Vibro-Acoustic Response Analysis of Novel Auxetic Honeycomb Sandwich Panels with Polyurea Coating
摘要
This study innovatively integrates a star-shaped structure with a concave hexagonal structure to design a novel honeycomb core. Building on this, a new type of auxetic honeycomb sandwich panel (AHSP), treated with a polyurea coating, is conceived to enhance its acoustic-vibration performance. A numerical model of the new auxetic honeycomb sandwich panel was established in ABAQUS, and its accuracy was verified. Using the finite element (FE) method, its natural frequency, damping loss factor (DLF), vibration acceleration level (VAL), sound transmission loss (STL), and sound pressure level (SPL) were simulated and compared with those of conventional AHSPs without a polyurea coating. The research findings demonstrate that both the specific location of the polyurea coating and the geometric morphology of the honeycomb core can effectively promote vibration reduction and noise suppression in the sandwich panels. Among the configurations, the honeycomb sandwich structure with symmetrically configured PML-A faceplates exhibited significantly superior performance in vibration attenuation and sound isolation compared to asymmetric structures. When the polyurea layer thickness (PLT) reached 6 mm, the reduction in the vibration acceleration amplitude of the sandwich panel was most significant, and the average STL increased by 8.5%. Furthermore, the acoustic-vibration performance of the sandwich panel reached its optimal level when the geometric tilt angle of the honeycomb core was set to − 45°.