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- Bodin, Per, et al.
(author)
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Guidance, navigation, and control experiments on the PRISMA in-orbit test bed
- 2007
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In: 58th International Astronautical Congress, IAC-07-C1. - 9781605601502 ; , s. 4461-4470
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Conference paper (peer-reviewed)abstract
- PRISMA will demonstrate Guidance, Navigation and Control strategies for advanced autonomous formation flying and rendezvous. The Swedish Space Corporation (SSC) is the prime contractor for the project which is funded by the Swedish National Space Board (SNSB). The project is further supported by the German Aerospace Center (DLR), the Technical University of Denmark (DTU), and the French Space Agency (CNES). PRISMA consists of two spacecraft: MAIN and TARGET. The MAIN satellite is 3-axis stabilized and has full 3D delta-V maneuverability that is independent of the spacecraft's attitude. The TARGET satellite has a simplified, yet 3-axis stabilizing, magnetic attitude control system and no orbit maneuver capability. This paper presents the PRISMA Guidance, Navigation, and Control (GNC) subsystem. The paper gives a mission summary and an overview of the GNC subsystem with its hardware and software configuration. It also explains how the orbit control functions contain advanced fuel optimal Model Predictive Control (MPC). It is shown how the GNC software is developed using model based automatic coding technology implemented with Matlab/Simulink. The paper then summarizes the different GNC experiments to be performed by SSC. Finally, an overview of the test approach for the subsystem is given.
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- Persson, Erik, 1972-, et al.
(author)
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Utilization of the natural variation in wood properties–a comparison between pilot plant and mill scale trials
- 2003
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In: Proceedings of International Mechanical Pulping Conference, Quebec City. - 1896742866 ; , s. 83-90
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Conference paper (peer-reviewed)abstract
- Four different pulpwood classes of Norway spruce (Picea abies (L.) Karst). were tested in mill scale production of TMP at Hallsta Papermill. The objectives of the trial were to evaluate both rather extreme and more traditional roundwood classes in a full-scale TMP-plant with respect to pulp properties and energy requirements. The experiment was partly based on the results from the proceeding pilot plant trial within the EuroFiber project. The results generally confirmed the findings in the pilot plant trial. Young wood with a high proportion of juvenile wood gave a pulp with attractive optical properties, but somewhat lower tear index and higher energy consumption. The other extreme, sawmill chips from old trees of heavy dimensions, required lower energy input and gave higher tear index, but inferior optical properties. The two more traditional classes gave pulps with properties between the two extremes.
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| 5. |
- Persson, Erik, et al.
(author)
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Utilization of the natural variations in wood properties in production of TMP : Comparison between pilot plant and mill scale trials using different assortments of Norway spruce pulpwood
- 2003
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In: 2003 International Mechanical Pulping Conference / Pulp and Paper Technical Association of Canada. - Montreal : PAPTAC. - 1896742866 ; , s. 485-
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Conference paper (peer-reviewed)abstract
- International Mechanical Pulping Conference, Québec City Canada x-y June 2003, Persson, Erik., Engstrand, Per, Karlsson, Lennart., Nilsson, Fredrik, Wahlgren, Mikael.
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