冰盖下两层流体水波与可渗透起伏海床的作用(英文)

The scattering problem involving water waves by small undulation on the porous ocean-bed in a two-layer fluid,is investigated within the framework of the two-dimensional linear water wave theory where the upper layer is covered by a thin uniform sheet of ice modeled as a thin elastic plate.In such a two-layer fluid there exist waves with two different modes,one with a lower wave number propagate along the ice-cover whilst those with a higher wave number propagate along the interface.An incident wave of a particular wave number gets reflected and transmitted over the bottom undulation into waves of both modes.Perturbation analysis in conjunction with the Fourier transform technique is used to derive the first-order corrections of reflection and transmission coefficients for both the modes due to incident waves of two different modes.One special type of bottom topography is considered as an example to evaluate the related coefficients in detail.These coefficients are depicted in graphical forms to demonstrate the transformation of wave energy between the two modes and also to illustrate the effects of the ice sheet and the porosity of the undulating bed.     

厦门港叫板高雄港

近年来，受各种因素的影响，海峡东岸高雄港的国际集装箱中转港和世界大港地位受到挑战，尤其是来自西岸厦门港的威胁。本文从高雄和厦门两港的地理位置出发，对两港的港航条件、外部环境和吞吐量格局进行了比较分析。     

以科学发展观为指导打造长江黄金水道

学习贯彻十七大精神，对于动员拿党全国各族人民，存以胡锦涛同忠为总书记的党中央坚强领导下，高举中国特色社会主义伟大旗帜，奋力夺取全面建没小埭社会新胜利、圩创中国特色礼会主义事业新局而，具有重大现实意义和深远历史意义。长汀航道各级党组织要把组织学习和贯彻落实十七大精神作为当前和今后一个时期的首要政治任务，迅速把干部职工的思想和行动统一到全会精神上来，     

海一鸥游艇公司携日本洋马公司共拓中国市场

海一鸥游艇有限公司是代理销售国外知名船艇并提供相关服务及设施的专营公司.海一鸥游艇有限公司注册于上海,分别在北京、大连、青岛、深圳设有分公司,在广州设有分销商.     

2007IEEE机电一体化与自动化国际会议开幕

由国家自然科学基金、王宽诚基金、美国电气电子工程师学会(IEEE)和日本香川大学等资助,哈尔滨工程大学承办的"2007IEEE机电一体化及自动化国际会议"8月6日在哈尔滨市香格里拉饭店开幕.来自中、美、日、韩、加等27个国家和地区的500余名代表出席会议,其中有近200名国外代表,国防科工委副主任金壮龙,黑龙江省委常委、省科技厅厅长孙尧出席大会并致辞.会议共收到来自33个国家和地区的投稿论文1861篇.经过国内外专家的严格审阅和定稿,最终录用701篇,采用率不到37%.     

打造民族知名品牌的三一港口机械——访三一港口机械公司彭国成总经理

<正>众所周知,三一重工股份有限公司是一家享有盛誉的上市公司,曾连续4年上榜中国最具价值品牌,是工程机械行业内的标志性企业之一。作为中国最具科研实力的工程机械制造商,三一重工拥有国家级技术中心、博士后工作站,并承接有国家863课题,取得专利400多项。三一重     

散货集装箱化的成因及发展趋势

0引言近年来全球集装箱运量的年增长率基本维持在10%以上,据初步统计2007年全球集装箱运量达1.3亿TEU,港口吞吐量达4.7亿TEU。随着集装箱制造、装卸工艺的改进,适箱货物的范围也在不断扩大。20世纪90年代,美国就开始采用集装箱运     

关于美国水域对船舶驱逐和控制的探讨

美国海岸警备队港口长官(COTP)或口岸当局(OCMI)对存在缺陷的船舶,根据缺陷的严重性,决定对这些船舶采取控制行动来保证船舶、港口和环境的安全,至于控制的程度、范围以及当局的执行力则和这些缺陷的本性一致.     

