Anisotropic design and its damping analysis of laminated damped structure

An anisotropic design is introduced to the laminated damped plates. The damping characteristic and its control mechanism of laminated anisotropic damped plates were analysed theoretically. The results indicate that it is feasible to carry out the optimization design of laminated anisotropic damped plates for obtaining the maximum loss factor. An important index for evaluating the effect of reducing vibration decrease is the loss factor of the structure system. Taking a semi-infinite plate as an example, a lot of composite structures were calculated by varying different layers and layer orientation angles. At the same time, after the loss factor was defined as the objective function, the optimization design was carried out for obtaining the maximum loss factor with constrained conditions such as the layer angle, frequency and layer thickness. The numerical results show that using compliant inner layering appears to have more effects on damping than using stress coupling, and in the inherent frequency higher than the fundamental mode, the compliant inner layering laminates have significantly greater loss factors.