Displacement‐based partitioned equations of motion for structures: Formulation and proof‐of‐concept applications

A new formulation for the displacement‐only partitioned equations of motion for linear structures is presented, which employs: the partitioned displacement, acceleration, and applied force (); the partitioned block diagonal mass and stiffness matrices (); and, the coupling projector (), yielding the...

Full description

Saved in:
Bibliographic Details
Published in:International journal for numerical methods in engineering 2023-11, Vol.124 (22), p.5020-5046
Main Authors: Park, K. C., González, J. A., Park, Y. H., Shin, S. J., Kim, J. G., Maute, K. K., Farhat, C., Felippa, C. A.
Format: Article
Language:English
Subjects:
Component mode synthesis
Coupling
Damage detection
Damage localization
Equations of motion
Iterative methods
Iterative solution
Mass matrix
Mathematical models
Modelling
Optimization
Stiffness matrix
Transient analysis
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A new formulation for the displacement‐only partitioned equations of motion for linear structures is presented, which employs: the partitioned displacement, acceleration, and applied force (); the partitioned block diagonal mass and stiffness matrices (); and, the coupling projector (), yielding the partitioned coupled equations of motion: ). The key element of the proposed formulation is the coupling projector () which can be constructed with the partitioned mass matrix (), the Boolean matrix that extracts the partition boundary degrees of freedom (), and the assembly matrix () relating the assembled displacements () to the partitioned displacements () via . Potential utility of the proposed formulation is illustrated as applied to six proof‐of‐concept problems in an ideal setting: unconditionally stable explicit‐implicit transient analysis, static parallel analysis in an iterative solution mode; reduced‐order modeling (component mode synthesis); localized damage identification which can pinpoint damage locations; a new procedure for partitioned structural optimization; and, partitioned modeling of multiphysics problems. Realistic applications of the proposed formulation are presently being carried out and will be reported in separate reports.
ISSN:0029-5981
1097-0207
DOI:10.1002/nme.7334