Matches 1 - 47 out of 47


Match Document Document Title
8931589 Damper arrangement and method for designing same  
A damper arrangement (10) has a first Helmholtz damper (11) connected in series to a second Helmholtz damper (12). The resonance frequency of the first Helmholtz damper (11) and the resonance...
8661822 Acoustically stiffened gas turbine combustor supply  
In one embodiment, a system includes a variable geometry resonator configured to couple to a fluid path upstream from a combustor of a turbine engine. The variable geometry resonator is configured...
8443931 Noise reduction of supersonic jet engines  
A jet engine adapted for reducing far-field noise levels is disclosed. The jet engine has a plurality of flap assemblies that are disposed around a perimeter of an exhaust port of the jet engine....
8422714 Speaker with acoustic chamber  
A speaker with acoustic chamber is provided. The speaker includes a main body and an acoustic chamber fixed to the main body. The acoustic chamber can be converted between a collapsed state and an...
8356476 Diesel silencer capable of Tier 3 or Tier 4 operation  
A Tier 4 ready silencer that can accept both DOCs and DPFs to meet Tier 3 and can interface with an SCR system to meet Tier 4. The invention includes a silencer compartment with empty...
8162101 Ram intake unit having a sound absorbing structure  
A ram intake unit mounted on a front portion of a frame structure of a motorcycle includes an acoustic material disposed along an inner wall of a ram air intake duct for absorbing induction...
7735601 Engine noise  
In order to provide noise suppression, bumps or undulations are provided on a nozzle surface in order to vary the convergent-divergent ratio between that surface and an opposed nozzle surface. By...
7533760 Noise reduction tubes  
The invention uses tubes for the reduction of radiated duct noise. The tubes may be used to attenuate narrow band noise by diverting a portion of the acoustic energy through the tubes back into...
7497300 Noise reduction tubes  
The invention uses tubes for the reduction of radiated duct noise. The tubes may be used to attenuate narrow band noise by diverting a portion of the acoustic energy through the tubes back into...
7278514 Acoustic noise filter  
An acoustic filter is provided with a single flow chamber for exposure of a flexible rubber layer to liquid undergoing flow through the flow chamber with noise producing acoustic energy therein....
7100736 Serviceable muffler  
A serviceable muffler (20) has an end plate (34) releasably clamped (36) to an open end (30) of a muffler body (26) and permitting access to an internal catalytic or filter element (28) for...
7055648 Assembly and method for fan noise reduction from turbofan engines using dynamically adaptive Herschel-Quincke tubes  
An assembly useful in reducing aircraft engine noise such as turbofan engine noise (730) comprises: (i) at least one tube “H-Q” having an inlet end (738), an outlet end (740) and a central tube...
7055484 Multiple frequency Helmholtz resonator  
The tunable resonator is coupled to the engine speed control such that the resonator is set to a different frequency range when the engine speed is changed. The frequency range is changed by...
6932189 Device for noise structuring in a motor vehicle  
A device for noise structuring in a motor vehicle has a plurality of gas-carrying lines connected to an internal combustion engine. At least two of the gas-carrying lines are acoustically linked...
6915876 Exhaust processor with variable tuning system  
An exhaust processor comprises a Helmholtz resonance chamber with a variable tuning throat. The tuning frequency of the exhaust processor changes as the outlet opening from the variable tuning...
6910550 Muffler arrangement for an internal combustion engine  
A muffler arrangement includes an exhaust-gas muffler, which is subdivided into an inlet space and an outlet space. An exhaust-gas stub of an internal combustion engine opens into the inlet space....
6901752 Exhaust processor with variable tuning system and method of operating such exhaust processor  
An exhaust processor has an exhaust tube and a cover mounted for rotation at least partially around the exhaust tube to adjust the tuning frequency of the exhaust processor. A method of operating...
6896100 Noise reducing apparatus and exhaust nozzle for jet engine  
In order to reduce noise effectively and to provide a light-weight noise reducing apparatus and an exhaust nozzle for a jet engine, a mixer for mixing an exhaust gas and an external air is...
6766027 Elliptical flushmount speaker  
An elliptical speaker system is provided for in-wall/in-ceiling mounting. The speaker system comprises an elliptical speaker frame or bracket defining a speaker front plane having a generally...
6634457 Apparatus for damping acoustic vibrations in a combustor  
An apparatus for damping acoustic vibrations in a combustor as well as a corresponding combustor arrangement with the apparatus. The apparatus includes a Helmholtz resonator (4) that can be...
6494290 Noise suppressor with a bypass resonator  
A silencer is disclosed with a bypass resonator (4; 9, 12) connected by at least one tubular connection (3a, 3b; 7, 8; 13) to a sound-transmitting channel (1). The tubular connection (3a, 3b) can...
6427801 Apparatus for reducing noise in the jet engine  
A apparatus and method for augmenting the thrust of a jet engine while reducing the noise generated thereby, including extending the thrust reverser sleeve, exposing the cascades while retaining...
6367580 Sound adjustable tail pipe structure  
A sound adjustable tail pipe structure includes an adjuster secured in a rear section of a tail pipe which defines a first oblong slot. The adjuster includes a tube having a first end provided...
5821472 Supersonic aircraft exhaust noise suppression system  
A method of reducing noise from a jet engine at a distance D from the engine comprising the step of up-shifting frequencies of noise from the jet engine to higher frequencies to cause increased...
