Abstract: One or more systems for silencing and extracting waste heat from exhaust of a combustion system for performing an operation and using the waste heat to perform an additional operation are provided herein. The system can include a heat recovery silencer. An inner housing of the heat recovery silencer can be in fluid communication with a combustion system. A heat recovery flow path of the heat recovery silencer can have an outlet port in fluid communication with an auxiliary device inlet, and the heat recovery flow path can have an inlet in fluid communication with an axially device outlet of the auxiliary device.

Abstract: A silencer apparatus for attenuating noise in gas flow systems. The apparatus generally includes a housing having an interior cavity and a gas flow inlet and outlet that are adapted to be connected to a passage such that a gas flowing through the passage enters and exits the cavity of the housing through the inlet and outlet, respectively. A silencer cartridge unit is removably disposed within the interior cavity of the housing and defines a gas flow path fluidically connected to the inlet and outlet of the housing. The silencer cartridge unit has at least one sound-attenuating element that surrounds the gas flow path. The housing is further equipped with a closure that sealingly closes a portion of the housing, and is releasable from the housing to provide an access opening through which the silencer cartridge unit can be removed. The apparatus can also be adapted to include a filtration medium.

Abstract: A supplemental air pressure providing device adapted for use with an inflatable object includes an oscillator responsible for generating magnetic field and vibrating a casing, an air compressing device responsible for compressing air and noise silencer mounted inside the air compressing device for reducing noise generated while compressed air flows through the air compressing device for inflating the inflatable object.

Abstract: An intake sound adjusting device includes an intake passage, a tubular branch passage branched from the intake passage, and an oscillating member disposed within the branch passage, in which the oscillating member has an oscillating portion disposed so as to close an interior of the branch passage and a controlling portion extending from the oscillating portion in a direction along an extending direction of the branch passage.

Abstract: A compressor has first and second enmeshed rotors: rotating about first and second axes. The first rotor is supported by a bearing system carried by a bearing case. The bearing case has at least a first port to a discharge plenum. A first sound-absorbing material is positioned within the first port.

Abstract: Anti-noise device for an internal combustion engine (9) equipped with a turbocompressor (10) for supercharging includes a turbine (11) placed in the exhaust gas flow and driven by these gases with the turbocompressor (10) connected by a shaft (13) to a compressor (14) mounted in the air intake conduit (3) of the engine (9). The anti-noise device includes a hinged flap (4) mounted within the air intake conduit (3) of the engine (9), upstream from the compressor (14) and capable of closing this conduit (3) under the action of a gaseous reflux coming towards it.

Abstract: A hyperbaric oxygen therapy system includes a pressure vessel containing a gas, an oxygen concentration measurement apparatus for monitoring the concentration of oxygen in the gas, an environmental control apparatus for controlling the temperature of the gas in the vessel, and a pressure/ventilation control apparatus for controlling the pressure of the gas in the vessel. The pressure vessel is capable of accommodating a patient. The oxygen concentration measurement apparatus includes an oxygen concentration analyzer and a plurality of gas lines connecting the oxygen analyzer to the pressure vessel. The pressure/ventilation control apparatus includes a pressure controlling valve, a pressure sensor, a ventilation valve, and a controller having a programmable pressure profile. The environmental control apparatus includes a scrubber, a heat exchanger and a blower located within the pressure vessel. A compressor for the system includes a compressor silencer.

Abstract: The present invention discloses a suction muffler for a hermetic compressor which reduces noise of refrigerant. A plate film operating as a kind of flow resistance is provided on a refrigerant suction passage in various shapes and specific positions. Therefore, the suction muffler can effectively reduce pressure pulsation transferred to the outside and guarantee flow efficiency, although the refrigerant is directly sucked thereinto.

Abstract: A resonator for an air intake system of a motor vehicle has a housing and at least one resonator chamber enclosed by the housing. At least one air intake opening for fresh air is provided in the housing and opens into the resonator chamber. At least one air exhaust opening for fresh air is provided in the housing and opens into the resonator chamber. The at least one air exhaust opening is also an intake opening of an auxiliary device, especially an air compressor.

