复合材料层合板边界条件的声辐射特性研究OA

For the acoustic radiation characteristics of composite laminates under different boundary conditions,this paper systematically analyzes the effects of unidirectional,symmetric and asymmetric layup modes on structural vibration and acoustic radiated power under four-faceted fixed,simply supported and free boundary conditions based on delamination theory and finite element analysis,combined with the theory of acoustic radiation modes.The interac-tion mechanism between layup order and boundary constraint is revealed by deriving the sensitivity formula of sound power for laying mode and boundary condition.The results show that the fixed-support boundary significantly en-hances the low-frequency acoustic radiation,while the sound power is the lowest at the free boundary.Antisymmetric layering can effectively suppress low frequency acoustic radiation under fixed support conditions,while unidirectional layering has the best noise reduction effect in high frequency band.