| 1. |
- Landahl, Jonas, 1986, et al.
(författare)
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Using product and manufacturing system platforms to generate producible product variants
- 2016
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Ingår i: Procedia CIRP. - : Elsevier BV. - 2212-8271. ; 44, s. 61-66
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Konferensbidrag (refereegranskat)abstract
- Product platforms have proven efficient as a means to reduce lead-time and increase product quality simultaneously. When using platforms to generate a family of products, the number of variants that need to be managed in manufacturing increases. To succeed with this, the manufacturing system needs to be maintained in a similar level of flexibility as the product platform. However, there is seldom a joint decision behind each and every conceptual product variant during development, regarding capability in manufacturing. For example, when considering producibility, some product variants require better tolerances than what the manufacturing processes can deliver. This uncertainty can be reduced, by making producibility analyses of a set of conceptual product variants. By performing several different analyses, knowledge can be gained, and joint decisions can be made about cross product-manufacturing aspects. The activities can be systematically arranged to gradually eliminate unfeasible conceptual product variants. In this paper we show how an integrated PLM architecture can be used to create sufficient knowledge as a basis for joint product and manufacturing decisions. The utmost company benefit of this is to reduce lead-time by taking manufacturing capability into account when developing product families.
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| 2. |
- Mårdberg, Peter, 1980, et al.
(författare)
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A novel tool for optimization and verification of layout and human logistics in digital factories
- 2018
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Ingår i: Procedia CIRP. - : Elsevier BV. - 2212-8271. ; 72, s. 545-550
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Konferensbidrag (refereegranskat)abstract
- We introduce a novel digital factory layout tool that optimizes both the layout of machines and the corresponding ergonomic logistics considering space constraints. A model is constructed by tangible properties on machines and environment, regions on the floor and by ranking their mutual relations. An optimized layout is then computed based on the model, the relations and an ergonomic score for the human work tasks, which are automatically computed by digital manikins. The result is an optimized layout, visualized in 3D, with improved logistic routes. The layout tool has been implemented and successfully tested on a relevant industrial case.
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| 3. |
- Vallhagen, Johan, 1965, et al.
(författare)
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Robustness in aerospace components manufacturing and fabrication – a case study
- 2011
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Ingår i: Proceedings of ISABE2011.
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Konferensbidrag (refereegranskat)abstract
- One approach to light weight designs of jet engine components is to fabricate structures instead of making large complex castings. This needs other methodology to design, plan and verify the joining processes and geometry dimensioning and tolerancing of the parts. This case study has used methods and tools for robust design developed for use in the automotive industry. The purpose of the study was to evaluate the methodology on jet engine components.With virtual geometry models, assembly modeling can be done based on locating schemes, describing the kinematics relations of the assembly. The effect of locator disturbances and part error on critical assembly dimensions can be analyzed with respect to three-dimensional effects. The locating schemes have also been evaluated through a measuring process analyzing the repeatability.The conclusion is that the Robust Design and Tolerancing methodology can be applied to the type of fixturing of joining needed for fabrication of parts in the case study and that great improvements can be made optimising the placement of reference points.
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| 4. |
- Vallhagen, Johan, 1965, et al.
(författare)
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Visual Production – strategic manufacturing system development tools for aerospace industry
- 2011
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Ingår i: Proceedings XX International Symposium on Air Breathing Engines (ISABE), Göteborg 2011. - 9781600868955
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Konferensbidrag (refereegranskat)abstract
- This paper addresses thestrategic development of complexaerospace production systems withan approach based on visualisationtechniques. The core issue is howto manage a large variety ofproduct mixes in different phasesof their life-cycle.Many virtual manufacturingtools are, or can be used. However,there are many gaps in terms ofwhat tasks the tools can support aswell as lack of integration betweendifferent tools. The conclusion isthat they don’t provide a completepicture and decision support.A distinction can be made between1) analytics-based tools fordeterministic system optimization;and 2) combinations of sets ofvisualizations for human expertdecisions combining data that isdifficult to integrate.This paper describes the VisualProduction project. It is based onthe second approach and isdeveloping a demonstrator of thecombination and augmentation of ahigh-precision realistic model ofthe real manufacturing system andadditional simulations andinformation models to increasefidelity and usability of thecombined visualization of themanufacturing situation. Theexpected effects are e.g. increasedefficiency and effectiveness duringdevelopment and increased decisionsupport capability by visualizingdifferent perspectives incollaborative expert teamwork.
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| 5. |
- Berglund, Jonatan, 1983, et al.
(författare)
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Production system geometry assurance using 3D imaging
- 2016
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Ingår i: Procedia CIRP. - : Elsevier BV. - 2212-8271. ; 44, s. 132-137
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Konferensbidrag (refereegranskat)abstract
- Production systems evolve to accommodate new and redesigned products. These changes are planned offline in virtual tools, to reduce disturbances on ongoing production. Offline planning requires virtual models that correctly represent reality. Most models are "as-designed" and suffer from geometrical errors stemming from deployment alterations. Such errors are often discovered late in the next change process or during installation, making corrections expensive. Having geometry assured production systems and models eliminate one source of error during the production system change process. This paper evaluates 3D imaging and the C2M (cloud-to-mesh) algorithm for assessing the validity of virtual production system models.
