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Sound absorbing body

Patent Number: 8443935
Publication Date: 2013-05-21
Inventor:

A sound-absorbing body having sound-absorbing characteristics suitable for in-home and car audio systems, wherein the indoor echo of sound wave output from a speaker or echo in a speaker enclosure should be reduced. Namely, showing flat sound-absorbing properties while maintaining a high sound-absorbing ratio in the medium tone range, having a simple structure, is easily installed, water-resistant and is decorative. Specifically, a sound-absorbing body having a plurality of porous members ...

Acoustic resistance member and method for making the same

Patent Number: 8443934
Publication Date: 2013-05-21
Inventor:

An acoustic resistance member includes an air-shielding layer which does not allow air to pass through such that acoustic waves do not propagate, and an acoustic resistance layer which allows air to pass through such that acoustic waves propagate. The air-shielding layer is composed of a resin containing a coloring agent, and a part of the air-shielding layer is ...

Tubular acoustic insulating element

Patent Number: 8443933
Publication Date: 2013-05-21
Inventor:

An exhaust system composed of a plurality of components for an internal combustion engine for connecting to a manifold, the exhaust system includes at least one first section, which is provided indirectly or directly after the manifold in the flow direction, and a second section, which is directly adjacent thereto in the flow direction, wherein the two sections are connected to each other by a mechanical decoupling element. The resonant oscillations in the range above 600 Hz are to be ...

Working machine

Patent Number: 8443932
Publication Date: 2013-05-21
Inventor:

A working machine is provided with a revolving upperstructure, working equipment, an engine compartment, a counterweight, a muffler, and an exhaust path for releasing exhaust gas, which has been discharged from the muffler, to an outer side of the revolving upperstructure. The exhaust path includes a tailpipe connected to the muffler and an exhaust pipe for releasing exhaust gas, which has been discharged from the tailpipe, to the outer side of the revolving upperstructure. The ...

Noise reduction of supersonic jet engines

Patent Number: 8443931
Publication Date: 2013-05-21
Inventor:

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. Each flap assembly is movable between a first position and a second position. The jet engine also includes a plurality of actuators respectively coupled to the plurality of flap assemblies. Each actuator is configured to selectively move the coupled flap assembly between the first and second ...

Method and apparatus for a loudspeaker assembly

Patent Number: 8443930
Publication Date: 2013-05-21
Inventors: ; ;

A method and apparatus for providing a loudspeaker assembly is provided. In accordance with at least one embodiment, apparatus is provided comprising a ground plane, a loudspeaker driver mounted in a loudspeaker driver aperture of the ground plane, and a grille positioned relative to the ground plane such that a distance between the grille and the ground plane decreases with increasing distance from the loudspeaker driver. The loudspeaker assembly can be used to replace ceiling tiles having ...

Acoustically tunable sound absorption articles

Patent Number: 8439161
Publication Date: 2013-05-14
Inventors: ; ;

The present invention provides a tunable sound absorption facing which includes a cellulosic web and a nonwoven web entangled together. The facing has a controllable air flow ...

Acoustic suppression systems and related methods

Patent Number: 8439160
Publication Date: 2013-05-14
Inventors: ;

An acoustic suppression system for absorbing and/or scattering acoustic energy comprising a plurality of acoustic targets in a containment is described, the acoustic targets configured to have resonance frequencies allowing the targets to be excited by incoming acoustic waves, the resonance frequencies being adjustable to suppress acoustic energy in a set frequency range. Methods for fabricating and implementing the acoustic suppression system are also ...

Exhaust muffler for internal combustion engines

Patent Number: 8439159
Publication Date: 2013-05-14
Inventor:

A new and improved muffler for use particularly with internal combustion engines which utilizes a tube assembly composed of a plurality of laterally nested perforated and non-perforated tubes in direct supporting lateral engagement with each other wherein the perforations provide direct communication of exhaust gases therebetween and wherein the tube assembly is supported at opposite ends by frustoconical entrance and exit collars, the larger ends of the collars being crimped or otherwise ...

