Enhancement of unidirectional excitation of guided torsional T(0,1) mode by linear superposition of multiple rings of transducers

•The analytical method for designing waveforms in transducer arrays is proposed.•Increased power output for the unidirectional wave mode T(0,1) of guided waves.•Validated analytical predictions and numerical modelling of wave excitation along pipes.•In-depth investigation on performance of transducer arrays on the front-to-back ratio.