Time Domain Analysis for DP Simulations

Serraris, Jorrit‐Jan

doi:10.1115/omae2009-79587

Cited by 25 publications

(9 citation statements)

References 4 publications

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“…Ormberg and Bachynski (2012) described the RIFLEX extension of aerodynamic load on elastic structural components. Also, aNySIM has been developed and validated by MARIN to provide clients with a more integrated simulation package including multi-body side-by-side, the mooring system and dynamic positioning capability studies (De Wilde et al 2009;Naciri et al 2007;Serraris 2009). Another integrated code DARwind has been proposed by Chen et al (2019).…”

Section: Time Domain Analysismentioning

confidence: 99%

Review of Experimental-Numerical Methodologies and Challenges for Floating Offshore Wind Turbines

Chen

2020

J. Marine. Sci. Appl.

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Due to the dissimilar scaling issues, the conventional experimental method of FOWTs can hardly be used directly to validate the full-scale global dynamic responses accurately. Therefore, it is of absolute necessity to find a more accurate, economic and efficient approach, which can be utilized to predict the full-scale global dynamic responses of FOWTs. In this paper, a literature review of experimental-numerical methodologies and challenges for FOWTs is made. Several key challenges in the conventional basin experiment issues are discussed, including scaling issues; coupling effects between aero-hydro and structural dynamic responses; blade pitch control strategies; experimental facilities and calibration methods. Several basin experiments, industrial projects and numerical codes are summarized to demonstrate the progress of hybrid experimental methods. Besides, time delay in hardware-in-the-loop challenges is concluded to emphasize their significant role in real-time hybrid approaches. It is of great use to comprehend these methodologies and challenges, which can help some future researchers to make a footstone for proposing a more efficient and functional hybrid basin experimental and numerical method.

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Section: Time Domain Analysismentioning

confidence: 99%

Review of Experimental-Numerical Methodologies and Challenges for Floating Offshore Wind Turbines

Chen

2020

J. Marine. Sci. Appl.

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“…Tuning of the controllers is important to ensure stable vessel behaviour. A first estimate of the proportional, integral and derivative gains of the high-level DP controller τ DP is obtained by the rules of thumb proposed by Serraris [19].…”

Section: Controller Tuningmentioning

confidence: 99%

“…The station keeping performance of the control model is compared to a conventional DP control system to analyze the effect of active roll reduction onto the DP footprint. The conventional DP system consists of a Kalman filter, PID controller and an allocation algorithm [19]. The coefficients of the Kalman filter and the PID controller of the conventional DP system are kept the same as in our proposed roll reduction control model to ensure equal comparison.…”

Section: Dp Modelmentioning

confidence: 99%

A control strategy for combined DP station keeping and active roll reduction

Jong

Vos

Beindorff

et al. 2020

ISP

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Dynamic positioning (DP) systems are used for station keeping during offshore operations. The safety and operability of several offshore operations can be increased when the roll motion is actively controlled, especially in beam seas. We propose a novel control strategy for combined roll motion control and station keeping, using no additional hardware than the installed DP thrusters. The control strategy is applied to an offshore construction vessel and the performance is demonstrated by time domain simulations. The DP footprint is compared to a conventional dynamic positioning control model. The proposed control model enables active roll reduction while the station keeping performance remains unaffected. The code has been made open source and is available on https://github.com/pwellens/3dp.git.

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“…The main components of the DP system are briefly described below. More detailed explanations can be found in [1], [2] and [3].…”

Section: Components In a Dp Systemmentioning

confidence: 99%

A Generic Optimization Algorithm for the Allocation of DP Actuators

Daalen

Cozijn

Loussouarn

et al. 2011

Volume 1: Offshore Technology; Polar and Arctic Sciences and Technology

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In this paper we present a generic optimization algorithm for the allocation of dynamic positioning actuators, such as azimuthing thrusters and fixed thrusters. The algorithm is based on the well-known Lagrange multipliers method. In the present approach the Lagrangian functional represents not only the cost function (the total power delivered by all actuators), but also all constraints related to thruster saturation and forbidden zones for azimuthing thrusters.In the presented approach the application of the Lagrange multipliers method leads to a nonlinear set of equations, because an exact expression for the total power is applied and the actuator limitations are accounted for in an implicit manner, by means of nonlinear constraints. It is solved iteratively with the Newton-Raphson method and a step by step implementation of the constraints related to the actuator limitations.In addition, the results from the non-linear solution method were compared with the results from a simplified set of linear equations, based on an approximate (quadratic) expression for the thruster power. The non-linear solution was more accurate, while requiring only a slightly higher computational effort.An example is shown for a thruster configuration with 8 azimuthing thrusters, typical for a DP semi-submersible. The results show that the optimization algorithm is very stable and efficient.Finally, some options for improvements and future enhancements -such as including thruster-thruster and thrusterhull interactions and the effects of current -are discussed.

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Time Domain Analysis for DP Simulations

Cited by 25 publications

References 4 publications

Review of Experimental-Numerical Methodologies and Challenges for Floating Offshore Wind Turbines

Review of Experimental-Numerical Methodologies and Challenges for Floating Offshore Wind Turbines

A control strategy for combined DP station keeping and active roll reduction

A Generic Optimization Algorithm for the Allocation of DP Actuators

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