Water depth influence on wave–structure-interaction

Clauss, Günther F.; Stempinski, Florian; Dudek, Matthias; Klein, Marco

doi:10.1016/j.oceaneng.2009.08.020

Cited by 16 publications

(5 citation statements)

References 7 publications

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“…In these papers, the system responses were verified through simulations while the trolley trajectory did not take into account compensation for the MH motion in the control strategy. The relationships between waves and ocean structures were also the topics of intense research for other researcher (Cha et al, 2010;Clauss et al, 2009;Do and Pan, 2008;Kyoung et al, 2005;Zhu et al, 2001). In this context, Ngo et al (2011) first proposed the idea of utilizing the trolley displacement for MH motion compensation, based on a geometric analysis, to not only suppress payload oscillations but also keep the container position in a desired region.…”

Section: Introductionmentioning

confidence: 99%

Fuzzy sliding mode control of an offshore container crane

Ngo

Nguyen

et al. 2017

Ocean Engineering

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A fuzzy sliding mode control strategy for offshore container cranes is investigated in this study. The offshore operations of loading and unloading containers are performed between a mega container ship, called the mother ship, and a smaller ship, called the mobile harbor (MH), which is equipped with a container crane. The MH is used to transfer the containers, in the open sea, and deliver them to a conventional stevedoring port, thereby minimizing the port congestion and also eliminating the need of expanding outwards. The control objective during the loading and unloading process is to keep the payload in a desired tolerance in harsh conditions of the MH motion. The proposed control strategy combines a fuzzy sliding mode control law and a prediction algorithm based on Kalman filtering for the MH roll angle. Here, the sliding surface is designed to incorporate the desired trolley trajectory while suppressing the sway motion of the payload. To improve the control performance, the discontinuous gain of the sliding control is adjusted with fuzzy logic tuning schemes with respect to the sliding function and its rate of change. Chattering is further reduced by a saturation function. Simulation and experimental results are provided to verify the effectiveness of the proposed control system for offshore container cranes.

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Section: Introductionmentioning

confidence: 99%

Fuzzy sliding mode control of an offshore container crane

Ngo

Nguyen

et al. 2017

Ocean Engineering

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“…From Figure 3, the pitch RAO sensitivity to water depth shows a shift of the peak period for shallow water. This could be the effect of water depth on wave length (and wave steepness), which is also observed in [18]. Figure 4 shows that the excitation force on pitch is influenced by water depth on large wave periods due to its effect on wave steepness (shown in Figure 2).…”

Section: Parametric Sensitivity Study Water Depthmentioning

confidence: 63%

A Sensitivity Study of Vessel Hydrodynamic Model Parameters

Han

Sævik

Leira

2020

Volume 1: Offshore Technology

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In the recent decade, maritime and energy industries have realized the potential of using operational data in combination with a virtual replication of the real physical asset, termed the digital twin. The digital twin then serves as a platform for data management, asset monitoring, and inspection and maintenance management, featuring an improved basis for cost effective operations and future decision making in terms of e.g. life extension. The present paper deals with application of the digital twin concept in marine operations where it is essential to handle the inherent uncertainties of vessel performance by applying a model that can adapt to the real operating conditions. In this paper a case study is presented for identifying the most sensitive parameters in the vessel hydrodynamic model w.r.t. the vessel motion RAOs. The study also shows that the parametric sensitivity depends on the interesting vessel response parameter, wave direction and loading condition. A digital twin adaptive to various operational conditions may require parametric tuning of the numerical model. It is important to identify the correct parameter(s) for modification. A simplified and idealized case study is also carried out to test the requirements to a successful parameter identification for model tuning.

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“…In the frequency domain, Bai (1977) has also shown the dependence of the added-mass and damping coefficients on the water depth for a heaving two-dimensional rectangular cylinder. Moreover, both Clauss et al (2009) and Kim and Kim (2012) have shown the dependency of a floating body's hydrodynamic coefficients on the water depth. In this study, apart from the wave-exciting force, the heave force which results from wave radiation also varies according to the water depth.…”

Section: Wave Interaction With a Floating Surface-piercing Body In Water Of Finite Depthmentioning

confidence: 99%

“…The motion response of floating bodies in water of finite depth is a classical seakeeping topic. For example, Clauss, Stempinski, Dudek, and Klein (2009) studied the effect of water depth on the hydrodynamic coefficients of the semi-submersible crane vessel named the Thiaf. By using the radiation and diffraction code Wave Analysis @ MIT (Newman, 1977), they found that the exciting heave forces are slightly influenced by the water depth, while the added mass and potential damping show a substantial dependence on the water depth.…”

Section: Introductionmentioning

confidence: 99%

“…Significant differences in hydrodynamic properties and motion responses were also observed in shallow water compared to deep water. In most of the previous studies (Anderson, 1979;Clauss et al, 2009;Kim & Kim, 2012;Liu, Teng, Gou, & Sun, 2011;Perunovic & Jenson, 2003;Tuck, 1970), the free-surface nonlinearities as well as the nonlinear wave loads have generally been neglected, which may cause significant differences. Therefore, the present paper aims to study the wave-body interaction of a surface-piercing barge in water of various depths using fully nonlinear simulations.…”

Section: Introductionmentioning

confidence: 99%

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Wave interaction with a surface-piercing body in water of finite depth: a parametric study

Wang

Tang

2016

Engineering Applications of Computational Fluid Mechanics

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The wave-body interactions for a surface-piercing body in water of finite depth are studied using a potential-theory-based, two-dimensional, fully nonlinear numerical wave tank. A parametric study was conducted in order to investigate the effects of the non-dimensional water depth, wave steepness, wave frequency, and beam-draft ratio on the wave-exciting forces acting on a fixed surfacepiecing barge. It was found that a reduction of the water depth from deep to finite enhances all the wave-exciting forces. In all water depths, the second-order harmonics of the heave force and pitch moment are significantly large, although they can generally be neglected for the surge force. The barge was then allowed to move and the influence of the water depth on its wave forces is investigated. It was found that with the body motion involved, the surge force and the heave force reduce in the first-order harmonics while the pitch moment increases. In addition, a peak appears at finite water depth for the first-order harmonics of the heave force as well as for the heave displacement, indicating the great impact of water depth on the motions experienced by the floating barge.

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Water depth influence on wave–structure-interaction

Cited by 16 publications

References 7 publications

Fuzzy sliding mode control of an offshore container crane

Fuzzy sliding mode control of an offshore container crane

A Sensitivity Study of Vessel Hydrodynamic Model Parameters

Wave interaction with a surface-piercing body in water of finite depth: a parametric study

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