Patent ID: 8025124
Filing Date: 2011-09-27
Classification: F16F

Abstract:
1. A vibration absorber comprising: a) a viscoelastic layer for distribution over a modally dense vibrating structure having an effective mass and that when excited by a broadband input excitation, the vibrating structure exhibits a frequency response spectrum in which a first and a second targeted natural frequency are present b) a plurality of discrete mass elements in contact with said viscoelastic layer wherein a first portion of the discrete mass elements are tuned to absorb vibration at the first targeted natural frequency and a second portion of the discrete mass elements are tuned to absorb vibration at the second targeted natural frequency of the vibrating structure, wherein the mass ratio of the cumulative mass of said discrete mass elements tuned to a natural frequency of the vibrating structure to the effective mass of the vibrating structure at the corresponding natural frequency is less than about 0.04.