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
Wireless device with extendable antenna
Sterilizable film for aseptic packaging
Semiconductor memory device and method for driving the same
Techniques for generating and displaying a visual flow of user content through a social network
Tailoring the band gap of solar cells made of liquid silane by adding germanium
Fluorescent molecule and method for detecting target nucleic acid
Redundant parallel operation of motor vehicle electrical system generators
  Randomly Featured Patents
Production and use of normalized DNA libraries
Reversible electrodeposition devices and associated electrochemical media
Recording sheets containing tetrazolium indolinium, and imidazolinium compounds
Method for recording and reproducing information on and from an optical disk having a read-only recorded zone and a writable and readable zone using a spot laser light
Electrode material for electrochemical element and method for production thereof, and electrochemical element
Piezoelectric actuator of ink jet printer head
Internal combustion engine control device
Process for the production of xylene
System and method for improving backup performance of media and dynamic ready to transfer control mechanism