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
Sensor chip, sensor cartridge, and analysis apparatus
Orbing and lighting systems
Vehicle having power supply apparatus
Suspension with flexure having laminated structure and bonding pads on opposing surfaces thereof, and head gimbal assembly and disk drive unit with the same
Method, system and computer program product for managing funds in custodial deposit accounts
Hydrothermal synthesis of nanocubes of sillenite type compounds for photovoltaic applications and solar energy conversion of carbon dioxide to fuels
Sending notification of event
  Randomly Featured Patents
Methods for introducing reactive secondary amines pendant to polymers backbones that are useful for diazeniumdiolation
Enclosed golf bag with rotary cap
Door lock device for a motor vehicle
Sag control of isopipes used in making sheet glass by the fusion process
Color photographic light-sensitive material comprising a combination of cyan couplers and UV absorbers
Mechanism for compacting material
Power-assisted steering system
Paper folding machine with feeder
Silver halide photographic material
Method for measurement of the distance between a component which is moved past a reference surface and that reference surface, and a measurement system for carrying out the method