The paper is largely based on analysis of a series of experiments by Koushan (2006 I and II), where an azimuth thruster with open propeller is tested in conditions with intermittent ventilation. The use of a 6-component blade dynamometer on one of the four propeller blades gives detailed insight...
This paper presents experimental results of the forces and moments acting on a single propeller blade running in ventilated conditions in calm water and in waves. A model of a Rolls-Royce Azipull thruster with a four-blade propeller was tested with provisions to measure three orthogonal moments...
Feed requirements were estimated from specific growth rates in standardized soft tissue dry weight (SGRDW’) and atomic O:N ratios for mussels fed seven rations of microalgae (5–735 μg C h−1 ind−1) at 7 and 14°C respectively. The mean oxygen consumption and ammonia-N excretion rates were...
The floating storage unit Navion Saga at the Volve field in the North Sea suffered from two mooring line breaks in steel wire ropes in 2011. Investigations of the broken ropes indicated that a possible failure mechanism could be high stresses near the wire socket induced by large bending moments in...
When operating with a moonpool, a main concern is the large-amplitude piston-mode motion at resonance. This limits the time-window for operations inside the moonpool. Longer time-windows are desired. Further, the moonpool size is expected to increase for dedicated vessels. There has therefore...
INTRODUCTION: Passive drag can be measured by towing swimmers passively through the water. This requires expensive and often inaccessible equipment and can be a time consuming process. The velocity decay test has previously been used as an indirect method for estimating passive drag (Kjendlie...