Technology & Engineering - General

The research described in this thesis was inspired by the results of the myCopter project, a European project funded by the European Commission in 2011. The myCopter project's aim was to identify new concepts for air transport that could be used to achieve a...

Submanifold stabilization is the problem of steering a quantity towards a desired submanifold of the space in which it evolves. This is done by controlling the system producing the quantity in an appropriate fashion. In this thesis, methods for explicitly constructing controllers which solve...

The aim of this thesis is to establish a coupled modeling approach to simulate fuel consumption and in-cylinder gas emissions of a passenger car in various driving cycles (NEDC, RDE, WLTP). Combining models of the engine control unit and the mechanical vehicle powertrain with...

In this dissertation, novel Content-based Microscopic Image Analysis (CBMIA) methods, including Weakly Supervised Learning (WSL), are proposed to aid biological studies. In a CBMIA task, noisy image, image rotation, and object recognition problems need to be addressed. To this end, the first approach is...

This thesis contributes to the development of a cooperative control theory for homogeneous and heterogeneous multi-agent systems consisting of identical and non-identical dynamical agents, respectively. The goal is to explain fundamental effects of non-identical agent dynamics on the behavior of a distributed system and,...

Orbital debris is becoming an increasing problem for space flight missions. New satellite launches, explosions, collisions and other events cause a steady rise in the number of objects orbiting the Earth. It is therefore important to determine the future development of the object population,...

TInfluences of external error sources on measurements of room acoustic parameters Aby Martin Guski DCorrect and precise measurements of room acoustic parameters are of fundamental importance for subjective room impression characterization and for the physical description of the sound field. This thesis investigates external...

This work aims at developing a numerical simulation method, Soft PARticle Code (SPARC). The term textit{soft} emphasizes that no boundaries between particles are defined and every particle possesses a support consisting of a set of adjacent particles. The polynomial interpolation/approximation method is utilized for...

Barodesy is a constitutive model for granular materials. It is based on proportional strain and stress paths and the asymptotic behaviour of soil. In this work, an existing relation for proportional strain paths and proportional stress paths is further developed. A modification of barodesy...

Amongst the mammalian producer cell lines, the Chinese hamster ovary (CHO) cell lines are of predominant importance in biopharmaceutical production. Thus, novel factors increasing overall productivity are sought and bear the potential to reduce the unit costs of a production process. Furthermore, the current...

These Lecture Notes provide an introduction to the modern theory of classical finite-dimensional integrable systems. The first chapter focuses on some classical topics of differential geometry. This should help the reader to get acquainted with the required language of smooth manifolds, Lie groups and...

The expression of recombinant proteins from Escherichia coli along with the possibility of their subsequent secretion into the extracellular space is a highly desirable feature due to reasons like easier downstream purification and protection of the product from degradation by the host. This feature...

This work considers the problem of identifying the fault in a faulty dynamical system on the basis of the system's input and output signals only. For this purpose, a model-based method for the design of diagnostic tests which consist of specific input signals and...

Nowadays, distributed software development has become more common. In a distributed project setting, managing experience is even more crucial than in a co-located project. Problems like ineffective communication, lack of awareness and trust and restrictive information flow policies impede experience exchange and raise the...

The content of this book reflects the results of the work carried out during my dissertation. For the first time the functionality of a GNSS receiver has been combined with the information gathered from a time-code receiver. For high efficient signal processing the architecture...

IT systems have a high impact on organizations and businesses today and are a key to globalization. Evolution of complexity calls for changes in the way these systems are built and managed. As a consequence, a paradigm shift towards Model-Driven Engineering and Policy-Based Management...

Nowadays, angiography is the gold standard for the visualization of the morphology of the cardiac vasculature and cardiac chambers in the interventional suite. Up to now, high resolution 2-D X-ray images are acquired with a C-arm system in standard views and the diagnosis of...

Starting from physical theory, this work develops a novel framework for the acoustic simulation of sound radiation by loudspeakers and sound reinforcement systems. First, a theoretical foundation is derived for the accurate description of simple and multi-way loudspeakers using an advanced point-source "CDPS" model...