Abstract: A tuned acoustic attenuation device includes a housing defining a chamber within with air inlet and outlet channels opening into the chamber. An acoustic chamber or chambers are arranged on an exterior wall of or alternately within the housing and positioned to extend in a substantially lateral parallel relationship to the inlet or outlet channel and are configured as quarter wave tuners. The acoustic chambers may be realized within the housing by adapting housing stiffening support ribs of the housing. The acoustic attenuation characteristics of individual acoustic chambers cooperate to broaden the sound attenuation bandwidth or increase the attenuation at selected noise frequencies.

Abstract: An air induction sound modification system for an internal combustion engine includes a multi-frequency sound suppression unit having Helmholtz resonators and a multi-component expansion chamber. A sound generator, which functions to radiate sound at a desirable, tuned frequency, extends between the multi-function sound suppression unit and a second expansion chamber, such as an air cleaner box.

Abstract: A suction system for a refrigerator compressor includes a suction muffler with an outlet tube mounted to a valve plate and a cylinder head having a reinforced portion in the area of the valve plate and the outlet tube.

Abstract: An air inlet system for an internal combustion engine includes an air inlet duct for drawing charge air into a charge air processor, and an intake manifold system leading from the charge air processor to the power cylinders of the engine. A resonator which suppresses pressure pulses within the inlet duct is mounted to the intake manifold system, but fluidically connected to the air inlet duct, and not to the intake manifold system.

Abstract: A resonator attenuates sound waves at first and second frequencies. The resonator includes a first tube, and a second tube received within the first tube. Both tubes have an open end and a closed end. The first tube has an axial length which is longer than the axial length of the second tube. The first tube attenuates sound waves at the first frequency and the second tube attenuates sound waves at the second frequency. The second tube has an outer wall which engages an inner wall of the first tube. The open end of the second tube is surrounded by the open end of the first tube. The open end of the first tube is attached to an engine air intake conduit. The conduit communicates air from a charge air cooler to an engine intake manifold.

Abstract: An air intake system for reducing air induction noise, which includes an air duct housing that has a lower shell and an upper shell, each having a first end and a second end and a plurality of tuning holes formed therein. The air intake system further includes an air duct that is connected to the air duct housing and includes a circumferential wall having an interior surface and an exterior surface. The circumferential wall defines an aperture between a first end and a second end. A venturi is formed between the first and second ends and restricts the amount of sound passing from the first end to the second end of the air duct. The circumferential wall has a predetermined thickness that enables sound to pass through the circumferential wall and into the air duct housing.

Abstract: A noise and vibration reduction system for an engine affixed to a body and a method for reducing vibrations in the body produced by that engine during operation. The present invention is particularly related to noise and vibration reduction in auxiliary power units installed on long-haul trucks and similar types of transportation vehicles. The primary noise and vibration reduction components of the present invention include an air intake silencer, a vibration tuner, and an engine speed limiter.

Abstract: An intake system for an internal combustion engine has an intake silencer 30 provided with an expansion chamber 33, and a connecting pipe 40 having an inlet 46 through which air from the expansion chamber flows, and an outlet 47 through which air flows toward combustion chambers. The connecting pipe 40 is made of an elastic material having rubber elasticity, and has a connecting part 41 connected to the intake silencer 30, an inner tubular part 42 extending from the connecting part 41 into the expansion chamber 33 and having the inlet 46, and an outer tubular part 43 connecting to a throttle device 50. The wall 42w of the inner tubular part 42 is provided with a communication opening 44 for connecting the expansion chamber 33 and the air passage 45 to make the expansion chamber 33 serve also as a resonance chamber. The outer tubular part 43 of the connecting pipe 40 is shorter than the inner tubular part 42 of the same.

