Aiming at the problems of high natural frequency and low energy collection efficiency that piezoelectric energy harvesting device has

when collecting energy

a variable cross-section piezoelectric energy harvesting device is designed

and theoretical modeling and finite element analysis on piezoelectric vibrator are carried out.According to the analysis results

the natural frequency of the variable section cantilever beam is lower than that of the equal-section cantilever beam when the conditions are same. At the same time

when the thickness of the variable section cantilever beam is 0. 4 mm

the maximum output voltage can reach to 23. 77 V. Comparing with the equal-section cantilever beams

the variable section cantilever beam has the advantages of wide frequency band

high output voltage and light weight. Thus

when collecting the energy of the low-frequency vibration in the environment

a theoretical design basis is provided for the power supply device of the sensor.