These Lecture Notes provide an introduction to classical statistical mechanics. The first part presents classical results, mainly due to L. Boltzmann and J.W. Gibbs, about equilibrium statistical mechanics of continuous systems. Among the topics covered are: kinetic theory of gases, ergodic problem, Gibbsian formalism,...

Event-based control is a means to restrict the feedback in control loops to event time instants that are determined by a well-defined triggering mechanism. The aim of this control strategy is to adapt the communication over the feedback link to the system behavior. In...

Diese Arbeit stellt ein Analyserahmenwerk vor, welches zur Uberprufung des korrekten Verhaltens eines technischen Systems eingesetzt wird. Im Fokus steht dabei die praktische Anwendung im industriellen Umfeld. Hierfur werden die verwendeten Formalismen weitestehend durch domanenspezifische Beschreibungsmoglichkeiten substituiert, um somit den Anwender beim Entwurfs- und...

Structure-borne sound sources are vibrational sources connected in some way to the building structure. The mechanical excitation of the building structure leads to sound radiation. This is an important source of annoyance in modern light-weight buildings. The prediction of the sound pressure level from...

Spatial information describes types, relations, and various different aspects of space. This PhD thesis investigates how modular ontologies can model spatial information. Particularly, different perspectives on space are analyzed. A perspectival framework for spatial ontology modules is presented that allows the integration and combination...

The virtual development of future Spark Ignition (SI) engine combustion processes in three-dimensional Computational Fluid Dynamics (3D-CFD) demands for the integration of detailed chemistry, enabling - additionally to the 3D-CFD modelling of flow and mixture formation - the prediction of fuel-dependent SI engine combustion...

This book presents novel methods of fault-tolerant control theory in a discrete-event system framework. Nondeterministic input/output automata are used to model nominal and faulty technological systems. The main contributions are the following: Control design method for discrete-event systems Fault modeling technique for actuator, sensor...

In der vorliegenden Arbeit wird ein Fehlerdiagnosekonzept mit einer signalbasierten On-Board Datenerfassung und einer modellbasierten Off-Board Fehlerdiagnose vorgeschlagen. Desweiteren wird exemplarisch gezeigt, dass verschiedene Leckagen eines elektropneumatischen Schaltaktors auch unter Verzicht auf zusatzliche Drucksensoren grundsatzlich diagnostizierbar sind. Das neue Diagnosekonzept ergibt sich aus dem...

Steel is an important material in various applications. It has a complex material behaviour which is, in addition to elastic and plastic effects, basically characterised by phase transitions. An important feature in this context is the transformation-induced plasticity, which arises during phase transitions and...

How do humans perceive communicative gesture behavior in robots? Although gesture is a crucial feature of social interaction, this research question is still largely unexplored in the field of social robotics. The present work thus sets out to investigate how robot gesture can be...

Flight simulators provide an effective, efficient, and safe environment for practising flight-critical manoeuvres without requiring a real aircraft. In general, high-performance full flight simulators are used for training tasks that require simulator motion, although low-cost motion systems have been proposed for certain training tasks...

In spite of progress in the development of alternative powertrain systems and energy sources, the internal combustion and all its derivates still are and will be the main powertrain for automobiles. In SI-engines, several approaches compete with each other like the controlled auto ignition...

There is interest in a substitution of conventional diesel fuel by alternative hydrocarbons. For example natural gas can be converted into liquid hydrocarbons using the Fischer-Tropsch process. Resulting Gas-To-Liquid (GTL) fuels may have considerable advantages with respect to their combustion. GTL fuels are appropriate...

High temperature PEMFCs (HT PEMFCs), operating at 120 C - 200 C are rather new and offer tremendous advantages. For instance fuel cells operating at > 100 C reduce issues related to water management substantially. Circulating excess heat energy from such fuel cells into...

Event-based control is a means to reduce the information exchange over the feedback link in networked control systems in order to avoid an overload of the digital network which generally degrades the performance of the overall control loop. This thesis presents a novel state-feedback...

