Modal analysis and experimental verification of a seaplane based on a piecewise elastic model

Large Seaplane Typically Use Piecewise Elastic Models for Modal Analysis and Scale Model Testing, but There Are Discrepancies Between the Dynamic Response of the Scale Model and the Full-Scale Vehicle. To Validate the Test Results of the Scale Model, Finite Element Modal Analyses Were Conducted on the Fuselage, Wings, and Full Aircraft. Additionally, Ground Resonance Tests Were Performed on the Scale Model to Obtain the Low-Order Mode Shapes and Natural Frequencies. By Comparing the Finite Element Simulation Results of the Full Aircraft with the Experimental Results of the Scale Model in the Horizontal and Vertical Directions, the Similarity of Dynamic Responses Between the Scale Model and the Full-Scale Aircraft Was Verified. Furthermore, the Causes of Data Discrepancies Between the Simulation and Test Methods Were Analyzed. The Results of the Modal Analysis and Experimental Verification Indicate That the Wave Sliding Load Characteristics Obtained from the Scale Model in the Towing Tank Provide a Reasonable Reference for the Full Aircraft's Wave Testing.