Acoustic resonator and sound chamber

Patent Number: 8439158
Publication Date: 2013-05-14
Inventors: ;

An acoustic resonator adaptable to a sound chamber is designed to decrease a sound pressure while increasing a particle velocity of medium particles in a low frequency range without increasing the overall size thereof. The acoustic resonator is constituted of a pipe member having one opening end and a resistance member embracing a high resistance region and a low resistance region. The resistance member is inserted into the pipe member such that one end thereof matches the opening end of ...

Engine

Patent Number: 8439157
Publication Date: 2013-05-14
Inventor:

An object of the present invention is to provide a muffler mounting structure configured to be able to prevent fastening parts from slackening by reducing the thermal conductivity from an exhaust port to the muffler mounting bosses and an engine including the muffler mounting structure. An engine of the present invention 100 includes a cylinder block 101 or the cylinder head 10 constitutes a combustion chamber 105 with a piston 104, an exhaust port ...

Muffler with controlled pressure release

Patent Number: 8439156
Publication Date: 2013-05-14
Inventor:

A plastic muffler is configured to provide a controlled mode for releasing exhaust gas pressure during an over-pressurization event. The plastic muffler has a plastic casing that includes at least one pressure relief feature. The pressure relief feature allows exhaust gas to escape from the plastic casing when internal exhaust gas pressure exceeds a predetermined pressure ...

Firearm sound suppressor

Patent Number: 8439155
Publication Date: 2013-05-14
Inventors: ;

A suppressor for a firearm is provided, wherein the suppressor can be selectively oriented relative to the firearm. The suppressor has an elongate body, a piston assembly and a cam assembly. A piston of the piston assembly can be fixedly attached to the barrel of a firearm. An indexing ring is radially fixed relative to the piston. The cam lever is selectively movable between a second position, in which the indexing ring is fixed relative to the elongate body, and a first position, in which ...

Air-film vibration damping apparatus for windows

Patent Number: 8439154
Publication Date: 2013-05-14
Inventors: ;

An improved vibration damping apparatus is provided for use with window structures, including windows used in vehicles, aircraft, and spacecraft. The vibration damping system includes at least two separate layers of solid material that are typically substantially clear at visible wavelengths, in which the two layers are spaced-apart by a predetermined distance to form a space or gap therebetween. This gap will be of a size and shape to enhance vibration damping when it is filled with a ...

Method and apparatus for a loudspeaker assembly

Patent Number: 8439153
Publication Date: 2013-05-14
Inventors: ;

The present invention relates to a loudspeaker assembly and a method of assembling a loudspeaker assembly. In one or more embodiments, the invention comprises forming a front baffle comprising a first driver mounting portion, an intermediate portion, and an edge mounting portion. A first driver is installed in the first driver mounting portion proximate to a first driver aperture. A rear baffle is formed from a second material, which, in one or more embodiments, is less stiff than the first ...

Acoustic barrier

Patent Number: 8434591
Publication Date: 2013-05-07
Inventors: ;

An acoustic dampening panel comprising: (a) a first layer of expanded polypropylene; (b) a solid layer having a surface weight between 2.4 kilograms per meter squared and 25 kilograms per meter squared; and, (c) a second layer of expanded polypropylene, where the first and second layers of expanded polypropylene sandwich the solid layer therebetween. The acoustic dampening panel may further comprise a fourth layer comprising a metal skin, where the solid layer and the metal skin sandwich ...

Muffler

Patent Number: 8434590
Publication Date: 2013-05-07
Inventor:

The present invention relates to a muffler (8) for an exhaust system (6) of a combustion engine (1), more preferably of a motor vehicle, with a housing (14) comprising at least one exhaust gas inlet (18) and at least one exhaust gas outlet (19), with a pipe arrangement (20) for conducting exhaust gas arranged in the housing (14), which comprises at least one pipe section (21) running within the housing (14), and with a ...

Obstruction device for reducing noise emitted from a blower

Patent Number: 8434589
Publication Date: 2013-05-07
Inventors: ; ; ;

A method and system for reducing or eliminating banding in a rendering device caused by pressure pulsations from a blower. The pressure pulsation frequency resulting from a plurality of pressure pulsations propagated from a blower can be reduced by forming an obstruction device at an outlet of the blower. Total airflow and total pressure propagated by the blower are maintained by modifying or removing an existing restrictor plate thereby reducing acoustic noise associated with the pressure ...

