Numerical Modelling and Experimental Verification of Interdigital Transducers for Lamb Wave Generation
Recently, intensive research activity in the application of guided waves (GWs) for structural health monitoring (SHM) has been observed. Interdigital Transducer (IDT) is one of the types of transducers used for generating GWs. The main advantages of such transducers include their ability in generating directional and mode-selective waves. The parameters of IDTs have to be adjusted for the excited wavelength. Some geometric parameters as well as the properties of materials used for manufacturing transducers may be defined using widely known analytical relationships . However, in order to accurately determine the parameters of the IDT, numerous simulations and their experimental verification are required . The paper presents a novel, time efficient approach to the virtual prototyping of complex shaped transducers. The proposed procedure consists of the following four steps: (1) designing a transducer based on analytical relations, (2) approximate numerical simulations of designed transducers with a custom-made, computationally efficient code for screening tests, (3) detailed numerical tests employing the multiphysics Finite Element Method (FEM) for the developed IDT design and (4) experimental tests.
Algirdas V. Valiulis, Olegas Černašėjus and Vadim Mokšin
M. Mańka et al., "Numerical Modelling and Experimental Verification of Interdigital Transducers for Lamb Wave Generation", Solid State Phenomena, Vols. 220-221, pp. 843-848, 2015