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 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: An amplification device for amplifying suction noise of a vehicle is disclosed herein. An embodiment of the amplification device comprises an intake duct, a connecting pipe, an elastic membrane member and a contact member. The intake duct feeds air into an engine inlet port. A connecting pipe is connected to an interior of the intake duct. The elastic membrane member blocks a passageway inside of the contacting pipe. The contact member is connected to the connecting pipe and includes at least one portion that is adapted to selectively contact a surface of the elastic membrane member that faces the intake duct.

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 assembly operable to communicate intake air to an internal combustion engine is provided. The intake assembly includes an inlet adapter defining a flow conduit through which the intake air may pass and an intake manifold. The inlet adapter is removably mounted with respect to the intake manifold. At least one resonance chamber is defined by at least one of the inlet adapter and the intake manifold. A gasket member is operable to substantially seal the inlet adapter with respect to the intake manifold. The gasket member defines at least one tuner neck operable to provide communication between the at least one resonance chamber and the flow conduit to form at least one Helmholtz resonator.

Abstract: The present invention provides an air intake noise reducing device, an internal combustion engine fitted with the air intake noise reducing device and a structure for fitting the air intake noise reducing device to the internal combustion engine. The air intake noise reducing device comprises a gasket (2) comprising a ring member (2a) held by connecting surfaces of an air intake passage (100) and protrusion holding portions (2b) extending from the ring member (2a) toward a center of the air intake passage (100); and a net member (3) comprising a net (3a) for rectifying intake air and connecting protrusions (3b) extending outward from the net (3). The connecting protrusions (3b) are held in the protruding holding portions (2b) such that the ring member (3) is firmly secured to the gasket (3). The air intake noise reducing device constituted by in the above-mentioned manner can reduce assembly man-hours without deteriorating a sealing property of the air passage.

Abstract: A device for sucking in and compressing at least one gas in a fuel cell system has a compressor for the gas connected, at its gas inlet, to a gas filter system via an elastic, sealed gas-routing passage made from textile material.

Abstract: An apparatus for sonic coupling between an intake tract or engine compartment and a vehicle interior of a motor vehicle has a housing into which sound enters from the intake tract via a first line, and out of which sound exits into the vehicle interior via a second line. A transmission body is arranged in the housing, the transmission body having a gas-tight separating wall between a sound inlet into the housing and a sound outlet out of the housing. The position of the separating wall is held essentially constant by a positioning device. A transmission wall between the separating wall and the housing provides an acoutis transfer function that is adjustable. The separating wall runs generally perpendicular to the longitudinal axis of sound propagation and the transmission wall runs at an angle ? to the longitudinal axis of sound propagation.

Abstract: An air induction system for a vehicle is disclosed, wherein the air induction system includes a resonator bypass valve for control of an air flow to an engine and engine induction noise levels emitted therefrom.

Abstract: Disclosed is a reciprocating compressor having an assembly structure of a suction muffler, in which a supporting unit is formed on an inner circumferential surface of a resonant container of the suction muffler and a baffle is assembled in the resonant container by the supporting unit. By forming protrusions in the resonant container and inserting a baffle between the protrusions, the suction muffler can be easily and simply assembled. Accordingly, production costs can not only be reduced but also an increased noise reduction effect is obtained by precisely regulating an assembly position.

Abstract: An end cap for a fuel injector of a turbine engine is disclosed. The end cap includes an annular first surface including a plurality of perforations. The annular first surface is exposed to a combustion chamber of the turbine engine. The end cap is coupled to an end face of the fuel injector to define an enclosed cavity. The enclosed cavity and the plurality of perforations form an array of Helmholtz resonators.

Abstract: A silencer for attenuating a sound includes an inner duct in which gas flows, and an outer duct surrounding the inner duct with a gas layer formed between the outer duct and the inner duct. The sound is generated in one of an upstream side of the inner duct in a gas flow direction, a downstream side of the inner duct in the flow direction, and an inside of the inner duct. The inner duct includes a thin film over its entire surface. The film has a first reinforcement section formed in a direction parallel to the flow direction, and a plurality of vibrating surfaces. The film is bent at the first reinforcement section. Each combination of adjacent two of the plurality of vibrating surfaces is connected by the first reinforcement section. The first reinforcement section of the inner duct is fixed to the outer duct.

