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Vol. 160, Issue 12, December 2013, pp. 93-98

 

Bullet

 

The Effect of the External Magnetic Field on the Initial Impulse Attribute for Magnetostrictive Sensors
 
1, 3 LONG Shengrong, 2 SONG Xiaochun, 2 ZHONG Yuning, 1 NIU Ying

1 School of Mechanical and Electrical Engineering, Nanchang University, Nanchang Jiangxi 330031, China

2 Hubei University of Technology, Wuhan Hubei 430068, China

3 Key Laboratory of Nondestructive Testing (Nanchang Hangkong University), Ministry of Education, Nan Chang Jiang Xi, 330063, China

1 Tel: +86 13767140846
E-mail: lornalong@126.com

 

Received: 9 October 2013   /Accepted: 22 November 2013   /Published: 30 December 2013

Digital Sensors and Sensor Sysstems

 

Abstract: Magnetostrictive sensors (MsSs) using the magnetostriction effect have many advantages for nondestructive inspections, such as without any contact, movable and easily installed. While the shortcoming of MsSs, for example low SNR and the output affected by the nonlinear magneto-mechanical coupling performance under magnetic field, can limit the use of it. In order to solve this problem, the mechanical dynamics model to excite guided-wave was established which was based on the nonlinear coupled magnetostrictive theory of ferromagnetic material and the generator model of magnetostrictive guided-wave. Using the finite element method (FEM) and numerical simulation, the effect of the bias magnetic field, exciting frequency and exciting current on the particle amplitude were analyzed. The results indicate that the low frequency, heavy current and suitable bias magnetic field can improve the conversion efficiency of magneto-mechanical coupling performance under the condition of considering dispersion. The suitable bias magnetic field is determined by the maximum tangent slope of the amplitude curve.

 

Keywords: Dynamical Model, FEM, Magnetostrictive, Ferromagnetic Material, Guided Wave.

 

 

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