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Sensor arrangement method for reducing uncertainty of structural vibration mode matrix recognition

A technology of uncertainty and layout method, applied in the field of sensors, can solve the problems of inappropriate structural mode shape matrix identification, not involving the influence of mode shape quality, not considering measurement noise, etc., so as to reduce adverse effects and reduce Uncertainty, the effect of improving accuracy

Pending Publication Date: 2021-07-23
YANCHENG INST OF TECH
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Problems solved by technology

However, the theoretical framework of these sensor arrangement methods assumes that the mode shape matrix obtained from the sensor data is free from pollution, and does not involve the influence of error factors in the mode recognition process on the acquired mode shape quality
The existing sensor layout method does not consider the influence of error factors such as measurement noise on the mode shape identification, and is not suitable for the identification of structural mode shape matrices.

Method used

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  • Sensor arrangement method for reducing uncertainty of structural vibration mode matrix recognition
  • Sensor arrangement method for reducing uncertainty of structural vibration mode matrix recognition
  • Sensor arrangement method for reducing uncertainty of structural vibration mode matrix recognition

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Embodiment 1

[0053] The present invention adopts the posterior probability density function of structural mode matrix parameters to describe the uncertainty of vibration mode matrix identification; proposes an information entropy criterion to quantify the uncertainty of vibration mode matrix parameter identification; the numerical value based on information entropy criterion size, using sequential algorithms to guide sensor placement. Considering the identification of mode shape matrix parameters under the operating state of the structure, Gaussian noise is used for both environmental excitation and measurement noise. The sensor arrangement method proposed in the present invention is based on the Bayesian frequency domain modal recognition theory. By defining the selection matrix corresponding to the specific sensor position and constructing the posterior probability density function of the structure mode shape matrix parameters, the theoretical connection between sensor arrangement and st...

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Abstract

The invention relates to a sensor arrangement method for reducing structural vibration mode matrix recognition uncertainty, which is used for civil engineering structure health monitoring and is characterized by comprising the following steps: arranging a posterior probability density function of a vibration mode matrix and a sensor based on information entropy; the posterior probability density function of the vibration mode matrix is used for describing the uncertainty of vibration mode matrix recognition; according to the sensor arrangement based on the information entropy, the uncertainty of vibration mode matrix parameter recognition is quantified according to the information entropy criterion, and arrangement of the sensors is guided through the information entropy criterion by means of a sequence algorithm.

Description

technical field [0001] The invention belongs to the technical field of sensors, and in particular relates to a sensor arrangement method for reducing the uncertainty of structure mode shape matrix identification in civil engineering structure health monitoring. Background technique [0002] The structural mode shape matrix directly reflects the vibration deformation characteristics of the structure, and the mode shape matrix of each order reflects the deformation of the structure when it vibrates at the natural frequencies of each order. In structural health monitoring, the mode shape matrix identified from measurement data can be used for response reconstruction, damage identification, and safety assessment. Due to the existence of measurement noise, the mode shape obtained from the measurement data will deviate from the real mode shape of the structure. For the same structural working condition, different results will be obtained if the mode shape identification is perfor...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F17/16G06F17/14G06F111/08
CPCG06F30/23G06F17/16G06F17/141G06F2111/08
Inventor 裴雪扬石飞停尹明干杜玉兵
Owner YANCHENG INST OF TECH
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