34 Works

Risk management for green transport corridors

Meike Schröder & Gunnar Prause
The Green Corridor concept represents a cornerstone in the development and implementation of integrated and sustainable transport solutions based on trans-nationality, multi-modality and a high involvement of public and private stakeholders, including the political level. Hence, the implementation and management of a Green Transport Corridor is connected with a variety of risks due to the high level of complexity and the strong frame conditions of the concept. E.g. stakeholders' violation of ecological and sustainable obligations...

Nutzenbasierte Betriebsführung von Niederspannungs-Verteilnetzen mittels Online-Optimierung

Hanko Ipach, Leonard Fisser, Christian Becker & Andreas Timm-Giel
Wir stellen einen Betriebsführungsregler für Niederspannungsnetze vor, der eine Vielzahl dezentraler Energieanlagen (DEA) in Echtzeit koordiniert, um die Nutzung der erneuerbaren Energieerzeugung zu maximieren. Der Regler verwendet ein LTE-Funknetzwerk, das die DEA mit dem Verteilnetzbetreiber verbindet. In unserem Ansatz werden den DEA Nutzenfunktionen zugewiesen und die Nutzenmaximierung wird als Optimierungsproblem formuliert. Das Optimierungsproblem wird durch einen iterativen Algorithmus gelöst, der inkrementelle Anpassungen der Leistungssollwerte der DEA in Richtung des Optimums vornimmt. Um den Netzzustand im...

Primary and recurrent repair of incisional hernia based on biomechanical considerations to avoid mesh-related complications

Regine Nessel, Thorsten Löffler, Johannes Rinn, Philipp Lösel, Samuel Voß, Vincent Heuveline, Matthias Vollmer, Johannes Görich, Yannique Ludwig, Luai Al-Hileh & Friedrich Kallinowski
Aim: Mechanical principles successfully guide the construction of polymer material composites in engineering. Since the abdominal wall is a polymer composite augmented with a textile during incisional hernia repair we ask: can incisional hernia be repaired safely and durably based on biomechanical principles? Material and Methods: Repair materials were assessed on a self-built bench test using pulse loads to elude influences on the reconstruction of the abdominal wall. Tissue elasticity was analyzed preoperatively as needed...

New insights from locally resolved hydrodynamics in stirred cell culture reactors

Fabian Freiberger, Jens Budde, Eda Ateş, Michael Schlüter, Ralf Pörtner & Johannes Möller
The link between hydrodynamics and biological process behavior of antibody-producing mammalian cell cultures is still not fully understood. Common methods to describe dependencies refer mostly to averaged hydrodynamic parameters obtained for individual cultivation systems. In this study, cellular effects and locally resolved hydrodynamics were investigated for impellers with different spatial hydrodynamics. Therefore, the hydrodynamics, mainly flow velocity, shear rate and power input, in a single- and a three-impeller bioreactor setup were analyzed by means of...

Piston-based material extrusion of Ti-6Al-4V feedstock for complementary use in metal injection molding

Lennart Waalkes, Jan Längerich, Philipp Imgrund & Claus Emmelmann
Piston-based material extrusion enables cost savings for metal injection molding users when it is utilized as a complementary shaping process for green parts in small batch sizes. This, however, requires the use of series feedstock and the production of sufficiently dense green parts in order to ensure metal injection molding-like material properties. In this paper, a methodological approach is presented to identify material-specific process parameters for an industrially used Ti-6Al-4V metal injection molding feedstock based...

Partial least squares structural equation modeling (PLS-SEM) using R

Joseph F. Hair, G. Tomas M. Hult, Christian M. Ringle, Marko Sarstedt, Nicholas Patrick Danks & Soumya Ray

Development of combined load spectra for offshore structures subjected to wind, wave, and ice loading

Moritz Braun, Alfons Dörner, Kane F. ter Veer, Tom Willems, Marc Seidel, Hayo Hendrikse, Knut V. Høyland, Claas Fischer & Sören Ehlers
Fixed offshore wind turbines continue to be developed for high latitude areas where not only wind and wave loads need to be considered but also moving sea ice. Current rules and regulations for the design of fixed offshore structures in ice-covered waters do not adequately consider the effects of ice loading and its stochastic nature on the fatigue life of the structure. Ice crushing on such structures results in ice-induced vibrations, which can be represented...

