检索结果-南通市图书馆

土体强度折减对海上升压站结构抗震设计的影响

在线全文

学校读者我要写书评

暂无评论

船海工程 2024年第3期53卷 78-83页

作者：廖望焦钰祺姜娟陈立乔东生上海勘测设计研究院有限公司上海200335 大连理工大学水利工程博士后流动站辽宁大连116024 大连理工大学海岸和近海工程国家重点实验室辽宁大连116024

通过有限元非线性时程分析,对比API规范法与考虑土体强度折减作用后某海上升压站桩基及上部平台结构的水平向应力与变形等主要设计指标,结果表明,考虑土体强度折减后,土体对于桩基的水平向约束力减弱,单桩的变形与受力均出现大幅增加,... 详细信息

通过有限元非线性时程分析,对比API规范法与考虑土体强度折减作用后某海上升压站桩基及上部平台结构的水平向应力与变形等主要设计指标,结果表明,考虑土体强度折减后,土体对于桩基的水平向约束力减弱,单桩的变形与受力均出现大幅增加,且上部结构的整体水平运动特征更为显著,使用API规范计算上部平台结构的应力结果偏保守,建议在海上升压站的桩基础设计时根据场地土的特性选取土体强度折减模型并着重校核桩基础的关键设计指标。

关键词：海上升压站桩-土相互作用强度折减抗震设计有限元分析非线性时程分析

考虑不同桩-土相互作用模型的海上升压站抗震性能分析

在线全文

学校读者我要写书评

暂无评论

船海工程 2024年第2期53卷 108-114页

作者：廖望焦钰祺姜娟陈立王李吉乔东生上海勘测设计研究院有限公司上海200335 大连理工大学水利工程博士后流动站辽宁大连116024 大连理工大学海岸和近海工程国家重点实验室辽宁大连116024

由于海上升压站上部平台设有许多大质量专业设备,使其呈现“头重脚轻”的特征,直接借鉴传统海洋平台的设计方法难以准确评价海上升压站结构的承载能力与变形能力,其中桩-土相互作用对于地震作用下的结构动力响应分析的影响尤为显著。以... 详细信息

由于海上升压站上部平台设有许多大质量专业设备,使其呈现“头重脚轻”的特征,直接借鉴传统海洋平台的设计方法难以准确评价海上升压站结构的承载能力与变形能力,其中桩-土相互作用对于地震作用下的结构动力响应分析的影响尤为显著。以国内某位于地震高烈度区的海上升压站为对象,分别基于等效线性桩长法、API规范p-y曲线法、修正p-y曲线法建立3种不同考虑桩-土相互作用的计算模型,对比中震作用下结构的抗震性能。结果表明,基于3种模型校核该海上升压站结构均符合抗震设防要求;海上升压站结构受竖向地震作用影响较明显;在砂土层占比较高的地基条件下,使用修正p-y曲线方法可以更合理地模拟桩-土相互作用。

关键词：海上升压站桩-土相互作用抗震性能有限元分析反应谱分析非线性时程分析

An Improved Method of Predicting Drag Anchor Trajectory Based on the Finite Element Analyses of Holding Capacity

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2020年第1期34卷 1-9页

作者： qiao dong-sheng GUAN Bo LIANG Hai-zhi NING De-zhi LI Bin-bin OU Jin-ping State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China School of Civil Engineering Qingdao University of TechnologyQingdao 266520China Sortec Offshore Pte.Ltd. 677670Singapore

Drag anchor is one of the most commonly used anchorage foundation types. The prediction of embedded trajectory in the process of drag anchor installation is of great importance to the safety design of mooring system. In this paper, the ultimate anchor holding capacity in the seabed soil is calculated through the established finite element model, and then the embedded motion trajectory is predicted applying the incremental calculation method. Firstly, the drag anchor initial embedded depth and inclination angle are assumed, which are regarded as the start embedded point. Secondly, in each incremental step, the incremental displacement of drag anchor is added along the parallel direction of anchor plate, so the displacement increment of drag anchor in the horizontal and vertical directions can be calculated. Thirdly, the finite element model of anchor is established considering the seabed soil and anchor interaction, and the ultimate drag anchor holding capacity at new position can be obtained. Fourthly, the angle between inverse catenary mooring line and horizontal plane at the attachment point at this increment step can be calculated through the inverse catenary equation. Finally, the incremental step is ended until the angle of drag anchor and seabed soil is zero as the ultimate embedded state condition, thus, the whole embedded trajectory of drag anchor is obtained. Meanwhile, the influences of initial parameter changes on the embedded trajectory are considered. Based on the proposed method, the prediction of drag anchor trajectory and the holding capacity of mooring position system can be provided.

关键词： drag anchor embedded trajectory prediction increment calculation holding capacity

Influence of Active Control Strategy on the Motion Compensation at the Truncated Point of Mooring Line

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2021年第5期35卷 700-711页

作者： qiao dong-sheng YIN Li YAN Jun TANG Wei NING De-zhi LI Bin-bin OUJin-ping State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China

The maximum predicting error of the commonly used passive truncated mooring system method may reach 30%due to the difference of dynamic characteristics between the truncated and full-depth mooring *** this paper,the experimental strategy called three-parameter(displacement,velocity and acceleration)active control method at the truncated point of mooring line is established to implement the synchronous equivalent of motion and force,and the realization of active truncated mooring system for model test is studied *** influences of threeparameter and one-parameter(displacement)active control strategies on the compensation effects are compared by numerical *** results show that the established three-parameter active control method can feasibly realize the static and dynamic equivalent of truncated and full-depth mooring system,laying a good foundation for the following physical model test of active truncated mooring system.

