Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Aircraft drive
Display for gloves
Plants and seeds of hybrid corn variety CH450823
Semiconductor device with hetero-junction bodies
Facial recognition using a sphericity metric
Transmission apparatus, receiving apparatus, method, and storage medium
Flexible pouch
  Randomly Featured Patents
Multicylinder internal combustion engine with individual cylinder assemblies
Method and apparatus for monitoring a metal layer during chemical mechanical polishing
Process and apparatus for manufacturing bags
Seat for vehicles
Office printer
2-phenylethylamino derivatives as calcium and/or sodium channel modulators
Information recording/reproducing apparatus with means for substituting predetermined good sectors for defective ones
Tunable optical array device comprising liquid cells
Frame for a material handling vehicle
Spring coiling machine with hybrid servo motor-cam torsion control