Band gap frequencies of piezoelectric phononic crystals tuned by axial force

A theoretical model of piezoelectric phononic crystal with tuned band gaps has been proposed. The piezoelectric phononic crystal consists of a beam and periodic array of piezoelectric patches. Each pair of piezoelectric patches is connected in parallel by resonant shunting circuits independently. The effect of structure and material parameters on Bragg and locally resonant band gap has been investigated. The numerical results show Bragg band gap is tuned 34Hz by the axial force. Synchronization can be maintained spontaneously since it is not necessary to adjust parameter of every unit as the way that moving band gap by circuit parameter needs to change every shunting circuit synchronously. This property can enhance the applicability of phononic crystals.