Dynamic Characteristics And Optimization Of The Embedded Co-cured Perforated Damping Layer Composite Structure

The light-weight，high-stiffness，great-damping composite damping structure hasbeen widely used in high technical fields such as the aerospace and aeronauticalindustries etc. In order to improve the dynamical performance of the embeddedco-cured composite damping structure， the perforated damping structure and griddamping structure are presented in detail. The dynamic characteristics versus thesestructural geometric parameters are investigated by theoretical analysis, optimizationand experimental measure, and the general rule of viscoelastic material distribution isproposed. The main innovations are listed as the following.(1) The modal analysis and friction and wear experiments verify that the dynamicperformances and the friction wear characteristics of the embedded co-cured perforateddamping layer composite structure are better than those of the embedded co-curedcomposite damping structure.(2) By the combination of the finite element analysis and the modal strain energymethod, the model loss factor of the embedded co-cured perforated damping layercomposite structure is studied deeply, the simulation results are compared withexperiment data in order to validate the feasibility and the validity of the methodpresented in this paper, and the effects of the damping layer thickness, diameter andspacing for a perforated damping structure and the thickness, edge length, spacing, edgelength ratio and spacing ratio for a grid damping structure on dynamic characteristics ofthe embedded co-cured composite damping structure are studied further.(3) On the basis of the finite element analysis results above-mentioned, the geneticalgorithm is presented to optimize the embedded co-cured perforated damping layercomposite structure. With and without the consideration of the stiffness and dampingsensitivities versus the geometric parameters of the perforated damping layer, thedamping material distribution after optimizing is proposed, respectively.(4) By the sensitive analysis of the damping loss factor, the combination of finiteelement analysis with the modal strain energy method is proposed to optimize the embedded co-cured composite damping structure, and the general rule of viscoelasticmaterial distribution is presented in detail.