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Method for calculating ultrasonic guided wave frequency dispersion relationship based on characteristic frequency method

A technology of characteristic frequency and ultrasonic guided wave, which is applied in calculation, special data processing applications, instruments, etc., can solve the problems that the dispersion equation cannot be theoretically obtained, and the dispersion relationship cannot be calculated, and achieve the effect of simple and practical calculation of the dispersion relationship

Active Publication Date: 2012-02-15
北京中盈盘古智能技术有限公司
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Problems solved by technology

[0002] The current method of calculating the dispersion relationship of ultrasonic guided waves is mainly to use the program to numerically calculate the dispersion equation to obtain the relationship between frequency and wave number, and further calculate the phase velocity dispersion relationship and group velocity dispersion relationship. This method is suitable for simple waveguide structures such as rods and tubes. , plate has good adaptability; but for the complex waveguide structure, due to the particularity of the boundary conditions, its dispersion equation cannot be theoretically obtained, so the dispersion relationship cannot be calculated

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  • Method for calculating ultrasonic guided wave frequency dispersion relationship based on characteristic frequency method
  • Method for calculating ultrasonic guided wave frequency dispersion relationship based on characteristic frequency method
  • Method for calculating ultrasonic guided wave frequency dispersion relationship based on characteristic frequency method

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Embodiment Construction

[0024] In conjunction with the content of the method of the present invention, an example of the calculation method of the guided wave dispersion relationship in the following plate is provided, and compared with the theoretical solution, the specific steps are as follows figure 1 Shown:

[0025] 1) Since the length and width of the plate structure are far greater than the thickness, when the guided wave propagates in the length direction, the influence of the width on it can be ignored, so it is simplified to a two-dimensional plane strain model, and the multiphysics field coupling software COMSOL Multiphysics 3.5a is selected The structural mechanics module in the analysis. Set the model length to 200mm, thickness to 4mm, Young's modulus E=207GPa, Poisson's ratio ν=0.296, density ρ=7800kg / m 3 ; The boundary conditions set the upper and lower bottom surfaces as free constraints, the left end surface as predetermined displacement constraints, and the right end surface as symm...

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Abstract

The invention discloses a method for calculating an ultrasonic guided wave frequency dispersion relationship based on a characteristic frequency method, belonging to the technical field of ultrasonic guided wave nondestructive test. Through selecting proper finite element analysis software and adopting a model having the same section parameter with the actually tested waveguide structure, the characteristic frequency of a waveguide structure is solved, and modals and wave numbers corresponding to different characteristic frequencies are counted. A phase velocity frequency dispersion relationship and a group velocity frequency dispersion relationship are calculated according to relevant formulas, and a wave structural drawing is drawn by using post-processed data. By using the method, the frequency dispersion relationship of any waveguide structure can be calculated, and particularly, the blank for calculating the frequency dispersion relationship of a complex section waveguide structure is made up. High programming capability and complex program debugging are not needed, and the calculated frequency dispersion relationship is simple and practical.

Description

technical field [0001] The present invention relates to a method for calculating the dispersion relationship of ultrasonic guided waves based on the eigenfrequency method, in particular, using finite element analysis software to calculate the eigenfrequency of waveguide structures (such as rods, tubes, plates, etc.), according to the calculated eigenfrequency and the obtained According to the corresponding mode shape and wave number, the corresponding relationship between each mode characteristic frequency and phase velocity and group velocity is calculated, so as to obtain the dispersion relationship of ultrasonic guided wave propagation in the waveguide structure. Background technique [0002] The current method of calculating the dispersion relationship of ultrasonic guided waves is mainly to use the program to numerically calculate the dispersion equation to obtain the relationship between frequency and wave number, and further calculate the phase velocity dispersion rela...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 吴斌刘飞何存富颜丙生
Owner 北京中盈盘古智能技术有限公司
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