Experimental Setup DTC, Deep Water Sample Clauses

Experimental Setup DTC, Deep Water. For the added resistance tests in deep water at MARINTEK, the DTC model was captive in a soft-mooring arrangement as visualized in Figure 32. Lightweight lines were used and the spring stiffness has been chosen such that the eigenfrequency of the mooring in the relevant direction is less than 1/6th of the lowest wave encounter frequency. A supplementary set of force transducers was installed in the aft and fore joints of the lines to ensure consistency in the measurements. For the drift force tests in deep water, the DTC model was captive in a soft-mooring arrangement as visualized in Figure 32 and held at position/towed by the gondola at constant speed. Light weight lines were used and the spring stiffness has been chosen such that the eigenfrequency of the mooring in the relevant direction is less than 1/6th of the lowest wave encounter frequency. At the same time, the aim was to minimize the yaw drift angle (it was kept within ±2°). A transverse beam was mounted to the gondola and the lines were deflected by low friction pulleys to align and attach the springs vertically. Force transducers were mounted forward of the bow and behind the xxxxx at CL and KG. A supplementary set of force transducers was installed in the lines to ensure consistency in the measurements. The model was fitted with segmented bilge xxxxx, xxxxxx (fixed at 0° rudder angle) and rudder box during this set of tests. All wave environments have been measured without the presence of the model for reference. For drift force tests, the gauge was located at the model position and for added resistance in a representative location between starting position and wave maker. Figure 32: DTC model in soft-mooring arrangement for added resistance (top) and drift force tests (bottom) at MARINTEK (left: schematic sketches, right: impressions from model tests)