Structural Damage Identification Method Based on Vibration Response Difference Ratio Function

Abstract

A structural damage recognition method based on a vibration response difference ratio function is disclosed. According to the method, after a vibration response measurement point of a to-be-tested structure is determined, a frequency response function matrix and a global transmissibility matrix of the to-be-tested structure are calculated based on measured data, the vibration response difference ratio function and a total transmissibility matrix are calculated and obtained by comparison with an undamaged structure, thereby achieving structural damage detection and positioning. The method onlyneeds a small amount of vibration measurement work, an implementation process is simple, and adaptability and operability of a vibration response analysis method in a complex structure health detection problem are greatly improved.

Description

technical field [0001] The invention relates to a technology in the field of mechanical flaw detection, in particular to a structural damage identification method based on a vibration response difference ratio function. Background technique [0002] Large-scale mechanical structures and building structures are inevitably affected by factors such as chemical corrosion, external loads, and material degradation during service, resulting in structural damage and affecting their structural strength. Existing structural damage identification methods mainly include ultrasonic methods, eddy current method, X-ray method, and vibration response method, among which the vibration response method is widely used because of its low cost and easy realization of online continuous monitoring. Vibration response structural damage methods are mainly divided into two categories: identification methods based on test data and identification methods based on models. The disadvantage of the model-b...

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Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies existing in the prior art, the present invention proposes a structural damage identification method based on the vibration response difference ratio function. According to the vibration response difference ratio, the change of the vibration response relationship caused by structural damage can be effectively extracted and quantified to realize The precise detection and location of structural damage requires only a small amount of vibration measurement work, and the implementation process is simple, which greatly improves the applicability and operability of the vibration response analysis method in complex structural health detection problems

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