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사격 폭발음의 잔향음이 포 사격장의 구조안정도에 미치는 영향 분석
한형석(HyungSuk Han),이경현(KyoungHyun Lee),박성호(SungHo Park),전수홍(SooHong Jeon) 한국소음진동공학회 2017 한국소음진동공학회 논문집 Vol.27 No.4
Since the shooting blast sound in the military shooting range is extremely high, it can make a damage to the surrounding structure. Therefore, in the design state of the construction of the military shooting range, the building and structure should be arranged considering the induced sound pressure from the gun. In the typical military shooting range surrounding to test buildings described in this research, the measured impact sound level of the gun firing is higher than the design limit. Therefore, the root cause of this sound incresing is investigated in this research. The sound field characteristics in the military shooting range is experimently evaluated using signal gun. Using Palmgren Miner’s cumulative damage calculation method, the effect of the direct impact sound and reverberation sound for the building structure in the shooting range are investigated related to the endurance characteristics.
샌드위치 패널을 이용한 함정탑재장비용 방진 베이스 개발
한형석(HyungSuk Han),이경현(KyoungHyun Lee),박성호(SungHo Park),위양현(YangHyun Wi) 한국소음진동공학회 2016 한국소음진동공학회 논문집 Vol.26 No.4
The underwater radiated noise can be reduced by decreasing the structure borne noise of the onboard equipment. Therefore, the structure borne noise of the onborad installed equipment is strongly restricted by ROK navy with MIL-Std 740-2. Usually, the vibration transmissibility from the equipment to the hull of the ship is dependent on its mount characteristics. Even though the double mount structure is proper to apply for ship board application rather than single mount, it is not widely applied due to the weight and volume resriction of the ship. Therefore, in this research, the base using sandwitch panel which can act as double mount structure is suggested and its noise reduction capacity is verified with analytic calculation as well as experiment.
한형석(HyungSuk Han),이경현(KyoungHyun Lee),박성호(SungHo Park) 한국소음진동공학회 2015 한국소음진동공학회 논문집 Vol.25 No.6
In order to reduce the structure borne noise of the equipment sufficiently, its exciting force should be restricted and additional anti-vibration devices such as resilient mount and bellows should be applied. Since the structure borne noise is dependent on the design of the base for the equipment, it is very important to design the base with low vibration. Therefore, in this research, various types of the base design for the shipboard equipment are investigated to reduce the structure borne noise. In order to design the base with low vibration, the exciting force at the center of the gravity of the equipment is firstly defined through the experiment. Using the exciting force identified by experiments, various types of base designs for the typical turbo machine are evaluated by FEM(finite element method) analysis.