Physical modeling for underwater flexible systems dynamic simulation

Lee, Chun‐Woo; Lee, Ju Hee; Cha, Bong-Jin; Kim, Hyun-Young; Lee, Jihoon

doi:10.1016/j.oceaneng.2004.08.007

Cited by 93 publications

(55 citation statements)

References 12 publications

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“…The ropes and purse line were divided into finite elements, each consisting of a finite number of mass points connected through the springs with the same properties as above. In order to reduce the computational effort for such a flexible structure, which consists of numerous mass points, we used a mesh grouping method; approximately 5000 actual meshes were bundled as a virtual mathematical mesh with the same physical properties of mass, specific gravity, weight, projected area, and hydrodynamic coefficient [10]. One additional mass point was also placed between two adjacent knots to represent the bending characteristic of the bar (Fig.…”

Section: Equation Of Motionmentioning

confidence: 99%

“…Numerous studies have been conducted on hydrodynamic coefficients [10,[13][14][15], but no versatile method has been adopted for determining the hydrodynamic coefficient due to the involvement of numerous factors. Likewise, because of difficulties in encoding the program, studies rarely allow two decisive parameters in the drag coefficient to be included when making a simulation.…”

Section: Improved Hydrodynamic Coefficientsmentioning

confidence: 99%

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The sinking performance of the tuna purse seine gear with large-meshed panels using numerical method

Hosseini¹,

Lee

Kim

et al. 2011

Fish Sci

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This paper reports an improved version of the numerical method used in a previous study on the dynamic simulation of purse seine gear in three dimensions. The improvement is achieved by refining the mass-spring model to take into account both the drag coefficient as a function of the attack angle and Reynolds number as applied to the setting operation of the purse seine gear. The validity of the numerical simulation is assessed by comparing the measured and calculated values for the sinking depth of the net. The numerical simulation is used to examine the sinking performance of the different designs in which large meshed-panels and netting materials are used together in the main body section of the netting. The results indicate that, compared to the prototype net, nets bearing larger mesh panels require more sinking depth with much more pronounced operational depth at corresponding times of the fishing operation when heavier netting material is used. Moreover, in the new net designs, lower tensile forces are exerted on both ends of the pure wire during pursing. The new net constructions with regard to the operational depth represent alternatives that may reduce the potential problem of frequent failed setting of the tuna purse seine gear.

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Section: Equation Of Motionmentioning

confidence: 99%

Section: Improved Hydrodynamic Coefficientsmentioning

confidence: 99%

The sinking performance of the tuna purse seine gear with large-meshed panels using numerical method

Hosseini¹,

Lee

Kim

et al. 2011

Fish Sci

Self Cite

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“…The detailed description of the mathematical model is described in a previous article (Lee et al, 2005b); therefore, we briefly describe the mathematical model below. The equation of motion, according to Lee et al (2005a), can be described as follows:…”

Section: Methodsmentioning

confidence: 99%

Estimation of tuna longline hook depth for improved performance in Fiji

Bainves¹,

Lee²,

Park³

2017

J. Korean Soc. Fish. Technol.

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In pelagic longline, deploying the gear such that the depth of the hook is the same as that of the target fish is important to improve the fishing performance and selectivity. In this study, the depth of the tuna longline hook was estimated using the mass-spring model, catenary curve method, and secretariat of the pacific commission Pythagorean method in order to improve the performance of the longline gear in Fiji. The former two methods were estimated to be relatively accurate, and the latter showed a large error. Further, the mass-spring model accounted for the influence of tidal current in the ocean, which was found to be appropriate for use in field trials.

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“…There also exist studies that compare flume tank results with full-scale sea trial data for both isolated nets and full gear [50,13,18]. In addition, a number of numerical models to simulate net dynamics have been developed [3,23,27,49,34,44,20], and also some models of complete gears, including a crude [19] or somewhat fair [14,33] description of trawl door behaviour, have been devised. A careful literature search shows that the first and only full trawl gear simulation embodying thorough modelling of the otter boards was undertaken by [35].…”

Section: Introductionmentioning

confidence: 99%

Testing otter board hydrodynamic performances in wind tunnel facilities

et al. 2015

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The feasibility and potential advantages of wind tunnel testing of otter board designs is assessed. Traditional flume tank tests incur high operational costs and present some limitations in terms of flexibility and accuracy. Modern flume tanks, despite more flexible and accurate, are still expensive to operate or hire. Wind tunnel facilities are widespread, with a potential for low budget tests, and allow for an accurate control of velocity, angle of attack and sideslip as well as precise measurement of forces and moments in all three axes. A complete description of otter board hydrodynamics is paramount to optimising design and rigging and for the design of active control strategies that allow for stable trawling at a target speed and depth. We describe in detail the methodology of wind tunnel tests applied to general otter board designs, exemplify it with a commercial pelagic otter board and provide a comparison with existing flume tank results for the same design.

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Physical modeling for underwater flexible systems dynamic simulation

Cited by 93 publications

References 12 publications

The sinking performance of the tuna purse seine gear with large-meshed panels using numerical method

The sinking performance of the tuna purse seine gear with large-meshed panels using numerical method

Estimation of tuna longline hook depth for improved performance in Fiji

Testing otter board hydrodynamic performances in wind tunnel facilities

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