Displacement measurement on wind turbine rotor testers

Test rigs are developed for performing load testing on wind turbine rotor blades to simulate real loads caused by high winds and storms. During this process, rotor blades up to 70m in length are tested, as per a new rig test developed by the Fraunhofer Institute IWES in Bremerhaven. Due to mechanical loads experienced during the test, the rotor blades are subject to distortion by up to 10m. Because of this, the rotor blade is mounted horizontally in the test rig.

To measure these distortions, draw-wire sensors by Bestech Australia are used. This measurement system uses two sensors per traction point to measure the deflection and torsion of the rotor blade. The robust aluminium housing and simple handling led by these sensors make them the ideal choice for this application. The sensors have a measuring range between between 3m and 10m and can be configured to provide digital signal outputs for further simulations.