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대형 컨테이너 선박의 유탄성 실선 계측 데이터 분석 Part I - 모달 파라미터 추정
김병훈,최병기,박준석,박성건,기혁근,김유일,Kim, Byounghoon,Choi, Byungki,Park, Junseok,Park, Sunggun,Ki, Hyeokgeun,Kim, Yooil 대한조선학회 2018 大韓造船學會 論文集 Vol.55 No.1
To understand the dynamic characteristics of the vessel with hydroelastic response, it is very important to estimate the dynamic modal parameters such as mode shapes, natural frequency, and damping ratio. These dynamic modal parameters of full scale ship are a priori unknowns, hence to be estimated directly based upon the full scale measurement data. In this paper, dynamic modal parameters were extracted by signal processing of acceleration and strain data measured from a large container ship whose loading capacity is 9400TEU. The mode shapes of the vibrating hull were identified using the proper orthogonal decomposition and the vibration response of hull was decomposed into its modal magnitudes. Natural frequencies of specific modes were derived via Fourier transform of these modal magnitude. Also, the free decay signal of the vibrating hull was obtained through the random decrement technique and the damping ratio was estimated with accuracy.
대형 컨테이너 선박의 유탄성 실선 계측 데이터 분석 Part II - 피로 손상도 추정
김병훈,최병기,박준석,박성건,기혁근,김유일,Kim, Byounghoon,Choi, Byungki,Park, Junseok,Park, Sunggun,Ki, Hyeokgeun,Kim, Yooil 대한조선학회 2018 大韓造船學會 論文集 Vol.55 No.1
Concerns are emerging in marine industry on the additional fatigue damages induced by hydroelasticity, and large container carriers, among others, are considered to be susceptible to this hydroelastic response due to its large size, deck openings and high speed. This study focuses on the fatigue damage estimation of 9,400TEU container carrier based on the full scale measurement data via long-base strain gage installed on the ship. Some correlation analyses have been also done to check whether there was significant torsional response during the voyage. Direct cycle counting method was used to derive stress histogram and the long-term fatigue damage was estimated based upon that analyzed data. It turned out that the fatigue damage of this particular ship during the measurement period increased by more than 60% due to the hydroelastic response of the hull, and main contribution is considered to come from vertical bending mode.
종단간 끊김없는 연결과 TCP 성능의 향상을 위한 무선 홈네트워크 플랫폼에 관한 연구
김병훈(Byounghoon Kim),탁성우(Sungwoo Tak) 한국멀티미디어학회 2007 멀티미디어학회논문지 Vol.10 No.10
인프라스트럭처 모드 기반의 무선랜(Wireless Local Area Networks)을 사용하는 무선 홈네트워크에서는 모든 무선 단말간의 통신이 액세스포인트를 통하여 이루어진다. 따라서 무선 단말이 음영 지역(Dead Zone)으로 이동하면 이동한 무선 단말과 액세스포인트간의 통신이 불가능하여 끊김없는 연결(Seamless Connection)을 제공하지 못하는 문제점이 있다. 기존의 무선 홈네트워크 플랫폼에서는 이러한 문제를 해결하기 위하여 애드 혹 모드로 동작하는 무선 홈네트워크 구조에 대하여 연구하고 있지만, 애드 혹 모드 기반의 무선랜은 인프라스트럭처 모드 기반 무선랜에 비하여 네트워크 용량이 제한되는 문제가 있다. 그리고 무선 단말의 이동성을 지원하기 위해서는 애드 혹 라우팅 기법이 필요하다. 그러나 기존의 AODV 및 DSR 라우팅 기법은 무선 채널 정보를 참조하지 않고 네트워크 계층에서 독립적으로 라우팅을 수행하기 때문에 무선 채널의 상황에 빠르게 대처할 수 없어 끊김없는 연결을 제공할 수 없다. 이에 본 논문에서는 종단간 끊김없는 데이터 전송을 보장하기 위한 ESCOD(End-to-end Seamless multi-hop COnnection based on Dual network mode) 기반의 무선 홈네트워크 플랫폼과 VLR(Virtual Link Routing) 기법을 제안하였다. 구현된 시스템의 성능을 평가한 결과, VLR을 탑재한 ESCOD 기반의 무선 홈네트워크 플랫폼은 기존의 AODV 및 DSR 라우팅 보다 낮은 패킷 전송의 실패율과 빠른 패킷의 평균 전송시간을 제공함과 동시에 기존 인프라스트럭처 모드만을 제공하는 무선 홈네트워크 플랫폼보다 넓은 통신 범위와 향상된 TCP 성능을 확인하였다. A wireless access point is used for all communications in the infrastructure mode wireless home net working, including communication between mobile nodes in the same service area. When a mobile station in the infrastructure mode wireless home networking moves into a dead zone, the communication between the mobile station and the access point is disconnected. To solve this problem, the existing wireless home network platforms focus on the ad hoc mode wireless home networking. However, the performance of an ad hoc network is poorly decreased when the number of mobile participating in the ad hoc network increases. In addition, although the ad hoc routing technique is necessary to support seamless communication of mobile nodes, the existing routing protocols, such as AODV and DSR, do not consider that a wireless channel state could affect performance significantly. Therefore, we propose a wireless home networking platform based on the ESCOD (End-to-end Seamless multi-hop COnnection based on Dual network mode) technique incorporating the VLR (Virtual Link Routing) scheme that supports end-to-end seamless connections. Extensive experiments show that the proposed wireless home networking platform incorporating the VLR scheme outperforms wireless home networking platforms based on the AODV and the DSR routing protocols respectively in terms of low packet transmission failure rate, fast packet transmission time, high TCP performance, and a wider coverage area of wireless home networks.
실험계획법을 이용한 Steering Vibration 최적설계
김병훈(Byounghoon Kim),권우성(Woosung Kwon),신인섭(Inseob Shin),한우섭(Woosub Han),박광서(Kwangseo Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The Steering vibration is one of the major contributors to the perceived quality in a vehicle. Especially, the steering vibration is the important role at the idle status. So it has a lot of effort to improve the steering vibration. The Steering vibration is related to the steering column, IP Structure and BIW (body in white) structure. In this paper, Design parameters are limited to IP Structure and BIW (body in white) structure and we will find important optimization design parameters among many design parameters through DOE and Kriging method. Also, we will find the optimized shape through the shape optimization analysis to improve the steering vibration and minimize the mass increase.