@inproceedings{57187,
author = {{Stieren, Stephan and Lenger, Luca and Kliem, Moritz and Henke, Christian and Trächtler, Ansgar}},
booktitle = {{2024 IEEE International Systems Conference (SysCon)}},
publisher = {{IEEE}},
title = {{{Development of digital business models for holistic energy management on device, home and grid level}}},
doi = {{10.1109/syscon61195.2024.10553440}},
year = {{2024}},
}
@inproceedings{57184,
author = {{Poy, Yi Han and Zarnack, Martin and Henkenjohann, Mark and Nolte, Udo}},
booktitle = {{AIAA SCITECH 2024 Forum}},
publisher = {{American Institute of Aeronautics and Astronautics}},
title = {{{Aerodynamic Derivatives Identification of a Fixed-Wing UAV using Flight Data}}},
doi = {{10.2514/6.2024-0248}},
year = {{2024}},
}
@inproceedings{57186,
author = {{Schmidt, Robin and Schütz, Stefan and Prinz, Sebastian and Henke, Christian and Trächtler, Ansgar}},
booktitle = {{Proceedings of the 4th IFSA Winter Conference on Automation, Robotics and Communications for Industry 4.0/5.0 (ARCI 2024)}},
title = {{{Optimizing Welding Efficiency: A First Approach for an Automated Mobile Welding Robot}}},
year = {{2024}},
}
@article{57176,
abstract = {{Incremental nonlinear dynamic inversion (INDI) is a widely used approach to controlling UAVs with highly nonlinear dynamics. One key element of INDI-based controllers is the control allocation realizing pseudo controls using available actuators. However, the tracking of commanded pseudo controls is not the only objective considered during control allocation. Since the approach only works locally due to linearization and the solution is often ambiguous, additional aspects like control efforts or penalizing the deviation of certain states must be considered. Conducting the control allocation by solving a quadratic program this results in a considerable number of weighting parameters, which must be tuned during control design. Currently, this is conducted manually and is therefore time consuming. An automated approach for tuning these parameters is therefore highly beneficial. Thus, this paper presents and evaluates a model-based approach automatically tuning the control allocation parameters of a tiltrotor VTOL using an optimization algorithm. This optimization algorithm searches for optimal parameters minimizing a cost functional that reflects the design target. This cost functional is calculated based on a test mission for the VTOL which is conducted within a simulation environment. The test mission represents the common operating range of the VTOL. The simulation environment consists of an aircraft model as well as a model of the INDI-based controller which is dependent on the control allocation parameters. On this basis, model-based optimization is conducted and the optimal parameters are identified. Finally, successful real-world tests on a 4-degrees-of-freedom testbench using the identified parameters are presented. Since the control allocation parameters can significantly influence the aircraft’s stability, the 4-DOF testbench for the aircraft is required for rapid validation of the parameters at a minimum amount of risk.}},
author = {{Henkenjohann, Mark and Nolte, Udo and Sion, Fabian and Henke, Christian and Trächtler, Ansgar}},
issn = {{2076-0825}},
journal = {{Actuators}},
number = {{5}},
publisher = {{MDPI AG}},
title = {{{Parameter Tuning Approach for Incremental Nonlinear Dynamic Inversion-Based Flight Controllers}}},
doi = {{10.3390/act13050187}},
volume = {{13}},
year = {{2024}},
}
@inproceedings{57173,
abstract = {{Manufacturing processes benefit from property control enabling reproducibility, application oriented outcomes, and efficient part production. In reverse flow forming, state of the art practices focus primarily on geometry control, neglecting property control. Given the intricacies of the process involving the interaction of tool and machine behavior, process parameters, properties of semi finished products and temperatures, incorporating process control becomes an imperative for producing components with predefined properties. The property controlled within this reverse flow forming process is the local α’ martensite content. Therefore, process strategies to actively influence the α’ martensite content must be implemented. In this study seamless AISI 304L steel tubes are used, where α’ martensite formation is strain and/or temperature induced through phase transformation within the process. This paper presents innovative process strategies, methods, and specially developed mechanical and thermal actuator systems to locally increase or suppress the α’ martensite content. The use and implementation of these approaches and tools allows the creation of unique optically invisible microstructure profiles containing 3D gradings, implying a radial grading of α’ martensite. The locally implemented α’ martensite, forming these 3D gradings, offers potential applications for functional or sensory purposes. This paper extends beyond theoretical concepts, providing tangible component outcomes.}},
