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| 2. |
- Stark, Andreas, et al.
(author)
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Hybrid digital manufacturing: Capturing the value of digitalization
- 2023
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In: Journal of Operations Management. - : Wiley. - 1873-1317 .- 0272-6963. ; 69:6, s. 890-910
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Journal article (peer-reviewed)abstract
- A chasm is growing between the advanced technologies available for improving manufacturing operations and those effectively used in practice. The vision of Industry 4.0 is to mobilize industry to seek out these possibilities for improvement and to close the gap between opportunity and reality. However, when compared with more established improvement opportunities such as lean manufacturing, the digitalization of manufacturing lacks in both paradigmatic examples and an understanding of how to achieve the benefits. This lack is a complication of concern: Without an appropriate operations strategy to capture the value of digitalization, manufacturing companies will be unable to focus on technological investments and operational changes. To address this concern, operations management academics must develop new theory through active engagement in the practice of digitalization in manufacturing. This research presents a paradigmatic example, based on engaged scholarship, focused on effectively combining novel object-interactive and conventional manufacturing syntax for benefiting from digitalization in internal operations and the wider supply chain. The contribution to literature is a novel operations strategy—hybrid digital manufacturing—for capturing the value of Industry 4.0 technologies.
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| 3. |
- Johansson, Göran, 1975, et al.
(author)
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Computational modeling of inelastic large ratcheting strains
- 2005
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In: International Journal of Plasticity. ; 21:5, s. 955-980
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Journal article (peer-reviewed)abstract
- A framework forphenomenological hyperelasto-plasticity with initial anisotropy,kinematic hardening as well as anisotropic damage is presented inMenzel et al. (2003a).In this contribution we exploit and extend this framework toinclude several back-stresses in order to capture the ratchettingresponse of polycrystalline metals subjected to cyclic stress withnon-zero mid-value. The evolution equations for kinematichardening resemble a linear combination of the multiple-Armstrong-Frederic and the Burlet-Cailletaudmodels, which are extended to the large strain setting. Thecapability of the model to capture various phenomenologicalcharacteristics, in particular multi-axial ratchetting, isillustrated by numerical examples. Comparisons with uni-axial andbi-axial experimental ratchetting results for carbon steel aregiven. Finally, the finite element analysis of a simplifiedrailway turnout component subjected to cyclic loading ispresented.
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| 4. |
- Johansson, Håkan, 1979, et al.
(author)
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Parameter identification for constitutive models with error control
- 2004
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In: ECCOMAS 2004, European Congress on Computational Methods in Applied Sciences and Engineering. - 9513918688
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Conference paper (other academic/artistic)abstract
- A recently proposed technique for the calibration ofconstitutive models, that is based on optimization with built-in error control, is applied to Norton's viscoelasticity model. In order to focus on the characteristic features, only the constitutive response for uniaxial stress is considered; however, the extension to multiaxial states and spatially non-homogeneous situations is quite straightforward although technically more complex. Essentially, the optimization strategy is based onNewton's method and consists of solving three linear problems running forwards in time and one linear problem (for the costate) running backwards in time. It is interesting to note that the same problem character is pertinent to the solution of the dual problem, which is the basis for the a posteriori error computation.
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| 5. |
- Luhrig, Katharina, et al.
(author)
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Bacterial Community Analysis of Drinking Water Biofilms in Southern Sweden
- 2015
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In: Microbes and Environments. - 1342-6311. ; 30:1, s. 99-107
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Journal article (peer-reviewed)abstract
- Next-generation sequencing of the V1-V2 and V3 variable regions of the 16S rRNA gene generated a total of 674,116 reads that described six distinct bacterial biofilm communities from both water meters and pipes. A high degree of reproducibility was demonstrated for the experimental and analytical work-flow by analyzing the communities present in parallel water meters, the rare occurrence of biological replicates within a working drinking water distribution system. The communities observed in water meters from households that did not complain about their drinking water were defined by sequences representing Proteobacteria (82-87%), with 22-40% of all sequences being classified as Sphingomonadaceae. However, a water meter biofilm community from a household with consumer reports of red water and flowing water containing elevated levels of iron and manganese had fewer sequences representing Proteobacteria (44%); only 0.6% of all sequences were classified as Sphingomonadaceae; and, in contrast to the other water meter communities, markedly more sequences represented Nitrospira and Pedomicrobium. The biofilm communities in pipes were distinct from those in water meters, and contained sequences that were identified as Mycobacterium, Nocardia, Desulfovibrio, and Sulfuricurvum. The approach employed in the present study resolved the bacterial diversity present in these biofilm communities as well as the differences that occurred in biofilms within a single distribution system, and suggests that next-generation sequencing of 16S rRNA amplicons can show changes in bacterial biofilm communities associated with different water qualities.
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| 7. |
- Frogner, Kenneth, et al.
(author)
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Induction heating of carbon fiber structures - properties and challenges
- 2014
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In: [Host publication title missing].
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Conference paper (peer-reviewed)abstract
- Carbon fiber reinforced plastic is constantly gaining market shares due to its unique properties. By heating this kind of materials using induction, many new applications occur. The high resistivity and anisotropic properties of carbon fiber composites means there are a number of challenges to overcome. This work emphasizes the key components related to induction heating of complex materials and present ways to characterize the important properties using non-contact methods. Successful experimental results are presented and the work also shows very good agreement between measurements and simulations.
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| 8. |
- Hedekvist, Per Olof E, 1967, et al.
(author)
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Accurate time transfer utilizing the synchronization in an SDH-network
- 2006
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In: 2006 Optical Fiber Communication Conference, and the 2006 National Fiber Optic Engineers Conference; Anaheim, CA; United States; 5 March 2006 through 10 March 2006. - 9781557528032
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Conference paper (peer-reviewed)abstract
- A nationwide system for accurate time distribution is being developed, utilizing synchronization in an SDH-network. The first experimental results based on this technique are presented, performed on, but not limited to, STM-64.
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| 9. |
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| 10. |
- Johansson, Håkan, 1979, et al.
(author)
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Calibration of a Nonlinear Elastic Composite with Goal-Oriented Error Control Using a Sub-Scale Modeling Approach
- 2004
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In: Proc. of Second International Conference on Multiscale Materials Modeling, MMM-2, October 11-15, 2004. ; 1:1, s. 466-468
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Conference paper (other academic/artistic)abstract
- A recently proposed technique for the calibration of constitutive models is based on the optimization problem expressed such that the state equation is incorporated via an additional costate field. A distinct advantage is that error control is formally straightforward. This technique is applied to calibration of a nonlinear elastic composite using a meso-macro-transition approach, whereby the RVE is analyzed using (in this case) Dirichlet boundary conditions. The numerical results show the effectivity of the error prediction.
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