Abstract
Computational approaches to systems involving random fields or stochastic processes have to discretise these fields or processes. This produces– when compared to the deterministic case – many variables in the computation, resulting in a very high-dimensional problem. Based on the conviction that the essential stochastic properties of the system are close to some – albeit unknown – lower dimensional manifold, one may try to approximate the response of the system by a data-sparse representation.
The basis for this sparse representation has to be found in the course of the computation. One first approach is to exploit the natural tensor product structure between basis vectors describing the physical/deterministic behaviour and a basis describing the stochastic response. There are two steps involved here: one is to find a good basis for the physical description, and the other to find/compute a good basis for the stochastic part. One well-known example is the Karhunen-Loève expansion, resulting from the eigenvalue analysis of the covariance. One problem is of course that the covariance of the response is not known beforehand. We will discuss on how to approximate the basis along with the solution.
The singular value decomposition, which is very closely related to the Karhunen-Loève expansion, is optimal in that it uses the minimal number of dyadic products. Furthermore, the stochastic part of this product is itself again naturally an element of a tensor product with potentially many factors, containing functions of just one random variable. This fact can be additionally exploited, and also be used to obtain an adaptive approximation of the stochastic part.
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Matthies, H.G., Zander, E. (2011). Sparse Representations in Stochastic Mechanics. In: Papadrakakis, M., Stefanou, G., Papadopoulos, V. (eds) Computational Methods in Stochastic Dynamics. Computational Methods in Applied Sciences, vol 22. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9987-7_13
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