TY - JOUR
T1 - Non-intrusive reduced-order modeling for nonlinear structural systems via radial basis function-based stiffness evaluation procedure
AU - Lee, Jonggeon
AU - Park, Younggeun
AU - Lee, Jaehun
AU - Cho, Maenghyo
N1 - Publisher Copyright:
© 2024 Elsevier Ltd
PY - 2024/11/1
Y1 - 2024/11/1
N2 - This paper presents a new radial basis function-based stiffness evaluation procedure developed in the framework of nonlinear, and non-intrusive reduced-order modeling. For structural nonlinear systems, a stiffness evaluation procedure (STEP) and its variants use a cubic polynomial for evaluating nonlinear stiffness coefficients and have been developed as non-intrusive reduced-order models (ROM) using data obtained from numerical simulation model. In this paper, we propose using a radial-basis function (RBF) instead of the cubic polynomials on evaluating nonlinear stiffnesses. As the RBF shows a good performance for approximating nonlinearities, the efficiency and robustness of the ROM are substantially enhanced in a non-intrusive manner. In particular, the proposed R-STEP ROM can be constructed for elastoplastic analysis without any additional treatments. Various numerical examples verify the performance of the proposed R-STEP ROM comparing with the STEP methods and commercial finite element software, ABAQUS.
AB - This paper presents a new radial basis function-based stiffness evaluation procedure developed in the framework of nonlinear, and non-intrusive reduced-order modeling. For structural nonlinear systems, a stiffness evaluation procedure (STEP) and its variants use a cubic polynomial for evaluating nonlinear stiffness coefficients and have been developed as non-intrusive reduced-order models (ROM) using data obtained from numerical simulation model. In this paper, we propose using a radial-basis function (RBF) instead of the cubic polynomials on evaluating nonlinear stiffnesses. As the RBF shows a good performance for approximating nonlinearities, the efficiency and robustness of the ROM are substantially enhanced in a non-intrusive manner. In particular, the proposed R-STEP ROM can be constructed for elastoplastic analysis without any additional treatments. Various numerical examples verify the performance of the proposed R-STEP ROM comparing with the STEP methods and commercial finite element software, ABAQUS.
KW - Elastoplastic analysis
KW - Non-intrusive reduced-order model
KW - Nonlinear structural systems
KW - Radial basis function
KW - Stiffness evaluation procedure
UR - http://www.scopus.com/inward/record.url?scp=85200824191&partnerID=8YFLogxK
U2 - 10.1016/j.compstruc.2024.107500
DO - 10.1016/j.compstruc.2024.107500
M3 - Article
AN - SCOPUS:85200824191
SN - 0045-7949
VL - 304
JO - Computers and Structures
JF - Computers and Structures
M1 - 107500
ER -