Praxisbericht: Fachwissenschaft und Berufspraxis verbunden durch kollaboratives Peer Teaching im Studium des Lehramts an Beruflichen Schulen

Katharina Bartsch, Ake Ewald & Dirk Herzog
Die Fachsystematik der beruflichen Fachrichtungen im Studium des Lehramts an Beruflichen Schulen steht in einem anhaltenden Widerspruch zu der Handlungsorientierung an den Schulen. Jedoch ist es aufgrund der Anforderungen an einzelne Fachrichtungen nicht immer einfach, diesen aufzulösen. In dieser Studie wird ein didaktisches Konzept vorgestellt, welches mittels eines Peer-Teaching-Ansatzes die Fachsystematik der fachwissenschaftlichen Lehrinhalte durch auf den späteren Lehrerberuf bezogene Lehrmethoden ergänzt. Das Konzept wurde in zwei Lehrveranstaltungen der beruflichen Fachrichtung Metalltechnik in Hamburg zur...

Design and implementation of molecular circuits for mitigating genetic diseases

Ana Karen Velázquez Sánchez
RNA-basierte Tools (u.a. synthetische sRNAs) wurden mit dem Ziel entworfen und entwickelt, neuartige molekulare Schaltkreise sowie therapeutische und diagnostische Ansätze für Nonsense-Mutations-assoziierte Krankheiten, insbesondere Mukoviszidose bereitzustellen. Dabei wurden zelluläres Computing zusammen mit de-novo-Ansätzen zur Genregulation in Hinblick auf Diagnose und Behandlung von Mukoviszidose verfolgt. Die vorgeschlagenen Diagnose-Regeln basieren auf Boolescher Logik und werden mittels miRNAs ausgeführt.

Collaborative robot assisted smart needle placement

Maximilian Neidhardt, Stefan Gerlach, Max-Heinrich Laves, Sarah Latus, Carolin Stapper, Martin Gromniak & Alexander Schlaefer
Needles are key tools to realize minimally invasive interventions. Physicians commonly rely on subjectively perceived insertion forces at the distal end of the needle when advancing the needle tip to the desired target. However, detecting tissue transitions at the distal end of the needle is difficult since the sensed forces are dominated by shaft forces. Disentangling insertion forces has the potential to substantially improve needle placement accuracy.We propose a collaborative system for robotic needle insertion,...

How morphological computation shapes integrated information in embodied agents

Carlotta Langer & Nihat Ay
The Integrated Information Theory provides a quantitative approach to consciousness and can be applied to neural networks. An embodied agent controlled by such a network influences and is being influenced by its environment. This involves, on the one hand, morphological computation within goal directed action and, on the other hand, integrated information within the controller, the agent's brain. In this article, we combine different methods in order to examine the information flows among and within...

Indirectly additive manufactured deformable bladder model for a pelvic radiotherapy phantom

Marie Wegner, Elisabetta Gargioni & Dieter Krause

Jahresbericht des Präsidiums 2020

Das Jahr 2020 war ein Jahr mit vielen Veränderungen für die TU Hamburg. Ganz besonders stand es unter dem Zeichen der Covid-19-Pandemie, die uns vor ganz neue Herausforderungen stellte, wie wir arbeiten, lehren und lernen. Die TU musste und muss sich auch schwierigeren finanziellen Rahmenbedingungen stellen, die alle Mitglieder betreffen. Aber 2020 war auch ein Jahr mit schönen Erfolgen für uns, mit interessanten neuen Impulsen durch neuberufene Professorinnen und Professoren und mit vielen (Wachstums-)Plänen für...

