Damping cardanic suspension for pendulum dampers
A new type of independently damping pendulum suspension for pendulum dampers for use in tall slender constructions and technical installations, more particularly used in wind turbines. A Cardan joint is equipped with damping elements and mounted at the other end opposite the pendulum mass. The Cardan joint is able, despite the small motions, to sufficiently damp the oscillations of the pendulum produced by disturbing frequencies.
1. A damping pendulum suspension ( 1 ), for a pendulum damper in a vibration system, comprising:
a Cardan joint ( 1 ) having two cross-connected shafts ( 1 . 3 ), and
a holding device ( 1 . 7 ) for receiving and holding a pendulum rod with a pendulum mass,
wherein each of the two shafts ( 1 . 3 ) of the Cardan joint ( 1 . 1 ) has (i) at least one transmission gearing ( 1 . 2 ),
(ii) at least one rotating damping unit ( 1 . 4 ) which generates eddy current, and the damping element ( 1 . 4 ) being attached, in each case, to a rapidly rotating gearing output side ( 1 . 2 ),
(iii) an elastomeric torsional bearing, in a shape of a bushing ( 19 ), is connected to each of the shafts ( 1 . 3 ) via a slowly rotating gearing input side, and
(iv) a torque arm ( 23 ) is provided, which transmits only circulating torque, and is mounted largely load-free in a remaining spatial axes, so that an entire angle of movement of the damper is shifted into the gearing rotation.
2. The pendulum suspension according to claim 1 , wherein the elastomeric bushing is provided in a conical form ( 19 . 1 ).
3. The pendulum suspension according to claim 1 , wherein the torque arm ( 23 ) is provided with an idle angle ( 24 ) in order to achieve a pulse effect.
4. The pendulum suspension according to claim 1 wherein the eddy-current damping element ( 1 . 4 ) comprises a conductor disk ( 1 . 4 . 3 , 1 . 4 . 4 ) and a disk ( 1 . 4 . 1 , 1 . 4 . 4 ) provided with permanent magnets or electromagnets ( 1 . 4 . 2 ), the two disks are separated from one another by an air gap so as to face one another, and, triggered by a pendulum movement, one disk rotates relative to the other disk about a relevant shaft ( 1 . 3 ), as a result of which an eddy current is generated which damps the pendulum movement.
5. The pendulum suspension according to claim 4 , wherein the damping elements ( 1 . 4 ) have a rotating mass ( 1 . 4 . 7 ) which is attached to the respective rotating disk ( 1 . 4 . 1 or 1 . 4 . 4 ).
6. The pendulum suspension according to claim 5 , wherein the rotating mass ( 1 . 4 . 7 ) is variably adjustable such that a natural frequency of the vibration system is influenced.
7. The pendulum suspension according to claim 1 , wherein the rotating damping element ( 1 . 4 ) is rotationally symmetrical and has a variable diameter such that the damping of the vibration system is influenced.
8. The pendulum suspension according to claim 1 wherein the pendulum suspension has two or more transmission gearings ( 1 . 2 ) each having a different transmission and/or a different damping according to different directions in which damping is intended to be achieved.
9. A pendulum damper comprising at least one damping pendulum suspension according to claim 1 , and at least one pendulum rod ( 2 ) or linkage rod ( 6 ) and a pendulum mass ( 3 , 7 ).
10. The pendulum damper according to claim 9 , wherein the pendulum suspension ( 1 ) is attached at the end of the pendulum rod ( 2 ) opposite the pendulum mass ( 3 ).
11. The pendulum damper according to claim 10 , wherein the pendulum damper is designed as a transversal pendulum damper, and the pendulum mass ( 7 ) is attached to and guided on articulated linkage roads ( 6 ).
12. The pendulum damper according to claim 9 , wherein the pendulum damper is attached in a tower, in or beneath a nacelle or underneath a helicopter platform of a wind turbine.
13. A wind turbine, comprising a tower and a nacelle having a rotor and rotor blades, wherein the wind turbine has a pendulum damper according to claim 9 .
14. A wind turbine, comprising a tower and a nacelle having a rotor and rotor blades, wherein the wind turbine has a pendulum suspension according to claim 1 .