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Passive noise attenuation system

Patent Number: 8109362
Publication Date: 2012-02-07
Inventors: Vijaykant, Sadasivuni; Agrawal, Ajay K.

A passive noise attenuation device and system is provided having a reticulated open-cell porous structure configured to acts as a passive control device in order to mitigate combustion noise and instability problems in combustion systems. A porous inert media structure is placed downstream of the reaction zone of a combustion chamber to dissipate noise and/or instability generated upstream in the flame. The porous inert media also limits and/or disintegrates vortical structures in the flame ...

Solid-borne sound reducing structure

Patent Number: 8109361
Publication Date: 2012-02-07
Inventors: Tanaka, Toshimitsu; Tsugihashi, Kazuki

It is an object of the present invention to provide a solid-borne sound reducing structure which is able to reduce solid-borne sound with a simple configuration, highly durable, and being less degraded.

There is provided a solid-borne sound reducing structure (100) in which a surface plate part (1) including a gas ventilating part (1a) which allows gas to pass through along a thickness direction is disposed by means of an outer peripheral wall part ...

Method and apparatus for a loudspeaker assembly

Patent Number: 8109360
Publication Date: 2012-02-07
Inventors: Stewart, Jr., William Cameron; Evans, Andrew; Hudson, Michael; Edwards, Andrew C.

A method and apparatus for providing a loudspeaker assembly is provided. In accordance with at least one embodiment, a method is provided for mounting a loudspeaker driver in a loudspeaker driver aperture defined in a ground plane and installing a grille in relation to the ground plane such that a distance between the grille and the ground plane decreases as the distance from the loudspeaker driver increases. In accordance with at least one embodiment, apparatus is provided comprising a ...

Ear protector

Patent Number: 8109359
Publication Date: 2012-02-07
Inventor: Skov, Roman

The invention describes an ear protector (1) comprising a resilient band (2), the free ends of which each have arranged thereon an earplug (4). The band (2) includes a first area (2a) whose center line (2a′) merges under an angle α with an additional area (2b). When in use, the band is pivotable in the user's ears about an axis of rotation (3′) extending through the earplugs (4). In order to implement ...

Temporary noise control curtain wall system

Patent Number: 8104574
Publication Date: 2012-01-31
Inventor: Kellenaers, Steve

A temporary sound barrier system is provided, with two support columns, a stiffening structure fixed between the support columns, and at least two sound proofing curtain elements having top and bottom edges attached to the two support columns and over the stiffening structure. The curtain elements preferably at least partially overlap, the overlapping portions of the curtain elements being sufficiently free to move with respect to one another to permit a substantial amount of wind to pass ...

Heat shield and an insulating isolator for the heat shield

Patent Number: 8104573
Publication Date: 2012-01-31
Inventors: Schweiggart, Franz; Giaimi, Giacomo; Oxenknecht, Ernest; Schimmele, Oliver

An insulating isolator for a heat shield has a unitary first land, a bead portion, a second land and a half bead. The first land defines a fastener aperture. In one case, a plurality of circumferentially spaced apart petals is formed in the isolator. The petals may be separated by gaps. In another case, a set of circumferentially spaced apart apertures are formed in the isolator.

The heat shield may have at least two disk apertures. Two metallic disks are located in the area of at ...

Spin muffler

Patent Number: 8104572
Publication Date: 2012-01-31
Inventor: Butler, Boyd L.

A muffler for attenuating acoustic noise in a gas flow which includes a casing having an inlet and an outlet, such that the gas flow passes through the casing from the inlet to the outlet. The muffler also includes an acoustic trap disposed within the casing and which spans the distance between opposing top and bottom walls of the casing. The acoustic trap further comprises a first arcuate deflector having a concave frontside surface configured to direct the gas flow from the inlet through ...

