Thrusters modelling for escort Tug capability predictions

Mauro, Francesco

doi:10.1016/j.oceaneng.2021.108967

Cited by 4 publications

(2 citation statements)

References 11 publications

(17 reference statements)

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“…For the investigated cases, system (1) presents more unknowns than equations, thus, its solution requires the application of a dedicated algorithm. Among the multiple solutions developed by the authors [16,17,18], here, the thrust allocation solver, used for DP calculations, is based on a genetic algorithm capable to determine automatically the thrusterthruster interaction areas [19].…”

Section: Installation Overviewmentioning

confidence: 99%

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2022

brod

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Installation of jacket platforms requires simultaneous and combined operations of multiple assets. When the whole process has to be planned, it is necessary to predict in a fast and reliable way the possible weather limitations that may occur during the operations. The paper will present the major challenges of this unusual and innovative Dynamic Positioning analysis which has been carried out for Ana Jacket installation. The obtained results show that the Dynamic Positioning system of the core vessel in intact configuration is capable to hold the position for the investigated vessels' arrangements and design operative weather conditions. Lifting, upending and installation of Ana Jacket were carried out successfully in 2021.

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Section: Installation Overviewmentioning

confidence: 99%

Untitled

2022

brod

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“…The robust nonlinear dynamic positioning control design in the paper [24] takes into account the dynamics of the thruster system, causing the control action produced by the control signal acting on the thruster to change gradually without sudden changes, as required by engineering reality. There are also some papers that use a thrust allocation algorithm in dynamic positioning prediction, and they also have good results [42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Ship Dynamic Positioning Output Feedback Control with Position Constraint Considering Thruster System Dynamics

Feng

Wang

et al. 2023

JMSE

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In order to simultaneously address the issues of ship operating area limitation, unknown time-varying disturbances, immeasurable ship speed, unknown dynamics, and input saturation, this paper investigates the position-constrained ship dynamic positioning output feedback control, taking thruster system dynamics into account. Firstly, a barrier Lyapunov function (BLF) is utilized to limit the ship position inside the dynamic positioning system’s acceptable working range and to limit the ship position error. Second, the set total disturbance, which is made up of unknown time-varying disturbances and unknown dynamics and is further handled by the control strategy, is estimated using a fixed-time extended state observer (FDESO). Additionally, the thruster system dynamics equations are incorporated into the controller design process so that the generated thrust signal varies gradually without abrupt fluctuations, in keeping with engineering realities. Furthermore, the thruster input saturation issue is dealt with using a finite-time auxiliary dynamic system. Finally, a robust control term is introduced to handle the errors generated in the controller design. The stability proof section demonstrates that the designed control strategy can cause the ship to arrive and maintain at the desired location and heading, as well as stay continuously inside the designated operating area with all signals of the closed-loop control system being consistently and eventually bounded. The simulation results demonstrate that the proposed system is valid.

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A flexible method for the initial prediction of tugs escort capability

Mauro

2022

Ocean Engineering

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Thrusters modelling for escort Tug capability predictions

Cited by 4 publications

References 11 publications

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Ship Dynamic Positioning Output Feedback Control with Position Constraint Considering Thruster System Dynamics

A flexible method for the initial prediction of tugs escort capability

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