Abstract
The influence of temperature on SHM (Structural Health Monitoring) systems using guided waves is a major problem for their industrial deployment. One of the cheapest SHM process developed in aeronautical context is based on piezoelectric transducers mounted on the monitored structure. Several methods are used to assess the presence of damage. A popular one is based on tracking changes in the electromechanical impedance of the transducers: it is an efficient damage indicator around the device and can also be used as a fault diagnosis indicator for the transducer itself. However, monitoring decisions need to be robustified with temperature sensors also mounted on the structure. In this article, the electromechanical impedance is used to determine the temperature on each lead zirconate titanate transducer (PZT). This avoids supplementary instrumentation and the entire temperature field of the structure is estimated. The proposed approach is tested experimentally on a on a small composite plate and then on a real part of an A3 80 composite nacelle. Results show that the temperature field on the structure can be estimated with a precision of ±5 °C using a linear regression between static capacity and temperature.
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