Open Access Open Access  Restricted Access Subscription or Fee Access

Model-based Ultrasonic Guided Wave Inspection to Identify and Attenuate the Effect of Environmental Temperature in Structural Health Monitoring



Ultrasonic guided wave investigation is considered an accurate approach to directly measure the structural variations and achieve the desired monitoring results in a single inspection test. Still there exist some issues in real time morphological investigations, such as sensitivity of propagating waves and piezoelectric sensors to the fluctuation in environmental and operating conditions (EOCs). Structural health monitoring (SHM) setup’s feedback mechanism and reliability of inspection process are affected by the EOCs effect. The ultimate aim of current research is to propose a model- based ultrasonic guided wave inspection scheme to identify and attenuate the effect of environmental temperature on the guided wave signal and PZT sensors. A specific arrangement of sensors and actuators network is designed to achieve optimal results from proposed scheme. A time domain numerical analysis is conducted in ABAQUSTM, and MATLAB® environment is utilized to develop a wave velocity function on the basis of FEM results to measure the group velocity of S0 wave mode. To retain excitation frequencies in certain limit and remove the noise, a low band pass filter is used in current research. Finally, an analytical solution is applied to calibrate the FEM results and validate the proposed scheme. A good agreement is observed between analytical solution and FEM results.


Full Text: