Quantifying damping coefficient and attenuation at different frequencies for graphene modified polyurethane by drop ball test

In this study, polyurethane (PU) was modified by direct mixing of carboxyl functionalised graphene (GNP–COOH) referred to as f-GNP, without using any solvent, during in-situ polymerization. a further attempt, the neat PU with f-GNP and hydrophobic silica-based solution (SG) The damping coefficient attenuation capacity (PU), based nanocomposite (PU + f-GNP), SG), together polytetrafluoroethylene (PTFE), high-density polyethylene (HDPE), ultra-high molecular weight (UHMWPE), terephthalate (PET), polyvinyl chloride (PVC) NYLON have been obtained drop ball tests under controlled consistent conditions. results show that among tested materials, Sol-Gel SG) displays greatest attenuations PTFE least. various materials has identified SVD-QR method. This experimental modal analysis method used analyse free response signal system test identify parameters such ratio frequency modes deformation system. 0.5 wt% f-GNP) increased 37% at range 200–300 Hz, 34% 500–600 Hz 32% 700–1000 Hz. developed great potential for protecting leading edge erosion (LEE) wind turbine.