Abstract: An end can assembly for an engine exhaust aftertreatment canister comprises an end can formed from an end plate and a wall extending from a periphery of the end plate, the end plate and the wall having a first cutaway portion formed therein. A pipe is provided in the first cutaway portion and attached to the end can around the first cutaway portion to form a seal with the end can, the pipe having at least one opening provided therein which opens into an interior of the end can assembly. A bracket, comprising a plate and a shoulder extending at an angle from the plate, is attached to the end plate and to the wall, the shoulder having a second cutaway portion formed therein which is shaped to receive the pipe whereby the shoulder abuts the pipe and provides structural support to the pipe and end can.

Abstract: A structure is provided for installing a pipe fixing clamp installed in a sound absorber. A part of a curved pipe portion of an internal structural pipe of the sound absorber is cut to form an exhaust gas flow space. The pipe fixing clamp having multiple holes is connected to the exhaust gas flow space.

Abstract: A fluid regulating device includes a valve having an inlet and an outlet and an actuator coupled to the valve and having a control assembly. The control assembly includes a control element and a diaphragm operably connected to the control element, the control element disposed within the valve and adapted to be displaced relative to a valve seat. A noise attenuation assembly is coupled to the outlet of the valve and includes a cylindrical body and at least one plate disposed in the cylindrical body, the at least one plate having an outer edge. An apparatus for retaining the noise attenuation assembly includes a plurality of rods coupled to the at least one plate. The plurality of rods includes at least one rod having a first end disposed through the outer edge of the at least one plate to support the noise attenuation assembly.

Abstract: An example device includes a conveyor to convey a printed medium along a path from a print engine towards a printed media output. The device further includes a housing to hold the conveyor. The housing defines an air intake, an exhaust port, and a conveyor volume to contain the conveyor. The air intake provides air to the conveyor volume to dry the printed medium. The device further includes a tortuous exhaust passage extending from the conveyor volume to the exhaust port to exhaust air from the conveyor volume.

Abstract: An internal combustion engine, exhaust system, exhaust gas/reactant mixing assembly unit includes an inlet area (14) of an exhaust gas flow duct (12) and a reactant release device (20) releasing reactant (R) into exhaust gas (A) flowing in the exhaust gas flow duct. The exhaust gas flow duct includes a mixing section (16) with a first mixing section segment (22) downstream of the reactant release device (20). An exhaust gas/reactant mixture flows in the first mixing section segment essentially in a main flow direction (H1)—from the reactant release device to a deflection area. A ring-shaped second mixing section segment (28) surrounds the first mixing section segment. The exhaust gas/reactant mixture flows in the second mixing section segment (28) in a second main flow direction (H2), essentially opposite the first main flow direction, from the deflection area (26) to an outlet area (34) of the exhaust gas flow duct (12).

Abstract: The present invention relates to an exhaust gas dispersion device for an agricultural working vehicle, comprising: a dispersing body into which an exhaust gas discharged from an exhaust port of the agricultural working vehicle flows; a deceleration part coupled to the distributing body to reduce the speed of the exhaust gas flowing into the dispersing body; and a plurality of dispersing holes formed through the dispersing body at positions spaced apart from each other so that the exhaust gas decelerated by the deceleration part is dispersed and discharged out of the dispersing body.

Abstract: Systems are provided for an exhaust gas aftertreatment device, in particular in a motor vehicle, having a catalyst accommodated in a housing which, along its length, has a first end section, a catalyst section, and a connecting section. The housing further comprising a particulate filter located downstream of the catalyst.

Abstract: Two end caps with metal straight tubing inserted into a muffler canister, Then affixed to a motorcycle header pipes that's connected to a combustion engine, Particularly a motorcycle engine, Where exhaust gas discharges through both creating more engine performance and sound.