Abstract: An air suction device is provided with an air suction system having at least one capacity-enlarged portion, a compression pump compressing air in synchronization with operation of an engine, a compression air control unit, and a vibration plate which is vibration-excited by air compressed by the compression pump and disposed in a connection passage connecting a discharge side of the compression pump with the capacity-enlarged portion. The compression air control unit controls the phase and amplitude of a pressure variation of compression air discharged from the compression pump, to provide compression air with the pressure variation having the phase opposite to a pressure variation of suction air sucked into the engine.

Abstract: A compressor has first (26) and second (28; 30) enmeshed rotors rotating about first (500) and second (502; 504) axes to pump refrigerant to a discharge plenum (42). The compressor includes a muffler system (200) comprising a sound absorbing first element (232) and a sound absorbing second element (236). The second element at least partially surrounds the first element and defines a generally annular flow path portion (230) between the first element and the second element. A wall (250) at least partially surrounds the second element. A space (259) optionally containing a sound absorbing third element (261) surrounds the wall.

Abstract: The present invention relates to a compressor. In one aspect of the present invention, a compressor is provided, including a cylinder having a compression chamber, a valve assembly mounted on one open end of the cylinder, and a head assembly on the valve assembly. The head assembly includes a suction muffler, a head plate, a head cover, a damping pipe, and a discharge muffler. The suction muffler includes at least one wing on an outside surface of an outlet part thereof, and the head plate includes a first cut away part for inserting the wing of the outlet part. The head cover is closed fastened to the head plate so as to press down the suction muffler. In the meantime, the head plate includes a recess for inserting the middle part of the damping pipe therein to hold the damping pipe, and the discharge muffler is fitted to one surface of the head plate to surround the damping pipe.

Abstract: A compact noise silencer for a blower, including an L-shaped back wall having a sound adsorbent media and side walls defining a triangular enclosure, an inlet opposite one portion of the back wall and a central outlet opposite the back wall having a filter directing air into a blower. In the disclosed application, the blower directs air into a burner which heats the air for various applications.

Abstract: A pipe is incorporated in an intake system and has a first hole for a noise in the intake system to be released therethrough. A cover covers the pipe for attenuating the noise and has a second hole coinciding with the first hole circumferentially of the pipe.

Abstract: A pipe is incorporated in an intake system and having a first hole for a noise in the intake system to be released therethrough. A cover covers the pipe for attenuating the noise, having a second hole.

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: In a helicopter gas turbine engine, lips (30, 32) defining a radial air intake (34) are connected along an opening (12a) of an engine compressor air supply passage (12). The air intake lips are at least partially formed by a sound attenuator (40, 42) calculated to attenuate sound frequencies produced by the compressor rotation.

Abstract: The invention relates to a helicopter gas turbine engine having a combustion chamber, at least one turbine (20) arranged downstream from the combustion chamber to receive combustion gases emitted by the latter and a nozzle. The nozzle has one part forming a diffuser (26), connected downstream from the turbine and an ejector (30) which has an upstream part surrounding the downstream end of the diffuser and defining therewith an outlet passage (32) for an engine compartment cooling air secondary flow, the ejector running in the downstream direction beyond the downstream end of the diffuser. The ejector (30) has a wall formed at least partially by a sound attenuator (34) calculated to attenuate sound frequencies generated by the rotation of the or each turbine and/or by the combustion chamber.

Abstract: An air intake device includes an inner pipe member having a substantially cylindrical shape and defining therein an air intake passage by a wall portion of the inner pipe member, and an outer pipe member which surrounds a periphery side of the inner pipe member to define therebetween a space. The air intake passage communicates a surge tank with an atmosphere intake port through which air is introduced into the surge tank. The wall portion of the inner pipe member has at least one sound transmission portion through which sound is more readily transferred than other portions of the wall portion. The space has one end which is opening and positioned at a side of the atmosphere intake port, and the other end which is closed and positioned at a side of the surge tank.

Abstract: An intake assembly operable to communicate intake air to an internal combustion engine is provided. The intake assembly includes an inlet adapter defining a flow conduit through which the intake air may pass and an intake manifold. The inlet adapter is removably mounted with respect to the intake manifold. At least one resonance chamber is defined by at least one of the inlet adapter and the intake manifold. A gasket member is operable to substantially seal the inlet adapter with respect to the intake manifold. The gasket member defines at least one tuner neck operable to provide communication between the at least one resonance chamber and the flow conduit to form at least one Helmholtz resonator.

Abstract: An air induction system for carrying air to the intake of an internal combustion engine includes an air cleaner housing including a surface at least partially enclosing a first chamber or cover located in the air cleaner housing, an inlet through which air enters the air cleaner, and a MAFS bore through which air exits the air cleaner and passes to the engine intake, a second housing secured to the outer surface, the second housing and outer surface enclosing a second chamber, the second housing including a first port which comprise a sound attenuation device or devices.

