Harvesting vibration energy by novel piezoelectric structure with arc-shaped branches

•A novel energy harvester that consists of a piezoelectric inverted beam and two arc-shaped branches is proposed.•Simulation model of multi-physical coupled fields is built.•Under weak excitation the harvester can execute super-harmonic and sub-harmonic vibrations.•For the excitation of PSD = 0.07 g2/Hz, the output power can reach 21.2 μW.