PERFORATED THIN FILM SOUND ABSORBING CELL

摘要

The present invention relates to a perforated thin film sound absorbing cell which has excellent sound absorbing performance in a wide frequency range from low to high frequency ranges by forming a cutting line on an upper plate as a thin film and generating a higher order acoustic mode by higher mode vibration. The resonant sound absorbing cell comprises a lower plate; a side plate formed along the edge of the lower plate; and the perforated upper plate seated on the top of the side plate. The upper plate is a thin film which allows vibration and sound passing through the perforations to be transmitted through it back and forth. A cutting line is formed on the front and the rear sides and at the center of the upper plate in a lateral direction. A cutting line is formed on the left and right sides and at the center of the upper plate in a longitudinal direction.