Hydro-elastic-plastic dynamic response of a ship hull girder subjected to an underwater bubble

Zhang, N.; Zong, Zhaoyun

doi:10.1016/j.marstruc.2012.05.008

Cited by 15 publications

(4 citation statements)

References 19 publications

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“…By taking 1 mPa as a reference pressure, the sound source level (SL) in our case can then be estimated as 240.6 dB. The empirical formula of the scattering coefficient limit on the sea surface is given by 2 10log 10 l sf 0 ¼ 24:59log 10 tf 1 3 À 83:52 (21) which is applicable below 6.4 kHz. Here v means the surface wind speed.…”

Section: Results and Comparisonmentioning

confidence: 99%

“…Here v means the surface wind speed. Substituting the dominating frequency interval to equation (21) yields À60 -À40 dB and thereby we take 10log 10 l sf 0 ¼ À50 dB as a constant approximation. Under the assumption (1) and frequency below 30 kHz, it has been widely confirmed that the scattering coefficient limit on the seabed is almost unchanged and considering the lakebed constituents as gravels and muds gives 10log 10 l sb 0 ¼ À25 dB roughly.…”

Section: Results and Comparisonmentioning

confidence: 99%

“…Early works on underwater explosion carried out in England, Canada and the United States have been thoroughly surveyed by Cole, 18 like the pressure empirical formulas of the shock wave and bubble pulsation and followed by a few specific modifications to enable more accurate estimation. 19 Benefits from fast development of the computers and various numerical techniques, like the boundary element method (BEM), 20 doubly asymptotic approximation (DAA), 21 spectral element method (SEM) 22 and smoothed particle hydrodynamics (SPH), 23 recent studies on underwater explosion have been promoted to a wider space. For instance, free pulsation of the bubbles, 24 reflection and transmission of the shock waves near boundaries, 25 interaction between the bubble and boundaries 26 and damage of the shock waves and bubbles towards marine structures.…”

Section: Underwater Explosion (Sounds)mentioning

confidence: 99%

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A three-dimensional bistatic reverberation model of underwater explosion by interface scattering at variable sound speeds

Guo

Liu

Sheng

et al. 2018

Journal of Low Frequency Noise, Vibration and Active Control

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Underwater reverberation is a main limitation of the sonar performance and thereby the reverberation level estimation becomes crucial. In this study, based on the Lambert law and ray theory, a model for predicting 3D bistatic reverberation performance by interface scattering at linear sound speed profile is established and then verified through the underwater explosion experiments. The Influences of source and receiver positions, and relative sound speed gradient on reverberation performance are further investigated. The results indicate that: (1) the proposed model can predict the shortrange mean reverberation level effectively, with the deviation 2-4 dB and describe the whole reverberation level distribution in some details; (2) at the early reverberation phase, the interference effects between the interface scattering sounds are considerable and a dominating interface exists; the counterbalance between the losses by scattering, spreading and medium absorption results in the local high-intensity zones close to corresponding interfaces, respectively; (3) as the sound source moves towards some interface, associated local high-intensity zone gradually expands, while the other one shrinks; if the sound speed approaches are constant, an extra local high-intensity zone will appear between the previous two but with a lower magnitude.

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Section: Results and Comparisonmentioning

confidence: 99%

Section: Results and Comparisonmentioning

confidence: 99%

Section: Underwater Explosion (Sounds)mentioning

confidence: 99%

See 1 more Smart Citation

A three-dimensional bistatic reverberation model of underwater explosion by interface scattering at variable sound speeds

Guo

Liu

Sheng

et al. 2018

Journal of Low Frequency Noise, Vibration and Active Control

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“…Hicks (1986) studied the "whipping response" of the ship hull subjected to the underwater explosion bubble. The dynamic hydro-elasticplastic response of the ship hull induced to a bubble impulsive pressure was studied by Zong (2005) and Zhang and Zong (2012). However, spherical bubble pulsation models cannot consider the jet load that is crucial in near-field underwater explosions.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear interaction between underwater explosion bubble and structure based on fully coupled model

Zhang

Liu

et al. 2017

Physics of Fluids

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The interaction between an underwater explosion bubble and an elastic-plastic structure is a complex transient process, accompanying violent bubble collapsing, jet impact, penetration through the bubble, and large structural deformation. In the present study, the bubble dynamics are modeled using the boundary element method and the nonlinear transient structural response is modeled using the explicit finite element method. A new fully coupled 3D model is established through coupling the equations for the state variables of the fluid and structure and solving them as a set of coupled linear algebra equations. Based on the acceleration potential theory, the mutual dependence between the hydrodynamic load and the structural motion is decoupled. The pressure distribution in the flow field is calculated with the Bernoulli equation, where the partial derivative of the velocity potential in time is calculated using the boundary integral method to avoid numerical instabilities. To validate the present fully coupled model, the experiments of small-scale underwater explosion near a stiffened plate are carried out. High-speed imaging is used to capture the bubble behaviors and strain gauges are used to measure the strain response. The numerical results correspond well with the experimental data, in terms of bubble shapes and structural strain response. By both the loosely coupled model and the fully coupled model, the interaction between a bubble and a hollow spherical shell is studied. The bubble patterns vary with different parameters. When the fully coupled model and the loosely coupled model are advanced with the same time step, the error caused by the loosely coupled model becomes larger with the coupling effect becoming stronger. The fully coupled model is more stable than the loosely coupled model. Besides, the influences of the internal fluid on the dynamic response of the spherical shell are studied. At last, the case that the bubble interacts with an air-backed stiffened plate is simulated. The associated interesting physical phenomenon is obtained and expounded.

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Numerical Simulation and Response of a Composite Mine Countermeasure Ship Section Subjected to Noncontact Underwater Explosion

Gong

et al. 2023

Lecture Notes in Civil Engineering

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Hydro-elastic-plastic dynamic response of a ship hull girder subjected to an underwater bubble

Cited by 15 publications

References 19 publications

A three-dimensional bistatic reverberation model of underwater explosion by interface scattering at variable sound speeds

A three-dimensional bistatic reverberation model of underwater explosion by interface scattering at variable sound speeds

Nonlinear interaction between underwater explosion bubble and structure based on fully coupled model

Numerical Simulation and Response of a Composite Mine Countermeasure Ship Section Subjected to Noncontact Underwater Explosion

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