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Research on Structure Reliability of Ship Hull Subjected to Underwater Explosion

Author: TanHaiTao
Tutor: WangShan
School: Harbin Engineering University
Course: Solid Mechanics
Keywords: Underwater explosion Shock wave Bubble pulse Naval panels Structural Reliability
CLC: U661.4
Type: PhD thesis
Year: 2009
Downloads: 294
Quote: 1
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Abstract


Ship subjected to underwater weapons attack in the case of non-contact explosion, hull structure will be the destructive effects of underwater explosion shock wave and bubble pulse load, underwater hull structure antiknock research has been the attention of naval power. This paper first introduces the basic principles of structural reliability in a structural reliability calculation is the checking point method based on the proposed response surface method, followed by underwater explosion shock wave peak overpressure bubble pulsation the bubble pulsation structure interaction. Given the reliability of the method on the basis of, respectively, under the pressure of the shock wave and bubble pulse the hull plate frame structure impact reliability analysis, and the hull under Explosion Ultimate Longitudinal Strength of reliability analysis. In order to meet the needs of high-precision engineering practice reliability calculation method, the structure function in the design checking point at $ decomposition of higher-order approximation, the response surface method for reliability calculation. Numerical examples show that the proposed method with the direct Monte Carlo simulation method is very close to the results; considerable number of calculations, the results of this method has higher accuracy than the FORM method, indicating that the method with respect to the FORM method , more accurate approximation of the structure function, with high computational efficiency, and can be used for reliability calculations for high precision engineering problems. Non-contact underwater explosion shock wave and bubble pulse related to the basic theory. Use of existing energy flux density formula to derive the expression of non-contact explosion underwater shock wave peak pressure. Hull broadside protection structure is dominated by the board frame, the the research board frame structure under blast loading response antiknock research of the warship. Established a simplified mathematical model of underwater explosion shock wave, consider the role of fluid-structure interaction between water and plate rack, acting on the plate rack shock loading formula. And theoretical plate frame structure underwater non-contact dynamic response under blast loading analysis derived analytic expression response in the ship ship's rail side plate frame stiffened plate grid in non-contact underwater explosion shock waves style. The minimization of the function random process, the function function becomes time-independent random variables, analysis of the impact the reliability of the ship to the ship's side side plate frame stiffened plate lattice structures under impact loading. Based on potential flow theory, the establishment of an underwater explosion bubble pulsation model, taking into account the energy loss between the pulsating, pulsatile flow on the underwater explosion bubble has been calculated. Comparison of calculation results with the experimental analysis, the theoretical formula to calculate the bubble pulsation cycle, velocity contour with the actual situation is in good agreement with the bubble pulse pressure with the experimental error is slightly larger, but still works within the allowable range, indicating that this article established the bubble pulse correctness of the model. Followed by an analysis of a clamped rectangular plate frame exists in the underwater bubble pulsation characteristics, and pulsation at the same time by the relative motion of the rectangular plate frame, deduced the law of bubble motion equation, and the panels subjected to underwater explosion bubble the dynamic response of pulsating pressure to conduct research, analyze its reliability. For longitudinal strength of research in the past few related to the longitudinal strength of the ship in the explosion and other extreme loading conditions and reliability analysis. Research hull structure by underwater explosion shock wave caused by the residual strength after local damage, the application of response surface methodology based on the checking point decomposition damaged hull structure subjected to underwater explosion bubbles additional loads, wave loads and hydrostatic loads joint action Hull with the ultimate strength of the reliability of the calculation and analysis. And multiple working conditions burst from the longitudinal strength of the reliability of the calculations, conclusions are drawn: compared with the calculation results under normal load state that, to underwater explosion affect their ships Ultimate Longitudinal Strength of reliable degrees load. The calculation results show that the three conditions considering underwater explosion shock waves caused partial damage of the hull, a reliable indicator of the hull structure by an underwater explosion bubble additional loads than not consider the bubble load is lower, and the difference is obvious, indicating that the bubble additional load is an integral part of the structural design under extreme loading conditions of the ship. Additional loads in the calculation of the underwater explosion bubble under the hull longitudinal strength reliability, you can not ignore the impact of the wave loads, must consider the combined effect of bubbles additional loads and wave loads.

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CLC: > Transportation > Waterway transport > Marine Engineering > Ship Principle > Ship structural mechanics
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