共查询到19条相似文献,搜索用时 203 毫秒
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采用通用有限元计算软件Patran对俄罗斯某小型民用全垫升式气垫船船底结构进行分析,对密加筋式船底结构及纵骨架式船底结构分别建立有限元模型,通过计算两种船底结构在首冲砰击载荷下的瞬态响应特征,对比分析得到抗砰击效果较好的气垫船船底结构,为气垫船的结构设计提供参考. 相似文献
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采用有限元计算软件MSC.Patran对某气垫船首部船底结构进行瞬态响应分析,对加筋板悬挂式结构及常规切口式船底结构分别建立有限元模型,计算2种船底结构在受波浪砰击载荷下的瞬态响应特征,从其局部强度和局部振动特性对比分析得到抗砰击效果较好的气垫船船底结构,为该型艇的结构设计提供参考。 相似文献
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基于海浪波面的随机特性,研究船舶底部砰击压力的计算方法.分析纵向入水角对船底砰击压力量值的影响程度,建立二者之间的定量关系.在预报船舶砰击压力时引入随机海浪的波面条件,计及船舶运动和海浪波面倾角因素对砰击压力的影响.采用蒙特卡罗数值模拟法对砰击压力的统计规律进行研究,结果表明:计及纵向入水角的船底砰击压力计算方法.更加... 相似文献
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HCSR共同结构规范于2015年7月1日强制生效.HCSR最小厚度要求整合了原CSR油船和散货船的要求,相对油船来说,HCSR最小厚度的要求比CSR要求更高,将导致原来符合CSR的油船设计不再满足HCSR.本文特分析HCSR最小板厚对现有船舶的影响. 相似文献
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本文主要阐述为满足油船CSR(共同结构规范)要求,进行油船的有限元分析。文中选用了比较典型的双壳油船货舱结构来进行有限元分析,为油船的结构设计优化提供理论依据。 相似文献
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随着油船共同结构规范(CSR)的推出,对油船的设计和开发影响很大,但业界讨论的大多是对规范实施中的变化、计算方法及计算工具等,如何详细分析评估油船结构节点的强度则较少提及。在此,基于CSR给出的油船结构节点细化分析的实施要求及衡准,以某5万吨级成品油船的槽形横舱壁顶凳底板与舷侧水平桁相交区域和槽形横、纵舱壁顶凳底板十字相交区域为例,对节点不同设计方案进行计算,经比较分析取得符合CSR的结构要求和衡准的设计方案。整个方案设计的过程及对油船典型节点的细化分析,可供同行在节点设计中参考。 相似文献
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超大型集装箱船的船艏显著外飘、船艉宽平外悬,使其在恶劣海况下航行时容易发生严重的砰击。为确保船体艏艉部结构在砰击中不发生损坏,需要研究作用到艏艉外板上的砰击压力,并以此为设计载荷来校核外板和相连结构的强度。目前对集装箱船砰击局部强度的校核要求仍以经验公式为主,但是为提高对超大尺度船舶强度校核的可靠性,近年来推出了砰击的直接分析方法。本文初步分析了砰击直接分析方法的基本原理,并运用该方法对20,000 TEU集装箱船的艏、艉部砰击压力以及最小板厚要求进行了研讨,其结果可为超大型集装箱船的结构设计提供重要的参考。 相似文献
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依据散货船共同结构规范的要求对某散货船船中区域主要结构进行屈曲强度直接计算,重点分析其屈曲强度,对不满足屈曲强度要求的板格进行加强,结果表明,共同规范对船体结构的要求更高。 相似文献
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The deformation of boat hull bottom panels during the initial phase of slamming is studied analytically using a linear elastic Euler–Bernoulli beam as a representation of the cross section of a bottom panel. The slamming pressure is modeled as a high-intensity peak followed by a lower constant pressure, traveling at constant speed along the beam. The problem is solved using a Fourier sine integral transformation in space and a Laplace–Carson integral transformation in time. Deflection and bending moment as functions of time and position for different speeds, bending stiffnesses, etc. are given. In particular the effect of slamming load traveling speed on structural response of the simplified bottom structure is investigated. It is found that rather large deflections and bending moments are encountered at certain speeds of the pressure, which suggests that bottom panels may benefit from tailoring their stiffness and mass properties such that loads are reduced. This would vary with boat particulars and operation (deadrise angle, mass, speed, sea state, etc). The importance of the high-intensity pressure peak often encountered during slamming is also studied. It is seen that for relatively slow moving slamming loads the pressure peak has little influence. However, for faster moving loads its influence can be significant. 相似文献
