共查询到20条相似文献,搜索用时 78 毫秒
1.
DANG Kun SUN Pei-ting XIAO Jing-kun and SONG Yong-xin . Marine Engineering College Dalian Maritime University Dalian China . Environmental Science Technology College Dalian Maritime University Dalian China 《船舶与海洋工程学报》2006,(4)
1 Introduction1 The introduction of invasive marine species into new environments by ships’ ballast water, attached to ships’ hulls and via other vectors, has been identified by the Global Environment Facility (GEF) as one of the four greatest threats t… 相似文献
2.
Smoothed Particle Hydrodynamics (SPH) is a Lagrangian meshless particle method. However, its low accuracy of kernel approximation when particles are distributed disorderly or located near the boundary is an obstacle standing in the way of its wide application. Adopting the Taylor series expansion method and solving the integral equation matrix, the second order kernel approximation method can be obtained, namely K2_SPH, which is discussed in this paper. This method is similar to the Finite Particle Method. With the improvement of kernel approximation, some numerical techniques should be adopted for different types of boundaries, such as a free surface boundary and solid boundary, which are two key numerical techniques of K2_SPH for water wave simulation. This paper gives some numerical results of two dimensional water wave simulations involving standing wave and sloshing tank problems by using K2_SPH. From the comparison of simulation results, the K2_SPH method is more reliable than standard SPH. 相似文献
3.
东乡修平对商船三井是引以为豪的。因为包括扭任商船三井(中国)有限公司董事长、总经理之职,他已经为商船三井服务了27年。上个世纪70年代末,他从踏入商船三井,在大阪分公司扭当进口销售起步,先后在汽车运输、航线规划调度、海商法律以及油轮等部门与航运打了大半辈子交道。对此,东乡修平至今不悔,他对商船三井派他到中国上海来工作尤为乐意,因为上海是他就任的第三座海外城市,他曾经工作过的另两个海外城市远在欧洲的伦敦和南非的约翰内斯堡。说到上海,他说还是有些缘分的,此前就职于商船三井油轮部时,他便负责中国方面的业务,并曾多次造访中国的石油公司,与之建立了良好的合作关系,还促成了商船三井与中外运在油轮业务中的合作投资。如今,在上海已经工作5年的他,对中国航运和市场环境有了更深切的理解,不事张扬的性格中却透现出对事业的信心和执着。[编者按] 相似文献
4.
We review recent advances in the finite element method (FEM) simulations of interactions between waves and structures. Our focus is on the potential theory with the fully nonlinear or second-order boundary condition. The present paper has six sections. A review of previous work on interactions between waves and ocean structures is presented in Section one. Section two gives the mathematical formulation. In Section three, the finite element discretization, mesh generation and the finite element linear system solution methods are described. Section four presents numerical methods including time marching schemes, computation of velocity, remeshing and smoothing techniques and numerical radiation conditions. The application of the FEM to the wave-structure interactions are presented in Section five followed by the concluding remarks in Section six. 相似文献
5.
6.
The water entry problem of an asymmetric wedge with roll motion was analyzed by the method of a modified Logvinovich model (MLM). The MLM is a kind of analytical model based on the Wagner method, which linearizes the free surface condition and body boundary condition. The difference is that the MLM applies a nonlinear Bernoulli equation to obtain pressure distribution, which has been proven to be helpful to enhance the accuracy of hydrodynamic loads. The Wagner condition in this paper was generalized to solve the problem of the water entry of a wedge body with rotational velocity. The comparison of wet width between the MLM and a fully nonlinear numerical approach was given, and they agree well with each other. The effect of angular velocity on the hydrodynamic loads of a wedge body was investigated. 相似文献
7.
8.
有限状态机是实现智能车辆状态间转换的一种重要的方法,对其理论的理解,有助于更好的设计智能车辆的状态和实现各种状态间的相互转换.本文先介绍了有限状态机的理论,然后利用有限状态机的理论设计智能车辆的各种状态,最后实现各状态间的相互转换. 相似文献
9.
广州港是华南地区综合性主枢纽港。在腹地经济持续快速发展的推动下,广州港货物吞吐量持续增长。1999年全港货物吞吐量突破1亿吨,成为中国大陆第二个跨入世界亿吨大港的港口。2004年2月26日经广州市人民政府批准,广州港集圆有限公司成立,从此,港口生产和建设一年一大步:2007年9月广州港南沙港区二期建成投产,标志着广州港实现从集装箱支线港向集装箱干线港的跨越式发展,目前,南沙港区已初步形成了以集装箱、油品、汽车为主要货类的专业化深水码头格局。2008年广州港集团货物吞吐量达2.4亿吨,集装箱吞吐量达865.5万标准箱。2008年广州港集团荣获国家“五一劳动奖状”,是广州地区唯一荣获该殊荣的企业。 相似文献
10.
2006年11月,日照港年货物吞吐量突破亿吨,成为全国沿海第9个、山东省第2个亿吨港。此时,距离日照港正式开港开放的1986年,恰好过去了20年。开港20年,成就一个亿吨港,这在中国港口乃至世界港口发展史上,可谓凤毛麟角。是什么支撑了一个年轻的日照港港演绎了如此壮阔的一幕?她未来的发展还将演绎怎样的奇迹?为此记者采访了日照港(集团)有限公司董事长、党委书记杜传志先生。 相似文献
11.
12.
13.
根据现行给水排水设计规范、海港工程设计手册,对港口码头给水系统设计、系统用水贮水量、水压、水质提出自己的浅见,希望能对港口码头给水系统设计以及系统优化设计起到积极的作用。 相似文献
14.
15.
16.
17.
通过对目前我县农村饮水安全存在的相关问题的分析,提出了解决农村饮水安全问题的总体思路。可以通过科学规划,集中供水等工程措施和完善管理等非工程措施有效提高农村饮用水安全标准。 相似文献
18.
19.