| 1. |
- Dagman, Andreas, 1976, et al.
(författare)
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A Study of Customers' and the Automotive Industry's Attitude Regarding Visual Quality Appearance of Split-Lines
- 2004
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Ingår i: 4th International Conference on Advanced Engineering Design AED' 2004; Glasgow, Scotland, UK; 5-8 Sept 2004. - 8086059413
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The exterior design of an assembled car body consists of a number of components, which are in spatial relation to each other. These relationships have a significant impact on the overall perceived Visual Quality Appearance, (VQA) of a car body exteriorly. The automotive industry has the ambition to produce products with high VQA. For companies, which are producing products composed of several components, it is costly and time consuming to consider and control the impact of geometric variation. This paper investigates the industrys and the customers attitude regarding VQA of split lines, by use of an emperical study. It also investigates if there is a correrlation between the car brand that customers think possesses the best VQA regarding split lines and measurement data of the geometrical variation of split lines of those car brands.
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| 2. |
- Dagman, Andreas, 1976, et al.
(författare)
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An Evidence-Based Study on Teaching Computer Aided Design in Higher Education during the COVID-19 Pandemic
- 2022
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Ingår i: Education Sciences. - : MDPI AG. - 2227-7102. ; 12:1
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Tidskriftsartikel (refereegranskat)abstract
- The pandemic has had a major effect on engineering education, transforming both current and future teaching practice. The physical meetings between student and teacher have during the pandemic been replaced by online contact and recordings of lectures and demonstrations. In this paper, the focus is on computer aided design (CAD) teaching for first-year engineering students. CAD is a topic usually characterized by a close contact by student and teacher, with hands-on instruction at the computer using the CAD software. In the paper, the experiences and learnings from the rapid shift to on-line teaching in CAD are summarized and discussed, and learnings and takeaways for a redesign of future CAD teaching are discussed. Both the students’ learning and their mental wellbeing are evaluated. It is found that on a general level, the students were satisfied with the online teaching and rated it as better or equal to traditional teaching. However, there is still room for improvement, since some students found the situation stressful and pointed out the difficulty to ask questions online. The findings are based on a student survey, existing literature, and the authors own teaching practices during the pandemic.
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| 3. |
- Dagman, Andreas, 1976, et al.
(författare)
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Current State of the Art on Repair, Maintenance and Servicability in Swedich Automotive Industry - a Virtual Product Realization Approach
- 2011
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Ingår i: Proceedings of EcoDesign2011: 7th International Symposium on Environmentally Conscious Design and Inverse Manufacturing. - 9789400730106
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Konferensbidrag (refereegranskat)abstract
- Sustainability with its three aspects, economy, ecology and social, is gaining more and more attention in industry as well as in academia. One way of increasing sustainability is to increase the life length of a product as well as ensuring performance by making it easy to maintain and repair. The consumer trends are moving towards a more positive attitude to buy a function rather than the product itself. By having this approach aspect such as maintenance, service and repair (MSR) is put in a different light. This paper presents a interview study with the intention to investigate the state of the art regarding maintenance and repair in four different Swedish automotive manufacturing companies with emphasis on how virtual product realization is considered and implemented. It was stated during the interviews that the use of simulation and analysis methods with emphasis on MSR differs and that it sometimes can be troublesome to make impact in project discussions etc. due to their difficulty in delivering hard figures e.g. cost, weight, CO2 emissions etc.
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| 4. |
- Dagman, Andreas, 1976, et al.
(författare)
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Form division in automobile design - linking design and manufacturability
- 2006
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Ingår i: Design 2006 9th International Design Conference, May 15-18, 2006, Dubrovnik, Croatia, Editor Marjanovic´, D. - 9536313790 ; 1, s. 495-502
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Konferensbidrag (refereegranskat)
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| 5. |
- Dagman, Andreas, 1976, et al.
(författare)
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Gometrically Robust Form Division
- 2007
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Ingår i: Proceedings of the ASME 2007 Internatioinal Design Engineering Technical Conferences & Computers and Information in Engineering Conference. ; , s. 9-
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Konferensbidrag (refereegranskat)abstract
- By combining a Computer Aided Industrial Design (CAID) tool with a Computer Aided Tolerancing (CAT) tool, concurrent work between two related, but in industry often separated, areas with correlated product design features is facilitated. This paper presents an analysis tool that allows the creation and evaluation of split-lines in design concepts with respect to geometrical robustness and aesthetics. The aim with the analysis tool is to create products that are insensitive to manufacturing variation with the industrial design intent preserved. Since the split-lines are clues to detecting variation in assembled products, as well as part of the design language and the characterization of the product, it is important to work with these issues concurrently. The platform concept has been increasingly adopted in companies which, in many cases, provide an inheritance of the locating schemes, thus affecting the geometrical robustness of the concept, between models and sometimes even brands. This means that the parts creating an assembled product need to be designed in such a way that they satisfy the locating scheme configuration to achieve a geometrically robust solution. The functionality of the analysis tool has been demonstrated on an automobile body.
