Dynamic Response Analysis of Tension Leg Platforms in Multi-directional Irregular Waves (Frequency Domain Analysis)

J. Ocean Eng. Technol. 1994;8(1):23-32.

다방향 불규칙파중의 TLP의 동적응답해석 (주파수영역 해석)

구자삼,조효제,이창호

부산수산대학교 선박공학과,부산수산대학교 선박공학과,부산수산대학교 공과대학 선박공학과

Keywords: Dynameic Responses, Tension Leg Platform, Multi-directional Irregular Wave, frequency Domain Analysis, Three Dimensional Source Distribution Method, Spectral Analysis Method

핵심용어: 동적응답, 인장 계류식 해양구조물, 다방향 불규칙파, 주파수영역 해석, 3차원 특이점 분포법, 스팩트럼 해석법

Abstract

A numerical procedure is described for simultaneously predicting the motion and structural responses of tension leg platforms (TLPs) in multi-directional irregular waves. The developed numerical approach is based on a combination of a three dimensional source distribution method, the finite element method for structurally treating the space frame elements and a spectral analysis technique of directional waves. The spectral description for the linear responses of a structure in the frequency domain is sufficient to completely define the responses. This is because both the wave inputs and the responses are stationary Gaussian ran dom process of which the statistical properties in the amplitude domain are well known. The hydrodynamic interactions among TLP members, such as columns and pontoons, are included in the motion and structural analysis. The effect of wave directionality has been pointed out on the first order motion, tether forces and structural responses of a TLP in multi-directional irregular waves.