Exhaust device for vehicle internal combustion engine

Patent Number: 8434588
Publication Date: 2013-05-07
Inventor:

In a exhaust device for an vehicle internal combustion engine, an exhaust pipe (20) of an engine (11) branches at a branching point (B) into a downstream-side first branch pipe (32) and a downstream-side second branch pipe (33). A first silencer (36) is attached to the first branch pipe (32), and a second silencer (37) is attached to the second branch pipe (33). The first branch pipe (32) and the second branch pipe (33) ...

Tubular body soundproof cover and covered tubular body

Patent Number: 8434587
Publication Date: 2013-05-07
Inventors: ;

A purpose is to provide a tubular body soundproof cover and a covered tubular body, for which elastic deformation of the tubular body is unlikely to be inhibited. The tubular body soundproof cover includes a sound absorbing layer arranged on outside in an axially perpendicular direction of a tubular body having tubular body side curved sections; a skin layer arranged on outside in the axially perpendicular direction of the sound absorbing layer; and cover side curved sections arranged on ...

Sound insulation in a refrigerant circuit

Patent Number: 8434586
Publication Date: 2013-05-07
Inventor:

A muffler device for a refrigerant circuit with refrigerant containing refrigerant oil comprises a housing in which an upper muffler chamber and a lower muffler chamber are arranged, whereby the upper muffler chamber has an upper feed opening that can be connected to the refrigerant circuit, and the lower muffler chamber has a lower discharge opening that can be connected to the refrigerant circuit, and whereby a muffler partition is arranged between the upper and lower muffler chambers, ...

Noise reduction device for turbojet nacelle with mobile chevrons, and associated nacelle

Patent Number: 8430203
Publication Date: 2013-04-30
Inventors: ;

The invention relates to a turbojet nacelle (1) and to an aeroacoustic noise reduction device for said nacelle, the nacelle comprising a nozzle (10) on the downstream end thereof, said nozzle (10) comprising an inner wall inside which a first flow from the turbojet circulates and an outer wall (102) outside which a second flow corresponding to the surrounding outside air circulates. The invention also relates to an aeroacoustic noise reduction device (20) ...

Compact high-pressure exhaust muffling devices

Patent Number: 8430202
Publication Date: 2013-04-30
Inventors: ; ; ; ;

Compact, high-pressure exhaust muffling devices are disclosed. Some example muffling devices may include an inner flow conditioner including an inlet configured to convey a pressurized fluid flow into an inner flow conditioner interior. The inner flow conditioner may include a plurality of inner flow conditioner holes. The muffling device may include an exhaust can disposed substantially around the inner flow conditioner and arranged to receive the pressurized fluid flow via the inner flow ...

Speaker enclosure

Patent Number: 8430201
Publication Date: 2013-04-30
Inventor:

The present invention relates to speaker enclosures utilizing the golden ratio geometrically throughout the design to reduce reflections, resonance and phase shifting, and to improve the transient response. Enclosures can be box-shaped, trapezoidal, suspended or otherwise configured. The enclosure has a driver wall, a baffle and a rear wall. The driver wall and baffle define a front chamber, and the baffle and rear wall define a rear chamber. The volumetric ratio between the rear chamber ...

Speaker apparatus

Patent Number: 8430200
Publication Date: 2013-04-30
Inventor:

A speaker apparatus according to the present invention includes a phase inversion-type enclosure in which a speaker unit and a bass reflex port are installed, the bass reflex port having a tubular body whose hollow cross-sectional area gradually becomes smaller from one opening side toward an inside of the bass reflex port in an axial direction of the bass reflex port, and a length in one direction of the hollow cross section of the tubular body not changing and constant along the axial ...

Sound shell

Patent Number: 8430199
Publication Date: 2013-04-30
Inventor:

A performance shell (1) for outdoor music performance including a platform (2) providing a performance area for receiving at least one sound source, the platform combining unitarily with a rear wall reflectors (5), side wall reflector (6) and a canopy reflector (7) to define an enclosure having a front opening (11) for communicating acoustically with an open air audience area. The canopy reflector includes a main portion (8) extending above ...