Abstract: An apparatus for attenuating sound waves in a gas turbine engine includes a surface at least partially defining a pathway for airflow and a plurality of fins extending from the surface. The plurality of fins are configured to dissipate heat into the airflow. Each fin of the plurality of fins includes a fin surface. The fin surface is configured to direct the sound waves between the plurality of fins such that the plurality of fins attenuate the sound waves. The plurality of fins are arranged such that spacing between adjacent fins of the plurality of fins facilitates sound attenuation.

Abstract: A resonator (1, 1?, 1?) for reducing airborne noise has at least one first ring-shaped chamber (2, 2?, 2?) arranged between an inlet piece (6, 6?) and an outlet piece (7, 7?). An inner tube (3) or inner tube pieces (4, 4?, 5) are arranged between the inlet piece (6, 6?) and outlet piece (7, 7?) and have wall apertures (18, 19, 28, 28?, 29, 29?, 30, 30?) as a connection to the adjacent ring-shaped chamber (2, 2?, 2?). The first ring-shaped chamber (2, 2?, 2?) is divided by at least one radially encircling dividing rib (13, 13?, 13?) into at least two sub-chambers (14, 14?, 14?, 15, 15?, 15?). The dividing rib (13, 13?, 13?) has a free end that, relative to the wall that is adjacent in a radial direction, forms an encircling annular space (16) for receiving an air layer that co-resonates in steady-state.

Abstract: A fluid mixer of the present invention has an element (1) and a chassis (2) that accommodates the element therein and that is engaged with at least both ends of the element, the element having: a first-flow-path forming section (13) at an end of which a fluid inlet (3) is formed and in which a first flow path (4) is formed; and a body section (12) at an end of which a fluid outlet (8) is formed, in which a second flow path (5) is formed, and on an outer circumferential surface of which a plurality of communicating holes (11) are formed so as to allow the second flow path to communicate with the outside.

Abstract: A noise suppression device for use with a firearm includes a body including an outermost external surface of the noise suppression device and an internal portion and a core seamlessly connected to the internal portion of the body, wherein the noise suppression includes no joints, no seams, or any formerly separate pieces within the body or the core, and the core includes a structure of a plurality of holes defined by a framework of a connecting structure that connects to the internal portion of the body. Optionally, the core can include one or more baffles or one or more chambers.

Abstract: A heat exchanger system for treatment of a flow of exhaust gases in an exhaust gas aftertreatment system of a vehicle. The heat exchanger system includes a nitrogen monoxide (NO) oxidation site for oxidizing nitrogen monoxide to nitrogen dioxide (NO2). The NO oxidation site is positioned such that the flow of exhaust gases at a downstream end (40) of the NO oxidation site in use of the heat exchanger system is arranged to proceed at a temperature within a predetermined temperature interval corresponding to a desired NO to NO2 (NO:NO2) ratio interval in the flow of exhaust gases. An exhaust gas aftertreatment system and a vehicle including such a heat exchanger system, and a method for using such a heat exchanger system, are also provided.

Abstract: An airborne noise reduction device includes a fixed-volume container having two opposing flat ends and two opposing symmetrical non-flat sides; an inlet port configured to face into a first room; an outlet port configured to face into a return air system; a diverter centrally mounted within an inside chamber to the two opposing flat ends of the fixed-volume container; and acoustic insulative material affixed to surfaces of the two opposing flat ends, the two opposing symmetrical non-flat sides, and the diverter within the inside chamber, wherein a combination of a geometry of the fixed-volume container and an absorption coefficient of the acoustic insulative material is configured to reduce an apparent sound index value of a sound source emanating from a second room connected to the return air system and received into the first room.

Abstract: A water separator for use in a marine exhaust system comprises a horizontally disposed, generally cylindrical housing including a wet exhaust inlet, a dry exhaust outlet, and a water outlet. Wet exhaust entering the wet exhaust inlet is constrained against the inner housing wall by a variable geometry vane or baffle which causes the wet exhaust to accelerate such that centrifugal force causes the entrained water to separate from the exhaust gas. Separated water encounters a longitudinally disposed barrier and flows to the water outlet for discharge from the vessel. A tubular dry exhaust pipe is longitudinally disposed within the housing and includes an inlet disposed in proximity to a first end thereof, and an outlet projecting from a second end thereof.

