Patent ID: 6478110
Filing Date: 2002-11-12
Classification: G10K

Abstract:
A vibration excited sound absorber for reducing the sound radiated from a region of a vibrating surface, said region having an area S, and said sound absorber comprising:a sound radiating element defining a sound radiating surface and a coupling element comprising a member having: a first surface attachable to a first part of the region of the vibrating surface such that a second part of the region with area Sâ€² remains exposed; and a second surface attached to the sound radiating element; said coupling element being operable to couple motion of the region of the vibrating surface to said sound radiating element, so that the sound radiating element is excited into motion by vibration of the region of the vibrating surface; wherein the dynamic response of said sound absorber is tuned so that velocity u of the first part of the region of the vibrating surface causes the sound radiating surface to vibrate with a volume velocity of approximately âˆ’Sâ€²Ã—u at one or more frequencies.