External cylinder and silencer provided with the external cylinder

Patent Number: 8104571
Publication Date: 2012-01-31
Inventor: Nakajima, Shoichi

A silencer capable of preventing a damage of a metallic layer formed on an inner surface of an external cylinder formed from CFRP, and the external cylinder for the silencer. The silencer 1 includes the external cylinder 2, an internal cylinder 3 and an acoustic absorbent (not shown). A posterior end 2r of the external cylinder 2 is detachably provided with a tail cap 4. An anterior end 2f of the external cylinder 2 is ...

Suppressor

Patent Number: 8104570
Publication Date: 2012-01-31
Inventors: Miller, Brett Kent; Sawyer, William Scott

A suppressor for suppressing sounds generated by the discharge of a firearm, the discharge generating propellant gases is disclosed. The suppressor includes a host tube. The host tube is generally hollow and generally cylindrical. The suppressor also includes a monolithic baffle stack inserted within the host tube and secured to a first end of the host tube. The monolithic baffle stack includes a first end that includes a first hole. The monolithic baffle stack also includes a second end ...

Speaker cabinet system

Patent Number: 8104569
Publication Date: 2012-01-31
Inventor: Klein, Daniel B.

A speaker cabinet includes a first surface oriented generally along a first plane and a second surface oriented generally along a second plane. The second plane is generally orthogonal to the first plane. A third surface may be positioned between the first and second surfaces and may be oriented generally along a third plane that intersects the first plane and the second plane. The third surface may be configured to redirect an audio ...

Seismic gun assembly for shooting into a bore hole

Patent Number: 8104568
Publication Date: 2012-01-31
Inventors: Luchini, Chris; Morley, Richard

A seismic gun assembly comprising a barrel and guide tube assembly for delivering a projectile to the bottom of a bore hole with a non-line-of-sight section. The guide tube being either a large diameter guide tube or a tight fitted guide tube. The large diameter guide tube allowing the projectile to perform shallow angle bounces to reach the bottom of a non-line-of-sight bore hole. The tight fitted guide tube allows the projectile to ride the inner wall of the guide tube to reach the bottom ...

Porous nonwoven scrims in acoustical panels

Patent Number: 8100226
Publication Date: 2012-01-24
Inventors: Song, Weixin D.; Cao, Bangji; Palm, Gregory

An acoustical building panel and method of manufacturing it are disclosed. Embodiments of the panel include a porous nonwoven scrim, a coating deposited on the scrim, a base mat, and an adhesive deposited on either the base mat or the scrim in a discrete form such as in droplets. Embodiments of the method of manufacture include steps of perforating the base mat, applying the adhesive to the base mat in the discrete form, laminating the scrim onto the base mat, and applying the coating to ...

Room dampening panel

Patent Number: 8100225
Publication Date: 2012-01-24
Inventors: Bartha, Andrew; Flanders, Andrew E

An acoustic treatment room dampening panel 10 is arranged to support at least three layers of material 3 with multiple through holes 2. Each layer of material with through holes are spaced apart, with through holes off set between layers, such that air flow is restricted and turbulence created, thus dissipating standing wave energy. The panels are intended for flush mounting against walls or ceiling at the apex of a room to help dissipate standing wave energy which ...

Suppressor with poly-conical baffles

Patent Number: 8100224
Publication Date: 2012-01-24
Inventor: Olson, Douglas D

A firearm suppressor includes at least one baffle disposed within a cylindrical housing. The baffle includes a distal-facing conical baffle having a wider end and an opposing narrower end; and a proximal-facing conical baffle intersected by the distal-facing conical baffle such that the narrower end of the distal-facing conical baffle extends beyond a wider end of the proximal-facing baffle, wherein a central bore extends through both the distal-facing conical baffle and the proximal-facing ...

Tapered vent for a hearing instrument

Patent Number: 8096383
Publication Date: 2012-01-17
Inventors: McBagonluri, Fred; Saltykov, Oleg

A vent having a reduced cross-section or taper permits the fabrication of very small hearing instruments while providing the necessary openings for the receiver tube and the vent in the tip of the instrument. The reduced cross-section provides sufficient clearance for the full cross-section of the receiver tube, without sacrificing the performance of the vent. The modified vent may be created in a CAD environment using Boolean modeling ...