Abstract: A silencer apparatus for attenuating noise in gas flow systems. The apparatus generally includes a housing having an interior cavity and a gas flow inlet and outlet that are adapted to be connected to a passage such that a gas flowing through the passage enters and exits the cavity of the housing through the inlet and outlet, respectively. A silencer cartridge unit is removably disposed within the interior cavity of the housing and defines a gas flow path fluidically connected to the inlet and outlet of the housing. The silencer cartridge unit has at least one sound-attenuating element that surrounds the gas flow path. The housing is further equipped with a closure that sealingly closes a portion of the housing, and is releasable from the housing to provide an access opening through which the silencer cartridge unit can be removed. The apparatus can also be adapted to include a filtration medium.

Abstract: A system for reducing the emissions produced by an engine affixed to a body during operation and reducing noise and vibration. The present invention is particularly related to a small form factor active/passive Diesel Particulate Filter system having an exhaust backpressure sensor, a heating element, a Diesel Oxidation Catalyst, a power relay switch, a filter and an electronic control unit for controlling the heating element based on backpressure detected by the sensor.

Abstract: A device (1) for the feed of air to a compressor (2) of a gas turbine plant has an air inlet duct (8) and an air inlet chamber (9) which adjoins the air inlet duct. For the purpose of damping sound emissions of the compressor (2), a first and second inner wall (10, 11) of the inlet chamber (9) is at least partially lined by means of melamine foam. The invention is characterized by the advantages in that silencing is ensured both with wetness and with chemically aggressive conditions. The silencing device is consequently functionally reliable over an extended operating period.

Abstract: Disclosed herein is an air duct assembly for vehicles which reduces noise generated by the flow of intake air which flows along a path of the air duct provided in a vehicle and is fed to an engine. The air duct reduces the noise of a low frequency range in initial engine start operation, and in addition, the noise of a whole frequency range, thus allowing a vehicle to be traveled while providing the environment having minimum noise to a driver and passenger riding in the vehicle. Therefore, it is not necessary to install an additional resonator.

Abstract: A resonator for an induction system includes an inlet and outlet with a resonator cavity arranged therebetween. A tube is arranged within the resonator cavity and at least partially extends between the inlet and outlet. In one example, at least one supplemental noise attenuation device is in communication with the arcuate tube, such as a quarter wave tube and/or Helmholtz resonator. A large opening is provided in the tube that opens into the resonator cavity. In one example, the large opening is arranged on an outer radius side and faces a large cavity portion of the resonator cavity. Additional supplemental noise attenuation is provided by a collar arranged concentrically relative to the tube providing an annular quarter wave tube that is coaxial with the direction of flow from the outlet.

Abstract: An intake sound adjusting device includes an intake passage, a tubular branch passage branched from the intake passage, and an oscillating member disposed within the branch passage, in which the oscillating member has an oscillating portion disposed so as to close an interior of the branch passage and a controlling portion extending from the oscillating portion in a direction along an extending direction of the branch passage.

Abstract: A noise reduction system for a device having a noise generating subsystem includes a Helmholtz resonator and a controller. The Helmholtz resonator is disposed in fluid communication with the noise generating subsystem, and includes an active material responsive to a control signal that adjusts a dimensional characteristic of the Helmholtz resonator in such a manner as to affect a resonance characteristic of the Helmholtz resonator. The controller is responsive to an operational characteristic of either the device or the noise generating subsystem to produce the control signal. In response to the operational characteristic, the control signal serves to affect the resonance characteristic of the Helmholtz resonator in such a manner as to reduce a noise arising from the noise generating subsystem, or create a desirable sound quality alteration.

Abstract: An apparatus comprising includes a conduit portion having a conduit inner surface and a conduit outer surface, and a plurality of chambers in fluid communication with the conduit portion. The chambers include a first chamber defined, at least in part, by a first outer housing and a first chamber volume. The first chamber is in fluid communication with the conduit portion. A fluid is permitted to flow between the conduit portion and the first chamber through a first flow area. The chambers also include a second chamber defined, at least in part, by a second outer housing and a second chamber volume. The second chamber is in fluid communication with the conduit portion. A fluid is permitted to flow between the conduit portion and the second chamber through a second flow area. The first chamber volume is generally equal to the second chamber volume and the first flow area is greater than the second flow area.

