In order to harvest the acoustic energy in the environment efficiently

an acoustic energy harvesting system is proposed with piezoelectric transducer array

straight tube resonator and energy harvesting circuit.When the acoustic wave transmits into the straight tube resonator

the resonance standing wave is generated in the tube

and excites the piezoelectric transducers;then the acoustic energy is converted into electrical energy.An energy harvesting circuit is designed and analyzed theoretically with simulation.The relationship between the number of piezoelectric chips

the frequency of acoustic waves

the acoustic pressure level and the output voltage is studied with experiments.The output voltage and power are analyzed with the change of load resistance.Experimental results show that the proposed system can harvest the acoustic energy in different frequencies

and the harvested power achieve the maximum at the sound frequency of 96Hz.Without using the energy harvesting circuit

the maximum output AC voltage effective value is 12.9V and the maximum output AC power is 799μW at the incident acoustic pressure level of 110dB.When the proposed energy harvesting circuit is applied

the maximum output DC voltage is 64.2V and the maximum output DC power is 473μW.The acoustic energy harvesting system can not only harvest acoustic energy

but also can power the micro electronic systems such as wireless sensor nodes.