Home | Links | Contact Us | More About Intellectual Property | Bookmark
Search patents:
Home Navigation and GPS Closed-cavity-noise-suppressor

 AOS fan modulation systems
OF THE BEST MODE FOR CARRYING OUT THE INVENTION The following detailed description illustrates the ...


 Arrangement for adjusting the sitting position of a vehicle occupant
This application claims the priority of German application 196 51 670.6-14 filed in Germany on Dec. ...


 Manual cut-off system and method for passive safety devices
The present invention has been made in consideration of the aforementioned background. It is a ...


 Engine idle speed control with feedforward power adjustment
The embodiments of the invention in which an exclusive property or privilege is claimed are defined ...


 Electronically controlled steering system
Having described a preferred form of my invention, what I claim and desire to secure by U.S. L...


 Hydrostatic power steering system
Having described a preferred embodiment of my invention, what I claim and desire to secure by U.S. L...


 Electronically controlled power steering system
The invention relates generally to power steering systems and, in particular, to methods and ...


 Undercarriage for adverse terrain vehicle
Referring now to the Drawings, and particularly to FIGS. 1 and 2 thereof, there is shown a ...


 Parking brake release apparatus
I claim: 1. Brake release apparatus for a vehicle having a frame, wheels, a parking brake for at ...


 Method and apparatus for determining stress on hoisting equipment
The invention is directed to a method and apparatus for determining the cumulative load stress on ...


 Closed cavity noise suppressor

Details
Inventors: Motsinger, Russell E.; Vdoviak, John W.;
Assignee: General Electric Company (Cincinnati, OH)
Primary Examiner: Fuller; Benjamin R.
Assistant Examiner:
Attorney, Agent or Firm: Squillaro; Jerome C.

An annular acoustic liner for gas turbine engine ducts comprising Helmholtz resonator chambers wherein the resonator's turnable neck length and chamber depth lie on a surface which is concentric to the liner centerline. In another embodiment of the invention the liner is generally rectangular and the resonator's turnable neck length and chamber depth lie on a surface which is parallel to the duct flow. A more particular embodiment of the invention the duct is an afterburner duct which may have a rectangular or circular cross section.

DETAILED DESCRIPTION Accordingly one form of the present invention provides A Helmholtz resonator-type chamber for attenuating noise in a duct containing a gas flow comprising a chamber and a neck wherein the tunable neck length and chamber resonating depth run in a plane parallel to the gas flow.
In one particular embodiment of the present invention the tunable neck length and chamber resonating depth run in a plane parallel to or concentric to and in the same direction as the gas flow.
In another particular embodiment of the present invention the tunable neck length and chamber resonating depth run in a plane parallel to or concentric to and in a direction perpendicular to the gas flow.
A more particular form of the present invention provides an acoustic liner for a gas turbine engine annular duct comprising a plurality of Helmholtz resonator-type chambers having neck lengths and chamber resonating depths running circumferentially with respect to the duct.
One embodiment of the present invention provides an acoustic liner for a gas turbine engine duct comprising a plurality of Helmholtz resonator type chambers having neck lengths and chamber resonating depths running circumferentially with respect to the duct and wherein the neck occupies a portion of said chamber nearest the gas flow.
Another embodiment of the present invention provides an acoustic liner for a gas turbine engine duct comprising a plurality of Helmholtz resonator type chambers having neck lengths and chamber resonating depths running axially with respect to the duct and wherein the neck occupies a portion of said chamber nearest the gas flow.
Yet Another embodiment of the present invention provides an acoustic liner for a gas turbine engine duct comprising a plurality of Helmholtz resonator type chambers having neck lengths and chamber resonating depths running parallel with respect to the duct and wherein the neck occupies a portion of said chamber nearest the gas flow.
Another more particular embodiment of the invention provides an acoustic liner for a gas turbine engine duct comprises a bifurcated compartment containing two resonating chambers and necks


Related patents
  One-piece engine inlet acoustic barrel
It is a principal objective of the invention to provide an improved acoustic liner jet engine inlet barrel formed from a perforated permeable inner facesheet, a core ...
  Passive reduction of aircraft fuselage noise
OF THE DRAWINGS FIGS. 1a and 1b are simplified sectional views of a portion of a reinforced skin structure 10, specifically, a portion of the fuselage structure 10 of ...
  Extended reaction acoustic liner for jet engines and the like
The present invention specifically addresses and alleviates the above mentioned deficiencies associated with the prior art. More particularly, the present invention ...
  Multi-purpose aircraft
It is an object of the present invention, therefore, to provide a novel twin-engine propeller-driven aircraft (although many features of this invention will be ...
  System for detecting abnormality of steering angle sensor
What is claimed is: 1. A system for detecting the abnormality of a steering angle sensor, comprising a steering angle sensor for detecting the steering angle of a wheel ...
  Power steering apparatus
The present invention has been devised to solve the aforementioned problems. A first object of the present invention is to provide a inexpensive power steering apparatus ...
  Power supply control method, power supply control system and computer program product
OF THE INVENTION (First Embodiment) FIG. 1 shows an example of the entire structure of a power supply control system according to a first embodiment of the present ...
  Actively controlled suspension system for automotive vehicles
It is, in view of the above disadvantages, a principal object of the present invention to provide an actively controlled suspension system for automotive vehicles which ...
  Foot pedal force transducer
Referring to FIG. 1, in an illustration of the in-use application of the foot pedal force transducer of the present invention, the transducer 10 includes a slipper ...
  Method of shortening the braking distance in critical driving situations by sensing brake pedal speed
The invention relates to a method of shortening the braking distance in critical driving situations and, more particularly, to a shortening method which is effected in a ...

0.104

Archive: All patents - Links

Copyright (c)2006 Eipa-patents.org - All rights reserved