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Optimal sensor placement for joint parameter and state estimation problems in large-scale dynamical systems with applications to thermo-mechanics

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Abstract

We consider large-scale dynamical systems in which both the initial state and some parameters are unknown. These unknown quantities must be estimated from partial state observations over a time window. A data assimilation framework is applied for this purpose. Specifically, we focus on large-scale linear systems with multiplicative parameter-state coupling as they arise in the discretization of parametric linear time-dependent partial differential equations. Another feature of our work is the presence of a quantity of interest different from the unknown parameters, which is to be estimated based on the available data. In this setting, we employ a simplicial decomposition algorithm for an optimal sensor placement and set forth formulae for the efficient evaluation of all required quantities. As a guiding example, we consider a thermo-mechanical PDE system with the temperature constituting the system state and the induced displacement at a certain reference point as the quantity of interest.

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Acknowledgements

The authors would like to thank four anonymous reviewers for their constructive criticism which helped improve the paper.

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Correspondence to Ilka Riedel.

Appendix: Specific Form of \(N'(0)\)

Appendix: Specific Form of \(N'(0)\)

$$\begin{aligned} \left[\begin{array}{lll} 1/4&\quad\frac{L}{\ell } \, (x_{2z}-x_{4z})&\quad\frac{L}{\ell } \, (x_{4y}-x_{2y}) \\ \frac{L}{\ell } \, (x_{4z}-x_{2z})&\quad1/4&\quad\frac{L}{\ell } \, (x_{2x}-x_{4x}) \\ \frac{L}{\ell } \, (x_{2y}-x_{4y})&\quad\frac{L}{\ell } \, (x_{4x}-x_{2x})&\quad1/4 \end{array}\right] {\varvec{u}}({\varvec{x}}_1) \\ +\left[\begin{array}{lll} 1/4&\quad\frac{L}{\ell } \, (x_{3z}-x_{1z})&\quad\frac{L}{\ell } \, (x_{1y}-x_{3y}) \\ \frac{L}{\ell } \, (x_{1z}-x_{3z})&\quad1/4&\quad\frac{L}{\ell } \, (x_{3x}-x_{1x}) \\ \frac{L}{\ell } \, (x_{3y}-x_{1y})&\quad\frac{L}{\ell } \, (x_{1x}-x_{3x})&\quad1/4 \end{array}\right] {\varvec{u}}({\varvec{x}}_2) \\ + \left[\begin{array}{lll} 1/4&\quad\frac{L}{\ell } \, (x_{4z}-x_{2z})&\quad\frac{L}{\ell } \, (x_{2y}-x_{4y}) \\ \frac{L}{\ell } \, (x_{2z}-x_{4z})&\quad1/4&\quad\frac{L}{\ell } \, (x_{4x}-x_{2x}) \\ \frac{L}{\ell } \, (x_{4y}-x_{2y})&\quad\frac{L}{\ell } \, (x_{2x}-x_{4x})&\quad1/4 \end{array}\right] {\varvec{u}}({\varvec{x}}_3) \\ + \left[\begin{array}{lll} 1/4&\quad\frac{L}{\ell } \, (x_{1z}-x_{3z})&\quad\frac{L}{\ell } \, (x_{3y}-x_{1y}) \\ \frac{L}{\ell } \, (x_{3z}-x_{1z})&\quad1/4&\quad\frac{L}{\ell } \, (x_{1x}-x_{3x}) \\ \frac{L}{\ell } \, (x_{1y}-x_{3y})&\quad\frac{L}{\ell } \, (x_{3x}-x_{1x})&\quad1/4 \end{array}\right] {\varvec{u}}({\varvec{x}}_4) \end{aligned}$$

We refer the reader to Herzog and Riedel (2015) for more details.

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Herzog, R., Riedel, I. & Uciński, D. Optimal sensor placement for joint parameter and state estimation problems in large-scale dynamical systems with applications to thermo-mechanics. Optim Eng 19, 591–627 (2018). https://doi.org/10.1007/s11081-018-9391-8

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