Numerical modal analysis of composite structures coupled with water

Kwon, Young W.; Plessas, S.D.

doi:10.1016/j.compstruct.2014.05.032

Cited by 20 publications

(4 citation statements)

References 15 publications

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“…Hence surrounding fluid increases the mass matrix and decreases natural frequency. Mean decrease in natural frequencies due to FSI was around 21%, which is in agreement with results reported by other researchers 3,4,5,11 .…”

Section: Modal Response Of Shell Partially Submerged In Water In Freesupporting

confidence: 92%

Study of Vibration Behaviour of Stiffened Polymer Composite Shells for Underwater Structural Applications

Patil¹,

Murthy²,

Srivatsa³

et al. 2020

Def. Sc. Jl.

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This paper presents vibration behavior of ring stiffened polymer composite thick shells used for underwater structures. Filament wound shells stiffened with internal and external rings and with hemispherical ends were tested for vibration in air and water in free-free boundary condition using roving hammer and fixed response method. Modal testing of the shells was performed under hydrostatic loading in a custom designed buckling tester for determining natural frequency at higher sea depths. Accelerometer was mounted on the inner surface of the shell. It was excited using a plumbob, rope and pulley arrangement. Experimental results were validated by modal analysis using Hyperworks and ANSYS. Vibration behavior in water was simulated by Fluid structure interaction approach. Experimental first natural frequency in water was lesser than that in air. With increase in hydrostatic pressure, the shell showed moderate variation in natural frequency. The experimental and numerical results of natural frequency and mode shapes were in good agreement with each other. Natural frequencies were lower in long and thick shells.

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Section: Modal Response Of Shell Partially Submerged In Water In Freesupporting

confidence: 92%

Study of Vibration Behaviour of Stiffened Polymer Composite Shells for Underwater Structural Applications

Patil¹,

Murthy²,

Srivatsa³

et al. 2020

Def. Sc. Jl.

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“…The structure is very complicated. When the whole ship finite element model is established, it is very complicated to establish the finite element model of the core material and the cap-shaped aggregate [5]. It is of great significance to study the feasibility of the equivalent problem of the core and cap-shaped aggregate.…”

Section: Introductionmentioning

confidence: 99%

Equivalent Research on Main Components of FRP Fishing Boat

Liu

Wang

Mei

et al. 2020

MSF

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Fiberglass reinforced plastic fishing boats is a new type of energy saving and emission reduction boats, which is a significant revolution of fishing craft. However, the design of FRP fishing vessels in China continue to use the similar method employed by steel fishing vessels, which ignores the designability of fiberglass, leading to the light and high strength characteristic of glass fiber buried. the typical structure of FRP boats were analyzed, including the study on the influence of core material on the mechanical properties of cap type girder and the feasibility by using the equal sectional dimension in the Patran software of beam element to equivalent simulate the cap-type material, which simplified the whole ship building process of the finite element model and improved the computational efficiency in this pape.

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“…While the previous research has not considered the FSI effect, other studies [2][3][4][5] showed that the FSI effect on composite structures submerged in water reduces the critical impact loads for failure as well as the number of cycles for failure to occur. In addition, FSI may change vibrational mode shapes, which can result in the shift of the critical failure location.…”

Section: Introductionmentioning

confidence: 99%

“…Polymer composite structures exhibit much more significant fluid-structure interaction (FSI) than do metallic structures since the material densities of such composites are very comparable to that of water [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Study of composite plate traveling in water containing Ice Equivalent Objects

Kwon

Bolstad

Didoszak

et al. 2016

Composite Structures

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a b s t r a c tAn experimental study was conducted for a composite plate traveling in water containing Ice Equivalent Objects (IEO) in order to investigate the drag force exerted on the composite plate as well as its structural response. This study considered both fluid-structure interaction (FSI) as well as solid body interaction. The plate was partially submerged so as to interact with the IEO. As test parameters, the traveling speed and the orientation angle of the plate were changed, and the coverage density of the IEO was also varied. Both drag force and the strain response of the plate were measured when the plate was in either the steady-state or accelerating transient motion. In addition, a high speed camera was utilized to capture the interaction among the composite plates, IEO, and water flow. Computer modeling and simulation was also conducted for some simple cases in order to better aid understanding. The results showed that with the inclusion of the IEO, not only was there an increase in the total drag forces but also a difference in the resulting deformed shapes of the plates. As a result, strain measurements at different locations did not vary proportionally resulting from the IEO.Published by Elsevier Ltd.

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Numerical modal analysis of composite structures coupled with water

Cited by 20 publications

References 15 publications

Study of Vibration Behaviour of Stiffened Polymer Composite Shells for Underwater Structural Applications

Study of Vibration Behaviour of Stiffened Polymer Composite Shells for Underwater Structural Applications

Equivalent Research on Main Components of FRP Fishing Boat

Study of composite plate traveling in water containing Ice Equivalent Objects

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