In summary, an acoustic energy harvesting generator based on the sonic crystal and the piezoelectric material are realized and modeled The larger voltage output of the piezoelectric material is associated with the larger pressure in the cavity of the sonic crystal. When the frequency of the incident acoustic wave is at 4,2 kHz, a maximum power is generated under a load resistance 3,9 kΩ. The output power is dependent on the input level of the source. If the source is a turbofan engine, we think that the large output power will be produced. To improve the output power, the higher piezoelectric constant of piezoelectric materials should be selected. In addition, the piezoelectric beam can be designed to have the resonant frequency, which is the same as the resonant cavity and incident wave. The larger output should be reached. By using properties of band gaps and
wave localizations of the sonic crystal, the noise control and energy harvesting can be achieved simultaneously