Oceanographic engineering structure tiny damage judgment method

Abstract

The invention discloses an oceanographic engineering structure tiny damage judgment method which comprises the following steps: (1), performing vibration test on an intact oceanographic engineering structure in an actual operation environment to obtain an intact frequency matrix of the structure; (2), performing a vibration test on the ocean engineering structure containing the damage in the actual operation environment to obtain a to-be-tested frequency matrix of the structure; (3), performing linear discriminant analysis on the frequency matrix, and solving the projection direction with theoptimal intact and to-be-tested frequency classification performance to obtain the frequency residual error of the intact and to-be-tested structure; and (4), performing structural damage judgment onintact and to-be-detected frequency residual errors through a hypothesis testing technology. According to the scheme, the linear discriminant analysis method is used for processing the original frequency matrix, the influence of environmental factor changes on structural vibration characteristics is effectively eliminated, the frequency residual capable of reflecting structural health informationis obtained, the effective statistical hypothesis testing technology is used in cooperation, and the tiny damage state of the structure is accurately judged. And the method has certain guiding significance for early warning of the structure and maintenance and reinforcement decisions.

Description

technical field [0001] The invention relates to the field of ships and marine engineering, in particular to a method for judging micro-damage of marine engineering structures under conditions of environmental factors and noise interference. Background technique [0002] Offshore platforms, offshore wind turbines and other offshore engineering structures are the basic facilities for the development of offshore oil, gas and wind energy resources, and they are exposed to harsh marine environments for a long time, so they are prone to fatigue accumulation damage, resulting in structural failure and huge economic losses. Therefore, it is very important to carry out damage detection for marine engineering structures. [0003] At this stage, the commonly used methods for damage detection of marine engineering structures can be summarized as local detection and overall detection. Among them, local detection methods started earlier and developed relatively maturely; such as magnetic ...

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Problems solved by technology

It is worth noting that most of these methods do not consider the impact of changes in marine environmental factors on damage detection performance.

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