment of the fully matched umbrella accordingto the most updated umbrella facet matching results. The presented method has been imple-mented and validated through a series of minimally post-processed scanned point cloud data setsfrom physical objects with complex geometry. Improved computational convergence has beenobserved, which promotes the construction of watertight manifold triangle meshes. The compar-ison results have demonstrated that the enhanced UFM algorithm outperforms the initial UFMalgorithm and an industrial software tool in creating quality triangle meshes from actual scannedpoint clouds
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| 4. |
- Åkesson, D., et al.
(författare)
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Using 3D direct manipulation for real-time structural design exploration
- 2018
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Ingår i: Computer-Aided Design and Applications. - : CAD Solutions, LLC. - 1686-4360. ; 15:1, s. 1-10
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Tidskriftsartikel (refereegranskat)abstract
- Impact of decisions in the design process is initially high and declines as the design matures. However, few computational tools are available for the early design phase, thus an opportunity exists to create such tools. New technology opens up new possibilities to create new and novel computational tools. In this work an existing application is adapted for a new novel 3D input device that is named the Leap Motion controller. The controller allows the user to interact with 3D objects on the screen by using fingers and hands. The of result of this work is a conceptual design application which enables very direct manipulation of 3D objects on the screen, which has not before been achieved for this type of application in 3D. An improved human-computer interaction can potentially improve the users understanding of the structural behavior of a model, cognitive engagement in the design task, and encourage further design exploration. Three different cases are implemented which aims to enable the user to explore different design options with emphasis on geometrical form, as this has the greatest potential to improve the structural performance. The case studies demonstrate new potential for building engineering intuition and improving design space exploration through very direct manipulation in 3D.
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