Application of the Rigid Finite Element Method for Modelling an Offshore Pedestal Crane

Krukowski, J.; Maczyński, Andrzej

doi:10.2478/meceng-2013-0028

Cited by 8 publications

(6 citation statements)

References 9 publications

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“…Today payload swaying problems attract the great attention of such applied mathematicians and mechanical engineers as Abdel-Rahman et al [1][2][3], Adamiec-Wójcik et al [4], Al-mousa et al [5], Allan and Townsend [6], Aston [7], Betsch et al [8], Blackburn et al [9,10], Blajer et al [11][12][13][14][15][16][17], Cha et al [18], Chin et al [19], Ellermann et al [20], Erneux and Kalmár-Nagy [21,22], Ghigliazza and Holmes [23], Glossiotis and Antoniadis [24], Grigorov and Mitrev [25], Gusev and Vinogradov [26], Hong and Ngo [27], Hoon et al [28], Ibrahim [29], Jerman et al [30][31][32][33], Ju et al [34], Kłosiński [35], Krukowski et al [36,37], Lenci et al [38], Leung and Kuang [39], Loveykin et al [40], Maleki et al [41], Maczynski et al [42][43][44], Marinović et al…”

Section: Introductionmentioning

confidence: 99%

3 DOF Spherical Pendulum Oscillations with a Uniform Slewing Pivot Center and a Small Angle Assumption

Perig

Stadnik

Deriglazov

et al. 2014

Shock and Vibration

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The present paper addresses the derivation of a 3 DOF mathematical model of a spherical pendulum attached to a crane boom tip for uniform slewing motion of the crane. The governing nonlinear DAE-based system for crane boom uniform slewing has been proposed, numerically solved, and experimentally verified. The proposed nonlinear and linearized models have been derived with an introduction of Cartesian coordinates. The linearized model with small angle assumption has an analytical solution. The relative and absolute payload trajectories have been derived. The amplitudes of load oscillations, which depend on computed initial conditions, have been estimated. The dependence of natural frequencies on the transport inertia forces and gravity forces has been computed. The conservative system, which contains first time derivatives of coordinates without oscillation damping, has been derived. The dynamic analogy between crane boom-driven payload swaying motion and Foucault’s pendulum motion has been grounded and outlined. For a small swaying angle, good agreement between theoretical and averaged experimental results was obtained.

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Section: Introductionmentioning

confidence: 99%

3 DOF Spherical Pendulum Oscillations with a Uniform Slewing Pivot Center and a Small Angle Assumption

Perig

Stadnik

Deriglazov

et al. 2014

Shock and Vibration

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“…However, in practice, systems are subject not only to internal deterioration but also to damage from external factors. A good example is discussed by Krukowski et al (2012) that the lifting systems working in complex environments, such as the motor of a crane for offshore lifting work, will receive overload damage caused by uncertain sea conditions. A number of researchers considered random shocks as an external factor and investigated the optimal maintenance policy for deteriorating systems subject to shocks that can cause system failure or affects system deterioration.…”

Section: Introductionmentioning

confidence: 99%

Optimal Maintenance Policy for Deteriorating Systems Subject to External Shock Damage Under a Semi-Markov Decision Process

Zirui,

Lu,

Yamamoto

2023

TQS

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Condition-based maintenance of systems that deteriorates in accordance with a semi-Markov process was investigated. In addition to considering the system deterioration state as a criterion for maintenance decisionmaking, the cumulative damage caused by random external shocks was considered as well. The occurrence of random shocks was assumed to follow a Poisson process. Furthermore, the damage from random external shocks was assumed to be affected by the system deterioration state, and the system deterioration process was assumed to be affected by the cumulative damage from random external shocks. The system operator chooses the maintenance actions (continue to operate, repair, or replace) that minimize the total expected discounted cost over an infinite time horizon at the time when the system deterioration state changes. The maintenance policy optimization problem is formulated as a semi-Markov decision process considering cumulative damage from random external shocks. The properties of the total expected discounted cost with respect to the system deterioration state and cumulative damage are proven to be monotone. A threshold-type maintenance policy is derived on the basis of the monotone properties. Numerical examples illustrate the threshold-type maintenance policy.

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“…The crane pedestal is a critical structural element of the crane due to that supports the loads and flexural moments during the crane operation. Krukowski et al [9] designed FEM models of the pedestal, the frame, and the boom of an offshore column crane to estimate the dynamic structural behavior of these components. The structural analysis of different marine structures can be studied using FEM models [10].…”

Section: Introductionmentioning

confidence: 99%

Methodology for the structural analysis of a main deck of FPSO vessel supporting an offshore crane

et al. 2022

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Offshore cranes placed on the surface of Floating Production Storage and Offloading (FPSO) vessels affect the structural response of their main decks, which can alter the safe operation of the FPSO vessels. Generally, classification societies rules are used to predict the structural strength of the main deck of FPSO vessels. However, these classification societies rules are limited to estimate the variation of the structural performance of the main deck caused by the operation of offshore cranes under different hydrodynamic conditions. Here, we present a methodology to determine the alteration of the structural behavior of a main deck of FPSO vessel due to different operation conditions of a board offshore crane. This methodology considers the hydrodynamic response for two ultimate limit states: operating and storm conditions from 1000 m water depth in Gulf of Mexico with a return period of 10 and 100 years, respectively. The methodology includes finite element method (FEM) models of the main deck supporting an offshore crane to predict its structural response. The maximum von Mises stress of the main deck does not overcome its maximum permissible stress, which allows a safe operation of the FPSO crane. The proposed methodology can be used to estimate the structural behavior of main decks of FPSO vessels that are modified for supporting offshore cranes, regarding the hydrodynamic response for each FPSO under the operation and extreme conditions in its location. Thus, naval designers could select the better structural modifications of the main decks that decrease their costs of construction and maintenance.

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Application of the Rigid Finite Element Method for Modelling an Offshore Pedestal Crane

Cited by 8 publications

References 9 publications

3 DOF Spherical Pendulum Oscillations with a Uniform Slewing Pivot Center and a Small Angle Assumption

3 DOF Spherical Pendulum Oscillations with a Uniform Slewing Pivot Center and a Small Angle Assumption

Optimal Maintenance Policy for Deteriorating Systems Subject to External Shock Damage Under a Semi-Markov Decision Process

Methodology for the structural analysis of a main deck of FPSO vessel supporting an offshore crane

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