Anti-sloshing effects of a vertical porous baffle in a rolling rectangular tank

George, Arun; Cho, Il-Hyoung

doi:10.1016/j.oceaneng.2020.107871

Cited by 29 publications

(9 citation statements)

References 26 publications

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“…To reduce ship roll motion, devices such as gyrostabilizers [3], Magnus rotating roll stabilizers [4,5], anti-rolling tanks [6], and fin stabilizers [7] have been designed and manufactured. Among them, the fin stabilizer is the most widely used and effective antirolling device currently in use [2,8].…”

Section: Anti-rolling Devicementioning

confidence: 99%

Wavelet Neural Network-Based Half-Period Predictive Roll-Reduction Control Using a Fin Stabilizer at Zero Speed

Zhang,

Zhao,

Gui

et al. 2023

JMSE

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Among the commonly used ship-stabilizing devices, the fin stabilizer is the most effective. Since the lift force of the conventional fin stabilizer is proportional to the square of the incoming flow velocity, it has a better anti-rolling effect at higher speeds but a poor anti-rolling effect at low speeds and even no effect at zero speed. A combination of modelling analysis, simulation, and a model ship experiment is used in this paper to study the zero-speed roll-reduction control problem of the fin stabilizer. A simulation model of the rolling motion of a polar expedition ship is established. The lift model of the fin stabilizer at zero speed is established using the theory of fluid mechanics. The proportional–integral–differential (PID) controller is selected to control the fin to achieve zero-speed roll reduction. To obtain a better anti-rolling control effect under variable sea conditions, a wavelet neural network (WNN)-based half-period prediction algorithm is adopted to update and adjust PID control parameters in real time. A simulation was carried out, and the effectiveness of the proposed predictive control algorithm is proved. A reduced-scale ship model was established to carry out the water tank experiment, and the results verify the theoretical analysis and simulation. The results also verify the effectiveness of the proposed control strategy.

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Section: Anti-rolling Devicementioning

confidence: 99%

Wavelet Neural Network-Based Half-Period Predictive Roll-Reduction Control Using a Fin Stabilizer at Zero Speed

Zhang,

Zhao,

Gui

et al. 2023

JMSE

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show abstract

“…Depending on the overall aim of the simulation, either the micro-or the macro-scale approach can be more suitable. For thin porous structures, the micro-scale approach has been used in most of the literature, where common objectives are to derive hydrodynamic coefficients, as for instance by Mentzoni and Kristiansen [127] for an oscillating perforated sheet or by George and Cho [128] for a sloshing tank with a baffle; or to validate simpler (e.g. analytical) models, as for example by Poguluri and Cho [129] for a vertically slatted barrier.…”

Section: 3mentioning

confidence: 99%

A Review on the Modelling of Wave-Structure Interactions Based on OpenFOAM

Huang

Benites-Munoz

et al. 2022

OpenFOAM J

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The modelling of wave-structure interaction (WSI) has significant applications in understanding natural processes as well as securing the safety and efficiency of marine engineering. Based on the technique of Computational Fluid Dynamics (CFD) and the open-source simulation framework - OpenFOAM, this paper provides a state-of-the-art review of WSI modelling methods. The review categorises WSI scenarios and suggests their suitable computational approaches, concerning a rigid, deformable or porous structure in regular, irregular, non-breaking or breaking waves. Extensions of WSI modelling for wave-structure-seabed interactions and various wave energy converters are also introduced. As a result, the present review aims to help understand the CFD modelling of WSI and guide the use of OpenFOAM for target WSI problems.

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“…Arif et al [29] used a floating baffle-wall setup to reduce maintenance costs and made the baffle grid wall a floating object for the LNG tanks. A porous baffle-wall system has been used in a rolling rectangular tank to analyze the potentiality of the cavity on the wall by George and Cho [30]. Another anti-sloshing technique using floating foam in a rectangular tank and studying the hydrodynamics has been done by Zhang et al [31].…”

Section: Background and Related Workmentioning

confidence: 99%

Stability Analysis of a Sprayer UAV with a Liquid Tank with Different Outer Shapes and Inner Structures

et al. 2022

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The performance of sprayer UAVs largely depends on accurate trajectory control while spraying. A large amount of a liquid payload may create a sloshing effect inside the liquid tank, which may occur largely during hazardous phenomena, such as wind gusts and obstacle avoidance. This all-way sloshing force inside the tank may disturb the UAV’s trajectory by, for example, a displacement from the planned path or collision with an obstacle. A large number of existing sprayer UAVs already carry various-shaped tanks. A UAV’s liquid-sloshing problem must be reduced for existing and future plant protection. Applying suitable methods can achieve these goals and provide better performance. Moreover, various tank models have different structures and capabilities, which must be fixed using a flexible solution. This article proposes a simple baffle solution for all forms of pesticide tanks and compares baffle systems’ impacts using primary shaped tanks. Indoor lab experiments showed the extreme impacts inside the tanks. Outdoor UAV mission experiments provided the practical effectiveness of the tank structures, and primary shaped tank comparison results provided guidance for future UAV pesticide-tank manufacturing. A new baffle ball design is presented for a universal solution. A one-axis linear slider was used for optical observations, an open-source flight controller was used for on-field compliance, and plenty of tests were done to prove the concept and show the efficiency. The flat hexagonal tank and baffle ball system showed better results in both indoor and outdoor experiments.

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Anti-sloshing effects of a vertical porous baffle in a rolling rectangular tank

Cited by 29 publications

References 26 publications

Wavelet Neural Network-Based Half-Period Predictive Roll-Reduction Control Using a Fin Stabilizer at Zero Speed

Wavelet Neural Network-Based Half-Period Predictive Roll-Reduction Control Using a Fin Stabilizer at Zero Speed

A Review on the Modelling of Wave-Structure Interactions Based on OpenFOAM

Stability Analysis of a Sprayer UAV with a Liquid Tank with Different Outer Shapes and Inner Structures

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