Local response estimation of a seagoing vessel using onboard measurement data

Abstract

Structural integrity management is gaining popularity because of the wide-spreading application of the digital twin concept, which is based on the fusion of the real-world measurement data and digital model used for the design. Data fusion between the measurement data and design model makes structural integrity management a feasible solution with a limited number of sensors, provided a reliable and robust local response estimation algorithm can be provided. This paper presents a methodology through which a local stress response at an arbitrary location within a seagoing vessel can be estimated using onboard measurement data. For the response transfer from the measured location A to the unmeasured location B, the relative RAO, which defines the ratio of response amplitude between location A to B, was introduced. The relative RAO concept was applied by decomposing the response spectrum at measured location A into its comprising directional components using the least square method with non-parametric modeling. The proposed method was validated using the numerically generated pseudo measurement data, where some noises were introduced artificially to imitate the actual measurement. Finally, the full-scale measurement data of the 13,000TEU container carrier was analyzed and used to verify the proposed method.