Random Vibration Excitation Study of a Model Offshore Structure: A Damage Detection Approach

摘要

A laboratory reduced scale model of an offshore jacket structure is described. The structure was excited with a miniature vibration exciter with random excitation source input. Multiple accelerometers were mounted along the main columns of the test structure, and acceleration response signal acquired through a multichannel data acquisition system. The natural eigenfrequency and eigenvector were determined from the ARMAV (Vector Auto Regressive Moving Average) moel, and the modes identified from the response signal using the subspace state space system estimation method.