author = {{Arian, Bahman and Homberg, Werner and Kersting, Lukas and Trächtler, Ansgar and Rozo Vasquez, Julian and Walther, Frank}},
booktitle = {{Materials Research Proceedings}},
issn = {{2474-395X}},
publisher = {{Materials Research Forum LLC}},
title = {{{α’-martensite grading techniques in reverse flow forming of AISI 304L}}},
doi = {{10.21741/9781644903254-76}},
volume = {{44}},
year = {{2024}},
}
@inproceedings{57174,
abstract = {{Increasing the sustainability and resource efficiency of forming processes is one of today's major goals. High-strength wire materials are usually available as strip material and are subjected to a downstream forming process such as punch-bending to produce parts for the electronics industry, for example. During the manufacturing process of the semi-finished product, residual stresses and plastic deformations are introduced into the wire by rolling and drawing processes. Straightening machines are used in the production lines to compensate for these. To increase the sustainability of these production lines, the straightening process is an essential step. Before the continuous manufacturing process starts, the straightening process must be set up and the optimal roller positions must be found. Once the process is set up, the roller position settings are usually not changed. Due to missing measurement systems for the straightening quality, it is not possible to dynamically adjust the positions of the straightening rollers to variations in the material properties. This leads to deviations in the dimensional accuracy of the components to be produced and thus to an increase in the rejection rate in the manufacturing processes. To reduce the rejection rate, a novel control system for a continuous feedback control of a straightening process is presented in this paper. This leads to a reduction of the rejection rate and unnecessary preforming operations in wire straightening process. The result is an increasing sustainability and efficiency of these production process.}},
author = {{Bathelt, Lukas and Djakow, Eugen and Henke, Christian and Trächtler, Ansgar}},
booktitle = {{Materials Research Proceedings}},
issn = {{2474-395X}},
publisher = {{Materials Research Forum LLC}},
title = {{{Innovative control system for straightening machines using sensor information from downstream processes}}},
doi = {{10.21741/9781644903131-308}},
volume = {{41}},
year = {{2024}},
}
@inproceedings{57178,
abstract = {{The incremental flow forming process is currently enhanced in research context by special closed-loop property control concepts to increase the productivity and to control the product properties making invisible property structures like a magnetic barcode possible. However, it is preferred to establish property control concepts on single roller machines instead of conventional machines with three roller actuation due to the better machine accessibility. For those single roller machines, rather poor surface qualities of flow formed workpieces were observed in the past especially for hydraulic actuators. Thus, a new actuator closed-loop position control concept is developed in this paper using model-based control design methods and taking the flow forming forces as a load into account. The novel closed-loop control is validated during workpiece production at the actual single roller flow forming machine. An analysis of the manufactured workpieces show that the surface quality is significantly enhanced by the new control to a roughness level almost similar to conventional three roller flow forming. Thus, a sincere added value to the flow forming process is offered by the novel actuator closed-loop position control.}},
author = {{Kersting, Lukas and Sander, Sebastian and Arian, Bahman and Rozo Vasquez, Julian and Trächtler, Ansgar and Homberg, Werner and Walther, Frank}},
booktitle = {{Materials Research Proceedings}},
issn = {{2474-395X}},
publisher = {{Materials Research Forum LLC}},
title = {{{Improving the flow forming process by a novel closed-loop control}}},
doi = {{10.21741/9781644903131-158}},
volume = {{41}},
year = {{2024}},
}
@inproceedings{57183,
