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Kuk-Su Kim(김극수),Nho-Seong Kim(김노성),Wook-Rhee(이욱),Dong-Hee Kwak(곽동희) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.10
In cruise ships, it is inevitable to arrange the cabins near by the noisy areas, such as ventilation fan, HVAC machinery and funnel casing etc. The noise is propagated to the cabins by way of mount, foundation and deck. The transmitted noise to cabin is affected by mount and foundation structure. It is well-known that most of the structure-borne noise can be reduced by the flexible mount. However, when the foundation of machinery is designed inappropriately, it can make noise problems in cabins. In this paper, the effect of foundation on noise reduction is studied through the numerical analysis and mock up test. The dynamic performance of foundation is investigated from the viewpoint of the impedance and noise reduction in cabin.
A Study on Fatigue Assessment of the Crane Post due to Vibration during the Emergency Stop
김극수(Kuk Su Kim),김노성(Nho Seong Kim) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4
선박에 설치된 크레인은 일반적으로 기둥의 높이가 높고 상대적으로 가는 진동에 취약한 장비이다. 선박 크래인 운전중 비상사태가 발생하여 브레이크를 사용하면 갑작스러운 충격하중에 의해 크레인 포스트에 과도한 진동이 발생하기도 한다. 이러한 진동에 의한 크레인의 안전성을 평가하는 것이 본 연구의 목적이다. 본 연구에서는 크레인의 비상정지시 발생하는 충격력을 추정하고 이러한 충격력을 이용하여 크레인에서의 응답과 스트레스에 의한 피로수명을 예측하였다. The tall and slender main crane is generally installed on the upper deck to load and unload the equipment or something heavy in the drilling rig or the ship. So the natural frequency of the crane equipment is very low, therefore, there is some possibility of excessive vibration at the emergency state due to sudden stop during the crane operation. This study describes a fatigue assessment due to heavy vibration during br ake test of sudden stop because it is necessary the safety of crane is estimated against the heavy vibrat ion. In order to find out the applied force, the vibration measurement and analysis have been performed.