Project objective

Review existing nacelle test benches and their boundary conditions. The review will include the range of loads that can be applied and the dimensions of the test bench, as well as existing methods of torque measurement and calibration and the levels of uncertainty achieved. (WP1) Develop novel traceable calibration methods for torque values in nacelle test benches in the form of transfer standards for the range above 1 MN m. In order to enable the multi-use of transfer standards a unified approach for several nacelle test benches will be applied. Two different approaches will be used in the project: a commercial torque transducer will be used with an extrapolation procedure for the MNm range (WP2) and a force lever system will be designed to directly reach the MNm range (WP4). Investigate the effect of multi-component loading on the measurement of torque. In particular, cross-talk effects, in the case of 6-component loading (3 directional forces, 2 directional bending, torque), will be studied to describe effects on the torque measurements which occur in large nacelle test benches. (WP3) Develop a calibration procedure for large nacelle test benches. The calibration procedure will enable the traceability of torque loads up to 20 MN m and will include an uncertainty model that considers cross-talk effects. (WP5)

Expected outcome

Novel Calibration Procedure for Nacelle Test Benches