Abstract: In a hermetic compressor in a freezing refrigerating system or an air-conditioning system such as a refrigerator or a showcase, a construction is disclosed for intending to provide a low-noise hermetic compressor by effectively attenuating a pressure pulsation having occurred in a compression chamber with a suction muffler. By this construction, since a muffler cover 20 has a planar simple shape, the deformation upon molding becomes little and it can come into fully close contact with a muffler main body 19. Therefore, the pressure pulsation hardly leaks through the connecting portion between the muffler main body 19 and the muffler cover 20. The full silencing effect that the suction muffler 18 has is obtained and thereby noise can be reduced more effectively.

Abstract: An exhaust gas muffler is provided for an internal combustion engine, especially for an internal combustion engine in a manually-guided implement such as a power saw, a cut-off machine, or the like. The muffler has a housing having an inlet for exhaust gases and an outlet out of the housing. To achieve an after burning of exhaust gas in a straightforward manner, the exhaust gases in the housing flow through a reaction zone in which the exhaust gases circulate at least partially.

Abstract: An air-intake apparatus includes an inner pipe member and an outer pipe member. The inner pipe member defines an intake passage that connects an inlet and a surge tank. Air is drawn into the inlet. A diameter of the inner pipe member gradually increases when the inner pipe member extends toward a surge tank-side end portion of the inner pipe member. The outer pipe member covers an outer circumferential side of the inner pipe member and defines a resonator between the outer pipe member and the inner pipe member. The resonator communicates with the intake passage.

Abstract: The invention concerns a suction muffler for a hermetic refrigerant compressor with a housing having an inlet and an outlet and limiting at least one muffling chamber, and a gas supply channel located in the muffling chamber between the inlet and the outlet. It is endeavoured to prevent too much oil from remaining in the refrigerant gas flow. For this purpose, the gas supply channel forms a throttling path and ends in the muffling chamber, and that in the area of the inlet of the gas supply channel an oil extraction opening is located, which ends in the muffling chamber.

Abstract: A suction gas guide system (100) for reciprocating compressor (30) comprises a gas guide conduit having both ends installed on a suction pipe (SP) of a shell (10) and on an inner flowing passage of a piston (31) so as to face each other and guiding sucked gas inside the shell (10) to the inner flowing passage of the piston (31), whereby a refrigerant gas is sucked into the gas flowing passage of the piston (31) through the gas guide conduit (100) smoothly. Accordingly, suction rate of the refrigerant gas is increased, moreover, noise and vibration generated during suction of the refrigerant gas are reduced, and therefore flow resistance for the noise and the sucked gas is reduced, whereby the reliability and efficiency of the compressor is increased. Also, the pre-heating of the gas by the motor (20) is prevented, and then increase of the specific volume of the gas is prevented, and thereby the efficiency of the compressor (30) is increased.

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: An air cleaner chamber is configured such that a filtering member is held between an air cleaner cover and an air cleaner case. A low-speed operation air intake passage and a high-speed operation air intake passage share an outlet passage portion near a dusty space, and are molded integrally on the air cleaner case using a synthetic resin. A passage switching valve is disposed so as to switch an aperture area of the high-speed operation air intake passage. In addition, a valve actuator for driving the passage switching valve is mounted to the air cleaner case.

Abstract: A fluid guideline with at least two structural elements made of substantially soundproof material has at least one opening for sound damping. An impedance change (in particular in the form of an impedance discontinuity) of the flow resistance of the fluid flowing through the fluid guideline is present between two adjacent structural elements, and the at least one opening is arranged in the region of the impedance change between two adjacent structural elements.

Abstract: This invention relates to a hermetic compressor used on a refrigerant cycle such as a refrigerator, and discloses a low noise compressor designed to attenuate a resonance sound in a compression chamber and intake pressure pulsing more operatively at a position adjacent to their sources, which intake pressure pulsing occurs at an intake valve port. In the compressor, a resonance space 38 is provided adjacent to the intake valve port 29 that is closer in distance to a noise source. As a result, noise can be reduced more operatively than muffling functions of an intake muffler 31 do. In addition, although acoustic characteristics of the intake muffler 31 amplify noises having specific frequencies, such noises can be attenuated before being amplified.

