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Elastic wave mode separation method and elastic wave mode separation system

A technology of mode separation and mode separator, applied in the direction of fluid using vibration

Active Publication Date: 2017-04-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no effective physical mechanism that can spatially and losslessly separate these two propagation modes

Method used

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  • Elastic wave mode separation method and elastic wave mode separation system
  • Elastic wave mode separation method and elastic wave mode separation system
  • Elastic wave mode separation method and elastic wave mode separation system

Examples

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Embodiment 1

[0072] As an embodiment of the present invention, the New Hooke material 1 is selected to be approximately incompressible, and the material produces uniform and simple shear deformation under the action of body displacement load. For this reason, in the case of plane strain, the new Hooke material PSM-4 with a square section of 12cm×12cm (material parameter λ = 2GP, aμ = 1.08MPa and the initial state bulk density ρ = 1050Kg / m 3 ) Applied body displacement load U y =-(x-0.6) / 30m (unit: m, that is, apply the corresponding displacement load U at all points of the corresponding coordinate x of the new Hook material 1 y ) To produce uniform and simple shear deformation of the material, the corresponding deformation gradient tensor is as (2), and tanγ=1 / 3. Such as Figure 7 As shown in a, the body coordinate line of the material is evenly distributed. At the same time, calculate the von-Mises stress of the material to be 6.35×10 5 N / m 2 , Which shows that the material presents a unifo...

Embodiment 2

[0074] As another embodiment of the present invention, the New Hooke material 1 is selected to be compressible, and the material produces uniform and simple shear deformation under the action of body displacement load. For this reason, the material parameters of New Hooke material 1 are selected as λ=4.32MPa, μ=1.08MPa and ρ=1050Kg / m 3 . The position where the elastic wave excitation is applied and the corresponding displacement amplitude are the same as those in the first embodiment, but the angular frequencies of the P wave and the S wave in this example are both set to ω=0.3MHz. The demultiplexing effect of the device is similar to the previous embodiment, such as Figure 7 Shown in d. Similarly, the N at the vertical line segment 33 in this example P And N S The spatial distribution of Figure 7 As shown in e. The difference from the previous example is that in addition to the change in the propagation path of the S wave, the propagation path of the P wave has also undergo...

Embodiment 3

[0080] As another embodiment of the present invention, the New Hooke material 1 is selected to be approximately incompressible, and at the same time, the material is similar to that under the action of boundary displacement load. figure 2 The approximate simple shear deformation of b. For this reason, in the case of plane strain, the first surface 31 of the new Hooke material PSM-4 (the material parameters are the same as above) with a square section of 12cm×12cm is fixed, and a displacement load U is applied to the second surface 32 y =4cm, which makes the New Hooke material 1 produce approximately simple shear deformation, the deformation gradient tensor is approximately as (2), and tanγ=1 / 3. The other experimental parameters and characterization methods of this embodiment are the same as those of embodiment 1. The experimental results are as Picture 9 Shown in a-c. It can be seen that the approximate simple shear deformation causes the P wave and S wave propagating in the ...

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Abstract

The invention relates to a method for elastic wave mode separation. An elastic wave comprises two modes including a shear wave and a compression wave. The method comprises the following steps: a new hookean material in a natural state is provided; the new hookean material is provided with a first surface and a second surface; the second surface is opposite to the first surface and parallel to the first surface; the new hookean material is enabled to be deformed; the deformation means that relative displacement is generated between the first surface and the second surface in the direction parallel to the first surface, so that simple shear deformation or approximately simple shear deformation is formed; the elastic wave enters from the first surface and exits from the second surface; the shear wave and the compression wave, which are separated, can be received at different positions of the second surface. The method is simple, and can realize the nondestructive separation of the shear wave and the compression wave. The invention further relates to a system, adopting the method, for elastic wave mode separation.

Description

Technical field [0001] The present invention relates to the technical field of elastic wave processing, in particular, to an elastic wave mode separation method and an elastic wave mode separation system. Background technique [0002] As a transmission process of energy and information in elastic media, elastic waves are widely used in many fields such as earthquake monitoring, non-destructive testing, telecommunications, metallurgy, and biomedical imaging. Generally speaking, elastic waves propagating in elastic media have two propagation modes, which are called shear waves (abbreviated as S waves) and compression waves (abbreviated as P waves). These two propagation modes usually have different functions in specific engineering applications. For example, in shear wave ultrasonic elastography technology, S wave is used as an external excitation, and P wave is used as a detection method to measure the local deformation caused by S wave. In addition, in seismic surveys, the P-wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B06B3/00
Inventor 冯西桥常正郭昊原李博
Owner TSINGHUA UNIV
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