Sensor setting method for supporting failure prediction

A sensor and sensor quantity technology, applied in the direction of instruments, analysis materials, etc.

Inactive Publication Date: 2009-06-17
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to avoid the deficiencies of the prior art, the present invention proposes a sensor setting method supporting fault prediction, which solves the problem of sensor setting method in fault prediction and life assessment of active bridges

Method used

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  • Sensor setting method for supporting failure prediction
  • Sensor setting method for supporting failure prediction
  • Sensor setting method for supporting failure prediction

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Embodiment Construction

[0034] The present invention will be further described now in conjunction with accompanying drawing:

[0035] Sensor Quantity Optimization Method

[0036] Suppose the measuring range of the instrument is A and the precision is η, then the absolute error limit is A×η. The formula for calculating the peak signal-to-noise ratio threshold P is: P = 10 log 10 ( a Sig 2 / a Noi 2 ) , In practical application, P can be obtained from instrument precision statistics.

[0037] Obtain the minimum acceleration peak value of the signal:|a min |≥A×η×10 0.05P

[0038] According to the modified Timoshenko beam theory, the lateral motion of the beam can be expressed as

[0039] κAG ...

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Abstract

The invention relates to a sensor setup method capable of supporting failure prediction. The method is technically characterized by comprising two steps: sensor number optimization and sensor location optimization: firstly, performing the sensor number optimization step: obtaining a minimum acceleration peak value of a signal according to parameters of an instrument, obtaining an incident wave propagation limit distance threshold according to a wave amplitude attenuation formula of incident wave and obtaining the minimum number n of the required sensors; and then obtaining the sensor arrangement location by a finite element model, and adjusting the number and the location of the sensors according to the incident wave propagation limit distance threshold. The method can help realize that parameter information which reflects real structure state is maximally obtained with the minimum sensor number. The method adapts to setup complexity of the sensors for structural health monitoring and damage detection, and can better meet the needs of the actual engineering application. The invention can provide a sensor setup standard for the structural damage detection and the structural health monitoring; and help configure a detection system or a monitoring system more economically and reasonably.

Description

technical field [0001] The invention relates to a sensor setting method supporting failure prediction, which belongs to the technical field of life prediction of major products and major facilities. Background technique [0002] For structural damage detection and health monitoring, sensors are used to obtain parameter information that reflects the real state of the structure, so as to achieve structural damage and health failure prediction. This is currently a method commonly used in the field of life prediction technology for major products and major facilities. Therefore, it is necessary to study a sensor setting standard to make the configured detection or monitoring system more economical and reasonable, adapt to the complexity of sensor settings in structural health monitoring and damage detection, and meet the needs of practical engineering applications. [0003] For more than 20 years, people have conducted extensive research on the optimal arrangement of sensors, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N35/00
Inventor 吴子燕杨海峰闫云聚
Owner NORTHWESTERN POLYTECHNICAL UNIV
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