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- Dahlquist, Håkan, et al.
(author)
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En samhällsekonomisk utvärdering av Verköprojektet
- 1998
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Reports (other academic/artistic)abstract
- Rapporten omfattar en samhällsekonomisk bedömning av Karlskrona kommuns investering i en ny färjeterminal på Verkö. Bedömningen har gjorts med hjälp av en av författarna konstruerad modell för att beräkna konsumenternas betalningsvilja för en färjeförbindelse mellan Karlskrona och Gdynia. Rapporten inbegriper en samhällsekonomisk, företagsekonomisk och kommunalekonomisk kalkyl över färjeförbindelsen och investeringen, samt de fördelningseffekter som detta medför.
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- Lindberg, C. -F, et al.
(author)
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A pulp and paper simulator for operator training and process optimization
- 2015
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In: European Control Conference, ECC 1999 - Conference Proceedings. - : Institute of Electrical and Electronics Engineers Inc.. - 9783952417355 ; , s. 1196-1200
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Conference paper (peer-reviewed)abstract
- A new dynamic simulator for pulp and paper applications has been developed. The simulator is useful for process optimization and operator training, especially when constructing a new paper machine, or rebuilding an existing one, or introducing new employees. The main advantage of the simulator is that the same control system (Distributed Control System source code) and the same displays in the Operator stations are used in the simulator as in the real plant. In this way process operators get very realistic training of various events. Optimization of an existing process line can be done by testing different ways of operation, and then selecting the best way of operation. A suitable rebuild of an existing mill could be found in a similar manner, i.e. by simulating different rebuild possibilities. A DCS functionality checkout can be done before startup of a real mill, since identical DCS code is used in the simulator as in the real mill.
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- Wallin, Fredrik, et al.
(author)
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Dynamic simulators for process control and optimization as well as for operator training in pulp and paper industry
- 2002
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In: Proceedings of the 43rd Conference on Simulation and Modelling. - 9525183181
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Conference paper (pop. science, debate, etc.)abstract
- By using a dynamic physical model, that is adapted to real process data, robust mathematical process models can be created. By doing this it is possible to build in process know how from many different sources, and also to include factors, that are not easy to measure. From the dynamic model a training simulator can be made. From the dynamic model it may also be possible to do a model reduction to get an MPC, a Model Predictive Control. Data reconciliation is needed, to keep control of the measurements of all kind. A decision support system keeps control over the process status, to support operators. The production is also optimized at several levels. These functions may also be achieved by using principally the same mathematical models and algorithms.
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- Werke, Mats, et al.
(author)
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Minimising machining distortions with support from adaptive fixtures and adjustment of the NC-code
- 2020
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Reports (other academic/artistic)abstract
- The aim was to develop and test an adaptive fixture concept with a modified hydraulic chuck from System 3R. The conclusion is that the chuck may be a good concept for adjusting machining distortions but further development is recommended. Further, a literature survey concerning responsive fixtures for CNC-machining is presented. In addition, a virtual approach for compensation of machining distortions was tested. A framework of LS-Dyna algorithms for springback compensation after sheet metal forming was tested on a use case. The study indicates that the concept can be applied for NC-code optimisation on solid geometries with a complex manufacturing process chain composed of e.g. forging, heat treatment and proceeding machining processes. The deformations after machining were notably reduced in this numerical survey. Also virtual concepts for calculation of material removal strategies and clamping force analysis is suggested and demonstrated. The project was carried out with the support of physical experiments with an adaptive fixture and simulation with FEM based on the contour method.
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