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Ultrasonic guided waves based method for SHM : Simulations and an experimental test

Guided waves based methods are widely used for damage detection and localization in metallic and composite structures. Success of the method application depends on many factors like sensors/actuators location, sensor electronic system design, sensor shape, frequency range of excitation waves and applied signal processing procedures. Authors developed new modified LISA and EFIT algorithms to solve guided waves propagation problem in metallic and composite structures. Developed procedure helps to simulate wave propagation for damaged and undamaged structures for different configuration of sensors and actuators locations, shapes of sensors and frequency range. Simulation results helped to design system including hardware and software for monitoring and diagnostics of plate-like structures. Time and frequency domain methods are implemented in the system for damage detection. The simulation results have been validated using experimental test of aluminum and composite structures with different sensor/actuators configuration. New SHM system design based on formulated method and its application for real mechanical structures will be presented.