L-shaped piezoelectric energy harvester for low frequency application

In this paper, the L-shaped piezoelectric (PZ) cantilever structure has been designed, which is suitable for low frequency application. The size of the designed structure is within 5 mm. This makes it suitable to power any wireless sensor nodes for machine monitoring system. The L-shaped cantilever structure helps in reducing resonant frequency. It is able to achieve resonant frequency of 79.5 Hz. The proposed structure is simulated at 1g excitation acceleration and generates the output voltage of 11.6 V at its natural frequency. The proposed L-shaped PZEH generates an output power of 10.8 μW at its resonant frequency.