Rotor blade with noise reduction means

A method for constructing a rotor blade comprising:

• providing 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;
• providing at least two sensors configured for detecting flow characteristics of the fluid and providing respective sensor signals;
• providing at least two actuators, each configured for producing an anti-noise signal based on at least one of the at least two sensor signals;
• arranging the at least two actuators chordwise at a surface of the rotor blade;
• and
• arranging the at least two sensors spanwise at the surface of the rotor blade,
• wherein the at least two sensors are arranged in a group that corresponds with a chordwise distribution of the actuators;
• and
• wherein the at least two actuators are 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 signals.