Tuned sound barriers
AssigneeGeneral Electric Company
InventorDavid G. Holmes
Life of this patent
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Abstract
A tuned sound barrier for machines which radiate sound primarily at a few constant, discrete frequencies includes an array of mechanical resonators distributed over the surface of a sound barrier. Each resonator of the array is tuned to present a high mechanical impedance to transmission of mechanical vibration at one of the discrete frequencies emitted by the source machine. The tuned sound barrier may be either a free-standing sound barrier or an attachment to a housing for the machine.
Claims13
A tuned sound barrier for reducing the noise emitted by a vibrating source comprising:
- a barrier sheet disposed adjacent said source;
- and
- a plurality of resonators attached to and uniformly distributed over a major surface of said sheet;
- each one of said plurality of resonators being tuned to present to said barrier sheet a large mechanical impedance to vibratory motion of said barrier sheet at a specific frequency emitted by said source.
A tuned sound barrier for reducing noise emitted by a high voltage transformer operating at a predetermined line frequency comprising:
- a plurality of planar source barrier walls surrounding said transformer and disposed adjacent thereto;
- each of said barrier walls comprising a first planar metallic sheet and a second metallic sheet bonded to a major surface of said first sheet;
- and
- said second metallic sheet includes a plurality of paired cantilever resonators punched into said second sheet and projecting therefrom in a direction away from said first sheet, and each of said paired cantilevered resonators is tuned to present to said first sheet a large mechanical impedance to vibratory motion of said first sheet at a frequency of twice said line frequency or a harmonic frequency thereof.
Dependencies are inferred from the claim text.