A sensor setting method for local deformation and overall modal information for structure

Abstract

The invention belongs to the field of health monitoring of civil engineering structures, and proposes a sensor layout method for simultaneous acquisition of local deformation of structures and overall modal information. (1) Arrange the strain gauge at the large deformation position of the structure to monitor the local deformation information of the structure, and adjust the position of the strain gauge so that it contains as much important displacement mode information as possible; (2) Use the strain modal information of the strain gauge position The displacement modes of the structure are estimated based on state estimation, and accelerometers are added to improve the distinguishability of the estimated displacement modes, and at the same time reduce the information redundancy between the obtained displacement modes. The present invention makes full use of the different structural information contained in the strain gauge and the accelerometer. The layout scheme of the strain gauge can not only provide the local deformation information of the key position of the structure, but also obtain the accurate structural displacement modal information. The layout scheme of the accelerometer Improve the displacement modal information obtained from strain gage data estimation, and obtain high-quality structural overall displacement modal information.

Description

technical field [0001] The invention belongs to the field of health monitoring of civil engineering structures, and proposes a joint layout method of strain gauges and accelerometers for the acquisition of local deformation of structures and overall modal information. Background technique [0002] The establishment of a structural health monitoring system first requires sensor selection and optimal layout. Improper sensor layout will affect the accuracy of parameter identification; and the sensor itself also requires a certain cost, and the cost of the data acquisition and processing equipment used with it is also high. Both are relatively high. From an economical point of view, engineers hope to use as few sensors as possible to achieve the purpose of monitoring. A good sensor layout scheme should meet the following requirements: 1) In a noisy environment, it can use as few sensors as possible to obtain comprehensive and accurate structural parameter information; 2) The mea...

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Problems solved by technology

[0002] The establishment of a structural health monitoring system first requires sensor selection and optimal layout. Improper sensor layout will affect the accuracy of parameter identification; and the sensor itself also requires a certain cost, and the cost of the data acquisition and processing equipment used with it is also high. are high, from an economical point of view, engineers hope to use as few sensors as possible to achieve the purpose of monitoring

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