Comparative theoretical and experimental analysis of vibration damping performance in multilayer constrained layer damping structures: Aluminium versus glass fiber reinforced polymer

Abstract

This study investigates the dynamic behavior of multilayer Constrained Layer Damping (CLD) structures, specifically focusing on constraining layers made of aluminum and Glass Fiber Reinforced Polymer (GRP). Numerical simulations are compared with experimental results using the finite element method (FEM) and the widely used Ross–Kerwin–Ungar (RKU) model to achieve this. Experimental modal analysis is conducted on a vibration shaker to validate the FEA findings. The research reveals valuable insights into the damping performance of aluminum and GRP as constraining layers. Notably, aluminum demonstrates superior damping properties, particularly in the higher frequency range (ultimate loss factor 0.2), while GRP exhibits better-damping characteristics in the lower frequency range (ultimate loss factor 0.13). These results underscore the significance of considering the frequency-dependent behavior of materials when selecting appropriate constraining layers. By shedding light on the dynamic behavior and damping performance of multilayer CLD structures with different constraining layers, this study contributes to the effective mitigation of vibrations in various engineering applications. This endeavor will enhance the understanding and application of constraining layer materials for effective structural vibration control, paving the way for improved engineering solutions.