SMC (Sequential Monte Carlo) algorithm based acoustic emission source location method

A sequential Monte Carlo, acoustic emission source technology, applied in the direction of using acoustic emission technology for material analysis, etc., can solve the problem of acoustic emission source positioning influence uncertainty, non-consideration and other issues

Active Publication Date: 2015-09-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The impact of these problems on the location of the acoustic emission source is uncertain
Traditional positioning algorit

Method used

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  • SMC (Sequential Monte Carlo) algorithm based acoustic emission source location method
  • SMC (Sequential Monte Carlo) algorithm based acoustic emission source location method
  • SMC (Sequential Monte Carlo) algorithm based acoustic emission source location method

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Embodiment Construction

[0028] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention but not to limit the scope of the present invention. It should be noted that these drawings are all simplified schematic diagrams, and only schematically illustrate the basic structure of the present invention, so they only show the configurations related to the present invention.

[0029] The acoustic emission source location method based on the sequential Monte Carlo algorithm described in the present invention is used for the location of the acoustic emission source under the influence of uncertainty factors, and the location method mainly considers the uncertainty caused by model error and measurement noise Impact; includes the following steps:

[0030] (1) For the acoustic emission source on the isotropic planar structure, arran...

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Abstract

The invention discloses an SMC (Sequential Monte Carlo) algorithm based location method. The method comprises the following steps: distributing not less than four sensors for receiving acoustic emission signals emitted by an acoustic emission source on acoustic emission sources of an isotropic planar structure; converting acoustic emission source location into bayesian filtering, building a system equation and a measurement equation respectively, using Poda moment between each sub-sensor and a main sensor as a known measurement quantity and taking a source position and the wave velocity as unknown state variables. The SMC simulation algorithm is adopted to perform iterative estimation on unknown status variables due to lack of analytical solution, and an acoustic emission source is located under the influence of uncertain factors.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing of engineering structures and provides an acoustic emission source location method based on a sequential Monte Carlo algorithm. Background technique [0002] Acoustic emission technology is a monitoring method to judge the internal damage of the structure according to the transient stress wave generated when the internal damage of the structure is initiated and expanded. The traditional acoustic emission technology evaluates damage by obtaining acoustic emission parameters from acoustic emission signals, and each acoustic emission parameter is a specific description of the acoustic emission process. With the development of guided wave theory, in recent years, acoustic emission technology has begun to change from parametric acoustic emission to modal acoustic emission. Modal acoustic emission is the study of the ultrasonic mode of the acoustic emission source in the material, and i...

Claims

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Application Information

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IPC IPC(8): G01N29/14
Inventor 严刚汤剑飞蔡晨宁金志光张林李永洲
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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