5801341 Mechanism of noise suppression system for a supersonic aircraft  
A noise suppression system for a jet engine of an aircraft having a device for blocking a flow of exhaust gases down the exhaust nozzle of the engine, and a device for separating the exhaust gases...
5291672 Sound suppression mixer  
A gas turbine engine flow mixer includes at least one chute having first and second spaced apart sidewalls joined together at a leading edge, with the sidewalls having first and second trailing...
4501393 Internally ventilated noise suppressor with large plug nozzle  
A jet engine noise suppressor particularly adapted for supersonic aircraft. The nozzle (10) has an internal wall surface (70) around a generally centrally positioned body (50) and an annular area...
4217756 Vortex mixers for reducing the noise emitted by jet engines  
Apparatus for internally mixing fan exhaust with primary exhaust forward of the nozzle exit plane of a turbofan engine having an outer engine cowling, a splitter wall structure and a tail plug...
3820626 METHOD OF AND DEVICE FOR ATTENUATING THE NOISE PRODUCED BY A JET ENGINE NOZZLE  
1364007 Jet propulsion nozzles - silencing SOC NATIONALE D'ETUDE ET DE CONSTRUCTION DE MOTEURS D'AVIATION 12 Sept 1972 [23 Sept 1971] 42308/72 Heading F1J The invention relates to a method of...
3695387 SOUND SUPPRESSION SYSTEM FOR FAN JET ENGINES  
A sound suppression system for a fan jet engine having a primary nozzle for discharging engine exhaust gases and a secondary nozzle surrounding and spaced from the primary nozzle to form therewith...
3687222 DEVICE FOR DAMPING THE NOISE PRODUCED BY A GAS JET ESCAPING FROM A DUCT  
A device for damping the noise produced by a jet escaping from a duct in ticular a jet engine nozzle, including silencer elements that are movable by control devices to project into the jet for...
3682269 DEVICE FOR REDUCING THE NOISE OF A GASEOUS JET  
A device for reducing the noise emitted by a gaseous jet as it escapes from a pipe, particularly the noise of a propulsive jet of a jet powerplant such as a gas turbine jet propulsion engine,...
3666044 JET ENGINE SOUND SUPPRESSOR  
An elongated tubular jet engine nozzle including inner wall surfaces, sound wave trap means extending along and spaced about said inner wall surfaces operative to effectively trap and absorb a...
3647020 JET PROPULSION APPARATUS AND OPERATING METHOD  
Vanes are mounted on jet engine nozzle or a plug associated therewith for movement between a position wherein they permit normal flow of the exhaust gas of the engine in a direction parallel with...
3637041 SOUND SUPPRESSION SYSTEM FOR FAN JET ENGINES  
System is intended for use with a jet engine having an engine separator sleeve for discharging turbine exhaust gases, and an engine casing surrounding and spaced from the separator sleeve to form...
3618700 RETRACTED NOISE SUPPRESSION SYSTEM  
A mechanism for attenuating sound pressure levels in the fluid passageways of an aircraft jet engine comprising a plurality of pivotally attached vane members each having a pair of oppositely...
3613826 SYSTEM FOR REDUCING NOISE CAUSED BY A STREAM OF FLUID  
A system for reducing noise caused by a stream of fluid comprises a fluid ejection conduit comprising two series of ambient fluid intake vents distributed around its periphery; and Two series of...
3605939 DEVICE FOR REDUCING THE NOISE PRODUCED BY FLUID FLOW ESCAPING FROM A NOZZLE  
Multiported and multinozzled sectors are pivotally mounted to swing between positions cooperatively spanning a jet engine exhaust duct and retracted positions alongside the wall of such duct. Such...
3575259 RETRACTABLE NOISE SUPPRESSION SYSTEM  
An aircraft engine air inlet noise suppression foil means comprising a plurality of segmented acoustically treated foil members stowed in recesses along the wall of the inlet passageway during...
3563340 RETRACTABLE SILENCING FLAPS FOR JET ENGINE INTAKE  
The invention relates to a silencing system for pipes which carry fluids, more particularly fluid inlet pipes for turbojet engines, and is characterized in that the silencing system comprises...
3543877 SILENCER DEVICE FOR AN EJECTOR-TYPE JET PROPULSION NOZZLE  
3533486 JET ENGINE SILENCER WITH RETRACTABLE SOUND ABSORBING BODY  
1,274,680. Noise suppression means; gas turbine ducted fan engines. GENERAL ELECTRIC CO. Oct.30, 1969 [Nov. 8, 1968], No.53136/69. Headings F1G and F1J. The invention relates to a noise suppressor...
3422624 GAS TURBINE ENGINE  
3344883 Silencers for jet propulsion engines or the like  
1,106,856. Jet propulsion nozzles - noise suppressing. SOCI•T• NATIONALE D'ETUDE ET DE CONSTRUCTION DE MOTEURS D'AVIATION. July 7, 1966 [July 28, 1965], No. 30659/66. Heading F1J. The invention...
3344884 Silencers for jet propulsion engines or the like  
1,106,856. Jet propulsion nozzles - noise suppressing. SOCI•T• NATIONALE D'ETUDE ET DE CONSTRUCTION DE MOTEURS D'AVIATION. July 7, 1966 [July 28, 1965], No. 30659/66. Heading F1J. The invention...
3161257 Jet pipe nozzle silencers  
3095697 Noise suppression nozzles with thrust reversal provision for jet engines  

Matches 1 - 47 out of 47