188 J. Baqersad et al. Fig. 19.1 A photograph of the test set-up showing the wind turbine attached to the steel-block (the accelerometers are mounted toBlade 3) Blade 1 Blade 3 Blade 2 1 2 3 5 8 9 10 11 12 7 6 4 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 30 29 32 31 33 34 36 35 37 38 39 40 Fig. 19.2 A drawing of the test set-up showing the sensor locations separate set-ups; however, this requires extra consideration to mass loading which is discussed further. For the first set-up, all the accelerometers were installed on Blade 1. The response of the turbine to the excitations was measured by using 12 triaxial accelerometers mounted to Blade 1 (36 channels). Then, the accelerometers were moved to Blade 2 and the response of the structure was measured. Next, the accelerometers were moved to Blade 3 and same measurements were repeated. The final set of measurement was performed when four of the triaxial accelerometers were attached to the support block and the turbine was exited by using impact hammers or shakers. To compensate for the mass of the accelerometers, dummy masses were installed to emulate the weight of the accelerometers and connected wires. When the accelerometers are mounted to one blade, a set of dummy masses were used
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