DYNAMIC SOUND ABSORBER

摘要

PURPOSE: A dynamic sound absorber is provided to considerably reduce noise by changing inside sound characteristics without a change in structure and to effectively generate a low sound. CONSTITUTION: A dynamic sound absorber includes an auxiliary sound cavity connected to an acoustic meter through a hole and a casing(6) having an inducing plate(4) and a cavity(5). The inducing plate and the cavity has a hole(3) having a neck part(2). The dynamic sound absorber adjusts a length of the neck, shape and size of the hole and shape and size of the cavity to have resonance frequency in frequency equal to inside space acoustic natural frequency for reducing a size of sound from the plurality of inside space acoustic natural frequencies.