Free vibration of co-cured composite stiffened structure embedded with double-layer damping films
WANG Shaoqing1, ZHENG Changsheng3, LIANG Sen2
1.College of Mechanical and Automotive Engineering, Liaocheng University, Liaocheng 252000, China;
2.College of Intelligent Manufacturing, Weifang College of Science and Technology, Weifang 262700, China;
3.College of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266000, China
Abstract：In order to obtain the vibration characteristics of co-cured and stiffened composite structure with double-layer damping membranes embedded, a dynamic analytical model of co-cured and stiffened composite structure with double-layer damping membranes embedded was established on the basis of first-order shear deformation theory. The complex vibration equations are derived by combination of complex modulus theory with composite material mechanics theory. The theoretical solution that satisfies the displacement boundary conditions is obtained by employing Navier method. The present formulation is validated based on the results obtained using the finite element method and parametric studies are then carried out to illustrate the effects of various parameters on its dynamic characteristics. The results show that the natural frequency of the structure increases with the increase of the rib height and width; as the rib height and width increase, the structural loss factor decreases; when the shear modulus of the two damping layers is relatively large, the natural frequency and loss factor of the structure are no longer sensitive to changes in the ratio of its shear modulus.
Key words: Viscoelastic materials; Co-curing; Natural frequency; Loss factor; Stiffened structure
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