Publikationen

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2021

Capturing shrinkage and neck growth with phase field simulations of the solid state sintering.

Ivannikov, V., Thomsen, F., Ebel, T., & Willumeit-Römer, R. (2021). Capturing shrinkage and neck growth with phase field simulations of the solid state sintering. Modelling and Simulation in Materials Science and Engineering, 29(7). http://doi.org/10.1088/1361-651X/ac1f87
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Thomsen, Fritz
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2021

Journal Article

Vladimir Ivannikov

Fritz Thomsen

Thomas Ebel

Regine Willumeit-Römer
Automizing the manual link in maritime supply chains? An analysis of twistlock handling automation in container terminals

Kugler, M., Brandenburg, M., & Limant, S. (2021). Automizing the manual link in maritime supply chains? An analysis of twistlock handling automation in container terminals. Maritime Transport Research, 2, 100017. http://doi.org/https://doi.org/10.1016/j.martra.2021.100017

Abstract

The study at hand elaborates on potential barriers, prerequisites and optimization potentials for the automation of the twistlock handling process in container terminals. A case analysis enlightens latest automation developments of this essential task in container transport. Eight experts from different organizations in maritime logistics and seaport operations were interviewed in a qualitative multiple-case research design. The interviews were evaluated by qualitative-quantitative content analysis with MAXQDA software. Automated twistlock handling systems are hardly implemented, although they represent the missing link between other container handling technology in the automated container transport. The study reveals that most implementation barriers consist of technological issues, followed by economic and strategic barriers. The study identifies implementation strategies and their key success and shows that safety improvements and cost reductions are major benefits of this automation. An innovation framework for this field of automation is conceptualized as scientific contribution. Practical implications include recommendations for relevant stakeholders in container logistics.
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Brandenburg, Marcus

Fachbereich

Fachbereich 4: Wirtschaft

Fachbereich 1: Maschinenbau, Verfahrenstechnik und Maritime Technologien
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2021

Journal Article

Michael Kugler

Marcus Brandenburg

Sander Limant

Container logistics

Maritime logistics

Process automation

Twistlock handling

case study

Expert interviews
Grid Services and Stress Reduction with a Flywheel in the Rotor of a Wind Turbine

Jauch, C. (2021). Grid Services and Stress Reduction with a Flywheel in the Rotor of a Wind Turbine. Energies, 14. http://doi.org/10.3390/en14092556

Abstract

Wind power penetration increases in most grids and the sizes of wind turbines increase. This leads to increasingly tough requirements, which are imposed on wind turbines, both from the grid as well as from economics. Some of these partially contradictory requirements can only be satisfied with additional control mechanisms in the wind turbines. In this paper, such a mechanism, i.e., a hydraulic–pneumatic flywheel system in the rotor of a wind turbine, is discussed. This flywheel system supports a wind turbine in providing grid services such as steadying the power infeed, fast frequency response, continuous inertia provision, power system stabilization, and low voltage ride-through. In addition, it can help mitigate the stress on the mechanical structure of a wind turbine, which results from varying operating points, imbalances in the rotor, gravitation that acts on the blades, in-plane vibrations, and emergency braking. The study presented in this paper is based on simulations of a publicly available reference wind turbine. Both the rotor blade design as well as the design of the flywheel system are as previously published. It is discussed how the aforementioned grid services and the stress reduction mechanisms can be combined. Finally, it is concluded that such a flywheel system broadens the range of control mechanisms of a wind turbine substantially, which is beneficial for the grid as well as for the wind turbine itself.
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Jauch, Clemens

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Fachbereich 2: Energy and Life Science
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2021

Journal Article

Prof. Dr. Clemens Jauch
Financial performance and firm efficiency of automotive manufacturers and their suppliers A longitudinal data envelopment analysis

Brandenburg, M., & Hahn, G. J. (2021). Financial performance and firm efficiency of automotive manufacturers and their suppliers A longitudinal data envelopment analysis. Logistics Research, 14(1), 26. http://doi.org/10.23773/2021_01

Abstract

A data envelopment analysis (DEA) is presented to assess evolutions of firm efficiency and financial performance in automotive supply chains. A sample of 32 decision-making units (DMUs), 17 globally operating original equipment manufacturers (OEMs) and 15 key suppliers from the automotive industry, is in focus of this analysis in which cost levels and capital requirements are put into relation to sales growth and profit. Cost of goods sold, operating capital, and net fixed assets represent the financial input of a company while sales growth and earnings before interest and taxes (EBIT) reflect the financial output. The financial performance of a firm is indicated by its efficiency, calculated by an input-oriented variable returns to scale model. A multiple linear regression analysis reveals which operational performance factors are predictors of financial performance. A longitudinal DEA approach that covers the years from 2003 to 2017 is chosen to reveal performance evolutions over time. In order to analyze the stability of relationships between efficient firms (peers) and inefficient ones (followers) over time, changes in the performance relationship network are assessed in a graph-theoretic approach. In this study, geographical and structural specifics of DMU groups are taken into account. The study reveals similarities and differences between OEMs and their suppliers regarding the importance of value drivers and detects periods of performance losses and recovery from the global economic crisis.
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Brandenburg, Marcus
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2021

