FULL-SCALE MEASUREMENTS ON BOARD PSRV S.A. AGULHAS Ⅱ IN THE BALTIC SEA

摘要

The presence of rich natural resources in Arctic waters continuously raises interest in marine operations in ice. Despite the availability of several full-scale measurements in ice-infested waters, knowledge of the impact of ice-structure interaction on the ship's hull and propulsion system as well as on the comfort of the crew and passengers on board is limited. This can be attributed to: (1) the fact that the effects of ice loading on the ship hull has not yet been related to prevailing ice conditions, (2) ice loading and the related response of the propulsion system is an almost unknown process and (3) vibration levels resulting from ship-ice interaction are not known. To increase the knowledge in these fields, full-scale measurements were conducted on the PSRV S.A. Agulhas Ⅱ in the Baltic Sea during March 2012. Measurements on the following were obtained: (1) ice loads on the ship hull and propulsion system, (2) ice-induced structural vibration and noise, (3) whole-body vibration comfort, (4) ship dynamics in ice, (5) global ice loads, (6) underwater noise and (7) mechanical and physical sea ice properties. Furthermore, the effect of ship operations on the loads induced by ice on the ship hull was studied during a variety of ship manoeuvres. This paper focuses on selected aspects of the conducted full-scale measurements, including: (1) the ice loading on the ship hull and propulsion system, (2) human comfort on board (3) mechanical ice property measurements, (4) the effect of ship operations on the maximum ice loads on different hull areas, (5) the natural frequencies and damping effects of the propeller shaft and (6) the possibility of the resonance of the propeller shaft's due to the sequential propeller blade impacts with ice.