@techreport{24669, author = {{Lieneke, Tobias and Künneke, Thomas and Eschner, Niclas and Jacob, Alexander and Schäfer, Martin and Hickmann, Thorsten and Faroun, Rami and Hoffmann, Markus and Scholl, Markus and Baumeister, Kai and Zimmer, Detmar and Lanza, Gisela}}, isbn = {{978-3-00-065337-7}}, title = {{{Kombination und Integration etablierter Technologien mit additiven Fertigungsverfahren}}}, year = {{2020}}, } @phdthesis{22493, abstract = {{Federkraftbremsen für industrielle Anwendungen tragen häufig zur Erfüllung einer Sicherheitsfunktion bei. Um Sicherheitsfunktionen zu validieren, sind Sicherheitskennzahlen einzelner Elemente erforderlich. Für Federkraftbremsen werden diese bis dato nur vereinzelt zur Verfügung gestellt. Weiterhin existiert kein Konsens über deren Ermittlung. In dieser Arbeit wird ein bauteilorientierter Ansatz zur Ermittlung von Sicherheitskennzahlen für Federkraftbremsen diskutiert. Unter Berücksichtigung relevanter rechtlich-normativer Rahmenbedingungen wird eine qualitative Zuverlässigkeitsanalyse durchgeführt. Es folgt die simulative und experimentelle Untersuchung einer konkreten Bauteilschadensart. Abschließend wird ein Zuverlässigkeitsblockdiagramm auf Grundlage gewonnener Erkenntnisse hergeleitet.}}, author = {{Hübner, Christoph}}, isbn = {{978-3-8440-7889-3}}, keywords = {{Federkraftbremsen, Funktionale Sicherheit, Technische Zuverlässigkeit, Verschleiß}}, publisher = {{Shaker Verlag GmbH}}, title = {{{Beitrag zur Bewertung der funktionalen Sicherheit von Federkraftbremsen}}}, year = {{2020}}, } @phdthesis{22501, abstract = {{Elektromechanische Spindelhubantriebe werden in einer Vielzahl von unterschiedlichen Anwendungen mit jeweils spezifischen Prozesskennwerten eingesetzt. Dabei kann es vorkommen, dass das dynamische Betriebsverhalten eines Spindelhubantriebs unerwünschte Schwingungen aufweist. Um unerwünschte Betriebszustände bereits vor dem realen Anwendungsfall ersichtlich zu machen, wird im Rahmen dieser Arbeit ein Simulationsmodell von Spindelhubantrieben mit Trapezgewindespindel entwickelt. Dazu wird zunächst recherchiert, welche Schwingungsphänomene in einem Spindelhubantrieb entstehen können. Die Modellbildung wird durch eine Verifikation anhand der identifizierten Schwingphänomene begleitet. Im Anschluss erfolgt eine Validierung des Simulationsmodells durch experimentelle Messungen. Mittels einer Parameterstudie werden Einflussgrößen von zwei Schwingphänomenen analysiert. Die erzielten Erkenntnisse werden anschließend erfolgreich auf ein zuvor schwingungsanfälliges Antriebssystem zugunsten eines stabilen, dynamischen Betriebsverhaltens übertragen, wodurch die Gültigkeit des Modells nachgewiesen wird.}}, author = {{Tominski, Johannes}}, isbn = {{978-3-8440-7499-4}}, publisher = {{Shaker Verlag GmbH}}, title = {{{Entwurf eines Simulationsmodells zur Beurteilung und Beeinflussung des dynamischen Betriebsverhalten von Spindelhubantrieben mit Trapezgewindespindel}}}, year = {{2020}}, } @article{22006, abstract = {{Simulationsmethoden bieten die Möglichkeit, instabile Betriebszustände von Antriebssystemen noch vor dem Einsatz in einer realen Anwendung zu identifizieren und gezielt Gegenmaßnahmen abzuleiten. In dem vorliegenden Artikel wird die Entwicklung eines Simulationsmodells für elektro- mechanische Spindelhubantriebe beschrieben. Im Fokus der Betrachtung stehen insbesondere reibungsinduzierte Schwingphänomene, die in Schneckengetrieben und Trapezgewindespindeln entstehen können. Das Simulationsmodell wird anhand von experimentellen Messungen für mehrere stabile Betriebspunkte und für einen instabilen Betriebszustand validiert. Eine Diskussion der Ergebnisse schließt den Beitrag ab.}}, author = {{Tominski, J. and Zimmer, Detmar}}, isbn = {{0373-3300}}, journal = {{Konstruktion - Zeitschrift für Produktentwicklung und Ingenieur-Werkstoffe}}, number = {{4}}, pages = {{72--82}}, publisher = {{Springer-VDI-Verlag }}, title = {{{Entwurf eines Simulationsmodells zur Bewertung des Betriebsverhaltens von elektromechanischen Spindelhubantrieben}}}, doi = {{10.37544/0720-5953-2020-04-72 }}, volume = {{72}}, year = {{2020}}, } @inproceedings{34431, abstract = {{In diesem Beitrag werden zuerst die Hauptanforderungen für Schmierstoffe für die E-Mobilität dargestellt. Anschließend wird erklärt, welche technische Herausforderungen aus den sehr unterschiedlichen Anforderungen der einzelnen Komponenten resultieren. Danach wird der Einfluss der Grundölsorte, der Viskosität und der Additivierung diskutiert. Zum Schluss werden die typischen Unverträglichkeiten der eingesetzten Materialien und die damit verbundenen Schadensarten bzw. die Tests zur frühzeitigen Aufklärung, vorgestellt.