The Open Ocean Engineering Journal最新文献

Deflection of a Web-Core Sandwich Beam in Weak Direction 网芯夹层梁弱方向挠度分析

The Open Ocean Engineering Journal Pub Date : 2013-12-30 DOI: 10.2174/1874835X01306010082

Yang Jie

引用次数: 0

Prediction on Deflection of Z-Core Sandwich Panels in Weak Direction z芯夹层板弱方向挠度预测

The Open Ocean Engineering Journal Pub Date : 2013-12-30 DOI: 10.2174/1874835X01306010088

Chen Cheng

{"title":"Prediction on Deflection of Z-Core Sandwich Panels in Weak Direction","authors":"Chen Cheng","doi":"10.2174/1874835X01306010088","DOIUrl":"https://doi.org/10.2174/1874835X01306010088","url":null,"abstract":"In a Z-core sandwich panel, the shear stiffness of the sandwich panel in the weak direction which is perpen- dicular to the placement of the Z-cores is much smaller than the bending stiffness because the hollow section between the two facing plates cannot sustain shear action. Because of this fact, the shear deformation of a Z-core sandwich panel under bending in the weak direction cannot be ignored. Although the flexural deformation of a Z-core sandwich panel can be calculated simply from beam theory, the shear deformation is much more difficult to calculate due to the mutual action between the facing plates and the Z-core stiffener. Considering the contact between the Z-core flanges and the facing plates, the shear deformation of a typical segment in a Z-core sandwich panel is analyzed based on compatibility condi- tions. By using Castigliano's second theorem, the equations for calculating the deflection caused by shear action of a Z- core sandwich panel under bending in weak direction are obtained. The overall deflection of the Z-core sandwich panel is superposed by the deflections caused by flexural and shear actions respectively. The accuracy of the presented equations for calculating the deflection of a Z-core sandwich panel is finally verified by comparing the predicted results with ex- perimental results reported in corresponding reference. It is found that the predicted results from the presented equation agree quite well with experimental results, which shows the reliability and accuracy of the proposed equations.","PeriodicalId":206173,"journal":{"name":"The Open Ocean Engineering Journal","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127984405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prediction on Deflection of Truss-Core Sandwich Panels in Weak Direction 桁架芯夹芯板弱方向挠度预测

The Open Ocean Engineering Journal Pub Date : 2013-12-30 DOI: 10.2174/1874835X01306010065

Wan Yamin, Shao Yong-bo, Liu Yu-kai

引用次数: 0

Editorial-Deflection Of Steel-Core Sandwich Panels In Weak Direction 钢芯夹芯板在弱方向的挠度

The Open Ocean Engineering Journal Pub Date : 2013-12-30 DOI: 10.2174/1874835X01306010041

Shao Yong-bo

引用次数: 0

Prediction on Deflection of Box-Core Sandwich Panels in Weak Direction 箱芯夹芯板弱方向挠度预测

The Open Ocean Engineering Journal Pub Date : 2013-12-30 DOI: 10.2174/1874835X01306010042

Cui Mingjuan

{"title":"Prediction on Deflection of Box-Core Sandwich Panels in Weak Direction","authors":"Cui Mingjuan","doi":"10.2174/1874835X01306010042","DOIUrl":"https://doi.org/10.2174/1874835X01306010042","url":null,"abstract":"In a C-core sandwich panel, the shear stiffness of the sandwich panel in the weak direction is much smaller. The deflection of a C-core sandwich beam consists of two parts: flexural deformation and shear deformation. The flexural deformation of a C-core sandwich beam can be calculated simply from beam theory while the shear deformation is rela- tively difficult to calculate due to the mutual action between the facing plates and the C-core stiffener. Considering the contact between the flanges of the C-core and the facing plates, the shear deformation of a typical segment in a C-core sandwich panel is analyzed based on compatibility conditions. By using Castigliano's second theorem, the equation for calculating the deflection caused by shear action of a C-core sandwich panel under bending is obtained. The accuracy of the presented equations for calculating the deflection of a C-core sandwich cantilever beam and a C-core sandwich panel under three-point bending is then verified by comparing with finite element and experimental results reported in the corre- sponding reference. It is found that the predicted results from the presented equation agree quite well with finite element and experimental results, which shows the reliability and accuracy of the proposed equation.","PeriodicalId":206173,"journal":{"name":"The Open Ocean Engineering Journal","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122039371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advances in study of mechanical properties of gas hydrate-bearing sediments 含天然气水合物沉积物力学性质研究进展

The Open Ocean Engineering Journal Pub Date : 2013-10-18 DOI: 10.2174/1874835X01306010026

