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Integration von Niedertemperaturwärme in thermische Produktionsprozesse der Molkeverarbeitung
(kassel university press, 2018)
Die Trocknung von Molkereiprodukten gehört zu den energieintensivsten Prozessen der Nahrungs- und Getränkemittelindustrie. Eine Möglichkeit zur Reduktion von energiebedingten Emissionen bietet die Substitution der Beheizung mit Dampf durch Abwärme, Wärmepumpe und der Kraft-Wärme-Kopplung. Die hierzu notwendige Umstellung von Dampf auf eine Versorgungsstruktur mit Niedertemperaturwärme – unterhalb von 100 °C – benötigt die passenden Abnehmer. Diese Arbeit untersucht mit Hilfe der Pinch-Methodik und Simulationsmodellen ...
Buch
Residual stress analysis in polymer materials using the hole drilling method - basic principles and applications
(kassel university press, 2019)
Residual stresses are mechanical stresses in materials free of external loads, moments or temperature gradients. These residual stresses form a self-equilibrated and inhomogeneous stress state, which is then superimposed upon external stresses applied to the material. A distinction is made between macroscopic residual stresses, which are comparable to loading stresses, and microscopic residual stresses, which take the inhomogeneous microstructure of materials into account. In polymer materials, residual stresses are ...
Buch
Beitrag zur numerischen Berechnung rotierender Strukturen im Strömungsfeld hochbelasteter axialer Turboverdichter und Analyse der Entstehungsmechanismen
(kassel university press, 2019)
Das Ziel dieser Arbeit bestand darin, das Phänomen der Rotierenden Instabilität, welches experimentell an dem Ringgitterwindkanal der Universität Kassel bestätigt wurde, mit Hilfe numerischer Simulation abzubilden und weiter zu untersuchen.
Buch
Control of Stochastic Hybrid Systems based on Probabilistic Reachable Set Computation
(kassel university press, 2018)
This thesis proposes an algorithmic controller synthesis based on the computation of probabilistic reachable sets for stochastic hybrid systems. Hybrid systems consist in general of a composition of discrete and continuous valued dynamics, and are able to capture a wide range of physical phenomena. The stochasticity is considered in form of normally distributed initial continuous states and normally distributed disturbances, resulting in stochastic hybrid systems.The reachable sets describe all states, which are ...
Buch
Close range 3D thermography: real-time reconstruction of high fidelity 3D thermograms
(kassel university press, 2018)
Infrared thermography enables the non-contact measurement of an object’s surface temperature and presents the results in form of thermal images. The analysis of these images provides valuable information about an object’s thermal state. However, the fidelity of the thermal images strongly depends on the pose of the thermographic camera with respect to the surface. 3D thermography offers the possibility to overcome this and other limitations that affect conventional 2D thermography but most 3D thermographic systems ...
Buch
Robust Model Predictive Control for Large-Scale Manufacturing Systems subject to Uncertainties
(kassel university press, 2018)
Large scale manufacturing systems are often run with constant process parameters although continuous and abrupt disturbances influence the process. To reduce quality variations and scrap, a closed-loop control of the process variables becomes indispensable. In this thesis, a modeling and control framework for multistage manufacturingsystems is developed, in which the systems are subject to abrupt faults, such as component defects, and continuous disturbances. In this context, three main topics are considered: the ...
Buch
Hierachical and Cooperative Control of Complex Distributed Systems
(kassel university press, 2018)
In this thesis, a theory of hierarchical and cooperative feedback control for spatially distributed, physically interconnected systems is developed. A particular requirement is that the resulting control laws are suitable for a distributed implementation, meaning that the subsystems are equipped with local controllers and exchange information via a communication network. Distributed control schemes steadily gain practical significance, since an ever increasing number of technical systems, like power networks or ...
Buch
Modelling, Control and Stability Analysis of Photovoltaic Systems in Power System Dynamic Studies
(kassel university press, 2019)
This thesis investigates the impact of: i) the low voltage ride-through and dynamic voltage support capability; ii) the active current recovery rate; iii) the local voltage control; and iv) the plant-level voltage control of large-scale photovoltaic systems on short-term voltage stability and fault-induced delayed voltage recovery as well as transient and frequency stability. The power system dynamic performance is analysed using state-of-the-art methods, such as phasor mode time-domain simulations and the calculation ...
Buch
Zum Einfluss von Temperatur und Feuchtigkeit auf die elektrische Festigkeit von thermoplastischem Kunststoff, Silikongel und einem daraus resultierenden Schichtisoliersystem
(kassel university press, 2019)
Im Fokus dieser Arbeit steht der Einsatz von technischem Kunststoff, Silikongel und dem Isolationssystem aus beiden Isolierstoffen für elektrotechnische Anwendungen.
Buch
Off-Board Car Diagnostics Based on Heterogeneous, Highly Imbalanced and High-Dimensional Data Using Machine Learning Techniques
(kassel university press, 2019)
Data-driven maintenance poses many challenges. Four very important of them, namely coping with a high dimensional and heterogeneos feature space, the highly imbalanced data sets, the Remaining Useful Lifetime (RUL) prediction of monitored parts based on short yet variable length timeseries, and already large but steadily further increasing data set size are identified. Each of the challenges is dealt with in one chapter. Novel techniques are designed, implemented, validated, and compared to existing approaches based ...