Abstract: Disclosed is a sound absorption plate with a unit structure. The sound absorption plate comprises an ultramicropore sound absorption front plate (1), a side plate (2) and a sound absorption back plate (3). Edge parts of the ultramicropore sound absorption front plate (1) are connected to the sound absorption back plate (3) through the side plate (2), thereby forming a sound absorption resonant cavity (4). The material of the ultramicropore sound absorption front plate (1) is a metal material carrying nano microspheres (5). A sound absorption metal thin film (6) carrying nano microspheres (5), parallel to the ultramicropore sound absorption front plate, is disposed inside the sound absorption resonant cavity (4). A pore size of the nano microspheres in the ultramicropore sound absorption front plate (1) and the sound absorption metal thin film (6) is 100-1000 nm.

Abstract: A sound suppressor for a firearm includes a plurality of segments attached end to end to form a container having an entrance orifice and an exit orifices defining a firing axis. Baffles are positioned in some of the segments. The baffles have a plate from which a truncated cone projects. The cone defines an opening aligned with the firing axis. The opening is offset from the geometric center of the plates.

Abstract: A noise suppression device for use with a firearm includes a body including an outermost external surface of the noise suppression device and an internal portion and a core seamlessly connected to the internal portion of the body, wherein the noise suppression includes no joints, no seams, or any formerly separate pieces within the body or the core, and the core includes a structure of a plurality of holes defined by a framework of a connecting structure that connects to the internal portion of the body. Optionally, the core can include one or more baffles or one or more chambers.

Abstract: A muffler assembly for a pneumatic power tool includes a tube member defining an interior volume. The tube member includes an upper segment and a lower segment. The upper segment defines a first diameter and includes a closed upper end to inhibit fluid communication with the interior volume therethrough, a lower end, a first portion defining a plurality of vents to enable fluid communication with the interior volume therethrough, and a second portion defining a continuous surface to inhibit fluid communication with the interior volume therethrough. The lower segment defines a second diameter greater than the first diameter and includes an upper end in fluid communication with the lower end of the upper segment, a lower end, a first portion defining a plurality of vents to enable fluid communication with the interior volume therethrough, and a second portion defining a continuous surface to inhibit fluid communication with the interior volume therethrough.

Abstract: A smoke evacuator and evacuation system for removing gaseous and/or particulate byproducts of surgical procedures and noxious vapors from chemicals is provided and includes an end effector or vacuum head positionable at a surgical site, the end effector including a plenum, a plenum support for preventing the plenum from collapsing, and an adaptor for coupling the end effector or vacuum head to a vacuum source.

Abstract: An exhaust structure for a straddle-type vehicle includes a muffler having an outer tube constituting an outer circumferential member of the muffler; first and second separators defining expansion chambers in the outer tube; a body end member arranged at the downstream end of the outer tube; and glass wool provided on the inner circumference of the outer tube. The muffler further includes a resonator chamber provided in the most downstream portion of the muffler. The resonator chamber is formed by the outer tube, the body end member and the second separator situated closest to the body end member. The surroundings of the resonator chamber are surrounded by the glass wool. Such exhaust structure of a straddle-type vehicle is capable of taking measures against exhaust heat and exhaust sound even with a configuration where there is only one, single resonator chamber.

Abstract: A monolithic noise suppression device comprising a monolithic, integral baffle housing module. The module comprising, in turn, at least no welded joints or seams between the various components that make up the core of the module and no welded joints or seams between the core, or any structures that make up the core, and the various interior surfaces and/or structures that make up the body of the module. The module is preferably plastic and manufactured using a layered printing process. The monolithic, integral baffle housing module may include various other features that enhance performance, reduce manufacturing cost, facilitate customization and eliminate restrictions on disposability as compared to conventional noise suppression devices. The monolithic noise suppression device may further comprise a first stage noise suppression device to be used in conjunction with the monolithic, integral baffle housing module.