}}, author = {{Magyar, Balázs and Freise, Rainer}}, booktitle = {{Experten-Forum Powertrain: Reibung in Antrieb und Fahrzeug 2019}}, editor = {{Liebl, Johannes}}, isbn = {{978-3-658-28711-5}}, pages = {{78–88}}, publisher = {{Springer Fachmedien Wiesbaden}}, title = {{{Schmierstoffentwicklung für E-Antriebe: Der Teufel steckt im Detail}}}, doi = {{10.1007/978-3-658-28711-5_8}}, year = {{2020}}, } @article{34435, abstract = {{Radial shaft sealing rings (RSSR) are important machine elements used in rotating and oil lubricated systems. Their main task is to prevent oil from exiting the system and dirt particles from entering the system. When this function is not fulfilled, a leakage can occur and cause excessive damage after certain operating times, such as gear failure due to insufficient lubrication. This is the reason for the high level of current research interest in seals. The sealing function of RSSR occurs in the contact area between the sealing lip and the shaft. The contact takes place over a very small contact width of approximately 1 μm. These extremely small dimensions and the complex relationships between the functional influencing variables on the radial shaft sealing system make it difficult to simulate wear on the sealing ring. The energetic consideration of the wear process offers the possibility of quantifying influencing variables more easily by their energetic contribution, which can be determined experimentally. Based on experimentally measured total friction moments, and with the help of a semi-analytical (SA) solid contact model based on the half-space theory, this paper presents a modelling approach for the calculation of wear at the sealing ring. The model presented in this work differs from the existing models in two ways. The first particularity is the coupling of SA method with finite element method (FEM) for the resolution of the contact between the sealing lip and the shaft, allowing a fine discretization of the contact zone (by SA method) and the consideration of the structural behavior (by FE method). The SA method compared to the commonly used FEM presents a great saving in computation time. The second particularity is the use of the real data obtained during the wear tests. Most existing simulation models are based purely on contact pressure. This means that through the contact pressure obtained by simulation and a given sliding distance value, a friction energy will be estimated which will be used in a next step using a wear model such as Archad’s to calculate the wear rate. In this publication the value of friction energy was obtained directly on an experimental basis and a more appropriate wear law, such as Fleischer’s, taking into account the friction conditions, was used to estimate the wear rate.}}, author = {{Foko Foko, Flavien and Heimes, Julia and Magyar, Balázs and Sauer, Bernd}}, issn = {{2075-4442}}, journal = {{Lubricants}}, number = {{2}}, title = {{{Friction Energy-Based Wear Simulation for Radial Shaft Sealing Ring}}}, doi = {{10.3390/lubricants8020015}}, volume = {{8}}, year = {{2020}}, } @article{34436, abstract = {{Regarding the increasing demand in seal lifetime and energy efficiency, a detailed microscopic simulation is necessary—as an addition to experimental investigations—to better understand and improve radial shaft seals. For this purpose, typically thermoelastohydrodynamic lubrication (TEHL) simulations are used. The published models range from rather simple elastohydrodynamic lubrication (EHL) models to very sophisticated TEHL models. Only very few models take into account the roughness or microstructure of both contact surfaces, though, since this would require the consideration of transient effects. In this article, a transient TEHL model for the contact of radial shaft seals is presented. Studies of the sealing contact are conducted, and the possibility of investigating shaft microstructuring is shown.