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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. 相似文献
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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, 相似文献
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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 相似文献
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<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 相似文献
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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. 相似文献
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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. 相似文献
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由丹丹;孙丽萍;曲治国;王涛 《船舶与海洋工程学报》2013,12(4):459-462
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. 相似文献
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Study of the ship design process model for collaborative design 总被引:1,自引:0,他引:1
HE Ze QIU Chang-hua WANG Neng-jian 《船舶与海洋工程学报》2005,4(3):24-29
The ship design process model is the basis for developing the ship collaborative design system under network environment. According to the characteristics of the ship design, a method for dividing the ship design process into three layers is pat forward, that is project layer, design task layer and design activity layer, then the formalized definitions of the ship design process model, the decomposing principles of the ship design process and the architecture of the ship collaborative design (SDPM) system are presented. This method simplifies the activity network, makes the optimization and adjustment of the design plan convenient and also makes the design process easier to control and change, at last the architecture of the ship collaborative design system is discussed. 相似文献
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住宅不能脱离环境孤立存在,因此住宅设计必须认真研究,精心进行环境设计。本文针对住宅设计中环境设计的若干问题进行了分析和阐述,文章着重探讨了环境设计中一系列环境要素之间的关联、渗透以及设计原则,包括大与小,内与外,软与硬,封闭与开放,分设与共享等。 相似文献
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改进《机械设计基础》课程设计之探讨 总被引:5,自引:0,他引:5
总结多年教学实践并结合当今教学改革趋势,提出了改进该课程设计的见解,望引起同仁的重视,并对提高《机械设计》课程设计质量进行更深入地探讨。 相似文献
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针对舵装置的传统设计方法在保证可靠性上存在的问题,提出对舵装置可靠性设计的重要性.通过对舵装置的可靠性分析,以舵杆为例详细介绍了与传统设计相结合的可靠性设计方法. 相似文献
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通过对城市滨水景观设计的介绍,以及景观设计和生态环境、人们居住环境的分析,同时相结合我国城市滨水建筑设计中存在的问题,提出了城市滨水建筑设计应遵循“生态景观设计、人文景观设计”的设计思想,并给出了四条具体的设计原则。 相似文献
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通过运用多学科设计、分析、优化工具对产品进行数字化设计,提出了虚拟产品多学科设计的总体框架,阐述了总体框架的构成及功能,并对软件框架进行细致的分析,初步探讨了虚拟产品设计中多学科集成优化设计的理论和方法,具有一定的参考意义。 相似文献
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当前港口工程勘察设计仍然以分散作业、单机操作,各专业独立完成,以图纸、表格、文字互提资料的二维
的、离散的作业模式为主,该作业模式不但效率低,资料共享性差,而且错漏现象时有发生。因此,提出全新的港口工程
勘察设计一体化智能化作业模式。该作业模式以三维模型设计为基础,整合各专业生产流程,实现港口工程勘察设计行业
全专业的三维设计,全生产流程的无缝数据连接,可定制的自动化分析,可定制的自动化成果输出和多专业协同设计。此
外,给出实现该作业模式的系统设计,该设计把系统分成基础层,应用层,业务层3个层次,兼顾了三维工程设计的通用性
和专用性,不但根据系统层次实现了良好的架构分离,而且为系统不同层次的扩展提供了基础。 相似文献
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通过对《MARPOL73/78》公约、中国船级社(CCS)的环保附加标志"CLEAN"和"CLEAN(FTP,GWC,NEC,SEC,RSC,AFS,GPR)"要求的分析,在与目前我国舰船绿色环保设计现状进行对比的基础上,提出了今后舰船绿色环保设计的发展方向。 相似文献