Vibration analysis of hole-containing laminated composite combined structures in electric aircraft using an area scan-fitting approach

To address the dynamic analysis requirements of aerospace composite combined plate structures, a novel area scan-fitting method and Rayleigh-Ritz method (ASF-RRM) is proposed for investigating the vibration characteristics of hole-containing aircraft laminated composite combined structure (HALCCS). ASF-RRM can precisely discretize the irregular holes into coordinate points, and then the integral function of the irregular holes is obtained by fitting the mathematical function. Finally, within the theoretical framework of the energy principle, a comprehensive dynamic model containing complex hole geometry, elastic boundary constraints, internal coupling effects and high and low temperature variations is established. The method does not require the use of solving the holes by means of formulas and equations, which simplifies the analysis process. Numerical results obtained from finite element simulations and experimental modal tests confirm the high accuracy and reliability of the ASF-RRM approach. This work provides a novel analytical strategy for the dynamic characterization of complex perforated composite combined structures in aerospace engineering, particularly under coupled high-low temperature-mechanical boundary conditions.