A new acoustic barrier structure with resonant sound of micro-perforation board absorption structure and impedance composite sound-absorption structure is proposed.The acoustic impedance and the sound-absorption coefficient of the acoustic structure are calculated via means of equivalent circuit.MATLAB is used to calculate the relationship between the parameters of the ontology structure and the sound-absorption coefficient and the sound insulation.It is revealed that the sound barrier of the new ontology structure is 7.659.80 dB,which is more than the sound barrier of the traditional reflective structures.The relationships among the parameters of sound-absorption structure,sound-absorption coefficient,and sound insulation performance are obtained.In addition,the parameters can be transformed to satisfy the noise reduction requirements of various road sections,which has a admirable adaptability.The acoustic barrier can have tremendous acoustic performance only if there is a splendid sound insulation in the traffic noise frequency band.
The sound characteristic of the piezoelectric ceramics is posed for the excellent mechanic and electric coupling performance of piezoelectric material.Two pieces of piezoelectric ceramic are used as materials of active absorption and active isolation,two pieces of PVDF with equal distance are placed in the front of the material in order to measure the incidence plane wave and the reflected wave,the voltages are applied on the surface of the material in order to make the reflected wave and transmission wave be zero using the adaptive controlling.At last,emulation is carried out with plane wave,and good absorption and isolation effect is achieved.
