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Beim Vortrag wurden Inhalte sowie Teilergebnisse der beiden Projekte ""CrashTex"" und ""CrashTex-II"" vorgestellt, die innerhalb des Leistungszentrums Smart Production durchgeführt worden sind. Das Ziel von CrashTex bestand darin Crash-Wirkprinzipien für Faserverbundmaterialien zu konzipieren, diese rechentechnisch sowie experimentell zu untersuchen und für eine Anwendung in PKW-Crashstrukturen zu optimieren. Diese Wirkprinzipien sollen auf einem ähnlichen Niveau wie Metall-Lösungen Crash-Energie aufnehmen und zugleich höhere Leichtbaugrade ermöglichen. Die Ergebnisse der Fraunhofer Untersuchungen zeigen hohe spezifische Energieabsorptionswerte (SEA-Werte) für CFK bei ausgewählten Crash-Wirkmechanismen und Lagenaufbau. Diese SEA-Werte übertreffen deutlich die Werte für Aluminium und ermöglichen somit höhere Leichtbaugrade bei zukünftigen Fahrzeug-Crash-Strukturen durch eine faserverbundgerechte Crash-Funktion. Somit wird der Bezug zum Cluster "Materials" des Leistungszentrums "Smart Production" geschaffen. Das Ziel des Vorhabens CrashTex-II besteht in der Gestaltung und Auslegung neuartiger Dachrahmen-, B-Säulen- und Schwellerstrukturen in hybrider Leichtbauweise, bestehend aus metallischer Hülle und innerer Faserverbundstruktur. Neben höheren Leichtbaugraden soll mit der neuen Bauweise auch eine verbesserte Adaptionsfähigkeit bezüglich verschiedener Fahrzeug- und Motorisierungsvarianten ermöglicht werden. Die konzipierten hybriden Seitenrahmenstrukturen ermöglichen höhere Leichtbaugrade bei zukünftigen Fahrzeug-Crash-Strukturen durch eine faserverbundgerechte Crash-Funktion. Somit wird auch hier der Bezug zum Cluster "Materials" des Leistungszentrums "Smart Production" geschaffen.

The acoustical impact of silencers is restricted by the influence of structure-borne sound. Thereby, excitation and radiation of structure-borne sound play an important role, as well as its transmission along the silencer system. In the design process of a silencer the influence of structure-borne sound on the damping effect is mostly considered by empirical estimations, which can cause an oversized construction. For calculating structure-borne sound in maritime silencers with their typical large dimensions, the application of statistical methods is a possible problem-solving approach. In this contribution, a new simulation and optimization tool is presented, considering the decreased damping effect of silencers due to structure-borne sound. The tool is based on Statistical Energy Analysis (SEA). Results of analytical and experimental SEA are compared. These results were obtained on downscaled silencers and have been transferred to real maritime silencers. Especially the SEA-parameters loss factor and coupling loss factor, airborne and structure-borne sound energies and the number of relevant modes are considered. Based on the measured damping of a silencer compared with numerical and statistical calculations, the capability for optimizing the design process of large silencers is shown.

BigDataOcean - Exploiting Oceans of Data for Maritime Applications @EU Project Networking session of the 14th Extended Semantic Web Conference (ESWC'17)

In this contribution we concentrate on the detection and quantitative characterization of casting defects at the surface as well as in the near-surface and the bulk area. For ultrasonic inspection of the bulk material we employ mechanized scanning and defect reconstruction using the Synthetic Aperture Focusing Technique (SAFT). For the near-surface inspection we consider eddy current techniques to identify open or covered defects. Visual surface inspection based on optical systems and image processing complements our multi-sensor approach.

Specimens of bottom-feeding dabs (Limanda limanda) were caught at several sites in the North Sea and English Channel. DNA was isolated from their livers and analysed by 32P-postlabelling using butanol extraction or nuclease P1 digestion to enhance sensitivity. From South West Patch (North Sea), 5/12 samples showed evidence of adducts with chromatographic properties on PEI-cellulose tic plates similar to those of adducts formed by aromatic carcinogens. Areas of radioactivity were also observed on chromatograms of 2/6 samples from Sylt I (North Sea). In contrast, 6 DNA samples from fish caught in the Channel showed no evidence of adducts. Liver DNA samples from sole (Solea sp.) from another site, Liverpool Bay, exhibited areas of radioactivity which were not evident in samples from a less-polluted area. Sea water from several sites war pumped through XAD resin columns; retained material was eluted with acetone and tested in the sublethal hydroids bioassay for the presence of toxic microc ontaminants. Only the samples from Liverpool Bay showed significant toxic effects. Supported, in parts, by a grant from the European Science Foundation.