Abstract: A muffler for an exhaust system can comprise a muffler body including an exterior metal shell having an outer surface and an inner surface, a portion of the inner surface defining a gas chamber, the gas chamber having a first side portion and a second side portion; a plurality of baffles, each baffle coupled to the inner surface, each baffle extending from an outer end to an inner end the inner end of each baffle having a reflecting portion bent in a direction of gas flow, wherein a first baffle of the plurality of baffles is coupled to the first side portion and a second baffle of the plurality of baffles is coupled to the second side portion; a flow channel formed between the bent end of the first baffle coupled to the first side portion and the second baffle coupled to the second side portion; and a first plate assembly, coupled to the inner surface.

Abstract: Noise attenuation apparatus for pressure regulators are disclosed. An example apparatus includes a first noise attenuator disposed at a first position in a fluid passageway of a pressure regulator and a second noise attenuator disposed at a second position in the fluid passageway. The second position is spaced apart from the first position along the fluid passageway. The example apparatus also includes fasteners extending between the first noise attenuator and the second noise attenuator to position the first noise attenuator at the first position and the second noise attenuator at the second position. The fasteners are to couple to peripheral portions of the noise attenuators.

Abstract: A monolithic noise suppression device comprising a monolithic, integral baffle housing module. The module comprising, in turn, at least no welded joints or seams between the various components that make up the core of the module and no welded joints or seams between the core, or any structures that make up the core, and the various interior surfaces and/or structures that make up the body of the module. The module is preferably plastic and manufactured using a layered printing process. The monolithic, integral baffle housing module may include various other features that enhance performance, reduce manufacturing cost, facilitate customization and eliminate restrictions on disposability as compared to conventional noise suppression devices. The monolithic noise suppression device may further comprise a first stage noise suppression device to be used in conjunction with the monolithic, integral baffle housing module.

Abstract: An after-treatment component for receiving an exhaust stream from an internal combustion engine comprises a vessel having a first end, a second end, and an intermediate section. The vessel defines an inlet port and an outlet port. The inlet port is in fluid communication with an inlet diffuser disposed within the vessel. The inlet diffuser is in fluid communication with the inlet port and with a diesel oxidation catalyst disposed within the vessel. The diesel oxidation catalyst is in fluid communication with the inlet diffuser and with a transfer duct. The transfer duct is in fluid communication with the diesel oxidation catalyst and with an intermediate diffuser disposed within the vessel. The intermediate diffuser is in fluid communication with the transfer duct and with a catalyzed filter disposed within the vessel. The catalyzed filter is in fluid communication with the intermediate diffuser and with the outlet port.

Abstract: The present invention relates to a silencer duct for a ship's propeller using resonant barrels, wherein the ship's propeller is surrounded by the silencer duct so as to deaden underwater noises of various frequencies generated by the propeller, the duct being made into a cylindrical form to surround the propeller arranged in the side or rear part of the ship so as to guide the fluid direction as the propeller rotates, and the inside of the duct being provided with a plurality of resonant barrels for damping resonant frequencies arranged in the form of n×m (herein, n and m are natural numbers except 0) so as to damp the sound waves generated by the rotation of the propeller.

Abstract: A diffuser plate for a vehicle exhaust system comprises a body having a primary opening and a plurality of secondary openings circumferentially spaced apart from each other about the primary opening. In one example, the diffuser plate is positioned between an exhaust manifold and a catalytic converter. Exhaust gas from the exhaust manifold flows through the primary and secondary openings in the diffuser plate to provide a thorough mixed flow that is evenly distributed across an inlet to a catalyst substrate, and also enable an oxygen sensor to accurately measure engine cylinder exhaust gas chemistry.

Abstract: An aeroengine exhaust cone is arranged to extend from upstream to downstream along a longitudinal axis. The cone comprises a structural core of composite material made up of an axisymmetric part having an upstream endpiece at its upstream end and a downstream endpiece at its downstream end. The core provides structural strength to the cone. The cone has an acoustic attenuation system made of composite material and fastened on the structural core.

