A system-level interface sampling and reduction method for component mode synthesis with varying parameters

Seunghee Cheon, Soobum Lee, Jaehun Lee

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents a new interface sampling and reduction method for varying parameters within the framework of the component mode synthesis (CMS) method. In the conventional interpolation-based parametric reduced-order model (IB-PROM) based on CMS, reduced subsystems are synthesized, and interface degrees-of-freedom are reduced via the secondary eigenvalue analysis in the online stage, which is essential to obtain highly reduced system matrices. However, it inhibits rapid parameter updating and requires extra computational resources in the online stage. In the present study, the pre-reduced interface sampling method is proposed by synthesizing substructures and reducing the interface before beginning the online stage. The interface solution is obtained through offline and online adaptation, likewise the procedure of computing the interior solution of previous studies. Additionally, congruence transformations are applied to each reduced interface, which is mandatory for interpolating symmetric positive definite matrices with respect to a new input parameter. As a result, the online performance of IB-PROM is greatly enhanced, showing rapid and near real-time adaptations to the variations in system parameters.

Original languageEnglish
Article number128778
JournalApplied Mathematics and Computation
Volume476
DOIs
StatePublished - 1 Sep 2024

Keywords

  • Component mode synthesis
  • Interface sampling and reduction
  • Interpolation
  • Parametric reduced-order models
  • System-level parameters

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