Abstract: A modular air induction system for a vehicle is provided. The air induction system includes a housing, a partition, and a plurality of holding members. The housing defines a chamber and includes an opening in fluid communication with the chamber. A partition is located within the housing to separate the chamber into a first and second volume thereby changing attenuation characteristics of the chamber. The partition is fixed within the chamber by at least one first holding member, thereby defining a first partition location. In addition, at least one second holding member is located within the housing and is adapted to receive the partition, thereby defining a second partition location.

Abstract: An air induction system for a motor vehicle, having a pair of conduits fluidly connecting an engine to the ambient air and a housing located between the pair of conduits. The housing includes side walls and a top wall defining a chamber. A baffle plate for attenuating noise is positioned within the chamber adjacent to the top wall. Additionally, the baffle plate defines a plurality of openings extending therethrough.

Abstract: A multi-spectral shield and associated inlet structure is provided for reducing the signature of an air inlet port defined within an exterior wall of an aircraft, ship, or land-based vehicle across radar and infrared wavelengths. The multi-spectral inlet shield includes a plate disposed in front of the air inlet port. The plate is sized to visibly eclipse the air inlet port, when viewed from a direction perpendicular to the plate. The plate is supported in this position by a plate mount or splitter that extends from within the air inlet port and attaches to the plate. A support may optionally combine with the splitter to support the plate in this position. Air passes behind the plate and into the air inlet port via a channel defined around at least a portion of the plate.

Abstract: In an air intake system, a rear tower having an interior space is provided on the top surface of a body frame. A rear pillar having an interior passageway is mounted on the rear tower. An air intake port communicating with the passageway is provided in the rear pillar, and the passageway and the space within the rear tower are connected together. An expansion silencer is connected to the space of the rear tower and an air cleaner is connected to the expansion silencer. The top surface of a working oil tank is lower than the upper end of a side plate to form a space above the top surface, where the expansion silencer is provided. A base bracket is mounted to the air cleaner, a support bracket is mounted on the side plate, and the base bracket is mounted on the support bracket to support the air cleaner above the expansion silencer.

Abstract: This invention relates to an automotive air filter assembly, in particular, an assembly which includes an air flow chamber portion and a liquid reservoir portion. The air flow portion includes a panel filter for filtering air flowing to an engine. The panel filter includes air filtration media and hydrocarbon absorption media to inhibit release of hydrocarbon vapours to the air on engine shut down. The air flow portion also may include resonance chambers for acoustic silencing purposes. The liquid reservoir portion can include a pump for delivery of fluid such as windshield washer fluid.

Abstract: A suction muffler for a reciprocating hermetic compressor, comprising a hollow body (10) provided with a gas inlet and a gas outlet (12, 14), which are respectively in fluid communication with the gas supply to the compressor and with a suction side thereof, said hollow body (10) defining a plurality of chambers comprising an innermost first acoustic chamber (50) in fluid communication with the gas outlet (14) of the hollow body (10), and a second acoustic chamber (51) surrounding at least partially the first acoustic chamber (50) and in fluid communication with at least one of the parts defined by said first acoustic chamber (50) and by the gas inlet (12) of the hollow body (10).

Abstract: A filter assembly configured for acoustic dampening for use with compressor assemblies such as oxygen concentrators including a compartmented housing member having an inlet opening, an outlet opening, a filter member, and a plurality of noise attenuating members positioned and located therewithin. The configuration of the compartmented housing member in conjunction with the positioning and location of the filter member and the noise attenuating members therewithin all contribute to absorb and dissipate any sound waves generated within the housing member due to air flow movement therethrough. This substantially reduces and minimizes noise associated with the present filter assembly.

Abstract: An air induction system for inducting air into an engine of an automobile is disclosed. The air induction system has an air cleaner and an air inlet tube. The air cleaner is in fluid communication with the engine of the automobile for filtering intake air inducted into the engine. The air inlet tube is made of a first material and is connected at a first end to the air cleaner and open to ambient air at a second end. The inlet tube has a flexible portion that flexes as a result of internal pressure pulsations during the air induction event. The flexing reduces or eliminates acoustic standing waves that have significant pressure fluctuations at the same location in the air induction system as the flexible portion.

Abstract: A system that enables enhanced air flow to the air intake of an internal combustion engine having a turbocharger is disclosed. The air induction system includes a plenum or expansion chamber located within the area directly in front of the inlet of the turbocharger. Alternatively, the air induction system may include a diffuser and/or an expansion chamber for reducing the velocity of the air flow within the clean air duct in an area directly in front of the inlet of the turbocharger.

Abstract: A resonator comprises a housing arranged in an intake member for defining an opening to communicate with an intake passage and a volume portion to communicate with the opening portion, a movable partition which can change the volume of the volume portion, and a movable cover associated with the movable partition for changing the opening area of the opening portion.

