NONLINEAR DYNAMIC ANALYSIS OF THE STEEL-RUBBER VIBRATION ISOLATORS WITH PERFORATION

The paper presents a comparative study of nonlinear dynamic analyses of perforated and non-perforated steel–rubber vibration isolators. Particular emphasis is placed on the nonlinear response of rubber, incorporating hyperelasticity (via the Mooney–Rivlin model) and viscoelasticity (through a Prony series), under static preloading conditions. The computational methodology is implemented in Python, integrating the finite element method (FEM), the Newmark-β time integration scheme for dynamic equilibrium, and a Newton–Raphson iterative solver enhanced with line search.