Draw-wire sensors from Micro-Epsilon are being used in the testing of new wind turbine rotor blades at the Fraunhofer Institute IWES, Bremerhaven. The test rig, which simulates rotor blade distortion due to wind loads, is designed for rotor blades with a maximum length of 70 m.
The rotor blade is mounted horizontally in the test rig and the tip of the rotor blade can be distorted by up to 10 m through mechanical loading. Steel cables are routed to the rotor using guide pulleys and attached to the rotor blade at various positions. For each steel cable there are two Micro-Epsilon wireSENSOR WDS-P115 Digital draw-wire sensors mounted on the rails on the floor. These sensors measure the movement and the distortion of the rotor blade. The WDS-P115 Digital sensors have measuring ranges of between 5 m and 15 m and provide a digital incremental or absolute encoder output. The sensors are housed in a robust aluminium case.
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