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
Electrode composition with enhanced performance characteristics
Garden tool handle
PEGylated, extended insulins
Atomic oscillator and manufacturing method
Antitumoral compounds
Method of manufacturing a plurality of electronic assemblies
Generating package profiles in software package repositories using selective subsets of packages
  Randomly Featured Patents
Underwater transducer and projector therefor
Lounge chair with body-accommodating openings
Powder-projecting type recording apparatus with transfer medium
Vibration damped rivet bucking tool
Processes for the production of tri-organo-monoalkoxysilanes and process for the production of tri-organo-monochlorosilanes
PLL circuit and data read-out circuit
3-Isothiazolones as biocides
Photomask for obtaining a graded pattern profile on a photoresist
Safety belt takeup means
Mold for temporary football kicking tee