Computation of Design Load and Motion for Floating Structures Navigating in Waves   总被引：1，自引：0，他引：1  

WANG Yanying  ZHU Renchuan  MIAO Jie Professor  School of Naval Architecture  Marine Engineering  Dalian University of Technology 《中国海洋工程》1999,(1)

—Analytical and numerical investigation is made of the source potential for floating structurewith forward speed in waves.A particular form is selected for numerical applications,where the double in-tegral of the Green function is transformed into the single one and the oscillation characteristics forintegrands in the specific computation domain are treated numerically.A comparison of calculated exam-p1es with published data is given and it shows that the numerical simulation is satisfactory and the accura-cy is adequate to engineering application.  相似文献   

Study on Hydrodynamic Characteristics of Pipelines in Open Trenches     

ZHANG Rixiang XING Zhizhuang GUO Jianjiang Associate Professor  Dept. of Civil Engineering  Dalian University of Technology  Dalian  P. R. China Professor  Dept. of Civil Engineering  Dalian University of Technology  Dalian  P. R. China Master  Dept. of Civil Engineering  Dalian University of Technology  Dalian  P. R. China 《中国海洋工程》1999,(4)

Based on hydrodynamic model tests,the relationship between relative hydrodynamic coefficientand cycle coefficient K_c is obtained by introducing the relative trench shape coefficient α_r;there is a goodrelation for the shallow trench.According to α_r of the designed trench shape and pre-chosen K_c,the reduc-tion coefficient and sheltering effect can be decided by the result provided in this paper.  相似文献   

Experimental Study of Wave Pressure on a Breakwater Pier     

PAN Shaohua XIAQiyi LIN Shiqing XU Lunhuan Professor  Dept. of Coastal Engineering  College of Harbour  Waterway  Coastal Engineering  Hohai University  Nanjing  P. R. China. Senior Engineer  Dept. of Coastal Engineering  College of Harbour  Waterway  Coastal Engineering  Hohai University  Nanjing  P. R. China. Senior Engineer  Fujian Province Ports  Shipping Administration Bureau  Fuzhou  P. R. China. 《中国海洋工程》1999,(2)

Test studies on the wave pressure on a breakwater pier show that the influence of transmissivewave pressure on the outside wall of the breakwater pier is considerable,when the width of the pier is notvery large.The variations of transmissive wave pressure on the breakwater pier with different widths arecompared and the relationship is obtained between relative transmitting distance b/L and wave pressurereduction factor K,which may be used in the design of similar breakwater piers.  相似文献   

Ultimate Compressive Strength Prediction for Stiffened Panels by Counterpropagation Neural Networks (CPN)     

WEI Dong  ZHANG Shengkun Ph.D. Candidate  School of Naval Architecture  Ocean Engineering  Shanghai Jiao Tong University  Shanghai  P. R. China Professor  School of Naval Architecture  Ocean Engineering  Shanghai Jiao Tong University  Shanghai  P. R. China 《中国海洋工程》1999,(3)

Stiffened Panels are important strength members in ship and offshore structures,A new methodbased on counterpropagation neural networks(CPN)is proposed in this paper to predict the ultimate compres-sive strength of stiffened panels.Compared with two-parametric polynomial,this method can take more pa-rameters into account and make more use of experimental data.Numerical study is carried out to verify thevalidation of this method.The new method may find wide application in practical design.  相似文献   

论岩体表征单元体积REV岩体力学参数取值的一个基本问题   总被引：12，自引：0，他引：12  

周创兵  於三大 《工程地质学报》1999,7(4):332-336

本文论述了岩体力学性质的尺寸效应,提出了与岩体弹性参数相应的表征单元体REV的力学描述,根据中心极限定理推导了估算裂隙岩体REV 的数学表达式。研究表明,岩体表征单元体的大小是岩体力学性质尺寸效应的客观反映。本研究成果为合理选取岩体力学参数提供了一条新途径。  相似文献   

Wave-Current Propagation over a Frictional Topography   总被引：1，自引：0，他引：1  

ZUO Qihua  DING Bingcan Prof. Senior Engineer  River  Harbour Department  Nanjing Hydraulic Research Institute 《中国海洋工程》1998,(4)