Abstract: Disclosed herein are a suction muffler for compressors, a compressor with the suction muffler, and an apparatus having a refrigerant circulation circuit including the compressor. The present invention allows an amount of a refrigerant sucked into a compression chamber to be maximized, and allows suction noise generated during a suction stroke to be minimized. The suction muffler includes a refrigerant channel, and an outer casing. The refrigerant channel communicates at an inlet thereof with a suction pipe which guides a refrigerant to a compressor, and controllably communicates at an outlet thereof with a compression chamber in which the refrigerant is compressed. The outer casing has a structure to convert a flowing motion of the refrigerant into a spiral flowing motion while the refrigerant flows from the suction pipe to the inlet. At least one resonance chamber is formed around an outlet of the refrigerant channel.

Abstract: A hermetic compressor is equipped with a suction muffler including: a muffling space having two rooms; a communication space to communicate these two rooms with each other; a first communication passage to communicate a movable valve with the muffling space and extending to an opening into the muffling space; and a second communication passage to communicate an enclosed container with the muffling space and extending to an opening into the muffling space. The openings into the muffling space from the first and the second communication passages are disposed in one of the two rooms, and the other room of the two rooms forms a resonance muffler whose resonance frequency matches a cavity resonance frequency of the enclosed container. The configuration can provide the hermetic compressor with a reduced noise emission and a high compression efficiency.

Abstract: A plurality of transmission ports which are respectively closed by air-permeable members are disposed in at least two members selected from among the intake duct, the air cleaner, and the air cleaner hose in the intake apparatus. Amounts of air permeation of the air-permeable members are set so as to be mutually different in order to tune intake sound generated from the inlet port and transmitted sound generated from each of the air-permeable members. In addition, a cleaner-incorporated member may be accommodated in the air cleaner, the cleaner-incorporated member having one end communicating with one of the intake duct and the air cleaner hose in such a manner as to be separated from an interior of the air cleaner and another end which is open in the interior of the air cleaner. An outer wall of the air cleaner is formed by a dual-use outer wall portion which also serves as an outer wall of the cleaner-incorporated member as well as an exclusive-use outer wall portion for forming only the air cleaner.

Abstract: An air intake device for an internal combustion engine comprises a primary inlet duct having an inlet opening, and a secondary inlet duct having a inlet end provided with an inlet opening and a rear end closed with a reflector wall. An outlet end of the primary duct is in fluid communication with the internal combustion engine, while the inlet opening of the secondary inlet duct is adapted to receive intake air. The primary inlet duct extends into the secondary inlet duct so as to form a double-tube chamber within the secondary inlet duct including a resonant cavity defined between the primary inlet duct and the secondary inlet duct. The double-tube chamber is sized so as to generate sound waves enhancing propagation of an intake air flow toward the at least one cylinder of the internal combustion engine through the primary inlet duct.

Abstract: The manufacturing method for the air intake apparatus has a holding-portion forming step, a temporarily fixing step, and a joining step. In the holding-portion forming step, a holding portion is formed. In the temporarily fixing step, the porous member is held by the holding portion. In the joining step, the holding portion and the porous member are joined together. Thus, an air intake apparatus, in which the opening is reliably covered with the porous member, can be manufactured. In the air intake apparatus manufactured by this manufacturing method, a peripheral portion of the porous member is doubly sealed with the holding portion that is an outer edge part of the opening. Consequently, the opening is reliably covered with the porous member, so that intake noise is reliably reduced.

Abstract: In a hermetic compressor for use on an air-conditioning unit as well as a refrigerating unit such as a refrigerator and a showcase, there is disclosed a constitution designed to provide a silently operated hermetic compressor that has an intake muffler readily assembled thereon. The hermetic compressor including a substantially disk-like elastic member disposed between the intake muffler at an outlet thereof and a cylinder head is provided, in which an outlet orifice of the intake muffler constantly remains pressed against an intake valve port through a gasket.

Abstract: An air induction assembly includes a tuning tube that is integrally formed with an air duct having a distal tube end extending into a resonance chamber. The air duct includes a shoulder portion that transitions into a base end of the tuning tube. The shoulder portion has a greater diameter than the tuning tube and defines an external duct surface. The resonance chamber includes an opening for receiving the tuning tube. A flange surrounds the opening and defines an external resonance chamber surface. The external resonance chamber surface abuts against the external duct surface to define an attachment interface. The assembly is welded at the attachment interface to securely attach the resonance chamber to the air duct.