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| 6. |
- Dagman, Andreas, 1976
(författare)
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Increased Visual Quality through Robust Split-Line Design
- 2005
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- In the early phases of the product development process, the initial product geometry can be a non-divided shape, just a shell. This initial product geometry has to be divided into individual parts in order to manufacture and fulfil the functionality of the product. In the case of automobiles, these parts can be fenders, doors, hoods, etc. The design of the parts is influenced by several aspects, like design language, geometrical dimensioning, crash safety, wind resistance, etc. The decisions regarding how to divide and design the parts are made in multidisciplinary teams. The final appearance of the spatial relations between the parts, i.e. the split-lines, in an assembly affects the quality appearance of the product. This in turn influences the sales of the product. By supporting the product development process with methods, tools and guidelines, the quality of the final solution will improve.The focus of the presented research has been on how to split the initial product geometry in order to achieve a geometrically and visually robust solution. In other terms, it has been on how the split-line shall be designed and placed in order to achieve as geometrically and visually robust solution as possible. Geometrical robustness aims at the dimensional and functional aspects of the product. Visual robustness is more concerned with the aesthetic aspects of the product. A geometrically and visually robust solution suppresses part and assembly variation. This leads to a decreased geometrical output variation, the variation between parts the customer sees. A geometrically robust solution often results in a visually robust solution. A geometrically sensitive solution, on the other hand, can be made visually acceptable in some cases by controlling the position and the direction of the split-line. Different areas are more or less sensitive for the eye. The research results have contributed to an enhanced knowledge and a supporting tool in the area of geometrical and visual robustness. The tool supports the division of initial product geometry with respect to geometrical robustness. The enhanced knowledge enlightens how different assembly aspects influence the final result when assembling. There is also a contribution concerning customers and the industrys attitude regarding the visual quality appearance of split-lines. It concerns more the aesthetic aspects of the split-line design. The conclusion of the presented research project is that the division of the initial product geometry, in order to achieve a geometrically and visually robust solution, is influenced by many aspects. These aspects can sometimes be antagonists and there have to be a compromise between them. Also, the tool presented does calculate and visualize robust areas between two geometries to be split and this result can hopefully be used as a support in the product development process. The customers consider high visual quality of split-lines as important and that narrow split-lines is of importance for the perceived quality but there is other factors that is influencing the quality appearance of split-lines. By using the presented tool and by using the knowledge, gained from this research project, the chances of creating products with high visual quality will increase with decreased cost and time for the product development process.
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| 7. |
- Dagman, Andreas, 1976
(författare)
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Robust Form Division - Manging the Effect of Manufacturing Variation
- 2007
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Product development is a necessity for manufacturing companies to keep market shares as well as gaining new ones. Decisions made in the beginning of the process will affect the final product to a large extent. It is thereby of great importance to be able to detect possible obstacles in the early phases of the product development process. Manufacturing variation is always present during production and needs to be treated. By designing robust, the manufacturing variation will influence less. A robust solution suppresses manufacturing variation whereas a sensitive one amplifies it. The appearance of the spatial relation between visible parts (i.e. split-lines) in an assembled product is important for the overall quality appearance of the product. Variation in the split-lines affects the visual quality appearance of the product. Split-lines are the result of a form division activity carried out in the early stages of the product development process, most likely by industrial design. Two main relations, gap and flush of a split-line, have been in focus in this thesis; the relations shall be tight and parallel. The position of the split-line can in certain cases determine the robustness of the assembled product, which has been used as a prerequisite in this thesis. Such can be the case if the locating schemes are pre-specified due to use of product platforms or reuse of assembly lines. The main objective of this research project is to support the form division activity in the concept development phase. The focus in the work is on reducing the effect of manufacturing variation by creating robust form division concepts. The adopted approach has been to link computer-aided tolerance analysis with computer-aided industrial design to support the form division activity in order to achieve a robust solution in accordance with aesthetical aspects. This result in solutions that meets both aspects as much as possible can be found. The analysis results are presented in a way suitable for shape generation and not as numerical parameter values, which are commonly used today. Throughout this research project, empirical studies have been woven together with synthesis activities to make a proposal of how to support form division. Empirical studies, in the form of interviews, have provided an understanding of the industrial form division activity as well as the customer perspective on split-line appearance.The main conclusion from this thesis is that today industrial designers are creating the form division concepts with minor considerations to robustness. The form division concept is then iterated with engineering design to find a robust solution, fulfilling aesthetical, functional and manufacturing requirements. These iterations are often time consuming. The proposed toolbox allows for aesthetical aspects as well as robustness to be considered simultaneously. Thereby, timely and costly, design loops can be reduced.
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| 8. |
- Dagman, Andreas, et al.
(författare)
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Split-line design for given geometry and location schemes
- 2007
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Ingår i: Journal of engineering design (Print). - : Informa UK Limited. - 0954-4828 .- 1466-1837. ; 18:4, s. 373-388
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Tidskriftsartikel (refereegranskat)abstract
- The spatial relations between parts in an assembly can be critical for the functional and aesthetic quality of a product. In the case of the automobile, these relations can be between doors, fenders, hood, panels, and so on. Variation in these relations, caused by part and assembly variation, influences the output variation, which is what the customer sees and judges. This paper presents a computer-aided tolerancing tool that supports and improves split-line design with respect to geometrical variation. A split-line is the relation between two mating parts over a distance. The design and placement of a split-line in an automobile body are influenced by several aspects such as design language, geometrical dimensioning, crash safety, and so on. In this paper only the geometrical dimensioning aspects have been considered. The research has been carried out using simulations and analyses in a computer-aided tolerancing software. The tool presented describes a way to calculate and visualize the geometrically most robust area and split-line between two parts. The findings from the research show that it is difficult to calculate and visualize the result in flush and gap directions in the same way. The tool gives insight into how the configuration of the locating schemes influences the geometrical robustness of the design.
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