Abstract: A device for subjecting a cantilevered wind turbine blade to transverse force during a fatigue test of the wind turbine blade, the device comprising: a pivot arm having a longitudinal pivot arm axis and being pivotally supported in an arm supporting structure for pivoting about an essentially horizontal pivot axis, a mass member being connected to the pivot arm, and a coupling member providing a connection between the pivot arm and a blade fixture configured to be fixedly connected to the blade, the pivot axis, the mass member and the coupling member being mutually spaced along the longitudinal pivot arm axis. The system comprises the device and an exciter configured for cyclically subjecting the cantilevered blade to a transverse reciprocating movement.

Abstract: Methods for performing maintenance on a rotor blade of a wind turbine rotor comprising at least a first rotor blade with an airfoil body formed from a blade shell element, the airfoil body having a suction-side surface and a pressure-side surface, a leading edge and a trailing edge, and a root end for mounting to a wind turbine hub and a distal tip end are disclosed, as well as a related system for same. The method comprising the steps of bringing the wind turbine rotor to a standstill, introducing a mobile maintenance device into said first rotor blade at the blade root, moving said mobile maintenance device inside said first rotor blade to a location, performing a maintenance operation at the location with said mobile maintenance device, and removing said mobile maintenance device from said first rotor blade.

Abstract: A wind turbine blade is described having a de-icing system which is arranged to heat at least a portion of the leading edge of the wind turbine blade, to prevent the formation of ice on the blade, or to remove any existing surface ice. The de-icing system comprises insulated flow channels which are arranged to circulate a heated fluid from a heating element to the tip end of the blade, and to de-ice the blade leading edge starting from the tip end towards the root end of the blade. The de-icing system is arranged to operate in the outboard portion of the blade, where the de-icing effect provides the most benefits to turbine operation. Further features of the de-icing system include an improved mounting arrangement of the de-icing system, an improved tip end configuration of the de-icing system, and providing portions of the de-icing system as double-walled inflatable insulating tubes.

Abstract: Methods for performing maintenance on a rotor blade of a wind turbine rotor comprising at least a first rotor blade with an airfoil body formed from a blade shell element, the airfoil body having a suction-side surface and a pressure-side surface, a leading edge and a trailing edge, and a root end for mounting to a wind turbine hub and a distal tip end are disclosed, as well as a related system for same. The method comprising the steps of bringing the wind turbine rotor to a standstill, introducing a mobile maintenance device into said first rotor blade at the blade root, moving said mobile maintenance device inside said first rotor blade to a location, performing a maintenance operation at the location with said mobile maintenance device, and removing said mobile maintenance device from said first rotor blade.

Abstract: A wind turbine blade is described having a de-icing system which is arranged to heat at least a portion of the leading edge of the wind turbine blade, to prevent the formation of ice on the blade, or to remove any existing surface ice. The de-icing system comprises insulated flow channels which are arranged to circulate a heated fluid from a heating element to the tip end of the blade, and to de-ice the blade leading edge starting from the tip end towards the root end of the blade. The de-icing system is arranged to operate in the outboard portion of the blade, where the de-icing effect provides the most benefits to turbine operation. Further features of the de-icing system include an improved mounting arrangement of the de-icing system, an improved tip end configuration of the de-icing system, and providing portions of the de-icing system as double-walled inflatable insulating tubes.

Abstract: Wind turbine blade comprising a sensor system with an optical path comprising a first optical sensor fiber, a second optical sensor fiber and a patch optical fiber, the first optical sensor fiber including a first core with a first core diameter wherein the first optical sensor fiber extends from a first end to a second end and comprising at least one sensor, the second optical sensor fiber including a second core with a second core diameter, wherein the second optical sensor fiber extends from a first end to a second end and comprising at least one sensor, the patch optical fiber including a patch core with a patch core diameter, wherein the patch optical fiber extends from a first end to a second end and connects the first optical sensor fiber and the second optical sensor fiber, wherein the first core diameter is the same as the patch core diameter.

Abstract: Wind turbine blade comprising a sensor system with an optical path comprising a first optical sensor fiber, a second optical sensor fiber and a patch optical fiber, the first optical sensor fiber including a first core with a first core diameter wherein the first optical sensor fiber extends from a first end to a second end and comprising at least one sensor, the second optical sensor fiber including a second core with a second core diameter, wherein the second optical sensor fiber extends from a first end to a second end and comprising at least one sensor, the patch optical fiber including a patch core with a patch core diameter, wherein the patch optical fiber extends from a first end to a second end and connects the first optical sensor fiber and the second optical sensor fiber, wherein the first core diameter is the same as the patch core diameter.