—In this paper the parabolic approximation model based on mild-slope equation is used tostudy wave propagation over a slowly varying and frictional topography under wave-current interaction.A governing equation considering the friction effects is derived by the authors for the first time.A simpli-fied form for the rate of wave energy dissipation is presented on the basis of the wave-current action conser-vation equation and the bottom friction model given by Yoo and O＇connor(1987).Examples reveal thatthe present computational method can be used for the calculation of wave elements for actual engineeringprojects with large water areas.  相似文献   

Dynamic Plastic Response of Circular Plates Resting on Fluid with Finite Deformation     

Wang Gang  Li Zhen  Chen Tieyun Ph. D.  Marine Design  Research Institute of China  Shanghai Engineer  Marine Design  Research Institute of China  Shanghai Professor  Dept. of Naval Architecture  Ocean Engineering  Shanghai Jiao Tong University  Shanghai 《中国海洋工程》1998,(1)

This paper concerns the dynamic plastic response of a circular plate resting on fluid subjectedto a uniformly distributed rectangular load pulse with finite deformation.It is assumed that the fluid isincompressible and inviscous,and the plate is made of rigid-plastic material and simply supported along itsedge.By using the method of the Hankel integral transformation,the nonuniform fluid resistance is de-rived as the plate and the fluid is coupled.Finally,an analytic solution for a circular plate under a mediumload is obtained according to the equations of motion of the plate with finite deformation.  相似文献   

An Experimental Investigation on Wave Loading on a Platform Mat     

Miao Guoping  Yao Meiwang  Zhang Chengyi  Ji Chunqun Professor  School of Naval Architecture  Ocean Engineering  Shanghai Jiao Tong University  Shanghai Senior Engineer  School of Naval Architecture  Ocean Engineering  Shanghai Jiao Tong University  Shanghai Engineer  School of Naval Architecture  Ocean Engineering  Shanghai Jiao Tong University  Shanghai 《中国海洋工程》1998,(1)

Overall wave loading and local hydrodynamic pressure distributions on a platform mat in reg-ular waves for shallow waters are experimentally investigated in order to examine the severity of thenonlinear effects and shallow water effects.Wave focusing phenomenon is observed in the tests.The meas-ured results may also provide a comparison basis for the theoretical development to consider the nonlinearinteraction between waves and viscous flow by introducing viscosity into wave theories.  相似文献   

A Numerical Model for Typhoon Surges     

PAN Junning  WANG Hongchuan  YAO Guoquan Graduate Student  River  Harbour Department  Nanjing Hydraulic Research Institute  Nanjing  P. R. China.Engineer  River  Harbour Department  Nanjing Hydraulic Research Institute  Nanjing  P. R. China. Professor  River  Harbour Department  Nanjing Hydarulic Research Institute  Nanjing  P. R. China. 《中国海洋工程》1998,(2)

-In this paper a simple and efficient implicit finite-difference scheme is used for depth-averagedtwo-dimensional storm surge model.This finite-difference scheme is simpler and more efficient than the wi-dely-used ADI scheme.Accuracy analysis and stability analysis indicate that the scheme has two-order ac-curacy and is unconditionally stable when the grid size is constant.The present analysis results show thatthe scheme is of higher numerical accuracy than that introduced by Maa(1990).After tested by ideal mod-els,a calculation example of a real typhoon surge is carried out,the results of the numerical simulation co-incide well with the observed data and the accuracy is sufficient for engineering applications.  相似文献   

西沙海槽研究区天然气水合物地球化学勘探   总被引：17，自引：1，他引：16  

孙春岩王宏语  牛滨华黄新武 《地球科学》2004,29(2):135-140

天然气水合物研究涵盖了地球物理、地球化学和地质等多门学科, 其中勘查地球化学方法技术可以从海底介质中获得与天然气水合物有关的痕量地球化学信息, 圈定水合物异常区域.依据2000年和2001年在中国南海西沙海槽工作区天然气水合物地球化学现场快速勘查实测和室内分析测试的多种烃类结果, 获得了海上工作区气态烃地球化学异常分布, 以及与该区水合物地震BSR和BZ的对比分析评价结果.同时根据现场实测同位素数据, 探讨了工作区形成水合物气态烃甲烷的成因.研究成果为工作区天然气水合物勘探提供了地球化学方面的直接证据.   相似文献