Lamb wave damage location method based on non-linear unscented Kalman filtering algorithm

A Kalman filtering and damage localization technology, which is applied in the analysis of solids, instruments, and materials using sonic/ultrasonic/infrasonic waves, and can solve problems such as active monitoring of plate structures and identification of influences

Inactive Publication Date: 2016-11-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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These issues all affect the active monitoring a

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  • Lamb wave damage location method based on non-linear unscented Kalman filtering algorithm
  • Lamb wave damage location method based on non-linear unscented Kalman filtering algorithm
  • Lamb wave damage location method based on non-linear unscented Kalman filtering algorithm

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[0041] 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.

[0042] A Lamb wave damage location method based on a nonlinear odorless Kalman filter algorithm according to the present invention is used for damage location in an isotropic planar structure and the solution of Lamb wave velocity; comprising the following steps:

[0043] (1) Arrange multiple (not less than 4) piezoelectric sensors on isotropic planar structures containing damage; the piezoelectric sensors described can be used to excite and receive ultra...

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Abstract

The invention discloses a lamb wave damage location method based on a non-linear unscented Kalman filtering algorithm. The method includes the steps that multiple (at least four) piezoelectric sensors for exciting and receiving ultrasonic lamb waves are arranged on a damage-containing isotropous planar structure; the damage position is recognized and converted into a Bayes filtering problem, a state vector evolution systematic equation and a non-linear measurement equation are set up, the propagation time of the lamb waves scattered by damage on routes of all exciting sensors and all receiving sensors is used as known measurement quantity, and the damage center position and the lamb wave speed are used as unknown state variables. The non-linear unscented Kalman filtering algorithm is adopted for iterative estimation, and therefore damage location and solution of lamb wave speed are achieved.

Description

Technical field: [0001] The invention provides a Lamb wave damage location method based on a nonlinear tasteless Kalman filter algorithm, which belongs to the technical field of engineering structure nondestructive testing. Background technique: [0002] Ultrasonic Lamb wave technology is an active monitoring method to judge the internal damage of the structure by exciting and receiving transient stress waves in the plate structure. Lamb waves can travel long distances in structures, making them ideal for monitoring thin-walled structures like wings and fuselages. Lamb wave technology can detect different types of damage such as cracks and delaminations on the surface and inside of the structure, and can improve the ability to identify small damage by increasing the frequency of the diagnostic wave signal (that is, reducing the wavelength). Therefore, in recent years, academia and industry have conducted extensive research on the application of Lamb wave technology for acti...

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Application Information

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IPC IPC(8): G01N29/07
CPCG01N29/07G01N2291/011G01N2291/023G01N2291/0427
Inventor 严刚汤剑飞蔡晨宁
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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