abstract = {{In multi-stage bending and straightening operations cross-stage and quantity-dependent effects crucially affect the quality of the end product. Using punch-bending units in combination with a mechatronic straightening device can improve the accuracy and repeatability of product features remarkably well. In this work a concept for an innovative hybrid model of a roll straightener in a multi-stage straightening and multi-stage bending process is proposed. This model combines data-driven elements with expert knowledge and aims to minimise residual errors of the roll straightener to reliably decrease the risk of disadvantageous cross-stage and quantity-dependent effects on a subsequent punch-bending process.}},
author = {{Peters, Henning and Djakow, Eugen and Rostek, Tim and Mazur, Andreas and Trächtler, Ansgar and Homberg, Werner and Hammer, Barbara}},
booktitle = {{Materials Research Proceedings}},
issn = {{2474-395X}},
publisher = {{Materials Research Forum LLC}},
title = {{{Novel approach for data-driven modelling of multi-stage straightening and bending processes}}},
doi = {{10.21741/9781644903131-252}},
volume = {{41}},
year = {{2024}},
}
@inproceedings{57171,
abstract = {{In manufacturing, property control ensures efficient part production. However, in reverse flow forming, current practices focus on geometry control rather than property control. To address the complexity of the process and tool machine interaction, process control is crucial for defined component properties. This study focuses on controlling local α’ martensite content in reverse flow forming of seamless AISI 304L steel tubes. Strategies and systems are presented to influence α’ martensite content, creating unique microstructure profiles for 1D and 2D Gradings, with tangible component outcomes.}},
author = {{Arian, Bahman and Homberg, Werner and Kersting, Lukas and Trächtler, Ansgar and Rozo Vasquez, Julian and Walther, Frank}},
booktitle = {{Materials Research Proceedings}},
issn = {{2474-395X}},
publisher = {{Materials Research Forum LLC}},
title = {{{Thermomechanical reverse flow forming of AISI 304L}}},
doi = {{10.21741/9781644903131-151}},
volume = {{41}},
year = {{2024}},
}
@inproceedings{57177,
author = {{Jahneke, Julien and Nolte, Udo and Henkenjohann, Mark and Seidenberg, Tobias and Henke, Christian and Trächtler, Ansgar}},
booktitle = {{2024 IEEE Aerospace Conference}},
publisher = {{IEEE}},
title = {{{Development and Implementation of a Modular Interface for a DroneCAN Communication Bus}}},
doi = {{10.1109/aero58975.2024.10521247}},
year = {{2024}},
}
@inproceedings{57180,
author = {{Lenz, Cederic and Bause, Maximilian and Henke, Christian and Trächtler, Ansgar}},
booktitle = {{2024 International Conference on Advanced Robotics and Mechatronics (ICARM)}},
publisher = {{IEEE}},
title = {{{Boosting Low Data PINN Robustness with Transfer Learning*}}},
doi = {{10.1109/icarm62033.2024.10715896}},
year = {{2024}},
}
@book{57192,
author = {{Bürgel, Christoph and Siepmann, Dirk}},
publisher = {{Amazon}},
title = {{{Grammatik des gesprochenen und geschriebenen Französisch: Adverbiale, Fürwörter und Verneinung}}},
volume = {{4}},
year = {{2024}},
}
@inproceedings{56137,
abstract = {{Many Android applications collect data from users. The European Union's General Data Protection Regulation (GDPR) requires vendors to faithfully disclose which data their apps collect. This task is complicated because many apps use third-party code for which the same information is not readily available. Hence we ask: how accurately do current Android apps fulfill these requirements?
In this work, we first expose a multi-layered definition of privacy-related data to correctly report data collection in Android apps. We further create a dataset of privacy-sensitive data classes that may be used as input by an Android app. This dataset takes into account data collected both through the user interface and system APIs.
We manually examine the data safety sections of 70 Android apps to observe how data collection is reported, identifying instances of over- and under-reporting. Additionally, we develop a prototype to statically extract and label privacy-related data collected via app source code, user interfaces, and permissions. Comparing the prototype's results with the data safety sections of 20 apps reveals reporting discrepancies. Using the results from two Messaging and Social Media apps (Signal and Instagram), we discuss how app developers under-report and over-report data collection, respectively, and identify inaccurately reported data categories.
