HELMHOLTZ RESONATOR, AND LOW-FREQUENCY BROADBAND SOUND-ABSORBING AND NOISE-REDUCING STRUCTURE BASED ON SAME

摘要

A Helmholtz resonator and a low-frequency broadband sound-absorbing and noise-reducing structure based on the same. The Helmholtz resonator comprises a main body (1). One or more embedded tubes (2, 4) are provided within the main body (1). An inner side surface of an opening of the main body (1) surrounds the outer side of one of the embedded tubes (2, 4). The embedded tubes (2, 4) are not in mutual contact. The low-frequency broadband sound-absorbing and noise-reducing structure comprises a rigid frame and at least two Helmholtz resonators arranged in parallel within the frame. The invention uses the Helmholtz resonator to achieve a superior low-frequency broadband sound-absorbing and noise-reducing effect, and effectively reduces the thickness of the Helmholtz resonator. In addition, the low-frequency broadband sound-absorbing and noise-reducing structure enhances the sound-absorbing effect of each weak sound-absorbing Helmholtz resonator therein, thereby improving sound-absorbing efficiency over a wide frequency range by using a thin low-frequency broadband sound-absorbing structure.