Now showing 1 - 10 of 47542
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Study on collaborative product development and digital engineering tools

2012 , Müller, Patrick , Pasch, Florian , Hayka, Haygazun , Bedenbender, Heinz , Drewinski, Roland , Stark, Reiner

Today, product development is characterized by cross-company collaboration and an intensive exchange of product data. Engineers typically apply a multitude of digital engineering tools and act in diverse engineering processes. In a current study, the culture of todays collaborative product development was investigated in significant detail. The questions are: How do engineers work today? Which tasks play a major role in their daily business? How much time is remaining for core engineering tasks like design, calculation and design validation? How do engineers assess their workplace (environment)? Where are opportunities for enhancement of processes and digital engineering tools? In total, 1,401 engineers answered the questionnaires. Details of the study and selected findings are presente d in this paper. Interesting findings are related to collaborative engineering and engineering design, Product Data and Lifecycle Management (PDM/PLM), virtual product creation, information and process management, and new media in engineering design.

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Spule-Zahn-Modul und Verfahren zu dessen Herstellung

2020 , Busse, Matthias , Weck, Christian , Wöstmann, Franz-Josef

Gegenstand der Erfindung ist ein Spule-Zahn-Modul sowie ein Verfahren zu dessen Herstellung. Eine vorgefertigte Spule wird mit einem metallischen Pulver befüllt und dieses Pulver anschließend zu einem Zahn verpresst, so dass ein Spule-Zahn-Modul entsteht, bei welchem der Zahn direkt an der Spule anliegt.

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MIM for HT turbine parts: Gas-atomized versus mechanically milled Nb-Si alloy powder

2016 , Mulser, Marco , Hartwig, Thomas , Seemüller, Christoph , Heilmaier, Martin , Adkins, Nicholas , Wickins, Mick

Refractory-metal silicide composites feature good HT strength, corrosion resistance and offer the potential to replace Ni-based superalloys in HT applications. In this study, a Nb-Si based alloy was gas-atomized to develop MIM for turbine engine parts. The fraction of fine powder (<25 mm) was used directly for feedstock development. The fraction of coarser powder (45-106 mm) was subjected to mechanical milling to reduce the particle size and to increase the powder yield for MIM. Both powders were processed into complex-shaped MIM parts. The influence of the powder processing route on feedstock properties, green part quality, microstructure, residual porosity, oxygen content and mechanical properties at elevated temperatures was analysed. The results show that mechanically milled powders are a suitable alternative to directly gas-atomized powders revealing even better shape retention for the processed MIM parts.

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Sandwich structures consisting of aluminum foam core and fiber reinforced plastic top layers

2016 , Drebenstedt, Claudia , Rybandt, Susi , Drossel, Welf-Guntram , Trautmann, Maik , Wagner, Guntram

Thinking of new approaches for light weight design with sandwiches the combination of aluminum foam as core and fiber reinforced plastics as top layers can be a good way to increase the light weight aspect and combine advantages of both materials. For structural applications often a high bending stiffness and a good damping capability in the combination with the lightweight aspect are needed. For these new sandwiches especially the bonding properties are crucial for later applications. Therefore investigations regarding the bonding properties of the combination of the two components are carried out. The objective is to find a way of combining these materials without adhesives. Different ways of composite manufacturing are tested and compared according to DIN 53292: ""testing of sandwiches; tensile test perpendicular to the faces"". Furthermore different pretreatments of the foam core are compared. These include sandblasting with a chemically modified blasting material, a structure included by a modification of the foaming tool and untreated foam for comparison reasons to the state of the art. It is found that the structure induced during the foaming step is suitable for adhesive bonding, but not for the other processes. Better results can be expected by further adaption of the implemented structure. The best results in the compression molding process are obtained with the sandblasted foam cores.

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Finding a line between trusted and untrusted information on tweets through sequence classification

2020 , Pritzkau, Albert , Winandy, Steffen , Krumbiegel, Theresa

The Internet has long since established itself as an indispensable source of information for both organizations and individuals. The lack of social responsibility of many digital platforms, however, offers many incentives for various forms of abuse. Disinformation, propaganda and fake news are just a few examples. Among the actors of information campaigns, we find not only individuals but also state actors with a clear agenda. Often, such information campaigns make use of psychological and rhetorical methods to achieve their goals. The manipulation of information is a major challenge for our democracies. It also presents us with major technical problems to identify and assess risks arising from the dissemination of such information. The following system description present s our approach to the detection of misinformation on social media data, which is twofold. Initially, we subjected the given training data to an exploratory analysis to get an overview of the general structure. Then we framed the given task as a simpler classification problem. In order to distinguish between trusted and untrusted information, using BERT (Bidirectional Encoder Representations from Transformers) as a neural network architecture for sequence classification, we started with a pre-trained model for language representation. In a supervised training step we fine-tuned this model on the given classification task with the provided annotated data. In this paper we would like to discuss both the quality of the training data and the performance of the trained classifier to derive promising directions for future work.

