共查询到17条相似文献,搜索用时 187 毫秒
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骑浪/横甩是IMO船舶第二代完整稳性的五种失效模式之一,是一种基于概率的稳性衡准,制定规范的目的是更有效地保障船舶在实海域中的航行安全,确保不发生稳性失效情况.本研究中,以IMO有关成员国提出的最新版骑浪/横甩薄弱性衡准草案为基础,基于自主开发的骑浪/横甩薄弱性衡准校核软件,针对围网渔船开展了样船计算和比较分析,研究IMO正在制定的骑浪/横甩薄弱性衡准方法对该类船型的适用情况,分析船型参数对骑浪/横甩薄弱性衡准的影响,为我国参与国际法规制定,提出针对骑浪/横甩薄弱性衡准的提案提供技术支撑和依据. 相似文献
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目前国际海事组织(IMO)正在制定的第二代完整稳性衡准,其中就包括骑浪/横甩薄弱性衡准。文章首先介绍了最新骑浪/横甩薄弱性衡准方法,应用自编的衡准软件进行样船计算,分析了当前衡准的适用性。其次,开展了内倾船型在随浪和尾斜浪中的骑浪/横甩试验,试验中获得了四种与骑浪/横甩相关的运动特性:周期运动、稳定骑浪、横甩和横甩导致的倾覆,而且在某波浪条件下观察到船舶连续发生三次横甩的现象。最后,将内倾船型的骑浪/横甩薄弱性衡准计算结果与试验结果进行对比,验证了衡准方法对于内倾船型的适用性。 相似文献
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《中国造船》2021,(2)
国际海事组织(IMO)正在制定的船舶第二代完整稳性衡准规范中明确了对于无法通过第一和第二层薄弱性衡准校核的船舶,可通过施加营运限制或施行操船指南的方式使其达到规范要求的安全水平。论文聚焦骑浪/横甩稳性失效模式,阐述规范中与其相关的营运限制及操船指南制定方法。应用规范中提供的有限散布表方法和简化操船指南法对国际标模ITTC-A2渔船和我国的一艘围网渔船进行了计算研究和对比分析。结果表明,对于选取的样船,根据有限散布表法的计算结果施行营运限制将是十分不利的,在有义波高接近1m的情况下船舶就将无法营运;推荐采用简化操船指南的方式,在不利海况中降速20%左右,以确保船舶的航行安全。这项研究为无法通过第二层骑浪/横甩薄弱性衡准校核的船舶提供了营运操船方面的解决方案,为国内更好应对二代稳性规范将带来的冲击和挑战作相应的技术储备。 相似文献
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In order to develop design and operational criteria to be used at the International Maritime Organization (IMO), critical
conditions for broaching are explored in the light of bifurcation analysis. Since surf-riding, which is a prerequisite to
broaching, can be regarded as a heteroclinic bifurcation, one of global bifurcations, of a surge-sway-yaw-roll model in quartering
waves, the relevant bifurcation condition is formulated with a rigorous mathematical background. Then an efficient numerical
solution procedure suitable for tracing the surf-riding threshold hypersurface is presented with successful examples. This
deals with all state and control variables in parallel, and excludes backward time integration and an orthogonal condition
in the iteration process. The bifurcation conditions identified were compared with the results from a direct numerical simulation
in the time domain. As a result, it was confirmed that the heteroclinic bifurcation provides a boundary between motions periodically
overtaken by waves and nonperiodic motions such as surf-riding and broaching. 相似文献
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By utilizing a four-degrees-of-freedom numerical model with dense grids of control parameters and the sudden-change concept,
the qualitative aspects of the nonlinear motions of a fishing vessel complying with the International Maritime Organization's
intact stability criteria in following and quartering seas were intensively explored. As a result, capsizing due to broaching,
capsizing without broaching, broaching without capsizing, stable surf-riding, and steady periodic motion were identified.
The natures of the boundaries of these motions in the control parameter plane were investigated, and the effects of the initial
conditions and the nonlinearity of calm-water maneuvering forces are also discussed. Furthermore, comparisons with a model
experiment showed that the numerical model used here qualitatively explains capsizing phenomena, but quantitatively overestimates
the danger of capsizing.
Received: June 11, 2001 / Accepted: October 9, 2001 相似文献
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Naoya Umeda Satoshi Usada Kentaro Mizumoto Akihiko Matsuda 《Journal of Marine Science and Technology》2016,21(1):23-37
To avoid stability failure due to the broaching associated with surf riding, the International Maritime Organization (IMO) has begun to develop multilayered intact stability criteria. A theoretical model using deterministic ship dynamics and stochastic wave theory is a candidate for the highest layer of this scheme. To complete the project, experimental validation of the theoretical method for estimating broaching probability in irregular waves is indispensable. We therefore conducted free-running model experiments using a typical twin-propeller and twin-rudder ship in irregular waves. A simulation model of coupled surge–sway–yaw–roll motion was simultaneously refined. The broaching probability calculated by the theoretical method was within the 95 % confidence interval of that obtained from the experimental data. This could be an example of experimental validation of the theoretical method for estimating the broaching probability when a ship meets a wave. 相似文献
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船舶骑浪运动的分叉研究 总被引:1,自引:0,他引:1
在纵荡运动模型的基础上,应用非线性动力学理论对骑浪产生的机理进行了研究,确认了骑浪运动是一个从周期运动到骑浪的过程,其中经历了两次分叉.给出了导致骑浪发生的危险临界参数值,以及周期运动和骑浪运动区域划分. 相似文献