Development of a method for analyzing vibration in large-scale ship models using the fluid–structure interaction, part 1: Establishment of vibration analysis for ship by direct time integration and its verification with BOX model

Abstract

Analysis of ship vibration during design conventionally uses finite element analysis, which is highly accurate but is computationally burdensome for large-scale models. To address this, an explicit method of direct time integration that considers fluid–structure interaction with an outside fluid was developed. Numerical simulations using the proposed method were carried out with cubic and rectangular structure models. To assess the accuracy, the proposed method was verified by comparison between results from the proposed method and those from conventional vibration analysis. The observed results, including values for natural frequency, vibration mode, and velocity, were in good agreement with conventional results, showing sufficient accuracy. In addition, the proposed method required less memory for computation than conventional analysis did. Therefore, the proposed method represents a feasible method of analyzing vibration in large-scale models.