Our results show that app developers struggle to accurately report data collection, either due to Google's abstract definition of collected data or insufficient existing tool support. }},
author = {{Khedkar, Mugdha and Mondal, Ambuj Kumar and Bodden, Eric}},
booktitle = {{In Proceedings of the 39th IEEE/ACM International Conference on Automated Software Engineering Workshops (ASEW ’24)}},
location = {{Sacramento, California}},
title = {{{Do Android App Developers Accurately Report Collection of Privacy-Related Data?}}},
doi = {{10.1145/3691621.3694949}},
year = {{2024}},
}
@inproceedings{53665,
author = {{Tissen, Denis and Wiederkehr, Ingrid and Koldewey, Christian and Dumitrescu, Roman}},
booktitle = {{2023 IEEE International Conference on Technology Management, Operations and Decisions (ICTMOD)}},
publisher = {{IEEE}},
title = {{{Exploring data-driven model-based systems engineering: a systematic literature review}}},
doi = {{10.1109/ictmod59086.2023.10438129}},
year = {{2024}},
}
@article{53622,
abstract = {{In K-12 computing education, there is a need to identify and teach concepts that are relevant to understanding machine learning technologies. Studies of teaching approaches often evaluate whether students have learned the concepts. However, scant research has examined whether such concepts support understanding digital artefacts from everyday life and developing agency in a digital world. This paper presents a qualitative study that explores students’ perspectives on the relevance of learning concepts of data-driven technologies for navigating the digital world. The underlying approach of the study is data awareness, which aims to support students in understanding and reflecting on such technologies to develop agency in a data-driven world. This approach teaches students an explanatory model encompassing several concepts of the role of data in data-driven technologies. We developed an intervention and conducted retrospective interviews with students. Findings from the analysis of the interviews indicate that students can analyse and understand data-driven technologies from their everyday lives according to the central role of data. In addition, students’ answers revealed four areas of how learning about data-driven technologies becomes relevant to them. The paper concludes with a preliminary model suggesting how computing education can make concepts of data-driven technologies meaningful for students to understand and navigate the digital world.}},
author = {{Höper, Lukas and Schulte, Carsten}},
issn = {{1648-5831}},
journal = {{Informatics in Education}},
keywords = {{Computer Science Applications, Communication, Education, General Engineering}},
publisher = {{Vilnius University Press}},
title = {{{Empowering Students for the Data-Driven World: A Qualitative Study of the Relevance of Learning about Data-Driven Technologies}}},
doi = {{10.15388/infedu.2024.19}},
year = {{2024}},
}
@inproceedings{57209,
author = {{Höper, Lukas and Schulte, Carsten}},
booktitle = {{Proceedings of the 24th Koli Calling International Conference on Computing Education Research}},
location = {{Koli, Finnland}},
publisher = {{ACM}},
title = {{{New Perspectives on the Future of Computing Education: Teaching and Learning Explanatory Models}}},
doi = {{10.1145/3699538.3699558}},
year = {{2024}},
}
@inproceedings{55481,
author = {{Höper, Lukas and Schulte, Carsten and Mühling, Andreas}},
booktitle = {{Proceedings of the 2024 on Innovation and Technology in Computer Science Education V. 1}},
location = {{Mailand, Italien}},
publisher = {{ACM}},
title = {{{Students' Motivation and Intention to Engage with Data-Driven Technologies from a CS Perspective in Everyday Life}}},
doi = {{10.1145/3649217.3653625}},
year = {{2024}},
}
@inproceedings{55656,
author = {{Höper, Lukas and Schulte, Carsten and Mühling, Andreas}},
booktitle = {{Proceedings of the 2024 ACM Conference on International Computing Education Research - Volume 1}},
publisher = {{ACM}},
title = {{{Learning an Explanatory Model of Data-Driven Technologies can Lead to Empowered Behavior: A Mixed-Methods Study in K-12 Computing Education}}},
doi = {{10.1145/3632620.3671118}},
volume = {{10}},
year = {{2024}},
}
@inproceedings{56347,
abstract = {{The content of university teaching in engineering sciences, particularly in product creation, is characterised by the development of application skills. Changing working conditions require new teaching concepts that are oriented towards the needs of students and practice and consider the acquisition of soft skills. A key method to be considered in this context is the Scenario-Technique. In this paper, a one-day workshop based on a software tool for the Scenario-Technique is presented that focusses on competence development for Scenario-Technique in form of a learning concept. Based on a systematic literature analysis, existing approaches for learning the Scenario-Technique are identified and requirements for a subsequently developed software-supported Scenario-Technique workshop are established. Using a case study, the learning concept is validated in two test phases for comprehensibility, user-friendliness, and practical suitability. The result is a concept that enables practice-oriented learning of the Scenario-Technique.}},
author = {{Gräßler, Iris and Tusek, Alena Marie}},
booktitle = {{AHFE International}},
location = {{Split}},
publisher = {{AHFE International}},
title = {{{Case study on the software-supported development of competences in Scenario-Technique}}},
doi = {{10.54941/ahfe1005548}},
volume = {{158}},
year = {{2024}},
}
@unpublished{57233,
author = {{Weiler, David and Burde, Jan-Philipp and Costan, Kasim and Große-Heilmann, Rike Isabel and Kulgemeyer, Christoph and Riese, Josef and Schubatzky, Thomas}},
booktitle = {{PhyDid B - Beiträge zur DPG-Frühjahrstagung 2024 in Greifswald}},
title = {{{Förderung digitaler Kompetenzen von Physik-Lehrkräften im ComeNet Physik}}},
year = {{2024}},
}