Abstract: A sound reducer (10) includes a housing (12) having a jacket (122) extending longitudinally along and rotationally symmetrical about a housing axis. Two end walls (123) are aligned transverse to the housing axis main pipe (18) and penetrating the housing (12) parallel offset to the housing axis with windows (182) formed as pipe wall openings. The main pipe (20) is sealingly fixed in passages penetrating the end walls (123). The end walls (123) have a convex base curvature that is rotationally symmetrical with the housing axis and, in the region of the passages, merge into outwardly pointing pipe sockets (16) that project in one piece and in one material from the respective end wall (123). Annular transition regions (14) are curved concavely in deviation from the convex base curvature with a radius that is at least 1/15 of the radius of the convex curvature of the base curvature.

Abstract: A control flap (1) has a flap body (2) and a circumferential seal (3) capable of sealing upon abutting to a sealing surface (7) of an opening (8). The flap body (2) and the seal (3) are made of elastomers. The seal (3) is joined to the flap body (2) by a pressure plate (4) made of a thermoplastic. The control flap may be made by a method that includes: producing the flap body (2) from a thermoplastic by injection molding; producing the pressure plate (4) from a thermoplastic by injection molding; producing the seal (3) from an elastomer by injection molding; introducing the pressure plate (4) into the undercut (10) of the seal (3); inserting the pressure plate (4) with the seal (3) into the recess (16) of the flap body (2) and bonding the pressure plate (4) and flap body (2).

Abstract: A sound reducer (10) has a housing (14) with a housing wall bounding an interior space (141). The housing wall has a mantle (142) extending longitudinally along a housing axis. Two end walls (143) are transverse to the housing axis. A main tube (12) extends through the interior space (141) and has a first and second ends (121). Windows (22) are formed as tube wall openings within the interior space (141). The first end (121) of the main tube (12) is fixed at a first passage (18a) through the housing wall, and the second end (122) of the main tube (12) is fixed at a second passage (18b) through the housing wall. At least the second passage (18b) passes eccentrically through one of the end walls (143). The main tube (12) is curved in a main plane and the first passage (18a) passes through the mantle (142).

Abstract: A control flap (1) has a flap body (2) and a circumferential seal (3) capable of sealing upon abutting to a sealing surface (7) of an opening (8). The flap body (2) and the seal (3) are made of elastomers. The seal (3) is joined to the flap body (2) by a pressure plate (4) made of a thermoplastic. The control flap may be made by a method that includes: producing the flap body (2) from a thermoplastic by injection molding; producing the pressure plate (4) from a thermoplastic by injection molding; producing the seal (3) from an elastomer by injection molding; introducing the pressure plate (4) into the undercut (10) of the seal (3); inserting the pressure plate (4) with the seal (3) into the recess (16) of the flap body (2) and bonding the pressure plate (4) and flap body (2).

Abstract: A device (1) for lowering flow noises has opposed first and second connection pieces (2, 3), and outer and inner sleeves (4, 5) between the connection pieces. A radial collar (6) is between the sleeves (4, 5) and forms separated volume chambers. Openings (11) in the inner sleeve (5) connect the volume chambers to a line space (13) enclosed by the inner sleeve (5). A sealing ring (15) at the free end (14) of the collar (6) defines a ring cap with a lateral surface (21) that reaches over the collar (6) and seals against the sleeve (4, 5) adjacent the free end (14) of the collar (6) and that has a surface (23, 26) that seals against either an end face (25) of the collar (6) or a side surface (28) of the collar (6) extending parallel to the radial collar (6).

Abstract: The invention relates to a venting device for venting an interior of a motor vehicle, including an air guiding element, which comprises at least one air outlet for venting the interior, and including an acoustic damping element disposed in the air guiding element, by means of which a sound pressure level occurring at the air outlet can be reduced. In order to provide such a venting device with improved acoustic characteristics, it is provided that the damping element is formed as a Helmholtz resonator.

Abstract: A supply scaffold for arranging in the interior of a tower, in particular in the interior of a tower of a wind power installation, and to a scaffold module for a supply scaffold of said type, and to a tower having a supply scaffold of said type, and to a wind power installation having a tower having a supply scaffold of said type. A method for erecting and/or operating a supply scaffold, and to a method for erecting a tower. The supply scaffold comprises multiple scaffold modules which are arranged one above the other and which are connected to one another, wherein, in the operational state of the supply scaffold, a first scaffold module is formed as a floor module which is arranged so as to stand on a floor, in particular a floor of the tower or a base platform of the tower, and wherein a further scaffold module is formed as a core module, which is arranged on the floor module.

