Towards a Data-Driven Bilinear Koopman Operator for Controlled Nonlinear Systems and Sensitivity Analysis

Damien Guého, Puneet Singla

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A Koopman operator is a linear operator that can describe the evolution of the dynamical states of any arbitrary uncontrolled dynamical system in a lifting space of infinite dimension. In practice, analysts consider a lifting space of finite dimension with a guarantee to gain accuracy on the state prediction as the order of the operator increases. For controlled systems, a bilinear description of the Koopman operator is necessary to account for the external input. Additionally, bilinear state-space model identification is of interest for two main reasons: some physical systems are inherently bilinear and bilinear models of high dimension can approximate a broad class of nonlinear systems. Nevertheless, no well-established technique for bilinear system identification is available yet, even less in the context of Koopman. This paper offers perspectives in identifying a bilinear Koopman operator from data only. Firstly, a bilinear Koopman operator is introduced using subspace identification methods for the accurate prediction of controlled nonlinear systems. Secondly, the method is employed for sensitivity analysis of nonlinear systems where it is desired to estimate the variation of a measured output given the deviation of a constitutive parameter of the system. The efficacy of the methods developed in this paper are demonstrated on two nonlinear systems of varying complexity.

Original languageEnglish (US)
Title of host publicationDynamic Data Driven Applications Systems - 4th International Conference, DDDAS 2022, Proceedings
EditorsErik Blasch, Frederica Darema, Alex Aved
PublisherSpringer Science and Business Media Deutschland GmbH
Number of pages8
ISBN (Print)9783031526695
StatePublished - 2024
Event4th International Conference on Dynamic Data Driven Applications Systems, DDDAS 2022 - Cambridge, United States
Duration: Oct 6 2022Oct 10 2022

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume13984 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Conference4th International Conference on Dynamic Data Driven Applications Systems, DDDAS 2022
Country/TerritoryUnited States

All Science Journal Classification (ASJC) codes

  • Theoretical Computer Science
  • General Computer Science

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