ACTIVE CONTROL OF MEMBRANE-TYPE ACOUSTIC MATERIAL

摘要

Sound attenuation is performed using a sound attenuation panel using an electromagnetic or electrostatic response unit to modify resonance. The sound attenuation panel has an acoustically transparent planar, rigid frame divided into a plurality of individual cells configured for attenuating sound. In one configuration, each cell has a weight fixed to the membrane. The planar geometry of each said individual cell, the flexibility of the membrane, and the weight establish a base resonant frequency for sound attenuation. The electromagnetic or electrostatic response unit is configured to modify the resonant frequency of the cell.

主权项

1. A sound attenuation panel comprising:
a substantially acoustically transparent, rigid frame with a planar geometry divided into a plurality of individual cells configured for attenuating sound; a sheet of a flexible material fixed to the rigid frame; each individual cell having a weight fixed to a membrane; the planar geometry of each individual cell, a flexibility of the flexible material and the respective weight thereon establishing a base resonant frequency of the sound attenuation; and at least a plurality of the individual cells having a first electromagnetic or electrostatic response unit configured to modify a resonant frequency of the individual cell.