Tuned sound barriers
First Claim
Patent Images
1. 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.
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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.
52 Citations
13 Claims
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1. A tuned sound barrier for reducing the noise emitted by a vibrating source comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A tuned sound barrier for reducing noise emitted by a high voltage transformer operating at a predetermined line frequency comprising:
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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. - View Dependent Claims (11, 12, 13)
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Specification