This work proposes a numerical approach based on a Semi-Analytical Finite Element (SAFE) model to predict temperature effects on guided waves generated and received by low-profile piezoceramic (PZT) transducers. The proposed model includes the cumulative role of transducer elements (actuator and sensor), substrate structure, and transducer/structure interaction, in the prediction of the full pitch-catch guided wave response under changing temperature. Experimental tests were carried out in a controlled environmental chamber at different temperatures ranging from -40 C up to 60 C. Time and frequency domain based system responses were obtained. Numerical versus experimental results show that the proposed model is capable of capturing the effect of temperature on PZTs generated/received Lamb waves with great accuracy. In addition, because the SAFE is capable to model also wave propagation in anisotropic plates, the proposed model can lay the groundwork for the development of more robust Structural Health Monitoring (SHM) strategies for complex aerospace structures.
Numerical prediction and experimental verification of temperature effect on plate waves generated and received by piezoceramic sensors
MARZANI, ALESSANDRO;
2012
Abstract
This work proposes a numerical approach based on a Semi-Analytical Finite Element (SAFE) model to predict temperature effects on guided waves generated and received by low-profile piezoceramic (PZT) transducers. The proposed model includes the cumulative role of transducer elements (actuator and sensor), substrate structure, and transducer/structure interaction, in the prediction of the full pitch-catch guided wave response under changing temperature. Experimental tests were carried out in a controlled environmental chamber at different temperatures ranging from -40 C up to 60 C. Time and frequency domain based system responses were obtained. Numerical versus experimental results show that the proposed model is capable of capturing the effect of temperature on PZTs generated/received Lamb waves with great accuracy. In addition, because the SAFE is capable to model also wave propagation in anisotropic plates, the proposed model can lay the groundwork for the development of more robust Structural Health Monitoring (SHM) strategies for complex aerospace structures.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
