A sensor optimization arrangement method based on structural response correlation of multiple load cases

Abstract

The invention relates to a sensor optimization arrangement method based on a structural response correlation of multi-load working conditions, and belongs to the technical field of civil engineering structural health monitoring sensor arrangement. The sensor optimization arrangement method includes the following steps that S1, the structural response under each load working condition is obtained,and a association relationship between the structural response under each load working condition is calculated; S2, a comprehensive association relationship of the structural response under the multi-load working conditions is determined; S3, a clustering method is adopted to determine an associated region of the structural response under the multi-load working conditions; and S4, obtaining complete structural response information is taken as a principle, arrangement points of sensors are determined based on the associated region of the structural response. Through the sensor optimization arrangement method, realization of global monitoring of a structure through the limited sensor measuring points is facilitated, and it is possible to obtain the complete structural response information under the multi-load working conditions and obtain better results, so that the effectiveness and feasibility of monitoring are ensured.

Description

technical field [0001] The application belongs to the technical field of sensor layout for civil engineering structure health monitoring, and in particular relates to a sensor optimization layout method based on multi-load condition structural response correlation. Background technique [0002] Structural health monitoring monitors the key parts of the structure and the surrounding environment. Based on the monitoring data, the real response of the real structure can be obtained. Real-time monitoring and diagnosis of major engineering structures can detect structural damage and evaluate its safety in time. However, the structural health monitoring system has limited measuring points, which are mainly based on the results obtained from the previous finite element model analysis. The arranged measuring points may not be in a good position, and at the same time, it is impossible to obtain the stress of all components and the joints. displacement, which is not sufficient for a c...

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Problems solved by technology

At present, for the optimal arrangement of sensors in key parts, some scholars determine the strain sensors in key parts of the structure based on the strain sensor arrangement method of multi-scale simulation and local stress analysis of the structure, and monitor the stress from the whole structure to the local part. The method only considers the key parts, and does not monitor the stress of other positions

In order to obtain the response where the sensor is not arranged, some scholars consider the interpolation and fitting error of the section to be the smallest based on the method of minimizing the interpolation fitting error, and fit the responses of other positions of the section according to the monitoring information of the section where the sensor is arranged. The cross-section selected by the method is uncertain, and the response of different spatial positions cannot be obtained

In addition, some scholars have proposed to optimize the arrangement of sensors based on the correlation between the responses, and to arrange the displacement sensors of the planar grid structure based on the response correlation analysis. Based on the displacement response of the arrangement point, the partial least squares method can be used to estimate the displacement response of other positions. , but this method does not consider the change of the relationship between the responses when the load changes, so it has certain limitations when the load changes

[0004] By analyzing the research of domestic and foreign scholars on the optimal arrangement of sensors, it is found that the current method is still insufficient for the optimal arrangement of sensors when the load condition changes, and it is impossible to monitor the structure globally through limited sensor measuring points.

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