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박미유,조흥기,이관우,유영수,조규룡,Park, Mi-You,Cho, Heung-Gi,Lee, Kowan-Woo,Yu, Young-Soo,Cho, Kyu-Lyong 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.4
According to sailing condition, an exciting force for luminairie of naval vessels was measured and analyzed. A naval combat service support boat and P${\bigcirc}{\bigcirc}$(patrol killer guided missile) were selected as a target naval vessel. Due to their small size and fast speed, they received excessive vibration than other bigger naval vessels like destroyer. The vibration of luminairie was measured on their cruising and maximum speed. This could analyze exciting force for luminairie of naval vessels. Using this analyzed data, the validity of military standard for naval vessel was verified.
박미유(Park, Mi-You),한형석(Han, Hyung-Suk),조흥기(Cho, Heung-Gi),김중길(Kim, Joong-Gil),임동빈(Im, Dong-Been),이민재(Lee, Min-Jae) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.1
유한요소해석을 통한 대상 구조물의 동특성 해석에 있어서 신뢰성 높은 실제 구조물의 동특성을 정확히 예 측하는 해석결과는 얼마나 신뢰성이 높은 유한요소모델을 수립하는가하는 문제와 직결된다고 할 수 있다. 따라서 많 은 경험과 노력을 통해 만들어진 모델을 대상으로 모달 테스팅을 통해 관심주파수대역에 걸쳐 모델을 검증하고, 이 때 얻어진 데이터를 이용, 모델을 개선하는(Model updating) 작업을 거치게 된다. 본 연구에서는 이와 같이 중량과 크기의 제한으로 인하여 충격망치나 가진기로 가진하기 어려운 함정의 고유진동수 등을 얻기 위한 모달 테스팅 방법으로써 함정의 시운전 항목 중 하나인 주포 사격시험을 이용하여 그 결과와 가능 성, 향후 진행방향에 대하여 고찰해 보았다. The accurate results of finite element analysis are directly related to reliability FE model which is exactly describing dynamic characteristics of target structure. So, a model updating is necessary to establish reliable FE(Finite Element) model with a lot of experience and effort using modal testing. A large structure is too difficult to obtain the dynamic characteristics owing to its weight and size. In this work, using main gun firing test, modal testing was performed to obtain dynamic characteristics of large naval vessel, which is difficult to tap the general modal testing method. The result of experiment was considered its possibility and future plans.
함승조원의 거주성 향상을 위한 함정 환경진동규격 분석연구
박미유(Mi-You Park),조흥기(Heung-Gi Cho),한형석(Hyung-Suk Han),이경현(Kyoung-Hyun Lee) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.10
The shipboard working environment of navy vessel is very inferior to the ground working environment. For this reason, the crew of a navy vessel suffer from an occupational disease such as lumbar pain, hearing loss, etc. Although standard for navy vessels environmental vibration is applied, the criterion of the environmental vibration is too high. So it doesnt help to improve habitability of crew. In this study, for improving its habitability of crew, the current vibration level of navy vessel was examined and the standard of navy vessels environmental vibration was investigated.
극한값으로부터의 최적화를 이용한 그루브를 통한 표변형상변형 동특성 변경법 검증
박미유(Park, Mi-You),성락훈(Sung, Rock-Hoon) 한국산학기술학회 2009 한국산학기술학회논문지 Vol.10 No.1
구조물 동특성 변경법이란 부가 구조물의 첨가나 삭제, 재료 물성치의 변경, 구조물의 형상변경 등을 이용해 구조물의 동특성을 향상시킬 수 있는 매우 효과적인 방법이다. 하지만 이러한 구조물 동특성 변경법 중 구조물의 형상 변경을 통해 그 구조물의 동특성을 향상시키는 방법은 지금까지는 주로 엔지니어의 경험이나 많은 시간을 요하는 시행착오법에 의존해 왔다. 따라서, 앞선 연구를 통해 이러한 구조물의 형상 변경을 통한 동특성변경법에 있어서 기존의 경험이나 시행착오법에 의존하는 방법이 아닌, 체계화된 방법론을 제안하게 되었으며 하드디스크 드라이브(HDD)에 성공적으로 적용하였다. 제안된 그루브를 통한 표면형상변형 동특성변경법을 검증해 보기 위하여, 본 연구에서는 모든 요소가 엠보싱 되어 있는 극한의 경우로부터 최적화를 수행하고 앞선 연구에서 얻어진 최적화 결과와 비교함으로써 제안된 방법론의 효과를 검토해 볼 수 있었으며, 1차 고유진동수를 높이기 위한 최적화 결과 그루브의 형상은 앞선 연구결과와 같음을 알 수 있었다. Structural Dynamics Modification (SDM) is a very effective technique to improve structure’s dynamic characteristics by adding or removing auxiliary structures, changing material properties and shape of structure. Among those of SDM technique, the method to change shape of structure has been mostly relied on engineer’s experience and trial-and-error process which are very time consuming. In order to develop a systematic method to change structure shape, surface grooving technique is studied and successfully applied to HDD cover model. To verify Surface Grooving Technique, fully embossed HDD cover model was optimized. And comparing with previous optimization result, the effectiveness of this surface grooving technique was checked. The shape of groove and 1st natural frequency were converged to the same result of previous optimization.
박미유(Park, Mi-You),박영진(Park, Youngjin),박윤식(Park, Youn-sik) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.3
Structural Dynamics Modification (SDM) is a very effective technique to improve structure's dynamic characteristics by adding or removing auxiliary structures, changing material properties and shape of structure. Among those of SDM technique, the method to change shape of structure has been mostly relied on engineer's experience and trial-and-error process which are very time consuming. In order to develop a systematic method to change structure shape, surface grooving technique is studied. In this work, the shape of base structure was modified to improve its dynamic characteristics such as natural frequencies via surface grooving technique. Grooving shape was formed by mergingthe neighboring small embossing elements after analyzing frequency increment sensitivities of all the neighboring emboss elements. For this process, Criterion Factor was introduced and the initial grooving was started from the element having highest strain energy and the grooving is expanded into neighboring element. The range of targeting grooving area to check its frequency variations restricted to their neighboring area to reduce the computation effort. This surface grooving technique was successfully applied to a hard disk drives (HDD) cover model to raise its natural frequency by giving some groove on its surface.
박미유(Park, Mi-You),한형석(Han, Hyung-Suk),이석수(Lee, Seuk-Soo) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.6
Main source of URN(underwater radiated noise) which is related to the ship's survivability is divided into two groups. Cavitation is the main source of URN when the speed of ship is upper than CIS(cavitation inception speed). But when the speed of ship is lower than CIS, the main source of URN is the structure-borne noise on the hull which is originated from propulsion system, pump system and trnasmitted vibration of the pipe system. In this paper, to reduce the vibration of discharge pipe and valve system, back flow prevent globe valve and new rubber mount are applied to the ship. As the result of applying new valve and mount, the vibration is reduced drastically.
박미유(Park, Mi-You),한형석(Han, Hyung-Suk),조흥기(Cho, Heung-Gi) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.7
The ship working environment of combat service support boat is much inferior to the ground working environment. For this reason, the crew of a combat service support boat suffer from an occupational disease such as hardness of hearing. Owing to its small size and low status, the improvement of its working and residential environment was occasionally ignored and its indoor noise was not fully investigated. In this study, for improving its residential environment indoor, the indoor noise of its shipboard compartments was analysed. These studies define the indoor noise level of combat service support boat is very high and some of indoor noise is exceeded the criteria for ship noise. Compared with marine police vessels, the indoor noise levels of marine police vessels are higher than the level of combat service support boat.