Options
Comments on truncation errors for polynomial chaos expansions
Publikationstyp
Journal Article
Date Issued
2018
Sprache
English
Author(s)
Journal
Volume
2
Issue
1
Start Page
169
End Page
174
Citation
IEEE Control Systems Letters 2 (1): 169-174 (2018)
Publisher DOI
Scopus ID
Publisher
IEEE
Methods based on polynomial chaos expansion allow to approximate the behavior of systems with uncertain parameters by deterministic dynamics. These methods are used in a wide range of applications, spanning from simulation of uncertain systems to estimation and control. For practical purposes the exploited spectral series expansion is typically truncated to allow for efficient computation, which leads to approximation errors. Despite the Hilbert space nature of polynomial chaos, there are only a few results in the literature that explicitly discuss and quantify these approximation errors. This letter derives error bounds for polynomial chaos approximations of polynomial and non-polynomial mappings. Sufficient conditions are established, which allow investigating the question whether zero truncation errors can be achieved and which series order is required to achieve this. Furthermore, convex quadratic programs, whose argmin operator is a special case of a piecewise polynomial mapping, are studied due to their relevance in predictive control. Several simulation examples illustrate our findings.
Subjects
Model predictive control
Polynomial chaos expansion
Stochastic systems
Stochastic uncertainties
DDC Class
004: Computer Sciences
510: Mathematics