| 1. |
- Bertoni, Marco, et al.
(författare)
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Using 3D CAD models for value visualization : an approach with SIEMENS NX HD3D Visual Reporting
- 2014
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Ingår i: Computer-Aided Design and Applications. - : CAD Solutions, LLC. - 1686-4360. ; 11:3, s. 284-294
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Tidskriftsartikel (refereegranskat)abstract
- Recent literature in Systems Engineering has suggested the use of “value” to drive decision-making activities during preliminary design, in particular when choosing technologies and components for a complex system. However, to correctly evaluate design trade-offs, a visual link has to be established between the results of the value model and a product shape/geometry. This paper proposes the use of color-coded 3D CAD models to support the visualization of value analysis results in a Stage-Gate® process. The approach has been developed and exemplified within a case study related to the design of an aero-engine component, and has been demonstrated using SIEMENS NX HD3D Visual Reporting. The results of verification activities conducted in a laboratory setting show that the use of color-coded 3D CAD models increases the decision makers’ awareness of value-related information in a Stage-Gate process.
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| 2. |
- Boart, Patrik, et al.
(författare)
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Making cross-company information available in the conceptual phase
- 2006
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Ingår i: Computer-Aided Design and Applications. - : CAD Solutions, LLC. - 1686-4360. ; 3:6, s. 675-682
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Tidskriftsartikel (refereegranskat)abstract
- In new business-to-business relations within the aerospace industry, companies join together in partnership to perform product development, taking full responsibility for their product during its entire life cycle. This paper describes a method on how these downstream effects can be simulated in a cross-company collaborative situation. A case study was conducted where a jet engine component manufacturer and a tool manufacturer used each other's expertise in a collaborative approach to make "holes" in a jet engine component. Ten conceptual jet engine frames were collaboratively evaluated within two working days. The distributed engineering environment creates a new situation for the partnership companies by allowing them to work efficiently within the activities that have been incorporated into the distributed engineering environment. Downstream effects of the overall system can then be evaluated already in the conceptual phase, thus allowing the partners to design the life cycle properties of their common product
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| 3. |
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| 4. |
- Hagström, L., et al.
(författare)
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Integration of environmental assessment functions in design and product development tools
- 2004
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Ingår i: Computer-Aided Design and Applications. - : CAD Solutions, LLC. - 1686-4360. ; 1:1-4, s. 33-42
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a computer-based environmental tool that will make it possible for product designers to integrate environmental assessments into their work. The environmental tool described in this paper is a concept for integrated environmental assessment functions in design and product development tools. The concept presents a way of reducing modelling time by making simplified assessments. The concept, and finally the environmental tool, is based upon companies' demands and wishes regarding how a tool for making environmental assessments during the product development process might be useful for them. The intended user is the company product designer.
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| 5. |
- Heikkinen, Tim, et al.
(författare)
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Incorporating Design for Additive Manufacturing in Multidisciplinary Design Automation – Challenges Identified
- 2020
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Ingår i: Computer-Aided Design and Applications. - : CAD Solutions. - 1686-4360. ; 17:5, s. 936-947
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Tidskriftsartikel (refereegranskat)abstract
- One interesting method to take advantage of the particular capabilities of Additive Manufacturing is to utilize a combination of lattice-structures and topology optimization. This paper presents the results and experiences from attempting to incorporate these in an existing multidisciplinary design automation system within the aerospace industry. A combined state of art and practice is outlined with discussions regarding challenges in current commercial CAD tools, multidisciplinary design automation, and with respect to aerospace requirements.
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| 6. |
- 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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| 7. |
- 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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| 8. |
- Johansson, Joel, 1978-
(författare)
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A Feature and Script Based Integration of CAD and FEA to Support Design of Variant Rich Products
- 2014
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Ingår i: Computer-Aided Design and Applications. - : Taylor & Francis. - 1686-4360. ; 11:5, s. 552-559
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Tidskriftsartikel (refereegranskat)abstract
- The focus of the research presented in this article has been an integration of a CAD-system and a FEA pre-processor to automatically develop a complete FEA-models in order to make simulation based design possible. The article presents a prototype system that was developed to automate the simulation of the behavior of ski-racks mounted on cars during collision. This type of simulations requires mesh models containing structured mesh, an issue solved in the presented system and that is presented in the article. It is also shown how to make it possible to introduce contacts, loads, constraints, and other FEM-properties based on CAD-geometry.
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| 9. |
- Jonsson, Carl-Johan, et al.