Abstract: A filter assembly for use with compressor assemblies such as oxygen concentrators, ventilators and other breathing apparatus including a compartmented housing member having at least one inlet opening, an outlet opening, a filter member, and an adjustment member associated with the at least one outlet opening for varying the size of the at least one outlet opening for adjusting the amount of ambient air entering the filter assembly.

Abstract: A suction silencer in a compressor is disclosed, including a lower shell having an opened top, that draws refrigerant, and an upper shell fixed to the top of the lower shell to form an inside space that reduces noise of drawn refrigerant, and that discharges refrigerant in a direction different from a flow direction of the refrigerant introduced into the lower shell, thereby simplifying a structure to permit easy assembly.

Abstract: An air induction housing having a perforated wall which simultaneously provides ample air entry into the air induction housing and excellent intake noise attenuation. The size, number and arrangement of the perforations is selected such that ample airflow is provided and audibility of intake noise is minimized, based upon simultaneous optimization of: providing a plurality of perforations which collectively have an opening size that accommodates all anticipated airflow requirements; sizing each of the perforations such that the airflow demand involves an airflow speed through each perforation that is below a predetermined threshold at which perforation airflow noise is generated; and arranging the perforation distribution in cooperation with configuring of the air induction housing to provide a highest level of intake noise attenuation.

Abstract: A component, such as an intake manifold or a throttle body, has an air passage. A structure may extend into the air passage so that the structure intersects a part of a total air-flow passing through the air passage. The structure may have a first through-hole and a second through-hole. Each of the through-holes define a cross-sectional area that may tapers in a direction of air-flow that is passing through the air passage so that a cross-sectional area of an entrance of the respective through-hole is greater than a cross-sectional area of an exit of the respective through-hole. The structure helps attenuate acoustic noise that may occur in the component due to the air-flow.

Abstract: A rotatable sound attenuation device is provided comprising a central portion rotatable about a first axis, a radial portion extending outwardly from the central portion and a chamber having a closed first end and a second end opening radially outwardly of the radial portion and defining a second axis therein having a radial component thereto. A piston is disposed within the chamber and is moveable to a location along the second axis in response to a centrifugal force imparted on the piston by rotation of the central portion and the radial portion about the first axis. A biasing member operates to limit movement of the piston along the second axis. A quarter wave chamber is defined by the second, open end of the chamber and the piston and has a sound attenuating length defined by the location of the piston along the second axis of the chamber.

Abstract: A component, such as an intake manifold or a throttle body, has an air passage. A structure may extend into the air passage so that the structure intersects a part of a total air-flow passing through the air passage. The structure may have a first through-hole and a second through-hole. Each of the through-holes define a cross-sectional area that may tapers in a direction of air-flow that is passing through the air passage so that a cross-sectional area of an entrance of the respective through-hole is greater than a cross-sectional area of an exit of the respective through-hole. The structure helps attenuate acoustic noise that may occur in the component due to the air-flow.

Abstract: A component, such as an intake manifold or a throttle body, has an air passage. A structure may extend into the air passage so that the structure intersects a part of a total air-flow passing through the air passage. The structure may have a first through-hole and a second through-hole. Each of the through-holes define a cross-sectional area that may taper in a direction of air-flow that is passing through the air passage so that a cross-sectional area of an entrance of the respective through-hole is greater than a cross-sectional area of an exit of the respective through-hole. The structure helps attenuate acoustic noise that may occur in the component due to the air-flow.

Abstract: An air induction housing having a perforated wall which provides a first intake noise attenuation modality and further having a sound attenuation chamber interfaced with the perforated wall which provides a second intake noise attenuation modality. Multiply apertured tubes of the sound attenuation chamber provide a Helmholtz resonator, wherein the tubes are superposed the wall perforations so that, attendant to the noise attenuation, ample air entry into the air induction housing is provided. The size, number and arrangement of the perforations is selected such that ample airflow is provided and audibility of intake noise is minimized in conjunction with the corresponding tubes of the sound attenuation chamber.

Abstract: A suction muffler receives low-temperature refrigerant gas discharged into a hermetic container from a suction pipe by a gas catcher, and feeds the gas to a compressor. The lower end of an opening of the gas catcher is located at a position lower than the lower end of an orifice of the suction pipe so as to catch the refrigerant gas falling obliquely downward inside the hermetic container.

