# US 10,502,187 B2 · Rotor blade with noise reduction means > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,187 B2 - Document ID: US10502187B2 - Status: Granted - Kind: B2 - Application number: 15/587,220 - Filed: 2017-05-04 - Published: 2017-11-30 - Granted: 2019-12-10 - Earliest claimed: 2016-05-27 - Assignees: Siemens Gamesa Renewable Energy A/S - Applicants: Siemens Gamesa Renewable Energy - Inventors: Peder Bay Enevoldsen; Stefan Oerlemans; Bodo Richert; Bo Birkemose - Web page: https://patentgrep.com/patent/US10502187B2 ## CPC - F03D 7/0296: {to prevent, counteract or reduce noise emissions} - F03D 1/0675: {of the blades} - F03D 17/00: Monitoring or testing of wind motors, e.g. diagnostics (testing during commissioning of wind motors F03D13/30) - F05B 2260/962: by means creating "anti-noise" - F05B 2270/333: Noise or sound levels - Y02E 10/72: Wind turbines with rotation axis in wind direction - F03D: WIND MOTORS - 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 A rotor blade with a leading edge and a trailing edge, wherein the rotor blade is designed and configured for being exposed to a fluid flowing substantially from the leading edge to the trailing edge) of the rotor blade, the rotor blade includes at least one sensor for detecting flow characteristics of the fluid, and the rotor blade further includes at least one actuator for producing an anti-noise signal. The sensor and the actuator are both arranged at the surface of the rotor blade, and the actuator is arranged and prepared such that flow-induced edge noise of the rotor blade, which is generated by the fluid, is at least partly cancelled out by the anti-noise signal. The disclosure furthermore relates to a wind turbine including at least one such rotor blade. ## Claims ### Claim 1 A rotor blade with a leading edge and a trailing edge, wherein the rotor blade is designed and configured for being exposed to a fluid flowing substantially from the leading edge to the trailing edge of the rotor blade, the rotor blade comprises at least one sensor for detecting flow characteristics of the fluid, and the rotor blade further comprises at least one actuator for producing an anti-noise signal, the sensor and the actuator are both arranged at the surface of the rotor blade, the actuator is arranged and prepared such that flow-induced edge noise of the rotor blade, which is generated by the fluid, is at least partly cancelled out by the anti-noise signal, and a control unit, located inside the rotor blade, for constructing the anti-noise signal. ### Claim 2 (depends on 1) The rotor blade according to claim 1, wherein the rotor blade comprises a portion which has the shape of an airfoil comprising a pressure side and a suction side, and the pressure side and the suction side are each confined by the trailing edge and the leading edge. ### Claim 3 (depends on 1) The rotor blade according to claim 1, wherein the actuator comprises a loudspeaker. ### Claim 4 (depends on 1) The rotor blade according to claim 1, wherein the sensor comprises a surface pressure transducer. ### Claim 5 (depends on 1) The rotor blade according to claim 1, wherein the flow-induced edge noise, which is at least partly cancelled out by the anti-noise signal being produced by the actuator, is generated at the trailing edge of the rotor blade. ### Claim 6 (depends on 1) The rotor blade according to claim 1, wherein the sensor is located upstream of the actuator with regard to the flow direction of the fluid. ### Claim 7 (depends on 1) The rotor blade according to claim 1, wherein the sensor and the actuator are both located either on the pressure side or on the suction side of the rotor blade. ### Claim 8 (depends on 1) The rotor blade according to claim 1, wherein the sensor is located at the suction side and the actuator is located at the pressure side or vice versa. ### Claim 9 (depends on 1) The rotor blade according to claim 1, wherein the actuator is connected with the sensor via a connection device and the control unit. ### Claim 10 (depends on 1) The rotor blade according to claim 1 wherein the sensor is arranged and prepared to sense surface pressure fluctuations induced by the fluid which is passing by the sensor. ### Claim 11 (depends on 1) The rotor blade according to claim 1, wherein the surface pressure fluctuations produced by the actuator are based on the surface pressure fluctuations sensed by the sensor. ### Claim 12 (depends on 1) The rotor blade according to claim 1, wherein the actuator is arranged and prepared to induce at least partial cancellation of unsteady surface pressures. ### Claim 13 (depends on 9) The rotor blade according to claim 9, wherein the actuator is arranged and prepared to emit a sound signal. ### Claim 14 (depends on 1) A wind turbine with at least one rotor blade according to claim 1. ### Claim 15 A rotor blade with a leading edge and a trailing edge, wherein the rotor blade is designed and configured for being exposed to a fluid flowing substantially from the leading edge to the trailing edge of the rotor blade, the rotor blade comprises at least one sensor for detecting flow characteristics of the fluid, and the rotor blade further comprises at least one actuator for producing an anti-noise signal, the sensor and the actuator are both arranged at the surface of the rotor blade, and the actuator is arranged and prepared such that flow-induced edge noise of the rotor blade, which is generated by the fluid, is at least partly cancelled out by the anti-noise signal, wherein the actuator is directly connected with the sensor via connection device, wherein the connection device is a tube or a channel.