}}, author = {{Thielen, Stefan and Magyar, Balázs and Sauer, Bernd}}, issn = {{0742-4787}}, journal = {{Journal of Tribology}}, number = {{5}}, title = {{{Thermoelastohydrodynamic Lubrication Simulation of Radial Shaft Sealing Rings}}}, doi = {{10.1115/1.4045802}}, volume = {{142}}, year = {{2020}}, } @article{35193, author = {{Keßler, A and Elkenkamp, P and Magyar, Balázs and Mayer, C}}, issn = {{0724-3472}}, journal = {{Tribologie und Schmierungstechnik}}, number = {{2}}, pages = {{23--28}}, title = {{{Beurteilung der Leistungsfähigkeit von Schmierstoffen mittels eines FZG Prüfstandes}}}, volume = {{67}}, year = {{2020}}, } @inproceedings{22442, abstract = {{Laser Beam Melting (LBM) is an Additive Manufacturing (AM) process on the threshold of serial production. Therefore, LBM has to overcome different problems such as a low productivity and minor economic efficiency. Support structures are essential for LBM; however, these structures contribute to the mentioned topics, because their removal is time consuming and cost intensive. To enable design engineers and operators to increase the efficiency of LBM, design guidelinesfor support structures suitable for post-processing are developed. For this purpose, the effect of different design parameters on various evaluation criteria is considered. Suitability for post-processing can be evaluated in terms of cost, quality and time. Therefore, test specimens are built and parameter impacts on material consumption as well as the post-processing time is examined. Furthermore, the roughness of the parts is analyzed and used as an indicator for the removability of the support structure. In addition, warpage is measured and the impact of the parameters on this criterion is examined. Based on the results, suitable design guidelines and hints for support structures are developed in order to reduce time and costs during manufacturing and post-processing. }}, author = {{Künneke, Thomas and Lieneke, Tobias and Lammers, Stefan and Zimmer, Detmar}}, booktitle = {{Proceedings of the Special Interest Group meeting on Advancing Precision in Additive Manufacturing}}, pages = {{137--140}}, title = {{{Design guidelines for post-processing of laser beam melting in context of support structures}}}, doi = {{https://www.euspen.eu/knowledge-base/AM19127.pdf}}, year = {{2019}}, } @inproceedings{22443, abstract = {{Additive Manufacturing (AM) processes generate plastic or metal parts layer-by-layer without using formative tools. The resulting advantages highlight the capability of AM to become an inherent part within the product development. However, process specific challenges such as a high surface roughness, the stair-stepping effect or geometrical deviations inhibit the industrial establishment. Thus, additively manufactured parts often need to be post-processed using established manufacturing processes. Many process parameters and geometrical factors influence the manufacturing accuracy in AM which can lead to large deviations and high scatterings. Published results concerning these deviations are also difficult to compare, because they are based on several geometries that are manufactured using different processes, materials and machine settings. It is emphasized that reliable tolerances for AM are difficult to define in standards. Within this investigation, a uniform method was developed regarding relevant test specimens to examine geometrical deviations for Laser Beam Melting (LBM), Fused Deposition Modeling (FDM) and Selective Laser Sintering (SLS) in order to derive geometrical tolerance values. The manufactured test specimens were measured using tactile and optical systems to examine the occurring geometrical deviations. The results show possible geometrical tolerance values that were classified according to the international standard DIN EN ISO 286-1.