Parametric-ROM of Structures with Varying Geometry using Direct Parameterization of Invariant Manifolds

Abstract

This work presents a framework for parametric reduction in FEM, where geometry is controlled by a parameter without altering material properties or stress states. The inverse determinant in the weak form is expanded as a power series, with explicit expressions for the zeroth and first-order terms. External forcing and parameter dependence are incorporated into an enlarged autonomous system, reduced via the direct parameterization of invariant manifolds method and homological equations. The parameter is treated as an additional variable with trivial dynamics, isolated for inclusion in the ROM. This approach enables efficient parametric studies and advances reduced-order modeling in structural dynamics.