Abstract
The identification of the mechanical parameters of the viscoelastic core layer is of great significance for the modeling and damping design of the constrained layer damping (CLD) composite structure. In this study, based on the measured frequency vibration response of a CLD plate, an inverse approach was developed to identify the aforementioned parameters. Then, on the basis of considering both the viscoelastic material damping and the remaining equivalent viscous damping, the equation of motion of the CLD plate under base excitation was established and a method to obtain the vibration response was also presented. Further, a matching calculation based on sensitivity was proposed, to achieve the identification of the mechanical parameters. Finally, a CLD aluminum plate with a ZN_1 viscoelastic core layer was chosen to demonstrate the proposed method. In addition, the identification results were also introduced into the vibration response analysis and the rationality of the identified parameters were verified by comparing the vibration responses obtained by theoretical calculations and the experiment.
Highlights
Constrained layer damping (CLD) treatment uses a viscoelastic layer, laid onto the host structure surface covered by a stiff and thin constraining layer, and it can produce energy dissipation relying on the shear deformation of the viscoelastic layer [1]
The features of the presented method are as follows: (1) the cantilever plate-shaped specimen attached with CLD was chosen to carry out the identification of the viscoelastic material parameters; (2) both the material damping and the remaining equivalent viscous damping were considered in the created analysis model; (3) the data at the resonance point and non-resonance point can both be used to identify the viscoelastic parameter; and (4) the frequency responses obtained by sweeping under base excitation were mainly used to identify the parameters
The identification of the mechanical parameters of the viscoelastic core layer is of great significance for the modeling of a viscoelasticlly damped structure and vibration reduction design
Summary
Constrained layer damping (CLD) treatment uses a viscoelastic layer, laid onto the host structure surface covered by a stiff and thin constraining layer, and it can produce energy dissipation relying on the shear deformation of the viscoelastic layer [1]. Most identification studies obtained the frequency response function of the composite beam by the hammer test and inversely identified the mechanical parameters of viscoelastic material. The features of the presented method are as follows: (1) the cantilever plate-shaped specimen attached with CLD was chosen to carry out the identification of the viscoelastic material parameters; (2) both the material damping and the remaining equivalent viscous damping were considered in the created analysis model; (3) the data at the resonance point and non-resonance point can both be used to identify the viscoelastic parameter; and (4) the frequency responses obtained by sweeping under base excitation were mainly used to identify the parameters. In view of the fact that the viscoelastic core layer is mainly subjected to shear stress, theinverse fractional derivative modelthree to be basic identified can beadescribed [15]:theoretical modeling, The method contains contents: vibrationastest, and a matching calculation.
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