Abstract: The invention relates to a device for arresting flames in a gas flow, for example in a kitchen hood, the device includes at least two substantially parallel spaced apart fire proof sheets, wherein the sheets are provided with perforated zones, wherein at least a channel is formed by a perforated zone of the sheet upstream of the gas flow, the space between the at least two sheets and a perforated zone of the sheet downstream of the gas flow, wherein the channel includes a section which has a reverse direction relative to the gas flow.

Abstract: Embodiments of a coil-equipped firearm suppressor are disclosed herein. According to various embodiments, the coil-equipped firearm suppressor can include a firearm suppressor housing. The firearm suppressor housing can include an outer surface, an inner cavity, and an attachment mechanism that attaches the firearm suppressor housing to a barrel of a firearm. The inner cavity can accommodate a baffle insert. The baffle insert can include one or more removable coils and/or rods that can enhance the suppression capabilities of the coil-equipped firearm suppressor.

Abstract: A sound suppressor for a firearm, such as a shotgun, may include a rear end cap, a plurality of baffle units and a front end cap that are configured to be assembled in an end-to-end arrangement. These elements may be secured to one another with one or more elongated coupling elements that extend through the end-to-end arrangement, along with one or more complementary securing elements. Such a sound suppressor may lack an outer housing. A plurality of guide rods may extend through an interior of such a sound suppressor in a manner that provides the framework for a passage for a projectile as it moves through the sound suppressor. A barrel coupling element that may be used with a sound suppressor is also disclosed, as are methods for tailoring the length of a sound suppressor and for customizing the types and arrangement of baffles used in the sound suppressor.

Abstract: Disclosed is a system and method for decreasing airflow and improving ventilation within a tunnel, such as a railroad tunnel, including a path for movement of a vehicle (e.g., train) therethrough. The system has a plurality of air baffles mounted within the tunnel, each device comprising a body and a mounting device. Each mounting device positions each body inside and along the length of the tunnel between the entrance and the exit. The air baffles are configured to restrict airflow at least in part in a longitudinal direction of the tunnel, thereby increasing a relative difference between a vehicle speed and air speed in a tunnel annulus when the vehicle passes through the tunnel. The restriction (e.g., decrease) of airflow in the tunnel reduces the piston effect resulting from the vehicle or train passing through, thus reducing emissions and heat generated by the locomotives in the tunnel.

Abstract: The structure for the reduction of noise occurring when a fluid flow passes over a surface is disclosed by the present application. The structure comprises a surface with a top face that is roughly parallel to the flow wherein the face has an array of multiple separate and discreet cavities inset into the surface. Each cavity may be tuned to mitigate the noise of a specific frequency of the flow by altering the size, shape, position, angle in relation to the flow and ratios of depth, width, and length of the cavity. The cavities may be divided by partitions into sub-cavities of differing sizes, shapes and positions to mitigate noise as well. The structures may be applied to any application where a flow exists over a surface including, but not limited to, aerospace, automotive, naval and electronics. The structure may be flat, curved, tubular or any other shape subject to fluid flow.

Abstract: A muffler for an exhaust system of an internal combustion engine having a housing wall, having a muffler housing with at least one inlet pipe guided through the housing wall and at least one outlet pipe guided through the housing wall, wherein the inlet pipe has at least one outflow opening via which the exhaust gas can flow from the inlet pipe into the outlet pipe, whereby, within the muffler housing, at least one coupling chamber with a chamber wall is provided with a centre axis, which forms a flow channel between the inlet pipe and the outlet, whereby the chamber wall encloses the inlet pipe or the outlet pipe in the receiving direction E1 with respect to the centre axis and is connected only indirectly via the inlet pipe and the outlet pipe or a muffler housing intermediate wall in a form- or material-fitting manner to the housing wall, whereby the chamber wall of the coupling chamber has a diameter D and whereby the exhaust pipe has an outer diameter d, whereby for the ratio of D/d, 20/10>?D/d>=11

Abstract: A baffle for use in a sound suppressor that is designed to minimize the sound that emanates from a fired firearm. The baffle generally includes a back section and a conical section. A bore extends through each of the sections and is sized for a fired projectile to pass through. The sides of one or both of the sections are configured to reduce the sound. Further, a second hole extends through the back section at the bore to allow for the passage of gases.