}}, author = {{Lieneke, Tobias and Künneke, Thomas and Schlenker, Fabian and Denzer, Vera and Zimmer, Detmar}}, booktitle = {{Special Interest Group Meeting: Advancing Precision in Additive Manufacturing}}, title = {{{Manufacturing Accuracy In Additive Manufacturing: A Method To Determine Geometrical Tolerances}}}, doi = {{https://www.euspen.eu/knowledge-base/AM19129.pdf}}, year = {{2019}}, } @article{22444, author = {{Künneke, Thomas and Zimmer, Detmar}}, isbn = {{0937-4167}}, journal = {{konstruktionspraxis}}, pages = {{24--26}}, publisher = {{Vogel Communications Groupe GmbH & Co. KG}}, title = {{{Schall mittels Pulver dämpfen}}}, volume = {{6}}, year = {{2019}}, } @phdthesis{22500, author = {{Kriegel, Nils-Peter}}, isbn = {{978-3-8440-7058-3}}, publisher = {{Shaker Verlag GmbH }}, title = {{{Konzeption eines energieeffizienten Betätigungs- und Haltesystems für eine Federkraftbremse}}}, year = {{2019}}, } @article{34432, abstract = {{Diese Untersuchung befasst sich mit dem in der Praxis häufig auftretenden, riefenförmigen Verschleiß gehärteter Wellen im Dichtkontakt mit Radialwellendichtringen (RWDR) aus Fluorkautschuk (FKM). Ziel ist es, die Verschleißmechanismen an einer gehärteten Stahlwelle im geschmierten tribologischen Kontakt mit einem elastomeren FKM-Radialwellendichtring anhand experimenteller Modellsysteme aufzuklären. Weiterhin wird die Wechselwirkung des Dichtringverschleißes und Wellenverschleißes aufgrund der sich ständig verändernden Oberflächenmorphologie der Kontaktpartner oberflächenanalytisch charakterisiert. Das entstandene Schadensbild kann simulativ nachgestellt werden und zeigt eine gute Übereinstimmung mit dem tribologischen Experiment.}}, author = {{Burkhart, Christoph and Emrich, Stefan and Magyar, Balázs and Kopnarski, Michael and Sauer, Bernd}}, issn = {{0724-3472}}, journal = {{Tribologie und Schmierungstechnik}}, keywords = {{nanoindentation}}, number = {{4-5}}, pages = {{9–18}}, title = {{{Nachbildung und Analyse von Schadensmechanismen bei Dichtringen im tribologischen Ersatzsystem}}}, doi = {{10.30419/TuS-2019-0019}}, volume = {{66}}, year = {{2019}}, } @article{34437, abstract = {{In oil-lubricated worm gears, all moving components cause power losses during operation. These losses depend, among other things, on the viscosity of the lubricant used, which in turn is determined by the temperature present in the gearbox. The dependency between the temperature and the power dissipation is mutual, and they influence each other. For the analysis of gearboxes under transient conditions, the relationship among operating conditions, power dissipation, and temperature must be considered. In this paper, a method for the analysis of these interrelationships is presented, which is based on the combination of tribological simulation and thermal networks. With the developed calculation model, the gearbox efficiency and the temperature over time can be estimated for arbitrary load cases. The calculation results are compared with measurements on a real gearbox.}}, author = {{Oehler, Manuel and Sauer, Bernd and Magyar, Balázs}}, issn = {{0742-4787}}, journal = {{Journal of Tribology}}, number = {{12}}, title = {{{Efficiency of Worm Gear Drives Under Transient Operating Conditions}}}, doi = {{10.1115/1.4044655}}, volume = {{141}}, year = {{2019}}, } @inproceedings{35102, author = {{Burkhart, C and Heimes, J and Weyrich, D and Magyar, Balázs and Sauer, B}}, isbn = {{978-3-946260-02-8}}, location = {{Mannheim}}, pages = {{221--235}}, title = {{{Vollvalidiertes thermisches Netzwerk eines RWDR- Ersatzsystems}}}, year = {{2019}}, } @inproceedings{35194, author = {{Keßler, A and Elkenkamp, P and Magyar, Balázs and Mayer, C}}, booktitle = {{Tribologie und Schmierungstechnik}}, isbn = {{978-3-9817451-4-6}}, pages = {{72/1--72/7}}, publisher = {{GfT}}, title = {{{Beurteilung der Leistungsfähigkeit von Schmierstoffen mittels eines FZG Prüfstandes}}}, year = {{2019}}, } @inproceedings{34612, author = {{Foko Foko, F and Sauer, B and Magyar, Balázs}}, isbn = {{978-3-9817451-4-6}}, pages = {{47/1--47/11}}, publisher = {{GfT }}, title = {{{Reibenergie basierte Verschleißsimulation für Radialwellendichtringe}}}, year = {{2019}}, } @article{22445, abstract = {{Am Beispiel des chinesisch-deutschen Kooperationsstudiengangs Maschinenbau an der Chinesisch-Deutschen Technischen Fakultät in Qingdao (China) werden unter Rückgriff auf unterschiedliche im Rahmen formativer Evaluation erhobener Datensätze Möglichkeiten und Grenzen der Integration von Fach- und Sprachlernen sowie Optimierungsmöglichkeiten der Unterstützung des studienvorbereitenden und -begleitenden (Fach-)Spracherwerbs diskutiert.