Patent ID: 8172040
Filing Date: 2012-05-08
Classification: E04B,F16F,G10K,Y10T

Abstract:
1. A method for controlling vibration or sound in a structure, comprising positioning or forming a vibration or acoustic absorber within or on said structure, wherein said vibration or acoustic absorber comprises an elastic layer formed from loose acoustic or insulation material having height, width, and depth dimensions, and a plurality of discrete masses distributed within said elastic layer, wherein said step of positioning or forming is performed by blowing said loose acoustic or thermal insulation material together with said plurality of discrete masses into or on said structure to form said vibration or acoustic absorber comprised of said elastic layer with said plurality of discrete masses distributed within said elastic layer, wherein individual masses of said plurality of masses are deposited at different levels within said vibration or acoustic absorber and are spaced away from each other throughout said height, width and depth dimensions, so as to alter a stiffness or spring rate of said loose acoustic or thermal insulation material which supports each of said individual masses thereby enabling attenuation of vibration or accoustic waves at multiple resonance frequencies.