Journal Article

Marcus Brandenburg

Gerd Hahn

Automotive industry

Data Envelopment Analysis

Financial performance

Supply networks

2020

oemof.solph- A model generator for linear and mixed-integer linear optimisation of energy systems

Krien, U., Schönfeldt, P., Launer, J., Hilpert, S., Kaldemeyer, C., & Pleßmann, G. (2020). oemof.solph- A model generator for linear and mixed-integer linear optimisation of energy systems. Software Impacts, 6, 100028. http://doi.org/10.1016/j.simpa.2020.100028 (Original work published 2026)
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Fachbereich 2: Energy and Life Science
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2020

Journal Article

Uwe Krien

Patrik Schönfeldt

Jann Launer

Simon Hilpert

Cord Kaldemeyer

Guido Pleßmann
TESPy: Thermal Engineering Systems in Python

Witte, F., & Tuschy, I. (2020). TESPy: Thermal Engineering Systems in Python. Journal of Open Source Software, 5, 2178. http://doi.org/10.21105/joss.02178 (Original work published 2026)
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Witte, Francesco

Tuschy, Ilja

Fachbereich

Fachbereich 2: Energy and Life Science
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2020

Journal Article

Francesco Witte

Ilja Tuschy
Robust gain scheduling baseline controller for floating offshore wind turbines

Lemmer, F., Yu, W., Schlipf, D., & Cheng, P. W. (2020). Robust gain scheduling baseline controller for floating offshore wind turbines. Wind Energy, 23, 17–30. http://doi.org/10.1002/we.2408 (Original work published 2026)
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Schlipf, David
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2020

Journal Article

Frank Lemmer

Wei Yu

David Schlipf

Po Cheng
Shifted thermal extraction rates in large Borehole Heat Exchanger array - A numerical experiment

Chen, S., Witte, F., Kolditz, O., & Shao, H. (2020). Shifted thermal extraction rates in large Borehole Heat Exchanger array - A numerical experiment. Applied Thermal Engineering, 167, 114750. http://doi.org/10.1016/j.applthermaleng.2019.114750 (Original work published 2026)
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Witte, Francesco

Fachbereich

Fachbereich 2: Energy and Life Science
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2020

Journal Article

Shuang Chen

Francesco Witte

Olaf Kolditz

Haibing Shao
Multi-objective investment optimization for energy system models in high temporal and spatial resolution

Prina, M. G., Casalicchio, V., Kaldemeyer, C., Manzolini, G., Moser, D., Wanitschke, A., & Sparber, W. (2020). Multi-objective investment optimization for energy system models in high temporal and spatial resolution. Applied Energy, 264, 114728. http://doi.org/10.1016/j.apenergy.2020.114728 (Original work published 2026)
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Fachbereich 2: Energy and Life Science
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2020

Journal Article

Matteo Prina

Valeria Casalicchio

Cord Kaldemeyer

Giampaolo Manzolini

David Moser

Alexander Wanitschke

Wolfram Sparber
Spatial task solving on tablets: analysing mental and physical rotation processes of 12–13-year olds

Wetzel, S., Bertel, S., Montag, M., & Zander, S. (2020). Spatial task solving on tablets: analysing mental and physical rotation processes of 12–13-year olds. Educational Technology Research and Development, 68(1), 363–381. http://doi.org/10.1007/s11423-019-09699-8

Abstract

Spatial skill assessment and training are promising fields of application for tablets, as touch-based interaction can prime and support mental transformations of spatial knowledge. We report on a study with 49 secondary school students who used our iPad app to solve mental and physical rotation tasks. During physical rotation, students were able to rotate 3D stimuli using touch interaction. Results show specific similarities (e.g., regarding angular disparity effects) as well as differences between mental and physical conditions, such as for task success, mental effort, efficiency; all to the advantage of the physical condition. 12–13-year olds can benefit from these advantages without previous task training, whereas previous research showed this to be different for younger students. In a second step, our analysis compares low and high achievers regarding physical rotation behaviour and motivational variables, including expected success. The results lay grounds for constructing individualized, tablet-based training apps for spatial skills.
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Bertel, Sven

Abteilung/Einrichtung

CIVU – Center for Interaction, Visualization and Usability

Fachbereich

Fachbereich 3: Information und Kommunikation
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2020

Journal Article

Stefanie Wetzel

Sven Bertel

Michael Montag

Steffi Zander

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2021

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