@inbook{18080, author = {{Aßmann, S. and Meister, Dorothee M. and Pielsticker, A.}}, booktitle = {{School`s out? Informelle und formelle Medienbildung }}, editor = {{Aßmann, S. and Meister, Dorothee M. and Pielsticker, A.}}, pages = {{7 -- 10}}, publisher = {{kopaed}}, title = {{{School’s out? Informelle und formelle Medienbildung}}}, year = {{2014}}, } @article{1858, author = {{Jacob, Riko and W. Richa, Andrea and Scheideler, Christian and Schmid, Stefan and Täubig, Hanjo}}, journal = {{J. ACM}}, number = {{6}}, pages = {{36:1----36:26}}, title = {{{SKIP*: A Self-Stabilizing Skip Graph}}}, doi = {{10.1145/2629695}}, year = {{2014}}, } @inproceedings{1863, author = {{Derakhshandeh, Zahra and Dolev, Shlomi and Gmyr, Robert and W. Richa, Andrea and Scheideler, Christian and Strothmann, Thim Frederik}}, booktitle = {{26th ACM Symposium on Parallelism in Algorithms and Architectures, SPAA'14, Prague, Czech Republic - June 23 - 25, 2014}}, isbn = {{978-1-4503-2821-0}}, pages = {{220----222}}, publisher = {{ACM}}, title = {{{Brief announcement: amoebot - a new model for programmable matter}}}, doi = {{10.1145/2612669.2612712}}, year = {{2014}}, } @inproceedings{22176, abstract = {{One barrier of laser sintering (LS) to become the main process for Direct Manufacturing (DM) is the surface quality of LS parts. Hence, the property which has to be improved is the rough surfaces of LS parts due to the layered structure. Another additional effect is the incomplete melting of powder particles on the surface due to the high process temperature. In this paper we demonstrate our approach of a theoretical model for the topography of LS part surfaces. We investigated the surface roughness as a function of surface orientation. Considering that the model involves further variables as layer thickness, particle density and particle size distribution to describe the topography precisely. Experimental results were used to optimize and check the results of the model.}}, author = {{Delfs, Patrick and Herale, A.A. and Li, Z. and Schmid, Hans-Joachim}}, booktitle = {{25th Annual International Solid Freeform Fabrication Symposium}}, pages = {{1250--1258}}, title = {{{Simulation of the Surface Topography on Laser Sintered Polymer Parts}}}, doi = {{http://utw10945.utweb.utexas.edu/sites/default/files/2014-098-Delfs.pdf}}, volume = {{25}}, year = {{2014}}, } @inproceedings{22177, abstract = {{An uneven temperature distribution and varying cooling rates at different positions within the part cake are two of the most important challenges regarding the part quality and reproducibility of the polymer laser sintering process. In the presented work, a temperature measurement system is implemented within an EOSINT P395 laser sintering system. It allows the determination of a three dimensional temperature distribution and history during the full build and cooling process. The influence of important job parameters, for example the packing density, job height and layer thickness, can be figured out. In combination with a finite element simulation of the cooling process, the temperature measurement will be the basis for optimized process controls.}}, author = {{Josupeit, Stefan and Schmid, Hans-Joachim}}, booktitle = {{25th Annual International Solid Freeform Fabrication Symposium}}, pages = {{49--58}}, title = {{{Three-dimensional in-process temperature measurement of laser sintered part cakes}}}, doi = {{http://utw10945.utweb.utexas.edu/sites/default/files/2014-006-Josupeit.pdf}}, volume = {{25}}, year = {{2014}}, } @inproceedings{22184, abstract = {{Polymer laser sintering is one of the most important additive manufacturing technologies for the tool-less production of three-dimensional prototypes and end-use parts. In this process, parts are manufactured layerwise out of a polymer powder by laser exposure. After the building process, these parts are located within a loose bulk powder cake. Due to long process times and high process temperatures, this powder ages thermally, which reduces the recyclability of the material. As a result, mixtures of used and virgin powder ("refreshed" powder) with a mixture ratio of approximately 50% are commonly used in the industry. The goal of this work is to determine the exact influence of different powder ages on resulting part quality characteristics, especially the mechanical behavior and the surface quality. Therefore, refreshed powder with different qualities adjusted by the melt volume rate (MVR) was processed along a defined process quality chain. To analyze the part qualities, mechanical tensile and profilometer tests were performed. The focus is on an application-oriented test set-up to ensure the usability of the results in the industry. The material used is polyamide 12 (PA 2200) processed on an EOSINT P395 laser sintering system from EOS GmbH, Krailling, Germany.