Abstract: 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 noises, which duct forms an induction system through which an incoming wind can be introduced towards a motorcycle combustion engine, and a holder disposed inwardly of the acoustic material for securing the acoustic material to the ram air intake duct.

Abstract: An exhaust system for a motorcycle provides enhanced steering stability and improved function for purifying exhaust gas. Front exhaust pipes connected with front cylinders of a V-type engine are joined to a front part of an exhaust chamber. Rear exhaust pipes connected with rear cylinders of the engine are joined to an upper part of the exhaust chamber. Exhaust gases discharged from both the front and rear exhaust pipes are unified within the exhaust chamber, and a catalyst is disposed in the vicinity of the unifying section. The length of the rear exhaust pipes is shorter than the length of the front exhaust pipes. High-temperature exhaust gas is introduced to the catalyst contained within the exhaust chamber via the rear exhaust pipes.

Abstract: An air induction silencer assembly includes an acoustic interference member disposed within a conduit. The acoustic interference member is tuned to acoustically cancel a selected noise energy frequency. An acoustic absorbing member is also disposed within the conduit. The acoustic absorbing member converts noise energy within the conduit into heat energy to attenuate noise energy within the air induction silencer assembly. The air induction silencer assembly connects to a flexible conduit that includes an inlet portion, an outlet portion, and a flexible joint that connects the inlet portion and the outlet portion together. The flexible joint includes a rolling lobe and a rolling surface. The rolling lobe moves along the rolling surface when the inlet portion moves relative to the outlet portion.

Abstract: An object of the present invention is to provide a duct having a simple structure and capable of suppressing occurrences of an intake noise and a dropping-out of an adsorbent, and to a process for producing the same capable of producing easily. The present duct (1) is one comprising a duct body (2) in tubular, and the duct body (2) is comprised of a nonwoven fabric in which an adsorbent (3) in at least one type among granular, powdery and fibrous is disposed as an intermediate layer. The duct body (2) is preferably composed of a first fiber layer (7) located on an inner circumferential side, a second fiber layer (8) located on an outer circumferential side, and the adsorbent (10) is disposed between the first fiber layer (7) and the second fiber layer (8).

Abstract: To provide an intake system of a motorcycle, which is capable of attenuating intake noise efficiently, and facilitating arrangement of resonators. An air cleaner includes an air cleaner case having an element and an expansion chamber with an intake passage connected thereto. Intake ducts introduce outside air into the air cleaner case. Resonators are provided on the expansion chamber and intake ducts, respectively.

Abstract: A system for separating contaminants from an air stream entering a sealed case through a vent fitting communicating to the interior cavity of the case includes a contaminant separator having a housing enclosing a chamber, an inlet and outlet communicating with the chamber, a baffle located in the chamber and producing a constricted fluid flow passageway between the inlet and the outlet.

Abstract: A tuning device may include a tubular portion having a hollow cross section and a flat body portion covering an engine. The body portion may have a chamber disposed therein and a throat providing fluid communication between the chamber and the tubular portion. Air flowing through the tubular portion causes the chamber to produce interfering sound waves having a predetermined frequency. The interfering sound waves manipulate sound waves produced by the engine.

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: A linear compressor unit including a reciprocating magnet driven by an electromagnetic alternating field. The magnet drives a piston reciprocatingly in a cylinder in a module casing, which casing also encloses a buffer volume. The cylinder is mounted in the casing so that it can oscillate. The cylinder includes an inlet opening coupled to an inlet passage in the module casing lying opposite to one another but without making contact with each other and forming a passage to the buffer volume. At least one restrictor element is located in the passage to dampen sound of the unit.

