openHSU – Research Showcase

4491
Research outputs
779
People
140
Organizational Units
108
Projects
31
Conferences
17
Journals
Recent Additions
  • Publication
    Open Access
    Governance-Transformationen und neue Formen des Policymaking am Beispiel der Digitalisierung von (schulischer) Bildung in Deutschland
    (UB HSU, 2024)
    Förschler, Lea-Annina
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    Helmut-Schmidt-Universität / Universität der Bundeswehr Hamburg
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    Macgilchrist, Felicitas
  • Publication
    Metadata only
    Where are we heading? Hackathons as a new, relational form of policymaking
    (Routledge, Taylor & Francis, 2024)
    Förschler, Annina
    ;
    Decuypere, Mathias
  • Publication
    Metadata only
    Das "Who is who?" der deutschen Bildungs-Digitalisierungsagenda
    (Budrich, 2018)
    Förschler, Annina
  • Publication
    Metadata only
    P2.13 Korrelation von wiederholten Messungen in einer Modenverwirbelungskammer
    Modenverwirbelungskammern (MVKn) stellen vielfältig verwendbare, reproduzierbare Messumgebungen dar. Grundsätzlich handelt es sich dabei um elektromagnetisch geschirmte Volumina, in denen sog. Modenrührer eingebracht sind, die ein elektromagnetisches Feld „verwirbeln“, sodass ein Prüfling einer definierten aber statistisch variierenden Umgebung ausgesetzt wird. Die Modenrührer in MVKn können schrittweise zwischen den einzelnen Messzeitpunkten oder kontinuierlich verfahren werden. In diesem Beitrag werden die jeweiligen Eigenschaften von wiederholten Messungen, die sowohl bei kontinuierlichem als auch schrittweisem Betrieb der Modenrührer aufgenommen wurden, betrachtet. Mit Hilfe von Korrelationskoeffizenten wird jeweils die Wiederholbarkeit der aufgenommenen Messwertsequenzen insgesamt untersucht. Darüber hinaus wird die Wiederholbarkeit von Fadingeinbrüchen gesondert betrachtet, da diese einen wesentlichen Einfluss auf Funksysteme haben, die mittels einer MVK charakterisiert werden können. Als Ursache für Abweichungen bei Wiederholungen wird abschließend das zeitliche Verhalten bzw. die Streuungen zwischen den Messzeitpunkten betrachtet.
  • Publication
    Metadata only
    IO-Link Wireless enhanced factory automation communication for Industry 4.0 applications
    (Copernicus, 2018-03-06) ;
    Krush, Dmytro
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    ; ;
    Kaercher, Bernd
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    Ritter, Jochen
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    Gaggero, Pascal
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    Rentschler, Markus
    In the context of the Industry 4.0 initiative, Cyber-Physical Production Systems (CPPS) or Cyber Manufacturing Systems (CMS) can be characterized as advanced networked mechatronic production systems gaining their added value by interaction with the ambient Industrial Internet of Things (IIoT). In this context appropriate communication technologies and standards play a vital role to realize the manifold potential improvements in the production process. One of these standards is IO-Link. In 2016 more than 5 million IO-Link nodes have been produced and delivered, still gaining increasing acceptance for the communication between sensors, actuators and the control level. The steadily increasing demand for more flexibility in automation solutions can be fulfilled using wireless technologies. With the wireless extension for the IO-Link standard, which will be presented in this article, maximum cycle times of 5 ms can be achieved with a probability that this limit will be exceeded to be at maximum one part per billion. Also roaming capabilities, wireless coexistence mechanisms and the possibility to include battery-powered or energy-harvesting sensors with very limited energy resources in the realtime network were defined. For system planning, setup, operation and maintenance, the standard engineering tools of IO-Link can be employed so that the backward compatibility with wired IO-Link solutions can be guaranteed. Interoperability between manufacturers is a key requirement for any communication standard, thus a procedure for IO-Link Wireless testing is also suggested.
  • Publication
    Metadata only
    Deep Fading in a Reverberation Chamber for Wireless Device Testing
    Reverberation chambers (RCs) are a feasible option as test environment for evaluation of wireless devices with integrated antenna as they inherently emulate a Rayleigh fading channel. In this paper the dependency of deep fading on the frequency and position/orientation of an equipment under test (EUT) antenna is evaluated for different numbers of RC steps and loading conditions. The measured data were applied to an exemplary standard for wireless communication. The measurement results are highly repeatable and independent of frequency or position/orientation of the EUT and loading conditions.
  • Publication
    Unknown
    D8.4 Precision Measurement of the Application-dependent Current Consumption of a Wireless Transceiver Chip
    (AMA Service GmbH, 2021-05)
    Döbbert, Thomas Robert 
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    ;
    Modern production concepts generate a demand for reliable, fast and secure wireless communication solutions. Therefore, the current consumption should not increase highly due to additional security operations. This paper shows a principle current measurement method exemplarily of a transceiver for IOLink Wireless protocol. The results show that the current consumption increases by about 316 μA when using hardware-based encryption features, whereby an experimental standard deviation of the mean values of about 15 μA was determined.
  • Publication
    Unknown
    Jetzt kann IO-Link auch funken
    (Beuth Verlag GmbH, 2021-06) ;
    Monaco, Antonio
    ;
  • Publication
    Unknown
    Design and Development of a Roaming Wireless Safety Emergency Stop
    (arXiv, 2024-05-23) ;
    Döbbert, Thomas Robert 
    ;
    ;
    Modern manufacturing is characterized by a high degree of automation, with autonomous systems also frequently being used. In such environments human intervention in the event of malfunctions or maintenance becomes a rare but also necessary task. When human workers are no longer an integral part of the production process, but only intervene when necessary, e.g., in the case of unexpected machine behavior, appropriate safety solutions will become even more important. This work describes a wireless communication system enabling a flexible and safe emergency stop function for multiple automation cells. A portable emergency stop switch allows seamless transition between different wireless cells, ensuring functional safety. The communication protocol combines IO-Link Wireless features with the safety requirements already implemented in IO-Link Safety. Security requirements are fulfilled through encryption and authentication. The IO-Link Wireless roaming functionality is used to extend the system across several manufacturing cells. An experimental setup confirms the suitability of the system for various applications. The results demonstrate the effectiveness of the handover mechanism and evaluate the potential of the system to improve flexibility, availability and security in dynamic production environments. Future extensions could include the use of AI based evaluation of the radio signals for an intelligent cell handover.