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Mobile robotics for offshore automation

2008 , Graf, Birgit , Pfeiffer, Kai

This paper describes application areas for mobile service robots in offshore oil and gas producing environments, requirements and restrictions for the use of the robots together with a first prototype and its evaluation in a field test. The field of offshore oil and gas production is analyzed in the first part to identify possible application scenarios for mobile automation. It shows that there is a wide variety of applications for mobile automation. In the second part the offshore environment is analyzed in respect of the use of mobile robots. The results of this analysis are requirements and restrictions for the construction especially due to explosive atmosphere and the hazardous environment. In the last part a first offshore inspection and manipulation robot prototype is presented together with the results of a first offshore application test. The evaluation of this first autonomous service robot that has ever been operated in offshore environments has proven the applicability of mobile robots to offshore platforms.

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Dynamisches Sampling zur visuellen Exploration von großen dicht-besetzten Matrizen

2013 , Roskosch, Philipp , Davey, James

In dieser Bachelorarbeit präsentiere ich eine Technik, die die visuelle Exploration von großen dicht-besetzten Ähnlichkeitsmatrizen ermöglicht. Sie erlaubt den Vergleich mehrerer Dimensionen eines multivariaten Datensatzes. Für die Visualisierung werden die Daten durch Sampling reduziert. Die Zugriffszeit auf einzelne Elemente ist mit steigender Matrixgröße ein immer größer werdendes Problem. Ich untersuche verschiedene Datenbankmanagementsysteme und vergleiche die Zugriffszeiten bei verschiedenen Problemgrößen. Die Visualisierung reagiert auf Interaktion des Benutzers und ermöglicht den Fokus auf bestimmte Bereiche innerhalb der Daten. Dafür werden die Daten nach Benutzerinteresse gefiltert und die Visualisierung mit Subsamples der gefilterten Daten verfeinert. Der Kontext bleibt bei diesem Prozess erhalten. Der Fokus ermöglicht die Entdeckung von Zusammenhängen, die sonst im Verborgenen bleiben.

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OptPlanEnergie - an optimization and scheduling platform for the energy-efficient production of tempered glass

2016 , Baumann, Frank , Wilson, Heike , Seidel, Stephan , Franke, Matthias , Gromnitza, Ulrike

The aim of the project OptPlanEnergie is to develop an integrated optimization and scheduling platform that specifically targets the reduction of energy consumption by optimizing the production orders in the glass tempering industry. The platform will use multi-criteria optimization techniques to determine energy-efficient loading sequences, utilizing thermo-dynamic black box models trained on data measured by energy meters at the tempering process of safety glass.

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Der letzte Schritt ist der wichtigste

2020 , Gotzmann, Gaby , König, Ulla

Die Entwicklung neuer Medizinprodukte setzt in vielen Einsatzbereichen auf die Nutzung von Hightech Strategien. Dies reicht von spezialisierten Sensoren und Mikrochips bis hin zu hochfunktionalisierten Oberflächen und Materialien, die auf spezielle Art und Weise mit dem umgebenden Körpergewebe interagieren. Die Aufbereitung solcher Medizinprodukte wird immer öfter zur Herausforderung in der Medizintechnik.

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An ultrasonic non-destructive testing method for evaluating resistance spot welding quality

2018 , Wu, Yupeng , Wei, Ziang , Osman, Ahmad , Zhang, Xiaodan , Zhang, Baojun , Cai, Guixi , Han, Xiaohui , Zhou, Qingxiang , Zhao, Yang

The resistance spot welding is a major method for joining sheet metals in high-speed train manufacturing industry. The accuracy and rapidity of evaluating the resistance spot welding quality is the key point of ensuring the manufacturing quality and running safety of the high-speed train. In this paper, a Nondestructive Testing (NDT) system is set up based on ultrasound pulse-echo method for detecting manufacturing defects and measuring the indentation depth and nugget diameter of resistance spot welding. In order to verify the accuracy of indentation depth and nugget diameter measured by the NDT system, the inspection results are compared with metallographic analysis. In addition, the resistance spot welding indentation depth of some resistance spot welding samples are analyzed before and after increasing the welding energy, the results show that increasing the welding energy can improve the welding quality.