}}, author = {{Josupeit, Stefan and Rüsenberg, Stefan and Rupp, N. and Gessler, Monika and Schmid, Hans-Joachim}}, booktitle = {{72nd Annual Technical Conference of the Society of Plastics Engineers (ANTEC 2014)}}, isbn = {{978-1-634-39708-7}}, number = {{3}}, pages = {{2383--2385}}, title = {{{Thermal ageing of polyamide 12 used for polymer laser sintering - influence on part quality characteristics}}}, doi = {{https://www.researchgate.net/publication/283135483_Thermal_ageing_of_polyamide_12_used_for_polymer_laser_sintering_-_Influence_on_part_quality_characteristics}}, volume = {{72}}, year = {{2014}}, } @inproceedings{22193, abstract = {{The process-related occurrence of varying cooling rates at different positions within the part cake is an important challenge regarding the part quality and reproducibility of the polymer laser sintering process. Temperature history dependent parameters are for example the part warpage, the crystallization behavior or powder ageing effects, which have to be considered for optimized process controls. Nevertheless, the inner temperature distribution and history during the cooling process is difficult to measure and less known yet. In this work, a Finite Element (FE) model is developed to understand and predict the temperature distribution and history within the part cake during the cooling process. Therefore, the thermal boundary conditions of a laser sintering system are analyzed and relevant parameters are identified. A basic FE model is set up in ABAQUS CAE software considering a part-free powder cake. Important thermal parameters of the bulk powder and the environment are adjusted and verified in relation to experimental in-process measured data. With this model it is possible to predict position-dependent cooling rates as a function of significant job parameters, for example the job height or the environmental conditions during the cooling phase. In combination with extended in-process temperature measurements and a consideration of built parts, this model will be an important tool for the development of optimized process controls.}}, author = {{Josupeit, Stefan and Ordia, L. and Schmid, Hans-Joachim}}, booktitle = {{International Conference on Additive Technologies}}, isbn = {{978-961-281-579-0}}, pages = {{222--227}}, title = {{{Development of a Basic Model to Simulate the Laser Sintering Cooling Process}}}, doi = {{https://www.researchgate.net/profile/Saeed_Khademzadeh2/publication/303022441_Geometrical_characterization_of_thin_walls_produced_by_micro_laser_sintering/links/5735cc7f08ae298602e08f1f/Geometrical-characterization-of-thin-walls-produced-by-micro-laser-sintering.pdf}}, volume = {{5}}, year = {{2014}}, } @inproceedings{22203, abstract = {{One barrier of laser sintering (LS) to become the main process for Direct Manufacturing (DM) is the surface quality of LS parts. Hence, the property which has to be improved is the rough surfaces of LS parts due to the layered structure. Another additional effect is the incomplete melting of powder particles on the surface due to the high process temperature. In this paper we demonstrate our approach of a theoretical model for the topography of LS part surfaces. We investigated the surface roughness as a function of surface orientation. Considering that the model involves further variables as layer thickness, particle density and particle size distribution to describe the topography precisely. Experimental results were used to optimize and check the results of the model.