Resources Contact Us Home
Absorbent structure for attenuating noise particular by a rotor-generator noise, and a rotor duct including such a structure

Image Number 4 for United States Patent #7779965.

An absorbent structure for reducing the propagation of soundwaves emitted by noisy devices such as rotors or motors, the structure includes a rigid partition (1), at least one porous wall (4), and separator elements (2) for placing the porous wall (4) at a determined distance from the rigid partition (1), defining cavities (3) of a height h1 between the porous wall (4) and the rigid partition (1), the height h1 being determined to obtain maximum absorption of a given frequency of the emitted soundwaves, wherein includes additional absorption elements for obtaining maximum absorption of at least one additional frequency of the emitted soundwave.

  Recently Added Patents
Method and apparatus for managing communication services for user endpoint devices
Pet burial pod
Compounds for nonsense suppression and methods for their use
Light emitting device
Benzimidazole inhibition of biofilm formation
Matching geometry generation and display of mammograms and tomosynthesis images
  Randomly Featured Patents
System and method for customer loyalty system utilizing referrals
5-Substituted 2-amino-4-arylthiazoles
User created tags for online social networking
Document transport
Image heating apparatus
Method and apparatus for cooling a moving chill substrate
Process for holding together the wires of a package bead ring for tires
Speed governor for internal combustion engines
Coke oven emission control method and apparatus