常時微動計測に基づくジャケット式海洋プラットフォームのモード同定

概要

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Modal identification of a jacket-type offshore platform iscarried out by employing an ARMA method which is only based on output data and uses cross spectrtum of two outputs. Dynamic response of the platform under waves is analyzed in time domain with retaining the nonlinear hydrodynamic damping due to fluid drag forces. The simulated response data is regarded as the ambient vibration measurements to which Gaussian white noise of 10% RMS of the measured data is added as the noise. Simulation results demonstrate that the ARMA method can identify the natural frequencies and mode shapes precisely. It is also shown that the method is stable in identifying the offshore platform under different wave states and is robust against noise disturbance. Therefore, it can be expected that the ARMA method can be well applied to the health monitoring of offshore platforms.
一般社団法人日本建築学会の論文
2004-03-20