}}, author = {{Delfs, Patrick and Schmid, Hans-Joachim}}, booktitle = {{25th Annual International Solid Freeform Fabrication Symposium}}, pages = {{1250--1258}}, title = {{{Simulation of the Surface Topography on Laser Sintered Polymer Parts}}}, doi = {{http://utw10945.utweb.utexas.edu/sites/default/files/2014-098-Delfs.pdf}}, volume = {{25}}, year = {{2014}}, } @inproceedings{22382, author = {{Adam, Guido and Zimmer, Detmar}}, booktitle = {{ASPE - Spring topical meeting 2014}}, title = {{{Extension of prior developed design rules (LS)}}}, doi = {{https://www.researchgate.net/publication/274193378_Extension_of_prior_developed_design_rules%27_range_of_validity_for_different_boundary_conditions_in_laser_sintering }}, year = {{2014}}, } @inproceedings{22383, author = {{Adam, Guido and Zimmer, Detmar}}, title = {{{Systematic investigations of minimum feature sizes and geometrical accuracies}}}, year = {{2014}}, } @article{22384, abstract = {{Additive Manufacturing technologies create parts layer by layer. Thereby, lots of benefits are offered. Especially extended design freedoms provide new potentials for the design of technical parts. To make these benefits accessible to different user groups, design rules for Additive Manufacturing were developed within the project ‘‘Direct Manufacturing Design Rules’’. Therefore a process independent method was defined first. Next, design rules were developed for Laser Sintering, Laser Melting and Fused Deposition Modeling. The results were summarized in a design rule catalog and support a suitable design for Additive Manufacturing }}, author = {{Adam, Guido and Zimmer, Detmar}}, journal = {{CIRP Journal of Manufacturing Science and Technology}}, number = {{1}}, pages = {{20--28}}, title = {{{Design for Additive Manufacturing - Element transitions and aggregated structures}}}, doi = {{10.1016/j.cirpj.2013.10.001 }}, volume = {{7}}, year = {{2014}}, } @inproceedings{22385, author = {{Adam, Guido}}, title = {{{Erweiterung des Gültigkeitsbereichs von Konstruktionsregeln beim Lasersintern}}}, year = {{2014}}, } @inproceedings{22386, author = {{Adam, Guido}}, title = {{{Extension of prior developed design rules for laser sintering}}}, year = {{2014}}, } @inproceedings{22387, author = {{Lessmeier, Christian and Enge-Rosenblatt, Olaf and Bayer, Christian and Zimmer, Detmar}}, booktitle = {{European Conference of the PHM Society 2014 (EPHM14)}}, isbn = {{978-1-936263-16-5}}, publisher = {{Prognostics and Health Management Society }}, title = {{{Data Acquisition and Signal Analysis from Measured Motor Currents for Defect Detection in Electromechanical Drive Systems}}}, year = {{2014}}, } @article{22388, author = {{Klause, Alexander and Zimmer, Detmar}}, isbn = {{978-3-944331-67-6}}, journal = {{Entwerfen - Entwickeln - Erleben 2014. Beiträge zur virtuellen Produktentwicklung und Konstruktionstechnik}}, pages = {{619--639}}, publisher = {{TUDpress Verlag der Wissenschaften GmbH}}, title = {{{Auswahl anwendungsoptimaler Antriebssysteme als Basis für die Komposition von Antriebsbaukästen}}}, year = {{2014}}, } @inproceedings{22389, author = {{Strop, Malte and Hölscher, Christian and Zimmer, Detmar}}, booktitle = {{OPT-i 2014. 1st International Conference on Engineering and Applied Sciences Optimization}}, isbn = {{978-960-99994-6-5}}, pages = {{626--663}}, publisher = {{Institute of Structural Analyses and Antiseismic Research}}, title = {{{Intelligent Operating Strategies for Multi-Motor Drive Systems}}}, volume = {{1}}, year = {{2014}}, } @article{22390, author = {{Zimmer, Detmar and Hölscher, Christian and Strop, Malte}}, isbn = {{1613-5504}}, journal = {{Newsletter der Wissenschaftlichen Gesellschaft für Produktentwicklung }}, pages = {{7--9}}, publisher = {{Wissenschaftliche Gesellschaft für Produktentwicklung WiGeP}}, title = {{{Intelligente Betriebsstrategien für Mehrmotorenantriebssysteme}}}, doi = {{http://wigep.de/fileadmin/download/wigep/WiGeP_News_2014_1.pdf}}, volume = {{1}}, year = {{2014}}, } @article{22391, author = {{Klause, Alexander and Zimmer, Detmar}}, isbn = {{0373-3300}}, journal = {{Konstruktion - Zeitschrift für Produktentwicklung und Ingenieur-Werkstoffe }}, number = {{5}}, pages = {{61&66}}, publisher = {{Springer-VDI-Verlag }}, title = {{{Konzeption von Antriebssystembaukästen auf der Basis von branchenspezifischen Antriebslösungen}}}, volume = {{66}}, year = {{2014}}, } @book{22392, author = {{Hölscher, Christian and Zimmer, Detmar}}, isbn = {{978-3-642-45434-9}}, pages = {{33--36}}, publisher = {{Springer Verlag (Lecture Notes in Mechanical Engineering)}}, title = {{{intelligent Drive Module (iDM)}}}, doi = {{10.1007/978-3-642-45435-6}}, year = {{2014}}, } @book{22393, author = {{Hölscher, Christian and Keßler, Jan Henning and Meyer, Tobias and Rasche, Christoph and Reinold, Peter and Sextro, Walter}}, isbn = {{978-3-642-53741-7}}, pages = {{16--21}}, publisher = {{Springer Verlag (Lecture Notes in Mechanical Engineering)}}, title = {{{Application of Self-optimizing Systems}}}, doi = {{10.1007/978-3-642-53742-4}}, year = {{2014}}, }