Vibration absorber arrangement for reducing the transmission of vibrations
The invention relates to a vibration damper assembly ( 40; 140 ) for an elongate first component ( 10; 30 ), which is arranged at a connecting end ( 11; 31 ) in a longitudinal direction (LD) of the first component ( 10; 30 ) for mechanical connection to a second component ( 20 ). The vibration damper assembly ( 40; 140 ) comprises at least two damper groups ( 41 a, 41 b, 41 c, 41 d, 41 e ) which are arranged in an end section ( 12; 32 ) of the first component ( 10; 30 ) with the connection end ( 11; 31 ) and are spaced apart from one another in the longitudinal direction (LD), wherein each of the damper groups ( 41 a, 41 b, 41 c, 41 d, 41 e ) comprises a plurality of individual vibration dampers ( 42 a, 42 b, 42 c, 42 d, 42 e ) which are arranged distributed on a circumferential wall ( 14 ) of the first component ( 10; 30 ) in a circumferential direction (CD). In order to reduce the problems caused by tonalities in wind energy installations ( 1 ) in a simple and cost-effective way, the damper groups have different natural frequencies from each other. The invention also relates to a wind energy installation ( 1 ).
1 . A vibration damper arrangement for an elongated first component which is arranged at a connection end along a longitudinal direction of the first component for mechanical connection to a second component, wherein the second component is a wind turbine nacelle with a drive train,
wherein the vibration damper arrangement comprises at least three damper groups which are arranged in an end section of the first component with the connection end and are spaced apart from one another along the longitudinal direction,
wherein each of the damper groups comprises a plurality of individual vibration dampers which are arranged distributed along a circumferential direction on a circumferential wall of the first component,
wherein a natural frequency of the respective individual vibration damper is designed by means of a damper mass and a stiffness of the individual vibration damper,
wherein the vibration damper arrangement is configured to reduce the transmission of vibrations caused by vibrations in the drive train locally in the end section at the connection end,
wherein the damper groups have natural frequencies differing from one another, wherein the individual vibration dampers of a respective damper group differ in their damper mass and/or their stiffness from the individual vibration dampers of the other damper groups, and
wherein the respective damper group has a frequency reduction range around its natural frequency, wherein the frequency reduction range of a respective damper group overlaps with at least one of the frequency reduction ranges of another one of the damper groups.
2 . The vibration damper arrangement according to claim 1 , wherein the individual vibration dampers of the respective damper groups are arranged in a ring shape.
3 . The vibration damper arrangement according to claim 1 wherein the first component is a wind turbine tower, and the connecting element is an upper end of the wind turbine tower for supporting the wind turbine nacelle.
4 . The vibration damper arrangement according to claim 3 , wherein adjacent damper groups are spaced apart by less than 300 cm along the longitudinal direction, and/or wherein the individual vibration dampers within the respective damper group are spaced apart from one another by less than 200 cm along the circumferential direction (CD).
5 . The vibration damper arrangement according to claim 1 , wherein the second component is the wind turbine nacelle with a rotor hub, characterized in that the first component is a wind turbine rotor blade, wherein the connection end is a blade root for attachment to the rotor hub.
6 . The vibration damper arrangement according to claim 5 , wherein adjacent damper groups are spaced apart by less than 300 cm along the longitudinal direction, and/or wherein the individual vibration dampers within the respective damper group are spaced apart by less than 100 cm along the circumferential direction.
7 . The vibration damper arrangement according to claim 1 , wherein the individual vibration dampers within the respective damper group have the same natural frequency and/or are of the same type.
8 . The vibration damper arrangement according to claim 1 , wherein the vibration damper arrangement is arranged completely in the end section.
9 . The vibration damper arrangement according to claim 1 , wherein at least one of the damper groups is arranged in a region which extends from the connection end over 10% of a total length of the first component along the longitudinal direction.
10 . The vibration damper arrangement according to claim 9 , wherein at least two of the damper groups are arranged in the region extending from the connection end over 10% of the total length of the first component along the longitudinal direction.
11 . The vibration damper arrangement according to claim 1 , wherein the end section extends from the connection end over a maximum of 14% of the total length of the first component along the longitudinal direction.
12 . The vibration damper arrangement according to claim 1 , wherein all individual vibration dampers are passive vibration dampers.
13 . A wind turbine, characterized in that the wind turbine comprises the vibration damper arrangement according to claim 1 .