FPSO global strength and hull optimization

Global strength is a significant item for floatingproduction storage and offloading （FPSO） design, and steel weightplays an important role in the building costs of FPSO. It is the maintask to consider and combine these two aspects by optimizing hulldimensions. There are many optional methods for the globalstrength analysis. A common method is to use the ABS FPSOEagle software to analyze the global strength including the rulecheck and direct strength analysis. And the same method can beadopted for the FPSO hull optimization by changing the depth.After calculation and optimization, the results are compared andanalyzed. The results can be used as a reference for the futuredesign or quotation purpose.     

深水起重铺管船横摇运动性能分析(英文)

For a large floating vessel in waves,radiation damping is not an accurate prediction of the degree of roll unlike other degrees of freedom motion.Therefore,to get the knowledge of roll motion performance of deepwater pipelay crane vessels and to keep the vessel working safety,the paper presents the relationship between a series of dimensionless roll damping coefficients and the roll response amplitude operator(RAO).By using two kinds of empirical data,the roll damping is estimated in the calculation flow.After getting the roll damping coefficient from the model test,a prediction of roll motion in regular waves is evaluated.According to the wave condition in the working region,short term statistics of roll motion are presented under different wave parameters.Moreover,the relationship between the maximal roll response level to peak spectral wave period and the roll damping coefficient is investigated.Results may provide some reference to design and improve this kind of vessel.     

一种具有倾斜侧体的三体船阻力试验研究

作为一种高性能船型,三体船受到了研究人员的广泛关注。由于侧体位置对三体船剩余阻力会产生影响,为了研究倾斜侧体对三体船阻力性能的影响,设计了一种新型的倾斜侧体三体船,并在拖曳水池中开展了相应的船模阻力试验。试验中,针对这种新型的斜侧体三体船,采用船模拖曳的试验方法测量了不同装载情况侧体多个倾斜角度下的三体船裸船体阻力。而后,依据傅汝德假定对试验数据进行了计算,分析并讨论侧体倾斜角度对三体船剩余阻力的影响。试验结果表明,选择侧体合适的倾斜角度有利于降低三体船的航行阻力,为此类船型的设计尤其是快速性方面的研究和设计提供参考。     

中速三体船型PCC的可行性研究(英文)

In the present paper, a new trimaran Pure Car Carrier (PCC) is proposed and a feasibility study on the ship is carried out. In this study, first, the effective horse power (EHP)/car of the PCC running in still water is predicted. By comparing the predicted EHP/car with that of a conventional mono-hull PCC, it is found that the trimaran PCC is superior to the conventional mono-hull PCC at rather higher speed. As ship speed increases, the reduction of the resistance of the trimaran is bigger. It is also found that at common service speed of PCCs, the EHP/car of a small PCC is lower than that of a conventional PCC. Secondly, the optimal L/B of a main-hull of the trimaran PCC in still water is determined. The optimal L/B of the main-hull varies with ship speed and size because the wave resistance decreases but the frictional resistance increases as L/B of the hull increases. As ship size increases, the optimal L/B of the main-hull of the trimaran PCC decreases.     

超细长三体船在不规则波中的运动及载荷响应研究

以1艘超细长三体船为例,分析求解其在不规则波的运动及载荷响应。根据计算,对响应结果进行分析。计算结果表明超细长三体船片体较小,对船舶总纵弯矩及垂向剪力分布的影响较小。但由于船舶重心后移,总纵弯矩及垂向剪力的最大响应也略后移;计算得出的横向弯矩分布规律表明,三体船在船宽方向也可假设成两端简支的单跨梁,据此为校核三体船片体及主体连接结构提供依据。航速不同,导致三体船浮态不同。通过计算分析,得出适合示例三体船的最佳设计航速,可以为三体船设计提供帮助。     

