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
Apparatus and method for performing lawful intercept in group calls
System and method for enhanced artificial bandwidth expansion
Method and apparatus for analysis of histopathology images and its application to cancer diagnosis and grading
Method for increasing expression of active tumor necrosis factor receptor family member-Ig fusion proteins
Digital photographing apparatus, method of controlling the same, and recording medium for the method
One-dimensional metal nanostructures
  Randomly Featured Patents
Plasma display panel and method of driving the same
Control system for an engine supercharging system
Conveyor unit for conveying flat objects
Ac/dc converting circuit
Apparatus and method for separation and delivery of continuous forms
Wear resisting slide member
Interface unit between a numerical controller and an electric power control circuit
Strap retainer for a carried bag
Illumination apparatus