불규칙파 중 파랑 및 운동응답의 수렴성에 관한 실험 연구

Abstract

This study investigates the convergence characteristics of variance in wave and motion responses under irregular wave conditions using experimental model tests. Two wave conditions with identical significant wave height (Hs) and peak period (Tp) but different peak enhancement factors (γ = 1.0 and γ = 3.3) were considered. Experiments were conducted under zero-speed conditions using a 1/82 scale model of the KLNG2. Spectral analysis, response amplitude operators (RAOs), and autocorrelation functions were used to estimate the required measurement time for statistical convergence. The results confirm that the method proposed by Naito and Kihara (1993) is applicable to both wave and motion response convergence assessment. It was found that a higher peak enhancement factor leads to slower decay in autocorrelation function and requires longer measurement time for convergence. Furthermore, wave elevation and motion responses showed distinct convergence behavior due to differences in spectral shape and frequency characteristics. The findings suggest that estimating response spectra in advance allows prediction of required measurement duration based on acceptable error levels. This approach can improve the accuracy and reliability of model experiments in irregular waves.