Abstract: A noise muffler is configured to substantially surround a sound generating object, disposed in or to be disposed in, a structure including a wall or ceiling to be sound limited by, and attenuate sound emitted from the sound generating object, the wall or ceiling including a board having an exposed surface and an opposite surface. The noise muffler has front, rear, left and right sides and a bottom. The sound generating object is positioned in the muffler cavity. The front, rear, left and right sides, and the bottom of the muffler are formed with an outer barrier layer. At least one of the front, rear, left, right sides and bottom of the muffler are formed with a noise absorbing layer positioned adjacent the outer barrier layer to absorb a predetermined amount of sound emitted from the object. At least one of the front, rear, left and right sides includes a first opening into the inner volume of the muffler cavity, the size of which first opening is adjustable.

Abstract: An acoustic isolation chamber. The chamber comprises a housing defining a volume. A first region of the volume is configured to receive a photoacoustic sensor head. A second region of the volume is configured to receive the UUT. A sound proofing means encompassing at least a portion of the volume.

Abstract: A housing with a first end wall and second end wall with a first baffle and second baffle spaced apart and positioned between end walls with a cover attached to form a first chamber, an intermediate chamber and a third chamber. An intake tube is inserted through the first end wall, first baffle and second baffle to terminate at an exit end in the third chamber. An exhaust tube is inserted through the second end wall, second baffle and first baffle to terminate at an intake end in the first chamber. The intake tube and exhaust tube each have openings in an intermediate tube wall. The exhaust tube has openings in a second tube wall portion. There is an intermediate port in the first baffle. A threaded shaft of a valve is threadably engaged in a fitting attached in the second end wall to be positioned opposed the exit end.

Abstract: An exhaust muffler disposed in proximity to a cylinder of a general-purpose engine is provided, in which an exhaust muffler for a general-purpose engine is formed from a muffler main body connected to a cylinder of a general-purpose engine via an exhaust pipe and disposed adjacent to the cylinder, a partition member that divides the interior of the muffler main body into a first muffler chamber communicating with the exhaust pipe and a second muffler chamber communicating with an exhaust outlet of the muffler main body, and an exhaust cooling pipe exposed outside the muffler main body while providing communication between the first muffler chamber and the second muffler chamber. This enables exhaust gas to be cooled effectively by passing though the exhaust cooling pipe when moving from the first muffler chamber to the second muffler chamber, thus enhancing muffling by reducing the pressure of the exhaust gas.

Abstract: An embodiment includes a transparent sash mounted integral to the perforated doors on racks which hold computer servers typically installed in data centers. The racks are arrayed in rows forming cold aisles and hot aisles. Cooled air introduced into the cold aisle flows through the racks and cools the servers, and subsequently is removed from the hot aisle. Embodiment sashes slide vertically and extend above the tops of the racks and form a sealing relationship with the data center ceiling and adjacent sashes, thereby preventing wasteful mixing and recirculation of cooled and heated air over the tops of the racks. Embodiments are raised and lowered manually or automatically. The controls for the movement of the sashes are tied to the building automation and fire alarm systems and the sashes are lowered automatically upon activation of the data center fire suppression system, thereby complying with code requirements and avoiding interference with the fire sprinkler and suppression systems.

Abstract: A baffle is provided that includes at least one carrier and a sealer disposed in a recess. When placed in a cavity, such as a vehicle cavity, sealer also expands into the cavity to seal the cavity. Baffle can be modified by including an insert within carrier to increase the weight, density, and structural rigidity of baffle, without altering the exterior dimensions of baffle. A baffle that includes an insert can be customized based on a particular application, without requiring time-consuming and expensive tooling changes.

