Numerical investigation of the lift-off effect on the cut-off frequency in the Rayleigh wave

Author

Kang Zhang ; Pengxing Yi ; Yahui Li ; Xuming Zhang ; Zailin Guan

fYear

2014

fDate

3-5 Dec. 2014

Firstpage

411

Lastpage

415

Abstract

The EMAT is a non-contact transducer, but it is sensitive to the lift off. To study the lift off effect on the feature cut off frequency in the Rayleigh wave, a finite element method (FEM) is used. Based on different hypotheses of the source current density, three formulations are realized with the simulation software COMSOL. Ignoring the skin and proximity effects will yield enormous errors. The results obtained with the complete formulation are relatively accurate. A two dimensions (2D) EMAT transmitting model is built upon the complete formulation. On the basis of the 2D model, the lift off effect on the feature cut off frequency is investigated in detail.

Keywords

Rayleigh waves; acoustic transducers; current density; electromagnetic devices; finite element analysis; 2D EMAT transmitting model; COMSOL; FEM; Rayleigh wave; cut off frequency; electromagnetic acoustic transducer; finite element method; lift off effect; noncontact transducer; source current density; Acoustics; Coils; Cutoff frequency; Electromagnetics; Equations; Finite element analysis; Mathematical model; Formulation; Rayleigh wave; cut off frequency; lift off;

fLanguage

English

Publisher

ieee

Conference_Titel

Mechatronics - Mechatronika (ME), 2014 16th International Conference on

Conference_Location

Brno

Print_ISBN

978-80-214-4817-9

Type

conf

DOI

10.1109/MECHATRONIKA.2014.7018293

Filename

7018293