Active localization of wave propagation in elastic beams using periodic placement of piezoelectric actuator/sensor pairs

A novel strategy is proposed to investigate the active localization of elastic waves in beams with periodically placed piezoelectric actuator/sensor pairs under random feedback control gains. The randomly disordered active stiffness is obtained and periodically added to the beam. The localization factor is introduced and defined by using the eigenvalues of the transfer matrices. From this investigation, it is found that the active localization of elastic waves in beams can be realized and the propagation of elastic waves in certain designated frequency ranges can be actively controlled, Consequently, the feedback control gains can be intentionally designed to be random so that the frequency hand-gaps can be actively broadened and the ability for the structural vibration isolation and noise reduction can also be enhanced. Published by AIP Publishing.