Sending multiple packets per guaranteed time slot in IEEE 802.15.4 DSME : analysis and evaluation

Florian Meyer, Ivonne Mantilla-González & Volker Turau
Coping with bursty traffic is a common yet challenging task in the industrial Internet of Things (IoT). For example, 6LoWPAN is a standard that defines the integration of LoWPAN with IPv6, by fragmenting large IPv6 packets into several smaller MAC‐layer packets. Therefore, it is necessary to envision message delivery mechanisms, which provide support for highly varying traffic. In this paper, we analyze sending multiple packets per guaranteed time slot (GTS) in IEEE 802.15.4 DSME to...

Assembly specific viewpoint generation as part of a simulation based sensor planning pipeline

Johann Gierecker & Thorsten Schüppstuhl
Manual assembly often lacks process monitoring since information feedback is only generated by the worker. Machine vision systems thereby offer the possibility to automatically derive process states without intervening the work in progress. Recent approaches in the field of sensor planning and advances in sensor simulation allow automatic machine vision design but simultaneously require detailed knowledge of relevant object features which is difficult to obtain. Therefore, this paper introduces a novel method to derive task-specific...

Solid waste management in the context of a circular economy in the MENA region

Safwat Hemidat, Ouafa Achouri, Loubna El Fels, Sherien Elagroudy, Mohamed Hafidi, Benabbas Chaouki, Mostafa Ahmed, Isla Hodgkinson & Jinyang Guo
Solid waste management in most MENA countries is characterized by lack of planning, improper disposal, inadequate collection services, inappropriate technologies that suit the local conditions and technical requirements, and insufficient funding. Therefore, waste management is mainly limited to collection, transportation, and disposal. As the circular economy has recently been given high priority on the MENA region’s political agenda, all MENA member states are seeking to move away from old-fashioned waste disposal, “waste management”, towards a...

Analysis of the operation of industrial trucks based on position data

Jakob Schyga, Hendrik Rose, Johannes Hinckeldeyn & Jochen Kreutzfeldt
Indoor-Lokalisierungssysteme (IPSs) können einen wichtigen Beitrag zur Analyse und Optimierung von innerbetrieblichen Transportprozessen leisten. Das übergeordnete Ziel dieser Arbeit besteht darin, zu untersuchen, wie Lokalisierungsdaten zur Analyse des Betriebs von Flurförderzeugen in Lagern genutzt werden können. Dies wird durch die Vorstellung eines Systemkonzeptes zur Analyse des Betriebs von Flurförderzeugen erreicht, welches ausschließlich die Verfügbarkeit von Positionsdaten voraussetzt. Das Konzept besteht aus einem Signalverarbeitungsschemas zur Ableitung kinematischer Daten und drei Analysemethoden – Monitoring, Flächenanalyse und Bewegungsanalyse....

Three-dimensional finite element analysis of contact problem in dry friction clutches

Laith A. Sabri, Nadica Stojanovic, Adolfo Senatore, Muhsin Jaber Jweeg, Azher M. Abed & Oday Ibraheem Abdullah
We present an investigation through numerical analysis (FEM) of the solution of the contact problem in friction clutch systems during engagement manoeuver. The case of high contact pressure between the sliding elements of a clutch system (flywheel, friction clutch and pressure plate) has been also considered. A finite element model of a dry friction clutch system (single disc) to estimate the distributions of the contact pressure between the contact elements of the clutch system under...

Towards synthetic AI training data for image classification in intralogistic settings

Daniel Schoepflin, Karthik Iyer, Martin Gomse & Thorsten Schüppstuhl
Obtaining annotated data for proper training of AI image classifiers remains a challenge for successful deployment in industrial settings. As a promising alternative to handcrafted annotations, synthetic training data generation has grown in popularity. However, in most cases the pipelines used to generate this data are not of universal nature and have to be redesigned for different domain applications. This requires a detailed formulation of the domain through a semantic scene grammar. We aim to...

