High-frequency vibration analysis of honeycomb plate based on EFEA: Numerical calculation, experiment and damping loss factor identification

To address the demand for high-frequency vibration response analysis of aluminum honeycomb sandwich plates, this study conducts an in-depth investigation through a combination of numerical simulations and experimental testing, and propose a novel method for identifying the damping loss factor of aluminum honeycomb sandwich plates. Equivalent parameters of the aluminum honeycomb sandwich plate were calculated based on equivalent plate theory and honeycomb plate theory. Three EFEA models were established: a plate-equivalent EFEA model, an orthotropic EFEA model, and an average-wavenumber-equivalent EFEA model. The accuracy of these models was validated by comparing numerical results with analytical solutions. Subsequently, a finite difference method was employed to develop a theoretical framework for energy density testing corresponding to the three EFEA models. The validity of this testing theory was confirmed by numerical verification. Furthermore, guided by the principle of minimizing the error between experimental and numerical results, a damping loss factor identification method for aluminum honeycomb sandwich plates was proposed. The method was further refined by introducing a comprehensive influence factor. The results demonstrate that, the orthotropic EFEA model accurately and effectively captures the high-frequency vibration response of aluminum honeycomb sandwich plates in both numerical simulations and experimental tests. Additionally, the proposed method identifies the damping loss factor of the structure more effectively when incorporating a comprehensive influence factor.