Global　dynamics　of　forcedly　excited　composite　panels　with　free　layer　damping　treatment　in　subsonic　flow　near　the　first-order　critical　velocity　is　investigated.　Hamilton＇s　principle　is　implemented　to　derive　the　PDE　of　such　fluid-structure　interaction　systems.　Then　the　governing　equation　is　transformed　into　a　discretized　nonlinear　gyroscopic　system　via　assumed　modes　and　Galerkin＇s　method.　The　canonical　transformations　and　normal　form　theory　are　applied　to　reduce　the　equations　of　motion　to　near-integrable　Hamiltonian　standard　forms　considering　zero　to　one　internal　resonance.　The　Energy-Phase　method　is　employed　to　demonstrate　the　existence　of　chaotic　dynamics　by　identifying　the　existence　of　multi-pulse　jumping　orbits　in　the　perturbed　phase　space.　In　both　the　Hamiltonian　and　the　dissipative　perturbation　case,　the　homoclinic　trees　which　describe　the　repeated　bifurcations　of　multi-pulse　solutions　are　demonstrated.　In　the　case　of　dissipative　perturbation,　the　existence　of　generalized　Silnikov＇s　type　of　orbits　which　are　homoclinic　to　fixed　points　on　the　slow　manifold　are　examined　and　the　parameter　region　for　which　the　dynamical　system　may　exhibit　chaotic　motions　in　the　sense　of　Smale　horseshoes　are　obtained　analytically.　The　present　research　illustrates　that　the　existence　of　multi-pulse　homoclinic　orbits　can　provide　a　mechanism　for　how　energy　flow　from　the　high-frequency　mode　to　the　low-frequency　mode.　The　global　results　are　finally　interpreted　in　terms　of　the　physical　traveling　wave　motion　of　such　gyroscopic　continua.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.