Abstract: A resonator (1, 1?, 1?) for reducing airborne noise has at least one first ring-shaped chamber (2, 2?, 2?) arranged between an inlet piece (6, 6?) and an outlet piece (7, 7?). An inner tube (3) or inner tube pieces (4, 4?, 5) are arranged between the inlet piece (6, 6?) and outlet piece (7, 7?) and have wall apertures (18, 19, 28, 28?, 29, 29?, 30, 30?) as a connection to the adjacent ring-shaped chamber (2, 2?, 2?). The first ring-shaped chamber (2, 2?, 2?) is divided by at least one radially encircling dividing rib (13, 13?, 13?) into at least two sub-chambers (14, 14?, 14?, 15, 15?, 15?). The dividing rib (13, 13?, 13?) has a free end that, relative to the wall that is adjacent in a radial direction, forms an encircling annular space (16) for receiving an air layer that co-resonates in steady-state.

Abstract: A device (1) for lowering flow noises has opposed first and second connection pieces (2, 3), and outer and inner sleeves (4, 5) between the connection pieces. A radial collar (6) is between the sleeves (4, 5) and forms separated volume chambers. Openings (11) in the inner sleeve (5) connect the volume chambers to a line space (13) enclosed by the inner sleeve (5). A sealing ring (15) at the free end (14) of the collar (6) defines a ring cap with a lateral surface (21) that reaches over the collar (6) and seals against the sleeve (4, 5) adjacent the free end (14) of the collar (6) and that has a surface (23, 26) that seals against either an end face (25) of the collar (6) or a side surface (28) of the collar (6) extending parallel to the radial collar (6).

Abstract: A resonator (1, 1?, 1?) for reducing airborne noise has at least one first ring-shaped chamber (2, 2?, 2?) arranged between an inlet piece (6, 6?) and an outlet piece (7, 7?). An inner tube (3) or inner tube pieces (4, 4?, 5) are arranged between the inlet piece (6, 6?) and outlet piece (7, 7?) and have wall apertures (18, 19, 28, 28?, 29, 29?, 30, 30?) as a connection to the adjacent ring-shaped chamber (2, 2?, 2?). The first ring-shaped chamber (2, 2?, 2?) is divided by at least one radially encircling dividing rib (13, 13?, 13?) into at least two sub-chambers (14, 14?, 14?, 15, 15?, 15?). The dividing rib (13, 13?, 13?) has a free end that, relative to the wall that is adjacent in a radial direction, forms an encircling annular space (16) for receiving an air layer that co-resonates in steady-state.

Abstract: The present invention concerns a lifting apparatus, in particular a cross lifting beam, for lifting a first pylon segment of a concrete pylon of a wind power installation by means of a crane, including at least one fixing means for fixing the pylon segment to the lifting apparatus, and at least one release apparatus for releasing a connection between the lifting apparatus and the pylon segment.

Abstract: The present invention concerns a lifting apparatus, in particular a cross lifting beam, for lifting a first pylon segment of a concrete pylon of a wind power installation by means of a crane, including at least one fixing means for fixing the pylon segment to the lifting apparatus, and at least one release apparatus for releasing a connection between the lifting apparatus and the pylon segment.

Abstract: A device for dampening torsional vibrations, comprising a centering sleeve (1) for the reception of a rotatable element and a flywheel mass (2) is characterized in that, with regard to the objective to be solved, namely the realization of an arrangement having a constructively simple design and a highly dynamic stability, the centering sleeve (1) and the flywheel mass (2) are connected to each other. Furthermore, an arrangement comprising the mentioned device and a flexible coupling (5) is claimed.

Abstract: A device for dampening torsional vibrations, comprising a centering sleeve (1) for the reception of a rotatable element and a flywheel mass (2) is characterized in that, with regard to the objective to be solved, namely the realization of an arrangement having a constructively simple design and a highly dynamic stability, the centering sleeve (1) and the flywheel mass (2) are connected to each other. Furthermore, an arrangement comprising the mentioned device and a flexible coupling (5) is claimed.

Abstract: A shaft bearing, which includes a roller bearing (1) having an outer ring (2) enclosed at its outer circumference by a supporting ring (3) at a radial distance, at least one first spring element (5), which is elastically yielding in the axial direction and the radial direction, being positioned in the gap (4) formed by the radial distance.