In order to improve the stealth performance of ships,this paper carries out research on the long base struc-ture of marine sitting piers.Based on the combination of finite element method and engineering estimation formula,the study of the base impedance calculation method,base position change on the impedance value,base three-way impedance charac-teristics,increase the base sealing plate and other impact on the base input impedance.The study shows that the base imped-ance calculation,whether using single-point excitation,multi-point excitation or surface load excitation has a small effect on the calculation results.The magnitude of the base impedance value is not only related to the excitation position but also to the existence of strong boundary conditions at the excitation position.When calculating the three-way impedance of the base,the magnitude of the impedance in different directions depends on the axial and bending stiffness.This study provides ideas for the acoustic design of ships.
vibration and noise reductionbase impedancethree-way impedancebase seal plate
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