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舰船的砰击载荷与结构响应的研究一直备受关注.对于双体船来说,砰击按部位可分为底部砰击、外飘砰击和甲板上浪,和连接相邻船体的甲板下侧,即湿甲板砰击.目前对于双体船的砰击计算还不完善,因此对于该船型的砰击研究十分必要.本文分别利用规范计算和直接计算的方式,对砰击载荷作用下双体船强度影响进行研究.规范计算主要基于中国船级社规范计算砰击载荷,直接计算则是通过线性势流理论预报船波相对速度,借助相关规范确定砰击压力系数,实现砰击载荷的直接计算.通过有限元软件加载计算,分析比较2种载荷计算方法对双体船强度的影响,以指导砰击载荷作用下双体船局部结构的设计实践. 相似文献
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Hirofumi Yoshimoto Shigeo Ohmatsu Kunihiro Hoshino Tetsuro Ikebuchi 《Journal of Marine Science and Technology》1997,2(3):163-172
The objective of this paper is to estimate the slamming load acting on a pontoon-type very large floating structure with a
shallow draft. Experiments were carried out using elastic models with different rigidities in regular waves. The results revealed
that the slamming load was strongly influenced by the rigidity of the model. The conditions under which slamming occurs depended
on the extent of the bottom emergence and the velocity of the relative wave height at the bow of the model. These results
were related to a simple procedure for estimating slamming load. 相似文献
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Dynamic response of ship-hull structure under slamming has tracked widespread attention in the marine structural design. However, our understanding on the dynamic characteristics largely relies on the symmetrical slamming cases. This paper presented a preliminary numerical investigation on the dynamic response of a truncated ship-hull structure under asymmetrical slamming based on the uncoupled CFD-FE method. Asymmetrical slamming loads were predicted through combining the seakeeping analysis and CFD method. In there, three kinds of motions (vertical, horizontal and roll motions) of 2D ship sections were obtained through the seakeeping analysis and then the slamming pressure was predicted through simulating the water entry with various motions based on CFD method. The dynamic response was analyzed through finite element method. Numerical predictions including ship motions, slamming loads and dynamic analysis were validated against published experimental data and numerical calculations. The characteristics of asymmetrical slamming loads were analyzed showing obvious asymmetry in space, and the dynamic characteristic of the ship bow structure was further clarified through discussing the deformation and stress distribution. These results are useful for readers for better understanding the dynamic characteristics of the bow structure under slamming. 相似文献
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本文采用VOF和动网格方法、考虑限制水域边界条件的约束因素,利用CFD商业软件FLUENT通过求解脉冲砰击压力作用下具有自由表面限制水域上的Navier-Stokes方程来分析与观察一定倾角的矩形结构从一定高度自由落下砰击限制水域的水面所引起的三维流体动力现象,并与无倾角的矩形结构撞击有限水深水域的水面所引起的三维水面波动和水下压力场变化问题做对比分析。数值模拟结果表明采用本文所提出的数值方法可以对大型结构作用于封闭或开放水域的水面所激发起的水面波动和水下压力场变化进行有效的数值模拟。这一数值方法为工程上分析大型结构砰击限制水域水面所产生的水动力现象提供了一种实用的手段。 相似文献