@inproceedings{23680, author = {{Vaßholz, Mareen and Gräßler, Iris}}, booktitle = {{Proceedings of the DESIGN 2014, 13th International DESIGN Conference, Band 2}}, pages = {{407--416}}, title = {{{Early Analysis of the System Dynamics of Self-Optimizing Systems}}}, volume = {{2}}, year = {{2014}}, } @inproceedings{23681, author = {{Gräßler, Iris}}, booktitle = {{Proceedings of ECEC 2014, 21st European Concurrent Engineering Conference}}, pages = {{39--44}}, title = {{{Principles of Agile Systems Engineering}}}, year = {{2014}}, } @inproceedings{23682, abstract = {{Current production control systems cannot react appropriately to unknown situations (e.g. the dispatch of rush jobs). They are only able to react on known situations with a predefined behaviour. In this paper the paradigm of self-optimisation will be transferred to the production control level by using a procedure model to design a self-optimising production control system. The production control is then able to react autonomously on changing operational conditions and to deduce new reaction strategies for occurring faults or disturbances. A rule based decision model is the core of the conceptual design. It is based on known and possible future faults and deducts reaction strategies. Simultaneously to them, a simulation model will be proposed, that simulates and evaluates suitable strategies.}}, author = {{Mittag, Tobias and Gausemeier, Jürgen and Gräßler, Iris and Iwanek, Peter and Köchling, Daniel and Petersen, Marcus}}, booktitle = {{Disruptive Innovation in Manufacturing Engineering towards the 4th Industrial Revolution: mit CD-ROM - Proceedings of the 8th International CIRP Conference on Digital Enterprise Technology - DET 2014, International CIRP Conference on Digital Enterprise Technology (DET), Nr. 8}}, isbn = {{978-3-839606-97-1}}, publisher = {{Fraunhofer-Institut für Arbeitswirtschaft und Organisation (IAO), Fraunhofer Verlag}}, title = {{{Conceptual Design of a Self-Optimising Production Control System}}}, volume = {{8}}, year = {{2014}}, } @article{23688, abstract = {{Anhand von Forschungsergebnissen aus dem Sonderforschungsbereich Transregio 30 wird dargestellt, wie Verbunde aus eigenverstärkten teilkristallinen oder hochgereckten amorphen Folien und Gewebe für Leichtbauanwendungen hergestellt und welche Eigenschaften erreicht werden können. Eine lokal differenzielle, thermo-mechanische Prozessführung ist sehr effizient variierbar, und somit lassen sich gradierte Eigenschaften im Sinne einer Funktionalisierung einstellen. }}, author = {{Heim, Hans-Peter and Ries, Angela and Schöppner, Volker and Wibbeke, Andrea and Turek, Stefan and Damanik, Hogenrich and Mahnken, Rolf and Dammann, Christian and Wünsch, Olaf and Al-Baldawi, Ammar and Rohde, Björn and Brückner-Foit, Angelika and Gausemeier, Jürgen and Gräßler, Iris and Petersen, Marcus}}, issn = {{0023-5563}}, journal = {{Kunststoffe 104 (3/2014)}}, pages = {{72--78}}, title = {{{Eigenverstärkte Thermoplastverbunde - Verbundwerkstoffe (Teil 2)}}}, year = {{2014}}, } @article{23690, abstract = {{Anhand von Forschungsergebnissen aus dem Sonderforschungsbereich Transregio 30 wird dargestellt, wie Verbunde aus eigenverstärkten teilkristallinen oder hochgereckten amorphen Folien und Gewebe für Leichtbauanwendungen hergestellt und welche Eigenschaften erreicht werden können. Eine lokal differenzielle, thermo-mechanische Prozessführung ist sehr effizient variierbar, und somit lassen sich gradierte Eigenschaften im Sinne einer Funktionalisierung einstellen.}}, author = {{Heim, Hans-Peter and Ries, Angela and Schöppner, Volker and Wibbeke, Andrea and Turek, Stefan and Damanik, Hogenrich and Mahnken, Rolf and Dammann, Christian and Wünsch, Olaf and Al-Baldawi, Ammar and Rohde, Björn and Brückner-Foit, Angelika and Gausemeier, Jürgen and Gräßler, Iris and Petersen, Marcus}}, journal = {{Kunststoffe international 104 (3/2014)}}, pages = {{41--46}}, title = {{{Self-Reinforced Thermoplastic Composites - Composite Materials (Part 2)}}}, year = {{2014}}, } @article{23691, abstract = {{Mit eigenverstärkten Thermoplasten ist es möglich, Verbundsysteme herzustellen, die im Unterschied zu klassischen Faserverbundwerkstoffen keine Fremdfasern zur Verstärkung enthalten. Stattdessen werden thermoplastische Fasern oder Bändchen z.B. aus PP oder PE in einer identischen Matrix eingesetzt. Damit eröffnet sich ein hohes Leichtbaupotenzial bei gleichzeitig sehr guter Rezyklierbarkeit.}}, author = {{Heim, Hans-Peter and Ries, Angela and Schöppner, Volker and Wibbeke, Andrea and Turek, Stefan and Damanik, Hogenrich and Mahnken, Rolf and Dammann, Christian and Wünsch, Olaf and Al-Baldawi, Ammar and Rohde, Björn and Brückner-Foit, Angelika and Gausemeier, Jürgen and Gräßler, Iris and Petersen, Marcus}}, journal = {{Kunststoffe international 104 (2/2014)}}, pages = {{31--35}}, title = {{{Self-Reinforced Thermoplastic Composites - Composite Materials (Part 1)}}}, year = {{2014}}, } @article{23692, abstract = {{Mit eigenverstärkten Thermoplasten ist es möglich, Verbundsysteme herzustellen, die im Unterschied zu klassischen Faserverbundwerkstoffen keine Fremdfasern zur Verstärkung enthalten. Stattdessen werden thermoplastische Fasern oder Bändchen z.B. aus PP oder PE in einer identischen Matrix eingesetzt. Damit eröffnet sich ein hohes Leichtbaupotenzial bei gleichzeitig sehr guter Rezyklierbarkeit.}}, author = {{Heim, Hans-Peter and Ries, Angela and Schöppner, Volker and Wibbeke, Andrea and Turek, Stefan and Damanik, Hogenrich and Mahnken, Rolf and Dammann, Christian and Wünsch, Olaf and Al-Baldawi, Ammar and Rohde, Björn and Brückner-Foit, Angelika and Gausemeier, Jürgen and Gräßler, Iris and Petersen, Marcus}}, journal = {{Kunststoffe 104 (2/2014)}}, pages = {{35--39}}, title = {{{Eigenverstärkte Thermoplastverbunde - Verbundwerkstoffe (Teil 1)}}}, year = {{2014}}, } @article{23834, author = {{Hüser, Nicole and Kenig, Eugeny}}, journal = {{Chemical Engineering Transactions}}, pages = {{1417--1422}}, title = {{{A new absorption-desorption pilot plant for CO2 Capture}}}, doi = {{10.3303/CET1439237}}, volume = {{39}}, year = {{2014}}, } @inproceedings{23878, author = {{Hüser, Nicole and Kenig, Eugeny}}, publisher = {{Jahrestreffen der Fachgruppen Extraktion und Fluidverfahrenstechnik}}, title = {{{Konzeption und Validierung einer neuen Technikumsanlage zur Absorption und Desorption von CO2}}}, 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}}, }