실습선 가야호의 선체진동에 대한 승선환경

Abstract

To compare and evaluate the suitability and comfort levels of the environment on board a stern trawl training ship, KAYA (GT: 1737 tons, Pukyong National University), with the international standardization guide ISO 6954:2000(E), measurements of the hull vibration on accommodation areas and working areas of the training ship from July 8 to July 10, 2008 were completed upon KAYA’s linear sea route. The vibrations along the z-axis were measured with the use of a 3-axis vibration level meter, which included a marine vibration card. Results show accelerations of the vibrations on the passenger's accommodation area to be 42.0-115.8 (average: 78.0, standard deviation (SD): 21.0) mm/s2, which is largely below the permissible upper limit, but 75 % of the observation points exceeded the permissible lower limit of 71.5 mm/s2, indicating a comfortable environment. The accelerations of the vibration in a frequency of 10-24Hz lowering the visual performance were measured at 2.5-12.0 (average: 7.6, SD: 3.1) mm/s2. The crew's accommodation area experienced vibration accelerations of 42.9-82.3 (average: 93.1, SD: 53.1) mm/s2, which is generally below the permissible upper limit of 214.0 mm/s2, and 62.5% of the observation points did not exceed the permissible lower limit of 107.0 mm/s2 , denoting a level of comfort. The acceleration of the vibration in a frequency of 10-24Hz were 4.7-28.3 (average: 12.4, SD: 8.8) mm/s2. On the crew's working area the accelerations were measured at 86.9-153.9 (average= 119.3, SD= 18.0) mm/s2. These values were generally below the permissible upper limit of 286.0 mm/s2 and only 12.5% of the observation points did not exceed the permissible lower limit of 143.0 mm/s2, the level at which a high level of comfort is maintained. The accelerations in frequency of 10-24Hz and 30Hz were 9.1-29.8 (average=13.8, SD= 4.5) mm/s2 and 8.9-13.7 (average= 11.8, SD= 2.1) mm/s2, respectively. In conclusion the boarding environment of the training ship was good in general although an improvement of the vibration condition partially needed on the crew’s accommodation area near the engine room.