# US 11,078,890 B2 · Oscillating damper for damping tower harmonics > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,078,890 B2 - Document ID: US11078890B2 - Status: Granted - Kind: B2 - Application number: 16/417,423 - Filed: 2019-05-20 - Published: 2019-11-28 - Granted: 2021-08-03 - Earliest claimed: 2018-05-22 - Assignees: Engiso ApS - Applicants: ENGISO ApS - Inventors: Børge Øllgaard - Web page: https://patentgrep.com/patent/US11078890B2 ## CPC - F03D 80/88: {of mechanical components} - E04H 12/00: Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures (cooling towers E04H5/12; derricks for oil drilling E21B15/00) - F03D 13/20: Arrangements for mounting or supporting wind motors; Masts or towers for wind motors - F16F 7/10: using inertia effect (F16F13/108, F16F13/22, F16F15/10, F16F15/22 take precedence; stabilising vehicle bodies by means of movable masses B62D37/04; protection of buildings against vibrations or shocks by mass dampers E04H9/0215; arrangements or devices for damping mechanical oscillations of power lines H02G7/14) - F16F 15/02: Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems ({F16F15/005 takes precedence } ; layered products B32B; suppression of vibration in ships B63; {relieving load on bearings, using magnetic means F16C39/06}) - E04H 9/0215: {involving active or passive dynamic mass damping systems} - F05B 2260/964: by damping means - F16F 2230/007: with, or used as an end stop or buffer; Limiting excessive axial separation - F16F 2232/00: Nature of movement - F16F 2238/04: Damper - Y02E 10/72: Wind turbines with rotation axis in wind direction - Y02E 10/728: Onshore wind turbines - F03D: WIND MOTORS - E04H: BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL (foundations E02D) - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION - F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract 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. ## Claims ### Claim 1 A tower having at least one harmonic frequency, the tower comprising at least one oscillation damper for damping the at least one harmonic frequency wherein the at least one oscillation damper includes a suspension having a suspension length that is 10-50% longer than a length of the at least one harmonic frequency to be damped; a pendulum suspended by the suspension, the pendulum including a pendulum mass, and a fixed part having a planar side face and a planar upper face; a movement limiter facing the pendulum; and wherein the pendulum further includes a slideable part positioned on the planar upper face, the slideable part and the planar side face configured and arranged for collision with the movement limiter, the slideable part being a substantial portion of the pendulum mass and including one or more stacked plates positioned on the planar upper face of the fixed part and extending beyond the planar side face, wherein the one or more stacked plates are displaceable relative to the planar upper face. ### Claim 2 (depends on 1) The tower according to claim 1, characterised in that the one or more stacked plates are stacked with gradually larger horizontal extent. ### Claim 3 (depends on 1) The tower according to claim 1, characterised in that the one or more stacked plates constitute 20% to 90% of the pendulum mass. ### Claim 4 (depends on 1) The tower according to claim 1, characterised in that the fixed part includes a top part and a bottom part, the bottom part connected to the top part, and wherein the one or more stacked plates are positioned on the bottom part. ### Claim 5 (depends on 1) The tower according to claim 1 characterised in that the at least one oscillation damper is positioned at a top-tower section, the at least one oscillation damper is configured and arranged for damping a first harmonic frequency of the tower. ### Claim 6 (depends on 5) The tower according to claim 5, characterised in that the at least one oscillation damper is configured and arranged for damping a second harmonic frequency of the tower and is positioned near a second harmonic oscillation of the tower. ### Claim 7 (depends on 1) The tower according to claim 1, wherein the tower is a wind turbine tower. ### Claim 8 (depends on 1) The tower according to claim 1, wherein the one or more stacked plates constitute 20% to 60% of the pendulum mass. ### Claim 9 (depends on 1) The tower according to claim 1, wherein the one or more stacked plates constitute 20% to 40% of the pendulum mass. ### Claim 10 A tower having at least two harmonic frequencies, the tower comprising at least one oscillation damper configured and arranged for damping the second harmonic frequency of the tower, and is positioned near a second harmonic oscillation of the tower, the at least one oscillation damper includes a suspension having a suspension length; a pendulum suspended by the suspension, the pendulum including a pendulum mass, and a fixed part having a planar side face and a planar upper face; a movement limiter facing the pendulum; and wherein the pendulum further includes a slideable part positioned on the planar upper face, the slideable part and the planar side face configured and arranged for collision with the movement limiter, the slideable part being a substantial portion of the pendulum mass and including one or more stacked plates positioned on the planar upper face of the fixed part and extending beyond the planar side face, wherein the stacked plates are displaceable relative to the upper face. ### Claim 11 (depends on 10) The tower according to claim 10, characterised in that the one or more stacked plates are stacked with gradually larger horizontal extent. ### Claim 12 (depends on 10) The tower according to claim 10, characterised in that the one or more stacked plates constitute 20% to 90% of the pendulum mass. ### Claim 13 (depends on 10) The tower according to claim 10, characterised in that the fixed part includes a top part and a bottom part connected to the top part, and wherein the one or more stacked plates are positioned on the bottom part.