This　paper　presents　the　effect　of　the　inherent　material　damping　of　aluminium　facings　and　fibre　reinforced　polymer　(FRP)　core　composite　sandwich　panel　on　vibro-acoustics　and　sound　transmission　loss　characteristics.　The　modal　strain　energy　method　is　used　to　calculate　the　modal　damping　ratio　at　each　mode.　To　determine　the　forced　vibration　response,　the　harmonic　analysis　is　carried　out.　From　the　kinematic　continuity　of　velocity　of　the　structure　and　the　acoustic　particle　velocity　at　the　surface,　the　sound　power　level　is　calculated.　From　the　results,　it　is　revealed　that　19.89　dB　of　overall　sound　power　level　is　reduced　by　including　the　modal　damping　ratio　in　the　finite　element　modeling.　Further,　it　is　noticed　that　by　replacing　the　aluminium　plate　to　aluminium　face　sheet　with　an　FRP　core　sandwich　panel,　the　overall　sound　power　level　of　11.76 dB　and　10.78 dB　is　reduced　based　on　the　same　volume　and　weight　analysis　respectively.　©　2020,　Springer-Verlag　GmbH　Germany,　part　of　Springer　Nature.