Fig. 6 Lowest transversal mode in air (left). Measuring points 8 and 9 are on two propeller blades. Point 10 is on the bottom of the ship hull Calibration measurements by static forces The azimuthing thruster was instrumented by several strain gages and other measuring devices for long-term ice load monitoring. The ice load measuring system was calibrated by applying external static forces on the propulsion unit in dry dock. The applied forces were measured by load cells. Radial relative displacement between the thruster body and the ship hull was also measured during calibrations with two inductive displacement sensors, see figure Fig. 7. These measurements provided information about flexibility of slewing bearing as well as thruster body for verification of the used FE-model. Fig. 7 Calibration of ice load measuring system in transversal direction 9
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