Time Domain Analysis of a Tension Leg Platform in Multi-Directional Irregular Waves

J. Ocean Eng. Technol. 2006;20(5):36-41.

Lee, Chang-Ho;Kim, Chuel-Hyun;

Department of Naval Architecture, Tongmyong University;Department of Naval Architecture and Marine Systems Engineering, Pukyong National University;

다방향 불규칙파중의 인장계류식 해양구조물의 시간영역 해석

이창호;김철현;

동명대학교 조선공학과;부경대학교 조선해양시스템공학과;

Keywords: Time domain analysis, Multi-directional irregular waves, Motion responses, Tension variations, TLP(Tension Leg Platform), Spectral analysis method

핵심용어: 시간영역해석, 다방향 불규칙파, 운동응답, 변동장력, 인장계류식 해양구조물, 스펙트럴 해석법

Abstract

The main object of this study is to develop an accurate and convenient method for the response analysis of offshore structures in real sea states. A numerical procedure is described for predicting the motion responses and tension variations of the ISSC TLP in multi-directional irregular waves. The developed numerical approach in the frequency domain is based on acombination of the three dimensional source distribution method, the dynamic response analysis method, and the spectral analysis method. Frequency domain analysis in the multi-directional irregular waves is expanded to a time domain analysis by using a convolution integral after obtaining the impulse response by Fourier transformation. The results of the comparison between responses in the frequency and time domain confirmed the validity of the proposed approach.