Abstract: A pumped-storage power plant may include a working cylinder partially submerged in a working fluid reservoir having an upper fluid compartment above a fluid level of the working fluid reservoir and a lower fluid compartment below the fluid level, a buoyant piston movably guided in the direction of gravity relative to the working cylinder and which seals off the upper fluid compartment such that a gravitationally induced exchange of fluid between the upper and the lower fluid compartment is prevented. The plant may operate in an energy charging mode where working fluid is introduced into the upper fluid compartment so that the buoyant piston is submerged in the lower fluid compartment, and an energy delivery mode where upper fluid is pressed out of the upper fluid compartment and/or a fluid column of the upper fluid built up during the energy charging mode is discharged from the upper fluid compartment.

Abstract: A hanger for an exhaust suspension has a mass dampener structure having a dampener mass with a central passage, an elastomer spring in the form of a sleeve received in the passage of the dampener mass and spring has an arrangement for connecting the mass dampener structure to a connecting pin. The mass dampener structure is connected to a first ring portion by an arrangement including a pair of elastomer arms. The elastomer spring is tuned to have a stiffness greater than the remaining portion of the hanger.

Abstract: The invention relates to a silencer (1) for noise-laden gas pipes, especially for a suction pipe and/or an exhaust pipe of an internal combustion engine, comprising an outer pipe (2) with an inlet side (3) and an outlet side (4), a plurality of diaphragm rings (9, 9′, 9″, ′″, 9″″) each with an outer surface connected (5) to the inner surface of the outer pipe (2), at least one insert (6) with an outer surface connected (7) to the inner surface of the outer pipe (2) and/or the diaphragm rings (9, 9′, 9″, 9′″, 9″″) and with a plurality of openings (8) which are closed on one side. Said insert (6) forms sub-pipes for the gas flow in the silencer, and the openings (8), which are closed on one side, open into the sub-pipes, the depth thereof being /4 in relation to the wavelength of a frequency to be silenced.

Abstract: An internal vibration absorber, configured to be installed in hollow shafts, includes a central absorber mass, a rigid outer shell coaxially surrounding the absorber mass, and an elastomeric spring element interconnecting the central mass and the outer shell in an elastic/resilient manner. The elastomeric spring element includes circumferentially spaced resilient radial spacers, which are functionally independent from one another. The radial spacers may extend axially along the entire length of the absorber mass, or the spacers may engage the absorber mass at axially spaced apart locations. All spacers engage axially the central absorber mass at such a distance apart that an appreciable wobbling of the absorber mass within the shell is impossible even when the absorber mass is in soft resilient suspension.

Abstract: The invention relates to a silencer (1) for noise-laden gas pipes, especially for a suction pipe and/or an exhaust pipe of an internal combustion engine, comprising an outer pipe (2) with an inlet side (3) and an outlet side (4), a plurality of diaphragm rings (9, 9′, 9″, 9′″,9″″) each with an outer surface connected (5) to the inner surface of the outer pipe (2),at least one insert (6) with an outer surface connected (7) to the inner surface of the outer pipe (2) and/or the diaphragm rings (9, 9′, 9″, 9′″, 9″″) and with a plurality of openings (8) which are closed on one side. Said insert (6) forms sub-pipes for the gas flow in the silencer, and the openings (8), which are closed on one side, open into the sub-pipes, the depth thereof being /4 in relation to the wavelength of a frequency to be silenced.

Abstract: An internal vibration absorber, configured to be installed in hollow shafts, includes a central absorber mass, a rigid outer shell coaxially surrounding the absorber mass, and an elastomeric spring element interconnecting the central mass and the outer shell in an elastic/resilient manner. The elastomeric spring element includes circumferentially spaced resilient radial spacers, which are functionally independent from one another. The radial spacers may extend axially along the entire length of the absorber mass, or the spacers may engage the absorber mass at axially spaced apart locations. All spacers engage axially the central absorber mass at such a distance apart that an appreciable wobbling of the absorber mass within the shell is impossible even when the absorber mass is in soft resilient suspension.

Abstract: The broadband surface-like absorber of the invention is used, in particular, for absorbing troublesome airborne noise in the acoustic frequency range. The broadband surface-like absorber, which operates on the Helmholtz resonator principle, is distinguished by a checkerwork of irregular construction, the webs of which are aligned with their narrow sides perpendicular to the principal surface of the perforated plate and the side edges of which are connected in a sound-pressure-resistant and fluidtight manner on the sound side to the rear side of the perforated plate and, on the rear side, to an extended-area cavity boundary aligned with the same orientation as the perforated plate to form differently tuned chamber resonators.

Abstract: The invention relates to a directly hydraulically damping broadband damper designed as a sequence of Helmholtz resonators with elastomer/gas springs to damp pressure pulses in pressurized liquids and in the audible range frequencies, in particular in hydraulic servo systems.

Abstract: An intake silencer is designed as a broadband silencer for noises causes by intake of combustion air into internal combustion engines. To achieve the broadband effect, an axial sequence of resonator chambers with different volumes is formed by partitions which extend transversely to the intake pipe in a resonator that surrounds the intake pipe Each resonator chamber communicates through openings in the wall of the intake pipe with the air sucked through the intake pipe. By matching the open surface area of the openings, the thickness of the wall of the intake pipe in the area of the openings and the volume of the resonator chambers, a continuous broadband silencing may be set even over a wide frequency range, the range of practical interest in the present application extending combustion from to 1 to 10 kHz.