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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.
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.