A generic approach is proposed in this work that automatically constructs suitable calculation models from a herefore invented formal description language. Two positive effects arise from that: firstly, all inherently and explicitly contained complexity of Safety Instrumented Systems is identified once and condensed into...

In this thesis, three fundamental issues of mobile robotics are addressed: self-localization, mapping, and area coverage. Self-localization denotes the robot's task to determine its position with respect to a given map. Mapping is the procedure to create such a map of the environment. In...

This thesis deals with natural slope-movements of the earthflow-type. The main thematic focus of the work is on the investigation of the so-called source areas located in the upper parts of the affected slopes. On the basis of two present-day and socio-economically relevant case...

In a systems theoretic context, the terms 'consensus' and 'synchronization' both describe the property that all individual systems in a group behave asymptotically identical, i.e., output or state trajectories asymptotically converge to a common trajectory. The objective of the present thesis is an improved...

Aktuell gibt es grosse neue Herausforderungen an die Hersteller von Automatisierungslosungen, um die vom Markt geforderte Flexibilitat gewahrleisten zu konnen. So mussen zum Einen Spezifikationstechniken entwickelt und angewendet werden, die der Komplexitat verteilter Systeme gerecht werden und nicht schon in der Phase der Spezifizierung...

The robustness of various cooperative control schemes on large scale networked systems with respect to heterogeneous communication and coupling delays is investigated. The presented results provide delay-dependent and delay-independent conditions that guarantee consensus, rendezvous, flocking, and synchronization in different classes of multi-agent systems (MAS)....

Magnetic shape-memory alloys (MSMAs) are smart materials which show in single crystalline form a magnetic field induced plastic and recoverable deformation of up to 10 %. Ni-Mn-Ga is the as most prominent representative. The shape change of MSMAs is based on the motion of...

B-Spline and NURBS techniques have already been successfully used in Isogeometric Analysis which is a method for directly integrating CAD models in numerical simulations. Our purpose is to improve existing techniques to enhance the efficiency. First, we use local B-Spline subdivisions and knot insertions...

The automation of cross-organizational business processes is one of the most important trends of the information age. Instead of a tight integration however, collaborating organizations rather strive for a loose coupling of their information systems. Supporting this objective, the Architecture of Interoperable Information Systems...

The reactions involving aromatic hydrocarbons play a crucial role in the combustion chemistry for the formation and growth of polyaromatic hydrocarbons (PAHs). In this work, the thermal decomposition of the single ring aromatics benzene, phenyl and ortho-benzyne have been investigated behind reflected shock waves...

Fuel cells provide the direct conversion of chemical into electrical energy. Therefore they are regarded as an attractive concept for numerous technical applications. However, the success of fuel cell systems on the market is still limited as in many cases they are economically not...

Various models have been proposed for the prediction of the necessary support pressure at the face of a shallow tunnel. To assess their quality, the collapse of a tunnel face was modelled with small scale model tests at single gravity. The evolution of the...

In 2008, the first of three DAAD PhD-Summer Academies on human-machine Interaction in networked systems and multimodal interfaces was hosted at the University of Chile in Santiago de Chile. It is focused on three topics: Multimodal Human-Machine Interaction in Different Application Scenarios Modeling Human-Machine...

Communication networks are part of our societies' vital infrastructures, and the services they provide are fundamental to our daily work and private lives. The networks are constantly evolving, which cause high uncertainty about current and future network usage and traffic demands. An important trend...

The 5th Polish-German Teletraffic Symposium (PGTS '08) takes place in Berlin. It continues a series of events held every two years (Dresden 2000, Gd'ansk 2002, Dresden 2004, Wroclaw 2006). PGTS has been created to fasten the cooperation between the telecommunications and teletraffic communities of...

In this work, properties of short-range synthetic aperture radar imaging, with a special emphasis on wide-beam antennas, are evaluated analytically and by means of numerical simulations. Figures of merit considering system and scenario parameters for judging the processing results are defined, optimum antenna patterns...

Since the 1950s, Sound and Music Computing (SMC) research has had a profound impact on the development of culture and technology in our post-industrial society. SMC research approaches the whole sound and music communication chain from a multidisciplinary point of view. By combining scientific,...