鲁晓兵, 张旭辉, 王淑云

{"title":"Advances in study of mechanical properties of gas hydrate-bearing sediments","authors":"鲁晓兵, 张旭辉, 王淑云","doi":"10.2174/1874835X01306010026","DOIUrl":"https://doi.org/10.2174/1874835X01306010026","url":null,"abstract":"Gas hydrate (GH) is defined as the crystalline solid, or clathrate hydrate, which are formed by some kinds of low mass molecular gases, such as methane, carbon dioxide, and hydronitrogen, with water at relatively high pressure and low temperature conditions. Gas hydrate-bearing sediments (HBS) are some sand, clay and mixed sediment containing gas hydrates. Advances in the study on the mechanical properties of HBS are summarized mainly in aspects of the laboratory test, in-situ investigation, and theoretical model. Firstly, the main factors are discussed including the structure of GH, formation method and matrix characteristics of HBS; Secondly, progress on the laboratory tests and results are discussed, which mainly includes the tri-axial tests with the natural and synthesized HBS samples, the acoustic tests for measuring the elastic coefficients, the tests for investigating the effects of main factors such as the gas and water contents and soil types on the strength of HBS. Thirdly, for in-situ investigations, including the geophysical surveying, in-situ tests (such as downhole tests) and results are summarized; Fourthly, several theoretical models for estimating the mechanical properties of HBS are introduced; At last, the emphases and the tendency in the future study on the mechanical properties of HBS are discussed.","PeriodicalId":206173,"journal":{"name":"The Open Ocean Engineering Journal","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132389980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Extended Serre Equations for Applications in Intermediate Water Depths 扩展Serre方程在中等水深中的应用

The Open Ocean Engineering Journal Pub Date : 2013-08-28 DOI: 10.2174/1874835X01306010016

J. D. Carmo

{"title":"Extended Serre Equations for Applications in Intermediate Water Depths","authors":"J. D. Carmo","doi":"10.2174/1874835X01306010016","DOIUrl":"https://doi.org/10.2174/1874835X01306010016","url":null,"abstract":"The Serre or Green and Naghdi equations are fully-nonlinear and weakly dispersive and have a built-in as- sumption of irrotationality. However, like the standard Boussinesq equations, also Serre's equations are only valid for long waves in shallow waters. To allow applications in a greater range of h 0 /l, where h 0 and l represent, respectively, depth and wavelength characteristics, a new set of extended Serre equations, with additional terms of dispersive origin, is developed and tested in this work by comparisons with available experimental data. The equations are solved using an ef- ficient finite-difference method, which consistency and stability are analyzed by comparison with a closed-form solitary wave solution of the Serre equations. All cases of waves propagating in intermediate water depths illustrate the good per- formance of the extended Serre equations with additional terms of dispersive origin. It is shown that the computed results are in conformity with the analytical ones and test data. An equivalent form of the Boussinesq type equations, also with improved linear dispersion characteristics, is solved using a numerical procedure similar to that used to solve the extended Serre equations.","PeriodicalId":206173,"journal":{"name":"The Open Ocean Engineering Journal","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127084140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Static Strength of Circular Tubular T-joints with Inner Doubler PlateReinforcement Subjected to Axial Compression 轴压作用下带内加厚板的t形圆管接头的静强度

The Open Ocean Engineering Journal Pub Date : 2013-02-22 DOI: 10.2174/1874835X01306010001

H. Shubin, Shao Yong-bo, Z. Hongyan

引用次数: 7

Development of Partial Environmental Load Factor for Design of Tubular Joints of Offshore Jacket Platforms in Malaysia 马来西亚海上导管架平台管状接头设计中局部环境荷载系数的研究进展

The Open Ocean Engineering Journal Pub Date : 2013-02-22 DOI: 10.2174/1874835X01306010008

N. J. Cossa, N. S. Potty, M. S. Liew

引用次数: 6

Simulation of Return Flow in Restricted Navigation Channel for Barge-tow Movements 驳船拖曳运动受限航道返流模拟

The Open Ocean Engineering Journal Pub Date : 2012-11-16 DOI: 10.2174/1874835X01205010034

S. Das, Samir Kumar Das, J. N. Kariya

{"title":"Simulation of Return Flow in Restricted Navigation Channel for Barge-tow Movements","authors":"S. Das, Samir Kumar Das, J. N. Kariya","doi":"10.2174/1874835X01205010034","DOIUrl":"https://doi.org/10.2174/1874835X01205010034","url":null,"abstract":"Simulations of barge-tow movement in the sub-critical range along the Illinois River near Kampsville are performed to determine the return flow (RF) characteristics for upstream and downstream bound barge-tows. Simulations are carried out using the OpenFOAM® based CFD software for six barge-tow configurations considering two-dimensional shallow water equation. The RF velocities are simulated for 0s to 100s at an interval of 10s at nine different locations, taken across the river from vessel to bank for upstream and downstream bound barge-tows. The computed RF velocities at these points between the bow and the bank are analyzed and compared with the observed field data for identical conditions. The simulated RF velocity agrees well with the computed RF velocity of Hochestein and Adams, and Maynord and Siemsen, except closer to the barge-tow. Model simulation shows that the RF profiles (lateral velocity distributions transverse to vessel movement) vary with time and the length of the vessel. To understand the associated phenomena, drawdown and squat are computed using empirical formulations given by earlier researchers. The simulated result clearly indicates the location of the zero velocity point for downstream bound barge-tows. The present study would be helpful to hydraulic engineers, planners and biologists to predict RF hydrodynamic in a restricted channel.","PeriodicalId":206173,"journal":{"name":"The Open Ocean Engineering Journal","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121981981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6