Comparison of modelling approaches of sandwich structures

The data shows the results of free vibration frequencies derived from 4 different models of periodic sandwich structure: x the tolerance model of double-plate system with Winkler's type core, x the tolerance model of double-plate system with Vlasov's type core, x the tolerance model of a single multi-layered thin plates, x the tolerance model of sandwich structure based on the broken line hypothesis. Additionally, a free vibration frequencies of FEM model were enclosed, which can serve as a benchmark for the analysis of correctness of assumptions made in every each presented models.