Operation bridge vibration and health state abnormity early warning method based on three-dimensional diagram

Abstract

The invention discloses an operation bridge vibration and health state abnormity early warning method based on a three-dimensional diagram. The method comprises the steps of testing and collecting an operation bridge acceleration response signal; carrying out pre-processing such as drift removal on the acceleration response signal; performing windowing function on acceleration response signals within a preset time length, calculating a power spectrum, and removing interference of excitation frequency; collecting the acceleration response signal power spectrums of a plurality of time periods into a three-dimensional diagram, and converting the three-dimensional diagram into a color plane graph or a gray plane graph; and judging bridge vibration abnormity and health state abnormityaccording to the change trend of each order of frequency and color or gray level change in the three-dimensional diagramso as to realize bridge early warning. According to the method, the vibration abnormity and the health state abnormity of the bridge can be effectively judged, so that early warning is given out, a structural analysis model is not needed, calculation is simple and convenient, environmental factor robustness is good, and good engineering applicability is achieved.

Description

technical field [0001] The invention belongs to the field of structural health monitoring, and relates to a structural vibration and state abnormal early warning technology, in particular to a method for early warning of vibration and abnormal health state of an operating bridge based on a time-frequency energy three-dimensional graph. Background technique [0002] There are more and more bridge structures in the world. Bridge structures are often large and complex. It will inevitably decline or even be damaged, and eventually lead to partial or even overall collapse of the structure. When an accident occurs, it will not only cause huge economic losses, but also endanger people's lives. Therefore, it is very important to monitor the vibration and condition of bridge structures. necessary. [0003] In recent decades, bridge structural health monitoring methods based on vibration parameters have also been proposed. Vibration parameters include frequency, mode shape, frequency...

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Problems solved by technology

However, due to the following problems, the application of these methods in actual engineering structures is hindered. First, when performing modal recognition, problems such as subjective errors, power spectrum leakage, dense mode loss, and truncation errors will inevitably occur; second. , in the time-domain health monitoring method based on vibration parameters, there are problems of system order determination and modal loss; third, it cannot contain as many modal information as possible, and the response signal related to damage is lost The high-order mode makes the extracted indicators not sensitive enough to structural state changes; fourth, some methods require manual participation in the calculation, resulting in the randomness of manual intervention, and are not suitable for automatic online analysis and health monitoring of massive continuous monitoring data; fifth, Due to too many uncertain factors in the actual bridge structure, it is difficult to establish an accurate matching structural analysis model, which makes it difficult to apply the health monitoring method relying on the structural analysis model to the actual bridge structure

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