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Shock load localization method for plate structure based on distributed fiber grating sensing network

A distributed optical fiber, grating sensing technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of poor generalization performance, easy to be affected by temperature changes, poor practicability and real-time performance, etc.

Active Publication Date: 2016-08-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, the shortcomings of this method require a large number of different impact situations to train the network, the generalization performance is not good, it is easily affected by temperature changes, and its practicability and real-time performance are not strong.

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  • Shock load localization method for plate structure based on distributed fiber grating sensing network
  • Shock load localization method for plate structure based on distributed fiber grating sensing network
  • Shock load localization method for plate structure based on distributed fiber grating sensing network

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Embodiment Construction

[0051] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used in the present invention and are not intended to limit the scope of the present invention, after reading the present invention, those skilled in the art can modify various equivalent forms of the present invention All fall within the scope defined by the appended claims of this application.

[0052] The flow chart of the plate structure impact load location method based on the distributed fiber grating sensor network is shown in Fig. Figure 4 As shown, the specific implementation steps are as follows:

[0053] Step 1: Distributed optical fiber sensor network layout

[0054] Such as figure 1 As shown, four fiber optic FBG sensors are symmetrically arranged in a square shape in the plate structure test piece, the fiber optic FBG sensors are pasted on the back of the plate structure test piece, and the four fiber optic FBG se...

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Abstract

The invention provides a plate structure impact load positioning method based on a distributed optical fiber grating sensor network, which belongs to the impact monitoring field of structural health monitoring. It includes the following steps: Step 1: Arrangement of distributed optical fiber sensor network; Step 2: Acquisition of shock response signal; Step 3: Feature information extraction and analysis of sensitivity characteristics of fiber optic FBG sensor; Step 4: Using the maximum peak amplitude of shock response signal The position of the impact point is located using the algorithm associated with the position information. The positioning algorithm of the invention is simple, fast, convenient and reliable, and has strong real-time performance.

Description

technical field [0001] The invention belongs to the field of impact monitoring of structural health monitoring, and specifically proposes a plate structure impact load positioning method based on a distributed optical fiber grating sensor network. Background technique [0002] The earliest shock location identification method is to calculate the location information of the shock by extracting the arrival time of the shock stress wave, and according to the relationship among distance, time, and stress wave velocity. However, in actual situations, the extraction of the time of arrival of the stress wave is greatly affected by noise. In 1997, Gaul and Hurlebaus used wavelet transform to process the shock response signal, which reduced the influence of noise and accurately extracted the time of arrival , for distance, multiple times. The wave velocity equation is optimized to obtain the location information of the shock. In 2005, Meo et al. applied this method to the impact lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/00
Inventor 曾捷张先辉曹亮史璐刘苏州毛超群
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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