라이저의 거동에 관한 실험적 연구

Abstract

In this study, a marine riser is subjected to top excitation with a period and amplitude in order to investigate the resultant (VIV) effects . The strain in the inline and cross- flow directions of a riser is measured using a (FBG) sensor, which detects the dynamic behavior of the riser by capturing the wavelength variation between the emission and absorption of a signal. (KC) numbers, even though a response peak is observed at the same frequency . For the same KC number with a different excitation frequency, the inline response is inversely proportional to the excitation frequency. On the other hand, the cross-flow response increases at high excitation frequencies. It is found that the component of the excitation frequency region in the cross-flow response is dominant at low KC numbers. As the KC number increases, the dominant component of the cross-flow response . The structural propagation wave induces the same response peak regions at all sensors along the riser length.