The invention provides a lighting system (1) comprising a lighting unit (100) and a monolithic support element (200) for supporting the lighting unit (100), wherein the monolithic support element (200) comprises: —a support part (210) for supporting the lighting unit (100), wherein the support part (210) has a first length (L1), wherein the support part (210) has a support part outer shape and support part outer dimensions, wherein the support part (210) optionally includes a support part channel (211) over at least part of the first length (L1) having a first cross-sectional area (A1); —a first duct (220) having second length (L2), wherein the first duct (220) has a first duct outer shape and first duct outer dimensions, wherein the first duct (220) comprises a duct channel (221) over at least part of the second length (L2) having a second cross-sectional area (A2); —a transition part (230) bridging the support part (210) and the first duct (220); wherein one or mote of (i) the support part outer shape and the first duct outer shape differ, and (ii) the support part outer dimensions and the first duct outer dimensions differ.

A wind power generation apparatus, a tower and a method for suppressing a tower shadow effect of the tower. The tower is provided with suction through holes extending through a circumferential wall thereof, and the suction through holes are distributed in a circumferential direction of the tower; the tower is further provided with a suction apparatus, and the suction apparatus can perform suction to the suction through holes from outside to inside. With the tower and the method, when the suction through holes at a windward side are suctioned, the adverse influence of the tower shadow effect can be weakened or eliminated, a service life of a pitch varying bearing can be prolonged, a noise can be reduced and a wind energy utilization coefficient can be improved. When the suction through holes at a position of a bypassing flow detachment are suctioned, vortex-induced vibrations can also be suppressed.

A floating body device for suppressing vibration of enclosure includes a floating body surrounding the enclosure and an excitation device which can excite the floating body to float up and down. The excitation device includes a tether connected to the floating body to prevent the floating body from falling off from the enclosure. When the floating body floats up and down, an airflow boundary layer on an outer wall of a tower can be destroyed, and a cause of vortex-induced vibration can be directly suppressed. In addition, a change of an aerodynamic configuration is obtained. The up and down floating of the floating body disrupts both upper and lower sections of a nearby flow field, thus weakening a combined action thereof, thereby preventing the vortex induced vibration of the tower.

A floating body device for suppressing vibration of enclosure includes a floating body surrounding the enclosure and an excitation device which can excite the floating body to float up and down. The excitation device includes a tether connected to the floating body to prevent the floating body from falling off from the enclosure. When the floating body floats up and down, an airflow boundary layer on an outer wall of a tower can be destroyed, and a cause of vortex-induced vibration can be directly suppressed. In addition, a change of an aerodynamic configuration is obtained. The up and down floating of the floating body disrupts both upper and lower sections of a nearby flow field, thus weakening a combined action thereof, thereby preventing the vortex induced vibration of the tower.

An enclosure having an outer surface with a vortex-induced vibration suppression function is provided. The outer surface of the enclosure is provided with a plurality of annular recesses surrounding the enclosure, such that alternately concave and convex annular recesses and annular bosses configured for disrupting a boundary layer of a laminar flow are formed on the outer surface of the enclosure. An outer surface of the annular boss is provided with a plurality of air guiding grooves, and the plurality of air guiding grooves are distributed in a circumferential direction of the annular boss. The air guiding grooves are inclined upward or downward, such that part of an upwind incoming flow flowing to the annular boss can be guided into the annular recesses adjacent to the annular boss via the air guiding grooves. With the convex-concave outer surface, the cause of formation of the vortex-induced vibration can be prevented.

An enclosure having an outer surface with a vortex-induced vibration suppression function is provided. The outer surface of the enclosure is provided with a plurality of annular recesses surrounding the enclosure, such that alternately concave and convex annular recesses and annular bosses configured for disrupting a boundary layer of a laminar flow are formed on the outer surface of the enclosure. An outer surface of the annular boss is provided with a plurality of air guiding grooves, and the plurality of air guiding grooves are distributed in a circumferential direction of the annular boss. The air guiding grooves are inclined upward or downward, such that part of an upwind incoming flow flowing to the annular boss can be guided into the annular recesses adjacent to the annular boss via the air guiding grooves. With the convex-concave outer surface, the cause of formation of the vortex-induced vibration can be prevented.

The invention provides an elongated structure comprising a pole having a wall around a hollow core as a tubular body part extending along a length axis. A base section of the wall of the tubular body part is connected to an H-shaped frame extending from a foot of the pole along the length axis, said H-shaped frame being arranged in the core. The wall at the location of the H-shaped frame is provided with a door, said door in closed position being flush with the wall and in opened position providing access to the core.

An oscillation damper may comprise a suspension having a suspension length. The oscillation damper may comprise a pendulum which may be suspended by the suspension and may have a pendulum mass. The pendulum may comprise a fixed part which may have a side face. The pendulum may comprise a slideable part for collision with a movement limiter. The slideable part may be a substantial portion of the pendulum mass. The slideable part may comprise one or more stacked plates which may be positioned on the fixed part, and the one or more plates may extend beyond the side face. The oscillation damper may comprise a movement limiter. The movement limiter may face the pendulum.

An oscillation damper may comprise a suspension having a suspension length. The oscillation damper may comprise a pendulum which may be suspended by the suspension and may have a pendulum mass. The pendulum may comprise a fixed part which may have a side face. The pendulum may comprise a slideable part for collision with a movement limiter. The slideable part may be a substantial portion of the pendulum mass. The slideable part may comprise one or more stacked plates which may be positioned on the fixed part, and the one or more plates may extend beyond the side face. The oscillation damper may comprise a movement limiter. The movement limiter may face the pendulum.

The invention relates to the field of automobile elevators. An upright post structure is provided, wherein the upright post structure is a polygonal columnar structure formed by bending a plate, the upright post structure comprises a back plate, both ends of the back plate in a width direction vertically extend toward the same side of the back plate to form a side plate, end parts of the side plate away from the back plate extend oppositely to form a front plate, wherein the upright post structure further comprises one or a combination of various. Thus, when the upright post structure is subjected to a force in a horizontal direction, the local stress of the upright post is transferred so that the strength of the upright post is improved. The invention further provides automobile elevator using the upright post structure.