Nanoporous gold : a hierarchical and multiscale 3D test pattern for characterizing X-ray nano-tomography systems

Emanuel Larsson, Doğa Gürsoy, Francesco De Carlo, Erica Lilleodden, Malte Storm, Fabian Wilde, Kaixiong Hu, Martin Müller & Imke Greving
Full-field transmission X-ray microscopy (TXM) is a well established technique, available at various synchrotron beamlines around the world as well as by laboratory benchtop devices. One of the major TXM challenges, due to its nanometre-scale resolution, is the overall instrument stability during the acquisition of the series of tomographic projections. The ability to correct for vertical and horizontal distortions of each projection image during acquisition is necessary in order to achieve the effective 3D spatial...

A simulation driven development framework for parallel kinematics

Lukas Bath & Thorsten Schüppstuhl
This work presents a novel software tool to design, analyze and simulate parallel robots. It considers any desired constraints, requirements and load scenarios, while being able to be used by non-experts. This is comprehensively shown for one kind of the Gough/Stewart-platform kinematics class. First, the inverse kinematics is derived, which allows for the interactive exploration of the workspace, as well as other properties, prior to building the machine. In addition, the forward kinematics are implemented...

OC6 Phase Ia : CFD simulations of the free-decay motion of the DeepCwind semisubmersible

Lu Wang, Amy Robertson, Jason Jonkman, Jang Kim, Zhi-Rong Shen, Arjen Koop, Adrià Borràs Nadal, Wei Shi, Xinmeng Zeng, Edward Ransley, Scott Brown, Martyn Hann, Pranav Chandramouli, Axelle Viré, Likhitha Ramesh Reddy, Xiang Li, Qing Xiao, Beatriz Méndez López, Guillén Campaña-Alonso, Sho Oh, Hamid Sarlak Chivaee, Stefan Netzband, Hyunchul Jang & Kai Yu
Currently, the design of floating offshore wind systems is primarily based on mid-fidelity models with empirical drag forces. The tuning of the model coefficients requires data from either experiments or high-fidelity simulations. As part of the OC6 (Offshore Code Comparison Collaboration, Continued, with Correlation, and unCertainty (OC6) is a project under the International Energy Agency Wind Task 30 framework) project, the present investigation explores the latter option. A verification and validation study of computational fluid...

Knowledge-based decision support for concept evaluation using the extended impact model of modular product families

Erik Greve, Christoph Fuchs, Bahram Hamraz, Marc Windheim, Christoph Rennpferdt, Lea-Nadine Schwede & Dieter Krause
The design of modular product families enables a high external variety of products by a low internal variety of components and processes. This variety optimization leads to large economic savings along the entire value chain. However, when designing and selecting suitable modular product architecture concepts, often only direct costs are considered, and indirect costs as well as cross-cost center benefits are neglected. A lack of knowledge about the full savings potential often results in the...

What’s important for relationship management? : the mediating roles of relational trust and satisfaction for loyalty of cooperative banks’ customers

Svenja Damberg, Manfred Schwaiger & Christian M. Ringle
Building on the corporate reputation model, this study investigates the drivers of customer-based corporate reputation. We consider two corporate reputation dimensions (i.e., the cognitive dimension competence and the affective dimension likeability, and their effects on customer satisfaction and loyalty). Adapting the model to the banking sector, we theoretically extend this model by reasoning that customer satisfaction and relational trust are mediators of the relationship between the two corporate reputation dimensions and loyalty. Studying a sample...

Multiple glassy dynamics of a homologous series of triphenylene-based columnar liquid crystals – A study by broadband dielectric spectroscopy and advanced calorimetry

Arda Yildirim, Christina Krause, Patrick Huber & Andreas Schönhals
Hexakis(n-alkyloxy)triphenylene) (HATn) consisting of an aromatic triphenylene core and alkyl side chains are model discotic liquid crystal (DLC) systems forming a columnar mesophase where the molecules of HATn self-assemble and stack up in columns exhibiting one-dimensional high charge carrier mobility along the column axes. Here, a homologous series of HATn with different length of the alkyl chain (n=5,6,8,10,12) is investigated using differential scanning calorimetry (DSC), broadband dielectric spectroscopy (BDS) and advanced calorimetric techniques including fast...

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