Abstract: An air-intake device having a noise reduction mechanism includes a surge tank connected to an intake manifold for introducing intake air into an internal combustion engine, an air duct connected to an upstream end of the surge tank and a resonator connected to the surge tank and the air duct. The resonator forms a resonator chamber connected to both the surge tank and the air duct. The surge tank is separated from the resonator chamber by a first vibrating member, and the air duct is separated from the resonator chamber by a second vibrating member. The noises in the surge tank are offset or reduced by resonating vibrations of the first vibrating member, and the noises in the air duct are offset or reduced by resonating vibrations of the second vibrating member. Thus, the intake air noises are effectively reduced by a simple combination of the resonator and the vibrating members.

Abstract: An engine cover 17 has a cover main body 19 and an engine hood 20 which is attached to an opening portion formed on an upper surface of the cover main body 19 and a plurality of reinforcing plates 24 are fixed to an inner surface of the engine hood 20. First to fourth reinforcing plates 24a to 24d of a plurality of reinforcing plates 24 define a space in an engine portion 14. An expansion chamber 26 which is communicated with an intake passage 23 reaching to an engine and resonant chambers 27, 28 which are communicated with the expansion chamber 26 via ports 29 are formed in the engine portion 14.

Abstract: An internal combustion engine intake duct device is provided with an intake duct body and an air flow directing structure. The intake duct body has an inlet, a left outlet and a right outlet with an intake air passage formed in the intake duct body for supplying intake air from the inlet to left and right outlets. The inlet is disposed on an opposite side of the intake duct body from the left and right outlets and laterally between the left and right outlets in a top plan view. The air flow directing structure is arranged in the intake duct body to direct a flow of intake air entering from the inlet toward the left and right outlets. The air flow directing structure includes a first sound reflecting part serving to block sound from the left intake pipe and a second sound reflecting part serving to block sound from the right intake pipe.

Abstract: A multicylinder internal combustion engine E has a cylinder head 2; a cylinder head cover 3; an intake manifold 20 having a header body 21 disposed right above an engine body and intake runners 22; and a resonator 50. Each of the intake runners 22 has a bend 24 extending away from cylinder axes L in a longitudinal direction A2 perpendicular to the cylinder axes L, and curving so as to extend reversely toward the cylinder axes L. The resonator 50 is disposed opposite to the engine body with respect to the intake manifold 20 and is nearer to the cylinder axes L than outermost end parts 24a of the bends 24. The engine including the in take manifold and the resonator can be formed in a small dimension with respect to a longitudinal direction perpendicular to the cylinder axes, and the resonance chamber of the resonator can be easily formed to have a necessary volume.

Abstract: A pulsation dampener for receiving a fluid medium containing pressure pulsations. The pulsation dampener can include a body having an inner surface, an inlet, and an outlet, and a fluid path defined at least partially by the inner surface of the body. The fluid path can include a first chamber in fluid communication with the inlet and having a first cross-sectional area, a second chamber positioned adjacent the first chamber and having a second cross-sectional area different from the first cross-sectional area, and a third chamber in fluid communication with the outlet and positioned adjacent the second chamber opposite the first chamber and having a third cross-sectional area different from the second cross-sectional area. The fluid path can be configured such that the second cross-sectional area is greater than the first cross-sectional area and the third cross-sectional area.

Abstract: A vehicle resonator structure and attachment method is provided and includes a resonator chamber that has a first intake tube and a first exhaust or outlet tube attached thereto. At least one of the tubes includes a projection that can be molded (e.g., via flash molding after the tube itself is blow molded) onto the tube. The resonator chamber can include upper and lower tube mount structures that can be hot plate welded and sandwiched onto the projection in the tube. Thus, the tube(s) is/are positively retained in position with respect to the resonator chamber such that the tuning of the resonator does not change due to fluctuations in geometry of the tube(s) and resonator chamber structure, and such that there is little or no vibration noise and/or possible damage that might result if the tube(s) were free to move with respect to the resonator chamber.

Abstract: An intake system for an internal combustion engine has an intake conduit of thermoplastic material provided with an intake socket having an annular collar. At least one acoustic element is concentrically connected to the intake socket of the intake conduit, wherein the acoustic element is insertable into the annular collar. A closure surrounds the annular collar wherein the closure is a metal clamp having a metal strap and a metal clip. The metal clip effects a releasable clamping action with a variable diameter of the metal clamp.