Method for identifying modal parameters of ocean platform structure
A technology of offshore platform and structural modal, applied in the field of offshore oil engineering
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[0069] Such as Figure 1 to Figure 2-4 Shown, the present invention adopts following steps:
[0070] Step 1: Perform directional processing on the input stimulus response data of the offshore platform structure environment;
[0071] In order to extract the environmental excitation response data of the offshore platform structure in the standard direction, it is necessary to project the data measured by the vibration measurement node in the standard direction, that is, to perform directional processing;
[0072] Step 2: Construct the Hankel matrix using the stimulus response data of the structural environment, and perform orthogonal triangular (QR) decomposition on it to obtain the projection matrix, then perform singular value (SVD) decomposition on the projection matrix, and then The state space of the system is solved by using the least square method, that is, its state space representation is a mathematical model that expresses the physical system as a set of input, output...
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