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- 2020 (3) (remove)
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- bone remodeling (2)
- density change (2)
- finite element method (2)
- Elektrizitätsversorgung (1)
- Laufwasserkraftwerk (1)
- Metropolregion Nürnberg (1)
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- Fakultät Maschinenbau und Versorgungstechnik (3) (remove)
Modeling the evolution of bone density is relevant for understanding, simulation and possible prediction of bone response to external and internal influences. In this work we present a formulation for the bone density evolution process that takes into account not only the commonly considered mechanical stimulus, but, as novelty, also the influence of the availability of nutrients and hormones, with its implementation pursued within the finite element method. A simple uni-axial extension test is used to illustrate and compare our novel model against the classical approach. The results of the proposed modified model are promising for application to real-life problems.
A number of previous studies have investigated the possibilities of modelling the change in density of bones. Remodeling can be formulated at the constitutive or the kinematic level. In this work we introduce a formulation for the density growth process which takes not only the mechanical stimulus into account but also the influence of age on the evolution of growth. We demonstrate the implementation in the context of the finite element method. This novel approach is illustrated for a simple uniaxial extension test and is verified against previous numerical results. Moreover, two further physiologically motivated examples are performed. The results of the proposed modified model show excellent agreement with comparable results from literature and are promising for the application to real-life problems.
Basierend auf den erneuerbaren Energien Solarenergie, Windenergie, Biomasse und Laufwasser wird eine zukünftige Stromversorgung der Europäischen Metropolregion Nürnberg modelliert. Mit drei gängigen Speicheransätzen wird eine möglichst ökonomische Prognose gestellt. Schwerpunkt der Betrachtung sind Laufwasserkraftwerke und deren Modernisierungs- und Ausbaupotenzial. Nach Analyse des Ist-Zustandes werden mögliche technische Modernisierungen genannt und auf deren Stromentstehungskosten eingegangen. Das Ausbaupotenzial wird anhand einer Jahresdauerlinie erläutert.