The device (2) has an exhaust line (5) including a double-flow design in a rear section (X). The double-flow section includes two exhaust pipes (11) with acoustic actuators (12), which are connected to the exhaust pipes in a sound-transmitting manner. The ...

A silencer for installation in a fuel cell system includes a plurality of expansion chambers adapted to connect to a predetermined apparatus of the fuel cell system, wherein the plurality of expansion chambers are adapted to serially reduce acoustic noise ...

The silencer (100) has a flow channel (12) aerodynamically formed between a silencer inlet (11) and a primary chamber (15) such that exhaust gas predominantly flows into the primary chamber based on mass inertia and flows back toward to the silencer inlet ...

The resonator collar (9) connects the pipe (5) with a resonator volume (6). This has a constant internal cross sectional area, avoiding flow constriction, and a variable inner cross sectional geometry along its length (11).

Openings in the covering sheet of the chamber (32) are formed as slots orientated along the flow direction. The open areas (33) amount to about 6-14% of the total area (31) of the chamber. Slot length to width ratio exceeds 3, and the slots differ in lengt...

An exhaust processor (10) has an exhaust tube (18) and a cover (46) mounted for rotation at least partially around the exhaust tube (18) to adjust the tuning frequency of the exhaust processor (10). A method of operating the exhaust processor (10) is also ...

The silencer consists of a sleeve (11) inserted in the exhaust pipe that has an integral Helmholz resonator. This has a number of chambers (13) coupled by tapered orifices (12). The greater the included angle of the taper the thinner the wall section (s) o...

Engine comprising a flow channel (7) for gaseous fluids having means adapted to vary a sound pressure level of a sound of the gaseous fluids at at least one predetermined frequency, wherein said means comprises at least one side branch tube and/or at least...