Abstract: A low emissions 2-stroke natural gas fueled engine includes at least one cylinder with an exhaust port in communication with a silencer/catalytic converter unit. The unit has first and second volumes in communication with each other. The first volume dampens spurious exhaust pressure excursions and removes particulates in the exhaust. The second volume houses an oxidation catalyst for treating exhaust to reduce exhaust emissions. The engine oil has at most 10 ppm zinc content to reduce metal poisons contained in the exhaust prior to contact with the oxidation catalyst. The engine oil preferably has a very low ash content to minimize sulfur combustion components in the exhaust to reduce masking of the oxidation catalyst. The first volume preferably has a pressure relief valve set to relieve at a pressure greater than the maximum normal operating pressure of the engine to avoid excessive pressure excursions of the engine exhaust from damaging the oxidation catalyst.

Abstract: An exhaust muffler includes a pair of base members disposed substantially parallel to one another and defining an exhaust entry and exhaust exit. At least one wall member is coupled to the base members. The at least one wall member is intermediate the base members and intermediate the entry and exit. The at least one wall member includes a linear portion coupled to a semicircular portion.

Abstract: A gradient density padding material includes a single layer of nonwoven material having at least one surface processed to form a portion of a thickness thereof having a density increased with respect to a remaining portion of the thickness thereof. The single layer of nonwoven material after processing has an airflow resistance within the range of 200-4000 MKS Rayls, wherein said single layer of nonwoven material has an enhanced acoustic performance. A method of making a gradient density padding material having an enhanced acoustic performance includes the steps of providing a single layer of nonwoven material and processing at least one surface of the single layer of nonwoven material to form a portion of a thickness thereof having a density increased with respect to a remaining portion of the thickness thereof. The single layer of nonwoven material after processing has an airflow resistance within the range of 200-4000 MKS Rayls.

Abstract: An acoustic baffle device for sealing a cavity of a vehicle body at a predetermined cross section of the cavity is provided. The device has a carrier having an opening therein, a heat expandable sealing material affixed to the carrier, and a flap assembly having a flap normally held in place by a spring so as to close off the opening, wherein the flap is capable of being deflected by insertion of a tube through the opening.

Abstract: A muffler apparatus for a vehicle may include a muffler housing that has first and fourth chambers formed at front and rear portions therein and second and third chambers formed between the first and fourth chambers in sequence, an exhaust gas intake pipe that may be inserted in the muffler housing through the front portion of the muffler housing, with an end portion thereof being disposed in the third chamber, and exhaust gas discharge pipes that may be connected with the second chamber and discharge an exhaust gas to the outside of the muffler housing.

Abstract: A compressor muffler (100) for a refrigeration system is provided with an array of Helmholtz resonators (130, 230, 330) formed along an inner surface of a muffler chamber (110) of the muffler.

Abstract: An exhaust baffling assembly which allows for the operator of a motor vehicle to select between two or more modes varying between maximum noise control, and maximum performance. This device is easily installed in most motorcycle after-market exhaust systems by removing the supplied baffle, and mounting the presented device in the same mounting hole, making for a modification free installation. After this device is installed, the mode selections offered can be selected at the operators discretion by hand, and without tools.

Abstract: An insert for sealing and acoustic damping of a longitudinal cavity having an interior surface, comprising: a) one or more carrier plates made of a polymeric material (A) which does not deform when heated to a temperature not higher than 180° C. and which comprises a main polymer (A1) which gives mechanical strength to the carrier plate, and—at least one vibration-damping polymer (A2), and b) a thermally expandable material (B). The vibration-damping polymer (A2) is preferably selected from the group comprising: thermoplastic polyurethanes, styrene/butadiene block copolymers, hydrogenated styrene/butadiene block copolymers, styrene/isoprene block copolymers, hydrogenated styrene/isoprene block copolymers, styrene/isoprene/styrene tri-block copolymers, and hydrogenated styrene/isoprene/styrene tri-block copolymers.