Noise attenuation units are disclosed that are connectable in a system as part of a fluid flow path. Such units include a housing defining an internal cavity and having a first port and a second port each connectable to a fluid flow path and in fluid communication with one another through the internal cavity, and a noise attenuating member seated in the internal cavity of the housing within the flow of the fluid communication between the first port and the second port. The noise attenuating member enables the fluid communication between the first port and the second port to flow through the noise attenuating member.

A gas compressor assembly configured to pressurize an airflow received from the ambient for delivery to an internal combustion engine having a cylinder includes a compressor housing. A compressor wheel is disposed inside the compressor housing and configured to pressurize the airflow. A compressor bypass is configured to direct the pressurized airflow away from the cylinder. A pressure relief valve is configured to selectively open and close the compressor bypass to thereby limit pressure of the pressurized airflow and minimize surge of the compressor wheel. A baffle arranged inside the compressor bypass is configured to dissipate energy of a sound wave generated by the pressurized airflow upon an initial opening of the pressure relief valve. An internal combustion engine employing such a turbocharger is also disclosed.

The invention concerns a device (1) for attenuating intake noise and radiated noise that comprises an internal gas delivery conduit (2) linked to a combustion engine, the conduit (2) having a peripheral wall (23) on at least one portion of which there is disposed at least one element porous to air (4), sound attenuation means comprising at least one tube (3) disposed in the delivery conduit, at least one peripheral chamber (5) being delimited inside the conduit (2) between the tube (3) and the peripheral wall (23) of the conduit (2), the tube (3) comprising at least one portion having an opening (30) allowing the inside of the tube (3) to communicate with the peripheral chamber (5).

An air duct for a vehicle functions to reduce intake noise and includes an outer housing configured having a pipe shape so that outside air is introduced into an engine therethrough. The air duct also has an inner pipe fixed in the outer housing so that an outer surface of the inner pipe is spaced apart from an inner surface of the outer housing, thereby partitioning the inside of the outer housing in a radial direction. A space between the inner pipe and the outer housing communicates with the inside of the inner pipe.

An acoustic attenuator 20 for an engine booster such as a turbocharger 10 for an engine 4 is disclosed in which the acoustic attenuator 20 includes an attenuator chamber 28 in which is located at least one absorption media 140. The acoustic attenuator 20 is located adjacent an inlet port of the turbocharger 10 so as to attenuate any acoustic pressure waves by dissipative reaction with the absorption media 140 before they have chance to reach other components of a low pressure supply system 50 for the engine 4.

Methods and systems are provided for mitigating noise generated by a compressor operating at low flow rates. A swirl device with two concentric flow passages upstream of the compressor directs intake air flow to the compressor through two different flow paths, depending on air flow rates. Angled swirl vanes at an outlet of the swirl device pre-whirl the air flowing to the compressor to reduce noise generation at low air flow rates.

A system includes a modularized air inlet system. The modularized air inlet system includes an air filter house section configured to receive air via an air inlet. The modularized air inlet system also includes a transition/silencer section configured to direct the air from the modularized air inlet system, via an air outlet, into an air inlet plenum coupled to a gas turbine engine enclosure. The modularized air inlet system is configured to couple directly to the air inlet plenum and the gas turbine enclosure without an expansion joint disposed between the modularized air inlet system and the air inlet plenum.

An acoustic component is provided with a flow channel for a fluid. The flow channel has an inlet pipe and an outlet pipe. A flow channel section is arranged between the inlet pipe and the outlet pipe, wherein the flow channel section has a silencer volume connected in the flow channel section via openings to the flow channel. A flow deflection device is arranged at least in the flow channel section with the silencer volume, wherein the flow deflection device deflects a flow of the fluid in the flow channel section with the silencer volume away from the openings. The openings in the flow channel section are arranged in a sheltered zone of the flow deflection device.

Methods and systems are provided for a noise attenuation device. In one example, a system may include a noise attenuation device located downstream of a throttle body with a height less than or equal to a difference in diameter between a bore of the throttle body and an intake passage.

A valve device for a motor vehicle includes: a housing; a duct arranged in the housing; a flap arranged in the duct and configured to close the duct; a shaft mounted in the housing, upon which shaft the flap is attached; an electric motor configured to drive the shaft; and a stationary conducting element arranged in the duct downstream of the flap.