| 摘要 |
An acoustically absorptive panel comprises a forward airspace bounded by an acoustically transparent front fabric stretch-mounted on a support frame, and the front face of a porous acoustical absorber, the forward air space, the front fabric and the porous absorber collectively acting as acoustical absorbing chamber, wherein oppositely disposed end panels of the front fabric extend around opposing side frame members of one or more frame structures of the support frame and are connected to a pair of spaced apart retaining struts disposed between the side frame members, the distance between the retaining struts adjustable by rotating one or more threaded tension adjusters thereby stretching or relaxing the front fabric across the support frame to adjust the frequency at which sound absorption will be maximized. |
| 主权项 |
1. An acoustically absorptive panel comprising:
a porous acoustical absorber having a planar configuration and a front facing, a support frame for mounting on a planar surface, said support frame including one or more frame structures, each of said one or more frame structures having one or more pairs of parallel, spaced apart, frame side members, each of said frame side members having a forward face and a side face, an acoustically transparent front fabric stretch-mounted on said support frame in parallel alignment with the front facing of said porous acoustical absorber, said front fabric having one or more pairs of oppositely disposed end panels, a forward air space bounded by the front facing of said porous acoustical absorber and said front fabric, said forward air space having a depth defined by the distance between the front facing of said porous acoustical absorber and said front fabric, said porous acoustical absorber, said air space and said front fabric collectively forming and acting as a forward acoustical absorbing chamber capable of absorbing a range of sound frequencies, one or more tension adjusters connected to one pair of frame side members of each of said one or more frame structures, and a pair of spaced apart retaining struts disposed inwardly from and parallel to one pair of frame side members of each of said one or more frame structures and operatively connected to one of said one or more tension adjusters, so that by manipulation of said tension adjuster the distance between said pair of retaining struts can be adjusted, each end panel of each of said one or more pairs of end panels of said front fabric extending across the forward face and around the side face of one of said frame side members and secured to one of said retaining struts, wherein, by manipulating said one or more tension adjusters, said front fabric may be stretched across said one or more frame structures or relaxed. |
