Damage Detection in a Plate Structure based on FBG sensing Technique under a Single-Mode Lamb Wave

International journal of online engineering

Zuo Xiaoqiong¹  Cai Li²  Hunag Xiao³ 

[1] School of Mechanical and Electronic Engineering, Wuhan Donghu University, Wuhan, 430070, China;School of Mechanical and Electronic Engineering, Wuhan Donghu University,Wuhan,430070, China;School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, 430070, China

关键词: Lamb Wave;    Damage Detection;    Fiber Bragg Grating(FBG);   

DOI  :  

学科分类：社会科学、人文和艺术（综合）

来源: International Association of Online Engineering

【 摘 要 】

Lamb wave is widely acknowledged as one of the most encouraging tools for damage identification in plate structures, and relevant research has been conducted intensively. However Lamb wave modes have different wave structure, frequency dispersion and attenuation characteristics, which are sensitivity to different types of damages and it is difficult to solve such engineering problems by conventional techniques. Although the single pattern detection method has been researched by piezoelectric wafers, there is little research about FBG sensing detection under single-mode ultrasonic Lamb wave technique currently. So this paper puts forward a single-mode Lamb wave technique for crack detection based on Fiber Bragg Grating sensor, which is used to receive the waves in the plate. First of all, measuring principle of single-mode ultrasonic Lamb technique and demodulation principle of the FBG sensor are introduced. And simulation analysis in the acoustic field is devoted, whose results lay the foundation for the damage detection in the plate. Then, the experimental system is built by a single-mode Lamb wave excitation, and the feasibility of fiber Bragg grating sensors in single-mode excitation method is verified by experiments.

【 授权许可】

Unknown