Sound Insulation of Plenum Windows Installed with Rigid Cylinder Array

摘要

In this study, a 1:4 scale down model was established to investigate the acoustical performance of plenum window installed with a rigid cylinder array. A total of 6 rigid cylinders were vertically placed as a 2x3 array inside the central cavity of a plenum window. A linear loudspeaker array consisted of twenty-five 6 inch loudspeakers was used as the sound source. Results show that the placement of rigid cylinder array has an effect on the sound insulation of the plenum window. The traffic noise reduction of plenum window has been significantly enhanced by up to ～3 dB in some one-third octave bands. With the increase of frequency, noise reduction of the plenum window also increases. Installation of the 2x3 rigid cylinder array in the plenum window can enhance the sound insulation by ～1 dB.