A 2D Numerical Model of Ultrasonic Wave Propagation in Wooden Utility Poles Using Embedded Waveguide Excitation Technique

2020 ◽  
Vol 52 (1) ◽  
pp. 87-101
Author(s):  
Yishi Lee ◽  
Mohammad Mahoor ◽  
Wayne Hall
Keyword(s):  
Wave Propagation ◽  
Numerical Model ◽  
Ultrasonic Wave ◽  
Ultrasonic Wave Propagation ◽  
Utility Poles ◽  
2D Numerical Model

Simulations of ultrasonic wave propagation in concrete based on a two-dimensional numerical model validated analytically and experimentally

Ultrasonics ◽  
2019 ◽  
Vol 92 ◽  
pp. 21-34 ◽  
Author(s):  
Ting Yu ◽  
Jean-François Chaix ◽  
Lorenzo Audibert ◽  
Dimitri Komatitsch ◽  
Vincent Garnier ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Numerical Model ◽  
Ultrasonic Wave ◽  
Two Dimensional ◽  
Ultrasonic Wave Propagation

Simulation study of axial ultrasonic wave propagation in heterogeneous bovine cortical bone

2016 ◽  
Vol 140 (5) ◽  
pp. 3710-3717 ◽  
Author(s):  
Toshiho Hata ◽  
Yoshiki Nagatani ◽  
Koki Takano ◽  
Mami Matsukawa
Keyword(s):  
Wave Propagation ◽  
Cortical Bone ◽  
Ultrasonic Wave ◽  
Simulation Study ◽  
Ultrasonic Wave Propagation

scholarly journals OS0616 Numerical analysis of ultrasonic wave propagation in the corner section of CFRP structure

2013 ◽  
Vol 2013 (0) ◽  
pp. _OS0616-1_-_OS0616-3_
Author(s):  
Junta ITO ◽  
Takahiro HAYASHI ◽  
Akira KURAISHI ◽  
Shiro BIWA
Keyword(s):  
Wave Propagation ◽  
Numerical Analysis ◽  
Ultrasonic Wave ◽  
Ultrasonic Wave Propagation

scholarly journals High Frequency Ultrasonic Wave Propagation in  Anisotropic Materials

2021 ◽  
Author(s):  
◽  
Andrew Paul Dawson
Keyword(s):  
Wave Propagation ◽  
Ultrasonic Wave ◽  
High Frequency ◽  
Guided Wave ◽  
Ultrasonic Waves ◽  
Tissue Characterisation ◽  
Ultrasonic Wave Propagation ◽  
Matching Layer ◽  
Fibrous Tissues ◽  
Wave Modes

<p>The influence of highly regular, anisotropic, microstructured materials on high frequency ultrasonic wave propagation was investigated in this work. Microstructure, often only treated as a source of scattering, significantly influences high frequency ultrasonic waves, resulting in unexpected guided wave modes. Tissues, such as skin or muscle, are treated as homogeneous by current medical ultrasound systems, but actually consist of highly anisotropic micron-sized fibres. As these systems increase towards 100 MHz, these fibres will significantly influence propagating waves leading to guided wave modes. The effect of these modes on image quality must be considered. However, before studies can be undertaken on fibrous tissues, wave propagation in more ideal structures must be first understood. After the construction of a suitable high frequency ultrasound experimental system, finite element modelling and experimental characterisation of high frequency (20-200 MHz) ultrasonic waves in ideal, collinear, nanostructured alumina was carried out. These results revealed interesting waveguiding phenomena, and also identified the potential and significant advantages of using a microstructured material as an alternative acoustic matching layer in ultrasonic transducer design. Tailorable acoustic impedances were achieved from 4-17 MRayl, covering the impedance range of 7-12 MRayl most commonly required by transducer matching layers. Attenuation coefficients as low as 3.5 dBmm-1 were measured at 100 MHz, which is excellent when compared with 500 dBmm-1 that was measured for a state of the art loaded epoxy matching layer at the same frequency. Reception of ultrasound without the restriction of critical angles was also achieved, and no dispersion was observed in these structures (unlike current matching layers) until at least 200 MHz. In addition, to make a significant step forward towards high frequency tissue characterisation, novel microstructured poly(vinyl alcohol) tissue-mimicking phantoms were also developed. These phantoms possessed acoustic and microstructural properties representative of fibrous tissues, much more realistic than currently used homogeneous phantoms. The attenuation coefficient measured along the direction of PVA alignment in an example phantom was 8 dBmm-1 at 30 MHz, in excellent agreement with healthy human myocardium. This method will allow the fabrication of more realistic and repeatable phantoms for future high frequency tissue characterisation studies.</p>

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