}}, author = {{Denzer, Vera and Didier, Andrea and Drumm, Sandra and Hambach, Dennis and Kaplinska-Zajontz, Marta and Noeke, Josef and Settinieri, Julia and Xi, Lin and Zhu, Hongyu}}, isbn = {{2511-0853}}, journal = {{Informationen Deutsch als Fremdsprache}}, number = {{1}}, pages = {{178--199}}, publisher = {{De Gruyter Mouton}}, title = {{{Integration von Sprach- und Fachlernen im Kontext chinesisch-deutscher Kooperationsstudiengänge am Beispiel des Maschinenbaustudiums an der Chinesisch-Deutschen Technischen Fakultät (CDTF, Qingdao/Paderborn)}}}, doi = {{10.1515/infodaf-2019-0013}}, volume = {{46}}, year = {{2019}}, } @inproceedings{22441, abstract = {{According to ISO / ASTM 52900, additive manufacturing (AM) is defined as "the process of joining materials to make parts from 3D model data, usually layer upon layer, as opposed to conventional manufacturing including subtractive manufacturing technologies and formative manufacturing methodologies” [1]. This results in significant advantages over conventional manufacturing methodologies, such as the production of topologically optimized, complex structures, lower material consumption or shorter product development cycles. In order to be able to use these advantages, the possibilities and restrictions of the processes must be known. In particular, selective laser beam melting (SLM), in which a powdery metallic starting material is melted by means of a laser, requires a sound understanding of the process. For this purpose, design guidelines have been presented in various scientific papers. These design guidelines help to design a component in such a way that it can be manufactured successfully using additive manufacturing. These so-called “AMsuitable design guidelines” can be found among others at Adam, Kranz and Thomas [2,3,4,5]. In contrast to established manufacturing processes, the post-processing of additive components is divided into two steps. First, the AM immanent post processing, such as the removing of the component from the building platform or the removing of the remaining powder. These post-processing steps are in the following referred to “post-processing”. Secondly, the subsequent post-processing steps to improve the component properties, such as milling and turning or a stress-relief annealing. These are referred to as “finishing” and form the focus of this paper. With regard to a successful finishing of additively manufactured components, design guidelines must be taken into account that consider the finishing inherent restrictions and possibilities. In the following, these design guidelines are referred to “finishing suitable”. They can deviate significantly from those of conventionally manufactured components in the case of additively manufactured components. Although there are some investigations that deal with the post-processing of additively manufactured components [6,7], there are hardly any design guidelines that are suitable for finishing [8]. Therefore, knowledge about the finishing of additively manufactured components is based on experimental experience rather than on scientific knowledge. For this reason, design guidelines for a finishing suitable design must be methodically determined and quantified. These quantified design guidelines can be used for an automated design check on complex components like topology optimized geometries.}}, author = {{Lammers, Stefan and Tominski, Johannes and Zimmer, Detmar}}, booktitle = {{II International Conference on Simulation for Additive Manufacturing Sim-AM 2019 11-13 September, 2019}}, isbn = {{978-84-949194-8-0}}, pages = {{174--185}}, title = {{{Guidelines for post processing oriented design of additive manufactured parts for use in topology optimization}}}, doi = {{http://congress.cimne.com/sim-am2019/frontal/doc/EbookSim-AM2019.pdf}}, year = {{2019}}, } @inproceedings{24105, author = {{Urbanek, Stefan and Ponick, Bernd and Taube, Alexander and Hoyer, Kay-Peter and Schaper, Mirko and Lammers, Stefan and Lieneke, Tobias and Zimmer, Detmar}}, booktitle = {{2018 IEEE Transportation Electrification Conference and Expo (ITEC)}}, title = {{{Additive Manufacturing of a Soft Magnetic Rotor Active Part and Shaft for a Permanent Magnet Synchronous Machine}}}, doi = {{10.1109/itec.2018.8450250}}, year = {{2018}}, }