(författare)
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A case-based reasoning method including tooling function for case retrieval and reuse in stamping tooling design
- 2023
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Ingår i: Computer-Aided Design and Applications. - : CAD solutions. - 1686-4360. ; 20:5, s. 839-855
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Tidskriftsartikel (refereegranskat)abstract
- Design of sheet metal forming tooling is currently based on that experienced tooling designers with good knowledge of how stamping tools previously have been designed and operated in production, apply their knowledge when making a new design. For retrieving former designs, they often need to rely on their good memory. In this paper, an automatic method for retrieving relevant former cases is presented. A major challenge is defining the similarity between the current and the former cases i.e., finding the relevant parameters to include in the CBR (Case-based reasoning) search. This is here addressed by using CAD model parameters both from former components and the tooling for their production. By interviewing tooling designers in industry, a set of relevant parameters has been identified. To arrive at the correct weight of each parameter, a genetic algorithm has been used to optimize the search results. This resulted in a quick and automated way of retrieving the most relevant former cases and presenting them to the designer. The method has been tested on actual cases with promising results. This has the potential of making sheet metal part and tooling design less reliant on memory and experience.
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| 10. |
- Kjellander, Johan A. P., 1952-, et al.
(författare)
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An integrated platform for 3D measurement with geometric reverse engineering
- 2009
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Ingår i: Computer-Aided Design and Applications. - USA : CAD Solutions, LLC. - 1686-4360. ; 6:6, s. 877-887
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Tidskriftsartikel (refereegranskat)abstract
- Geometric Reverse Engineering (GRE) can be described as the process of fitting surfaces to point data and connecting them to topologically well defined CAD models. We have mounted a laser profile scanner on an industrial robot with a turntable and interfaced them to an Open Source CAD platform. With this tool we have developed an integrated system that can automatically plan and control the robot movements needed to measure an object of unknown shape. Details of this work have been published earlier but we have not described the platform used to integrate the hardware with the GRE software. This paper illustrates the multi disciplinary nature of that problem and investigates what the requirements are for a suitable CAD tool.
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| 11. |
- 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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| 12. |
- Ma, J., et al.
(författare)
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Normal Vector Estimation for Point Clouds via Local Delaunay Triangle Mesh Matching
- 2013
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Ingår i: Computer-Aided Design and Applications. - : CAD Solutions, LLC. - 1686-4360. ; 10:3, s. 399-411
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Tidskriftsartikel (refereegranskat)abstract
- Reliable estimation of normal vectors for point clouds is of practical importance in computer-aided geometric modeling and inspection. This paper introduces a new normal vector estimation method for point clouds based on the matching results of the local Delaunay triangle mesh formed at each point. The local mesh is a manifold patch of Delaunay triangles and resembles an open umbrella. According to the matching results of these umbrellas, the local Delaunay neighbors at each point can be reliably identified, which leads to accurate normal vector calculations. Compared with the existing methods, the proposed method yields normal vectors of notably improved accuracy, especially for points near edge or corner features. The improvement has been demonstrated using both simulated and scanned point cloud data sets.
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| 13. |
- Müller, Jakob, 1987, et al.
(författare)
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Function model-based generation of CAD model variants
- 2021
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Ingår i: Computer-Aided Design and Applications. - : CAD Solutions, LLC. - 1686-4360. ; 18:5, s. 970-989
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Tidskriftsartikel (refereegranskat)abstract
- A product is an artefact which fulfils a specific function. However, most design automation (DA) approaches wich are used to generate multiple alternative design concepts focus on the generation of CAD models. These neglect to represent the functional aspects of the product, and are furthermore deemed too rigid for the introductino of novel solutions. Pure function modellingappraoches on the other hand provides methods such as design rationale representation, introduction of novel solutions or instantiation of combinatorial alternative concepts, but the resulting models are insufficient for analysis. To alleviate this, a design space exploration (DSE) approach which couples function modelling and CAD is presented. The approachlinks the product’s design rationale modelled in enhanced functionmeans (EF-M) to a DA approach via the here introduced object model for function and geometry (OMFG). The resulting method is able to automatically generate CAD models of alternative concepts based on combinations of alternative design solutions defined in the function model. The approach is presented through a case study of an aircraft engine component. Sixteen different concepts are generated based on four functions with alternative solutions. In an initial computation of the effort to generate all alternative concepts, the DA aspect of the approach’s effort pays off as soon as five functions have two or more alternative solutions. Beyond the benefit of efficient instantiation of CAD models of alternative product concepts, the approach promises to provide the design rationale behind each concept, and thereby a more systematic way of exploring and evaluating alternative design concepts.
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| 14. |
- 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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