Nonlinear Response Characteristics of the ISSC TLP in Time Domain

J. Ocean Eng. Technol. 2006;20(5):30-35.

Lee, Chang-Ho;

Department of Naval Architecture Tong-Myong University;

시간영역에서 ISSC TLP의 비선형 응답 특성

이창호;

동명대학교 조선공학과;

Keywords: Sum frequency, Difference frequency, Nonlinear wave exciting force, Natural frequency, Resonant response

핵심용어: 합주파수, 차주파수, 비선형 파강제력, 고유주파수, 공진 응답

Abstract

In tire presence of incident waves with different frequencies, there are second order sum and difference frequency wave exciting forces due to the nonlinearity of tire incident waves. Although the magnitude of these nonlinear wave forces are small, they act on TLPs at sum and difference frequencies away from those of the incident waves. So, the second order sum and difference frequency waveexciting forces occurring close to tire natural frequencies of TLPs often give greater contributions to high and law frequency resonant responses. Nonlinear motion responses and tension variations in the time domain are analyzed by solving the motion equations with nonlinear wave exciting forces using tire numerical analysismethod. The numerical results of time domain analysis for the nonlinear wave exciting forces on the ISSC TLP in regular waves are compared with the numerical and experimental ones of frequency domain analysis. The results of this comparison confirmed tire validity of the proposed approach.