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Teil eines Buches
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Prädiktive simulationsgestützte Optimierung von Kältemaschinen im Verbund
(kassel university press, 2017)
Prerequisite for an efficient cooling energy system is the knowledge and the optimal combination of different operating conditions of individual compression chillers. The performance of cooling systems depending on its part load performance and its condensing temperature are often unknown. Recorded energy data remains unused and manufacturers' data differs significantly from the real performance. For this purpose, manufacturer and real data are combined and continuously adapted to form partial load curve models. A ...
Aufsatz
Constitutive modeling of nonlinear reversible and irreversible ferromagnetic behaviors and application to multiferroic composites
(2016-03-10)
The coupling of magnetic and mechanical fields due to the constitutive behavior of a material is commonly denoted as magnetostrictive effect. The latter is only observed with large coupling coefficients in ferromagnetic materials, where coupling is caused by the rotation of the domains as a result of magnetic (Joule effect) or mechanical (Villari effect) loads.
However, only a few elements (e.g. Fe, Ni, Co, and Mn) and their compositions exhibit such a behavior. In this article, the constitutive modeling of nonlinear ...
Aufsatz
Mixed-mode crack tip loading and crack deflection in 1D quasicrystals
(2016)
Quasicrystals (QC) are a new class of materials besides crystals and amorphous solids and have aroused much attention of researchers since they were discovered. This paper presents a generalized fracture theory including the J-integral and crack closure integrals, relations between J1, J2 and the stress intensity factors as well as the implementation of the near-tip stress and displacement solutions of 1D QC. Different crack deflection criteria, i.e. the J-integral and maximum circumferential stress criteria, are ...
Aufsatz
Integration of Heat Pump Storage Systems in Manufacturing Systems via Data Farming and Monte Carlo Simulation
(2019)
The electrification of industrial energy demand is essential for effective climate protection and a successful energy transition. In production systems with fluctuating heating and cooling demands, heat pumps can make a significant contribution to electrification and increased efficiency in a demand-oriented production with automated standby operation. In order to dimension a suitable heat pump storage system, well-founded statistical information about the production system is required. For the creation of stochastic ...
Buch
Schlussbericht zum Projekt SimCast – Simulationsgestützte Prognose der Dauer von Logistikprozessen
(2018)
Für den kundenindividuellen Anlagenbau in der Unikat- und Kleinserienfertigung sind die termingerechte Fertigstellung, Lieferung und Inbetriebnahme einer Anlage entscheidende Wettbewerbsfaktoren. Bei der Planung neuer Projekte kann das bisher aus Projekten erworbene Wissen allerdings nicht 1:1 in ein neues Projekt übertragen werden, da die Parameter und die Dauer der Montage- und Logistikprozesse von dem jeweils zu montierenden Bauteil abhängig sind. Aus diesem Grund wird diese Prozessdauer heute nur grob abgeschätzt; ...
Dissertation
Simulation-based optimization of solar thermal systems
(2018)
In this PhD thesis application of numerical methods to simulation-based optimization of solar thermal systems both in the planning process and in operation is investigated. The optimization process starting from definition of a target function and specification of optimization parameters, moving forward with application of an optimization algorithm and ending up by sensitivity analysis at the found optimum, is described in detail. A hybrid genetic CHC – binary search algorithm is proposed and applied. As a combination ...
Konferenzveröffentlichung
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Structured Eyetracking-based Requirements Validation with the Help of Virtual Prototypes
(INEGI/Faculdade de Engenharia Universidade do Porto, 2017)
Customer requirements form the basis of every product development project. Incomplete requirements and lack of involvement of customers are the main factors for the failure of a product at the buyer's market (Hull et al. 2011). The Quality Function Deployment (QFD) describes a common method for translating customer requirements into product features. For this purpose, the QFD provides various matrices for the prioritization and quantification of the requirements, through the various phases of the product development. ...
Aufsatz
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A Comparison Study of Liquid Natural Rubber (LNR) and Liquid Epoxidized Natural Rubber (LENR) as the Toughening Agent for Epoxy
(2013)
Rubber-toughened epoxy resins were prepared using the mechanical stirring method and molded into samples by compression molding. The aim of this study is to modify the brittleness of the epoxy matrix by adding discrete rubbery phases to improve the toughness properties. Liquid natural rubber (LNR) and liquid epoxidized natural rubber (LENR) were used as toughening agents in the epoxy resin to compare the properties of the modified networks. The mechanical and thermal properties have been studied to observe the effect ...
Konferenzveröffentlichung
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Anforderungsvalidierung unter Nutzung echtzeit simulierter virtueller Prototypen zur Verbesserung der Produktqualität
(FAU University Press, 2017)
Im Rahmen der Anforderungsermittlung werden verschiedene Methoden, wie Befragungs‐ und Beobachtungstechniken eingesetzt, um die bewussten Kundenanforderungen zu erfassen. Verborgene (unbewusste) Kundenanforderungen werden dabei meist nicht berücksichtigt. Aus erhobenen Kundenanforderungen lassen sich z.B. mit einer QFD die späteren Produktmerkmale ableiten. Aufgrund der unscharfen Kundenanforderungslage kommt es bei dem entwickelten Produkt oft zu einer Abweichung von den vom Kunden gewünschten Eigenschaften. Jede ...
Aufsatz
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Crack path predictions in fiber reinforced composites
(2017-09-06)
Composite materials exhibit beneficial features compared to conventional engineering material, e.g. a comparable strength and a reduced weight at the same time. To fully exploit these beneficial properties within technical structures, fracture mechanical concepts must be taken into account. The global fracture behavior in composite materials is related to the local delamination at interfaces between matrix and inclusion as well as the local fracture behaviors of the constituents. Because of their structure, the global ...