Modeling and structural optimization of a Lorentz force-based omnidirectional electromagnetic acoustic transducer

In this paper we introduce an axisymmetric model of an omnidirectional electromagnetic acoustic transducer used to generate Lamb waves in conductive plates. The amplitudes of the displacement components are used for optimizations of the transducer. Three approaches to obtain the amplitudes are discussed. The first approach is solving the peak values of the envelopes of the time waveforms from the time domain simulations. The second approach also involves calculation of the peaks, but the waveforms are from frequency domain model combined with the forward and inverse Fourier transforms. The third approach involves a single frequency in the frequency domain model. The amplitudes are used in single objective and multi-objective optimizations to selectively generate A0 mode Lamb waves, implemented with the generic algorithms.