UNDERSTANDING THE MEASURED VIV DATA OF A STEEL CATENARY RISER INSTALLED AT P-18 PLATFORM IN CAMPOS BASIN

摘要

This article describes some analyses made using the raw measured data on monitoring bottles installed at P-18 SCR. The bottles used to perform the acquisition are briefly described, as the equipment used to measure the oceanographic data. A FEM program in time domain ANFLEX was used to analyze the signal to obtain the natural frequencies and mode shapes to be used in SHEAR7 program. The raw data was transformed in engineering data and these data in time domain were transformed to frequency domain. Some comparison is shown like the evaluation if the first band of frequencies is due to the waves and the second band of frequencies is due to VIV. Finally, it is shown how the damage can be obtained directly using the data measured from the SCR, giving some results.