• 제목/요약/키워드: Dolphin mooring systems

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불규칙파 중에서 돌핀 계류된 해상공항에 대한 운동 해석 (Motion Analyses for a Very Large Floating Structure with Dolphin Mooring Systems in Irregular Waves)

  • 이호영;신현경;임춘규;강점문;윤명철
    • 한국해양공학회:학술대회논문집
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    • 한국해양공학회 2000년도 추계학술대회 논문집
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    • pp.57-62
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    • 2000
  • The very large flcating structure which am be used for as airport may be as large as several kilomet wide. The first order wave forces as well as wave drift forces are very important forces on such a very large floating In the present studv, the time simulation of motion responses with dolphin-moored VLFS in waves is presented The coeffcients and wave forces involved in the equations are obtained from a three-dimensionul panel method in the frequc The horizontal drift forces and mooring forces for dolphin systems are taken into account. As for numerical example, analyses are carried out for a VLFS in irregular wave condition

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불규칙파 중에서 돌핀 계류된 바아지식 해상공장에 대한 비선형 응답 해석 (Nonlinear Response Analyses for a Barge-Mounted Plant with Dolphin Mooring Systems in Irregular Waves)

  • 이호영;신현경;염재선
    • 한국해양공학회지
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    • 제14권4호
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    • pp.1-8
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    • 2000
  • The time simulation of motion responses of dolphin-moored BMP in waves is presented. The equation of motion based on Cummin's theory of impulse responses are employed, and solved in time domain by using the Newmark $\beta$ method. The hydrodynamic coefficient and first order wave exciting forces involved in the equations are obtained from a three-dimensional panel method in the frequency domain. The second order wave drift forces and mooring for dolphin system are taken into account. As for numerical example, time domain analysis are carried out for a BMP in irregular wave condition.

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지반의 강성특성을 고려한 지반-돌핀구조계의 동적해석 (Dynamic Analysis of Mooring Dolphin System Considering Soil Properties)

  • 이진학;오세붕;윤정방;홍섭;김진하
    • 한국해양공학회지
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    • 제12권3호통권29호
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    • pp.19-30
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    • 1998
  • In this paper, the dynamic analysis of a dolphin system for mooring a floating structure such as barge mounted plant is studied. The characteristics of the soil-pile system are simplified by a set of equivalent spring elements at the mudline. To evaluate the equivalent spring constants, the finite difference method is used. Since the characteristics of the soil-pile system are nonlinear in case of soft foundation, the nonlinear dynamic analysis technique is needed. The Newmark $beta$ method incorporating the modified Newton-Raphson method(initial stiffness method) is used. A numerical analysis is performed on two mooring dolphin systems on soft foundation and rock foundation. In case of the rock foundation, the characteristics are found to be nearly linear, so the linear dynamic analysis may be sufficient to consider the foundation effect. But in case of soft foundation, the non-linearity of the foundation appears to be very signigicant, so the nonlinear dynamic analysis si needed.

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선박의 충돌로 인한 해양구조물의 거동 해석 (Analyses on the Behaviour of Ocean Structure Due to Ship Collision)

  • 이호영;박종환;곽영기
    • 한국해양공학회지
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    • 제15권4호
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    • pp.115-119
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    • 2001
  • The simulation of motion responses of a dolphin-moored ocean structure in shallow water when it cllides with a ship, has been carried out. The equation of motion in the time domain according to Cummin's theory is employed, and solved by making use of the Newmark-${\beta}$ method. The added mass and damping coefficients involved in the equations are abtained from a three-dimensional panel method in the frequency domain. The impact forces due to ship collision are calculated using both the elastic and non-elastic modelings. The mooring forces for dolphin systems of ocean structure are regarded as linear spring forces.

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선박의 충돌로 인한 해양구조물의 거동 해석 (Behaviour Analyses of Ocean Structure Due to Ship Collision)

  • 이호영
    • 한국해양공학회:학술대회논문집
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    • 한국해양공학회 2001년도 춘계학술대회 논문집
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    • pp.103-107
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    • 2001
  • When ship claps against the ocean structure sited at shallow water, the time simulation of motion responses of dolphin-moored ocean structure is presented. The equatien of motion based on Cummin's theory of impulse responses are employed, and solved in time domain by using the Newmark $\beta$ method. The added mass and damping coefficients involved in the equations are obtained from a three-dimensional panel method in the frequency domain. The impact forces due to ship collision are modeled as two method, and those are elastic and non-elastic collisions. The mooring forces for dolphin systems of scean structure are considered as linear spring system.

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불규칙파 중에서 돌핀 계류된 해상공항에 대한 운동 (Motion Analyses for a Very Large Floating Structure with Dolphin Mooring Systems in Irregular Waves)

  • 이호영;신현경;임춘규;김외현;강점문;윤명철
    • 대한조선학회논문집
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    • 제38권2호
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    • pp.10-18
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    • 2001
  • 초대형 해상 공항은 길이나 폭이 수 킬로미터인 거대 구조물이며, 해상에 계류된 해상공항의 설계에 있어 파도에 의한 1차항 파강제력과 2차항 파강제력은 반드시 고려하여야 한다. 본 논문에서 파중에서 돌핀계류된 해상공항에 대한 운동응답의 시간영역해석이 제시된다. 운동방정식에서 동유체력 계수와 파도에 의한 힘은 주파수 영역의 3차원 패널 방법으로부터 계산되며, 동시에 돌핀계류계에 대한 계류력과 수평방향의 표류력이 본 계산에서 얻어진다. 본 논문의 계산 예로 일본에서 실증실험을 수행한 phase I 해상공항에 대해 불규칙파 중에서 시간영역 해석이 제시된다.

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