Sensor arrangement method for reducing structural inherent frequency recognition uncertainty

A technology of natural frequency and uncertainty, applied in the field of sensors, can solve the problems of not considering the influence of frequency parameter identification, unsuitable structural natural frequency identification, etc., to reduce adverse effects, reduce uncertainty, and improve accuracy Effect

Inactive Publication Date: 2021-07-23
YANCHENG INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the theoretical framework of these sensor arrangement methods does not consider the influence of error factors such as measurement noise on the identification of frequency parameters, and is not suitable for the identification of structural natural frequencies

Method used

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  • Sensor arrangement method for reducing structural inherent frequency recognition uncertainty
  • Sensor arrangement method for reducing structural inherent frequency recognition uncertainty
  • Sensor arrangement method for reducing structural inherent frequency recognition uncertainty

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Embodiment 1

[0050] The present invention uses the posterior probability density function of structural frequency parameters to describe the uncertainty of natural frequency identification; proposes an information entropy criterion to quantify the uncertainty of natural frequency parameter identification; based on the numerical value of the information entropy criterion, the utilization order Algorithms to guide the placement of sensors. Considering the identification of frequency 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 structural frequency parameter, the theoretical connection between the sensor arrangement and the identif...

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Abstract

The invention relates to a sensor arrangement method for reducing structural inherent frequency 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 inherent frequency and a sensor based on information entropy; the posterior probability density function of the inherent frequency is used for describing the uncertainty of inherent frequency recognition; according to the sensor arrangement based on the information entropy, an information entropy criterion is put forward to quantify uncertainty of inherent frequency parameter recognition, and arrangement of the sensors is guided through the information entropy criterion by using a sequential 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 structural natural frequency identification in civil engineering structure health monitoring. Background technique [0002] The natural frequency of the structure directly reflects the dynamic characteristics of the structure. When evaluating the performance of the structure, it is necessary to analyze whether the structure is damaged according to the change of the natural frequency of the structure. When using the measurement data to identify the natural frequency of the structure, due to the existence of measurement noise, the frequency parameters obtained from the measurement data will deviate from the real frequency parameters of the structure. Through different segmental sampling data, multiple natural frequency identifications will get different results. The difference between different frequency ident...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F17/14G06F17/16G06F111/08
CPCG06F30/23G06F17/141G06F17/16G06F2111/08
Inventor 裴雪扬尹明干石飞停杜玉兵
Owner YANCHENG INST OF TECH
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