Simulation and experimental study on control strategy of zero-speed fin stabilizer based on disturbance and compensation

Liang, Lihua; Zhao, Peng; Zhang, Songtao; Ji, Ming; Song, Jian; Yuan, Jia

doi:10.1371/journal.pone.0204446

Cited by 8 publications

(6 citation statements)

References 16 publications

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“…A certain mass of fluid is accelerated or decelerated when the fin is flapped up and downwards, and gives a force to the fin due to their inertia. The force is called as added inertia force and can be calculated as [27]: Where ka is coefficient related to the fin angular velocity, is the fin angular acceleration.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…As shown in Fig 5, the reduce-scaled ship model is equipped with two pairs of parallelogram fin stabilizers. As mentioned in Section 2, the hydrodynamic force generated on a fin using “paddle” mode mainly consists of the pressure drag, vortex drag and added mass force [14, 19, 20, 27]. The pressure drag and vortex drag are proportional to the square of the fin angular velocity, and the added mass force is proportional to the fin angular acceleration [22, 28–30].…”

Section: System Descriptionmentioning

confidence: 99%

“…Su et al used the fuzzy sliding mode controller to reduce the roll motion at zero speed [26]. Liang et al achieved the control strategy for zero-speed fin stabilizer based on phase matching between disturbance and compensation in at-anchor conditions [27]. According to the simulation and test results in the above literature, it can be concluded that the control signal of the zero-speed fin stabilizer can be roughly divided into two types: the trapezoidal and sinusoidal fin angle signals.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on the control form of fin stabilizer at zero speed

et al. 2019

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The zero-speed fin stabilizer is used to stabilize the roll motion of the ship at full speed. It has two working modes, that is the lift-based normal anti-rolling mode and the drag-based zero-speed anti-rolling mode. Different force generation mechanisms cause different control methods, especially in the form of control. The zero-speed fin stabilizer works in a sinusoidal fashion in normal mode, the same as the conventional fin stabilizer. However, its control form at zero speed is not particularly clear. This paper aims to investigate the control form of fin stabilizer at zero speed through a composite method of theoretical analysis and experimental research. Based on the established reaction force model, the forces generated on the fin flapped in sinusoidal and trapezoidal forms are compared and analyzed. It is found that the trapezoidal form flapping with a small half-cycle ratio generates larger force than the sinusoidal flapping form when the flapping amplitude is the same. The forced rolling tank tests with the fins flapping in sinusoidal and trapezoidal forms were conducted. The test results are consistent with the theoretical analysis results, and the trapezoidal flapping form with a proper small half-cycle ratio is recommended for fin stabilizers at zero speed. The control strategy of fin stabilizer at zero speed is obtained based on the further analysis of the force characteristics of the trapezoidal flapping form and the limitations of the actual fin stabilizer actuation system. The model and full scale roll reduction tests at zero speed were conducted, achieving more than 70% and 60% of the anti-rolling effect respectively. The test results further verify the effectiveness, applicability and practicability of the obtained control form and strategy for fin stabilizers in at-anchor conditions, and can be a reference for engineering practice and other similar studies.

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Section: Theoretical Analysismentioning

confidence: 99%

Section: System Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental study on the control form of fin stabilizer at zero speed

et al. 2019

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“…Among them, the fin anti-rolling has the best effect, which can reach more than 80% [4]. However, the fin anti-rolling relies too much on the speed of the ship to obtain the lift on the fins, so that it has a good effect of reducing the rolling at medium and high speed, but hardly works at low speed or even zero speed [5]. Therefore, in order to extend the advantage of fin stabilizer from medium-high speed to low or even zero speed, scholars have designed a zero-speed fin stabilizer by actively tapping the water to obtain the lift on the fin and proposed a corresponding control strategy [6] [7].…”

Section: Introductionmentioning

confidence: 99%

Adaptive neural network control of zero speed ship rolling motion based on state observer

He¹,

Sun²,

Li³

2023

International Conference on Computer, Artificial Intelligence, and Control Engineering (CAICE 2023)

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In this paper, an adaptive neural network control method based on state observers is proposed for the rolling motion control problem of zero-speed ships. By combining the neural network with the disturbance observer technique, the internal and external uncertainties of the rolling motion control system of zero-speed ships are overcome. Considering that the ship's rolling angular velocity is difficult to be measured accurately under the actual sea state, the state observer is introduced to estimate the unknown rolling angular velocity. Finally, the simulation results verify the effectiveness of the control scheme.

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“…In contrast, a fin stabilizer has the best anti-roll effect, which can reach about 85-90%. Therefore, many scholars have devoted their attention to fin stabilizers and proposed a variety of different control methods [8].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Neural Network Control of Zero-Speed Vessel Fin Stabilizer Based on Command Filter

2022

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This paper proposes a zero-speed vessel fin stabilizer adaptive neural network control strategy based on a command filter for the problem of large-angle rolling motion caused by adverse sea conditions when a vessel is at low speed down to zero. In order to avoid the adverse effects of the high-frequency part of the marine environment on the vessel rolling control system, a command filter is introduced in the design of the controller and a command filter backstepping control method is designed. An auxiliary dynamic system (ADS) is constructed to correct the feedback error caused by input saturation. Considering that the system has unknown internal parameters and unmodeled dynamics, and is affected by unknown disturbances from the outside, the neural network technology and nonlinear disturbance observer are fused in the proposed design, which not only combines the advantages of the two but also overcomes the limitations of the single technique itself. Through Lyapunov theoretical analysis, the stability of the control system is proved. Finally, the simulation results also verify the effectiveness of the control method.

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Simulation and experimental study on control strategy of zero-speed fin stabilizer based on disturbance and compensation

Cited by 8 publications

References 16 publications

Experimental study on the control form of fin stabilizer at zero speed

Experimental study on the control form of fin stabilizer at zero speed

Adaptive neural network control of zero speed ship rolling motion based on state observer

Adaptive Neural Network Control of Zero-Speed Vessel Fin Stabilizer Based on Command Filter

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