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| 6. |
- Berglund, Jonatan, 1983, et al.
(författare)
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Using 3D Laser Scanning to Support Discrete Event Simulation of Production Systems: Lessons Learned
- 2015
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Ingår i: Proceedings - Winter Simulation Conference. - 0891-7736. ; 2015-January, s. 2990-2999
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Konferensbidrag (refereegranskat)abstract
- Using 3D laser scanning, the spatial data of an entire production system can be captured and digitalized ina matter of hours. Such spatial data could provide a current state representation of the real systemavailable at the hand of the simulation engineer. The purpose of this paper is to evaluate the use of 3Dlaser scanning in Discrete Event Simulation (DES) projects in the area of production systems. Theevaluation relies on three simulation studies performed with the support of 3D laser scanning. 3D scandata, if available, can support most steps in a DES study. Particularly, the 3D scan data acts as a referencemodel when formulating the conceptual model and collecting input data. During model building the scandata provides physical measurements for accurate positioning of simulation objects. Furthermore the scandata can be used for photorealistic visualization of the simulated environment without requiring any CADmodeling.
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| 7. |
- Li, Jason, 1993, et al.
(författare)
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Evaluation of Photogrammetry for Use in Industrial Production Systems
- 2018
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Ingår i: IEEE International Conference on Automation Science and Engineering. - 2161-8070 .- 2161-8089. ; 2018-August, s. 414-420
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Konferensbidrag (refereegranskat)abstract
- A digital twin of a production system consists of geometric, kinematic and logical models of the physical system. One of the key challenges is to keep the digital twin up-to-date with changes of the real one. Today, laser scanning is the de-facto standard used to keep the geometry of the digital model synchronized. In recent years, advancements in the performance of Graphic Processing Units (GPUs) and the availability of cheap high-resolution digital cameras have made photogrammetry a viable alternative to laser scanning for building digital 3D-models. In this study, we investigate how photogrammetry competes against laser-scanning by comparing their results in form of point-clouds.
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| 8. |
- Lindskog, Erik, 1988, et al.
(författare)
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Combining Point Cloud Technologies with Discrete Event Simulation
- 2012
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Ingår i: Proceedings - Winter Simulation Conference. - 0891-7736.
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Konferensbidrag (refereegranskat)abstract
- Utilizing point cloud models from 3D laser scans for visualization of manufacturing facilities and systemsprovides highly realistic representations. Recent developments has improved the accuracy of point cloudmodels in terms of color and positioning. This technology has the potential to generate savings in timeand money compared to traditional methods. Visualization in terms of accurate geometrical factory datahas traditionally not been feasible when developing discrete event simulation (DES) models. Currently,methods for utilizing point clouds in DES models are lacking. Better visualization could improve communicationof results and make them available to a wider target audience. Creating methods to combinepoint cloud technologies with DES would enable realistic visualization and improved accuracy includinglevel of detail regarding geometric representation in DES models.
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| 9. |
- Lindskog, Erik, 1988, et al.
(författare)
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Improving lean design of production systems by visualization support
- 2016
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Ingår i: Procedia CIRP. - : Elsevier BV. - 2212-8271. ; 41, s. 602-607
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Konferensbidrag (refereegranskat)abstract
- The design process of production systems is complex with many different aspects to consider for efficiently developing and installing an effective system. Important success factors during the design process are typically the abilities to identify and manage risks, develop mitigation plans, and conduct timely proactive problem solving. The work reported in this paper is part of research addressing methods for how the design process can be supported by using virtual representations of the factory environments captured with 3D laser scanning. This support is evaluated in an industrial study of one industrialization project in the manufacturing industry. The industrialization project follows the process to design layout, work places, and plan for installation of new equipment to create a production system within a refurbished shop floor area. The area will include CNC machining centers, welding stations, product inspection, product cleaning, and material handling. 3D laser scanning is used to provide an accurate and realistic virtual representation of the current shop floor area. This virtual representation is combined with 3D CAD models of the new machining centers and other equipment to provide a realistic visualization of the planned production system. The research approach and its questions investigate the benefits of combining the lean principles to design and development of production systems using a realistic visualization, which include systematic risk analysis and problem solving as important activities. The result shows that visualization support gave a great advantage to identify the possible risks and problems, which resulted in higher confidence and substantial timesaving in planning and execution of the industrialization project.
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| 10. |
- Lindskog, Erik, 1988, et al.
(författare)
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Layout Planning and Geometry Analysis Using 3D Laser Scanning in Production System Redesign
- 2016
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Ingår i: Procedia CIRP. - : Elsevier BV. - 2212-8271. ; 44, s. 126-131
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Konferensbidrag (refereegranskat)abstract
- Production system layouts are traditionally redesigned and modelled using CAD tools. Frequent system changes, i.e. equipment is replaced or moved to new locations, necessitate time-consuming measurement and modelling work to keep the models valid and up-to-date. 3D imaging has been proposed as a means for rapid and accurate spatial modelling by digitalising real world objects. This paper analyses the method and result from five industrial studies where 3D imaging, specifically 3D laser scanning, were used to support layout planning and geometry analysis of production systems. The results show promise to reduce time, risks, and cost when redesigning production systems.
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