超细长三体船阻力计算研究

主船体为超细长体,两侧配置两个小侧体而形成的三体船是一种很有潜力的新船型,近年来已引起了广泛的关注。本文对三体船的阻力原理进行了分析,以“相当平板”假设为基础计算摩擦阻力,采用“1＋k”的方法计算形状阻力;采用线性兴波阻力理论建立三体船的兴波阻力计算方法,提出了一套计算三体船阻力的完整方法。经与船模试验结果比较,采用本方法预报三体船的阻力,Cw的计算结果可以定性地反映侧体布置位置对三体船兴波阻力的影响,计算结果比较接近实际情况,具有一定的可靠性,可用于该船型的阻力预报。     

高速三体船结构设计

针对三体船的船型特点,进行了全船范围的结构设计,确定了关键部位的布局形式和结构尺寸以及主体和片体的连接形式。采用计算法设计了三体船的典型剖面结构,并采用规范校核验证了结构的合理性,最终形成了一套比较完整的三体船设计方案和结构评估方法。     

三体船侧体布局及型线优化设计研究

采用分层次优化,首先以总阻力最小为优化目标对某三体船侧体横向和纵向的相对位置进行了优化研究,得到阻力性能最优的三体船侧体布局方案;然后基于侧体最优布局,进行型线优化,最终完成三体船的侧体布局和型线的序列优化。结果表明,所采用的三体船侧体布局及型线优化方法具有可行性,可为三体船船型设计提供参考依据。     

三体船阻力模型试验

介绍了高速排水型三体船模型静水阻力试验。在Froude数0.3-0.8范围内进行了系列试验，研究侧体位置对阻力的影响，详细分析了三体船各船体之间的兴波干扰、剩余阻力曲线特征和阻力成分。通过阻力换算，对三体船、双体船和单体船的有效功率进行了比较，结果显示出三体船在阻力性能方面的巨大潜力。     

基于CFD的三体船侧体布局优化

三体船构型复杂,侧体布局对其阻力性能有很大的影响。基于计算流体动力学(Computational Fluid Dynamics, CFD)理论,利用SHIPMDO-WUT软件平台构建一种侧体布局自动优化方法。以某高速三体船为例,进行侧体布局的优化,结果表明:在4个不同弗劳德数下,优化船较母型船的兴波阻力均有所下降,总阻力也相应减小。得出在4个不同弗劳德数下总阻力最小的侧体布局方案,表明该方法的可行性与有效性。研究内容可为三体船减阻优化设计提供参考依据。     

三体船随浪中的完整稳性研究

随浪航行波峰位于船中时,容易引起单体船稳性的丧失,但是此结论对三体船是否适用尚待进一步研究。以一条三体船型为例,研究了三体船型在波浪中的完整稳性。对侧体不同位置的多种方案进行了计算。结果表明:当侧体纵向位置位于船舯、船尾和舯前(侧体横向位置较大)时,波浪中的初稳性较静水中反而有所增加,波浪中的大倾角稳性的最大复原力臂也比静水中有所增加,稳性消失角有所减小;当侧体纵向位置位于舯前(侧体的横向位置较小)时,波浪中的初稳性较静水中有所下降,波浪中大倾角稳性的最大复原力臂与静水中比较明显下降。     

侧体对称性对穿浪三体船阻力性能影响的试验研究（英文）

This paper presented the results of an experimental investigation into the resistance performance of a wave-piercing trimaran with three alternative side hull forms,including asymmetric inboard,asymmetric outboard,and symmetric at various stagger/separation positions.Model tests were carried out at the National Iranian Marine Laboratory(NIMALA) towing tank using a scale model of a trimaran at the Froude numbers from 0.225 to 0.60.Results showed that by moving the side hulls to the forward of the main hull transom,the total resistance coefficient of trimaran decreased.Findings,furthermore,demonstrated that the symmetry shape of the side hull had the best performance on total resistance among three side hull forms.Results of this study are useful for selecting the side hull configuration from the resistance viewpoint.