关键词： mooring system active truncated model test three-parameter control method motion and force equivalence

基于CDIO理念的海洋工程专业研究生工程实践能力培养体系建设

在线全文

学校读者我要写书评

暂无评论

教育教学论坛 2024年第9期 172-176页

作者：唐国强乔东生吕林闫晓惠大连理工大学港航与海洋工程学院辽宁大连116024

随着新时期海洋工程产业的快速发展,对海洋工程领域的专业人才提出了日益严格的要求,多学科的知识储备和出色的工程实践能力已成为不可或缺的素养。针对目前海洋工程专业研究生工程实践能力培养体系建设方面存在的一些不足之处,在CDIO... 详细信息

随着新时期海洋工程产业的快速发展,对海洋工程领域的专业人才提出了日益严格的要求,多学科的知识储备和出色的工程实践能力已成为不可或缺的素养。针对目前海洋工程专业研究生工程实践能力培养体系建设方面存在的一些不足之处,在CDIO理念的导向下,围绕实验平台建设、校企实践合作及科技创新训练三个方面,提出了一套研究生工程实践能力培养体系的改进方案。这些改进方案对于国内众多高校海洋工程专业研究生培养体系的建立具有直接参考价值,并为其他专业领域教学改革提供了示范和辐射推广作用。

关键词：研究生培养海洋工程 CDIO教学理念创新能力工程实践能力

Atomistic study of inverse size effect induced by interfacial plasticity in pearlitic multi-principal element alloy

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第7期43卷 3341-3355页

作者： Chen Yang qiao-sheng Xia Cun-Hong Yin dong-Peng Hua College of Mechanical Engineering Guizhou UniversityGuiyang 550025China Key Laboratory of Advanced Manufacturing Technology Ministry of EducationGuizhou UniversityGuiyang 550025China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi'an 710072China

Owing to the fine nano-laminated structure,the pearlitic multi-principal element alloy(PMPEA) exhibits excellent mechanical and tribological ***,the incomplete understanding of the size effect of its lamella thickness and the unclear understanding of the plasticity-interface interaction mechanism limit further optimization of *** this study,the FeCoNi/Ni_3Ti interface-mediated plastic deformation behavior in PMPEA and the variation of mechanical and tribological properties with lamella thickness within the nanoscale range using molecular dynamics(MD) simulation were *** results indicate that the mechanical and tribological properties of the PMPEA with lamella thicknesses below 10 nm have a significant inverse size effect,i.e.,the smaller the lamella thickness,the weaker the *** is because the plastic carrier-interface interaction mechanism changes from a strengthening mechanism that hinders dislocations to a weakening mechanism that promotes dislocations with the decreases in the lamella thickness,and the weakening effect becomes more pronounced as the lamella thickness decreases and the number of interfaces *** particular,the deformation behavior of Ni_3Ti lamellae changes from crystal-like to amorphous-like with decreasing ***,in the sample with larger lamella thickness,the occurrence of hierarchical slips in the body-centered cubic(BCC) phase due to the multiprincipal elements effect can better alleviate the stress concentration caused by the dislocation accumulation at the interface,so that the phase interface exhibits outstanding load-bearing *** the dislocation pattern in BCC phase shows a firm high-density cell,which makes the substrate exhibit a stable tribological response.

关键词： Multi-principal element alloy Nano-laminated structure Molecular dynamics simulation Nanoindentation and nanoscratch

Recent advances in promising drugs for primary prevention of gastroesophageal variceal bleeding with cirrhotic portal hypertension

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2024年第1期23卷 4-13页

作者： Ji-Yao sheng Zi-Fan Meng qiao Li Yong-sheng Yang Department of Hepatobiliary and Pancreatic Surgery the Second Hospital of Jilin UniversityChangchun 130041China Jilin Engineering Laboratory for Translational Medicine of Hepatobiliary and Pancreatic Diseases the Second Hospital of Jilin UniversityChangchun 130041China

Background:Gastroesophageal variceal bleeding is one of the most severe complications of patients with *** primary prevention drugs,including non-selectiveβ-blockers,have effectively reduced the incidence of bleeding,their efficacy is limited due to side effects and related *** recent advances in precision medicine,precise drug treatment provides better treatment *** sources:Literature search was conducted in PubMed,MEDLINE and Web of Science for relevant articles published up to May *** on clinical trials was obtained from https://***/and http://***/.Results:The in-depth understanding of the pathogenesis and advances of portal hypertension has enabled the discovery of multiple molecular targets for promising *** to the site of action,these drugs could be classified into four classes:intrahepatic,extrahepatic,both intrahepatic and extrahepatic targets and *** these classes of drugs offer advantages over traditional treatments in prevention of gastroesophageal variceal bleeding in patients with cirrhotic portal ***:This review classified and summarized the promising drugs,which prevent gastroesophageal variceal bleeding by targeting specific markers of pathogenesis of portal hypertension,demonstrating the significance of using the precision medicine strategy to discover and develop promising drugs for the primary prevention of gastroesophageal variceal bleeding in patients with cirrhotic portal hypertension.

关键词： Cirrhotic portal hypertension Target drug Primary prevention Bleeding

Atomic-Scale Insights into Damage Mechanisms of GGr15 Bearing Steel Under Cyclic Shear Fatigue

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1265-1278页

作者： qiao-sheng Xia dong-Peng Hua Qing Zhou Ye-Ran Shi Xiang-Tao Deng Kai-Ju Lu Hai-Feng Wang Xiu-Bing Liang Zhao-dong Wang State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an710072China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819China Defense Innovation Institute Academy of Military ScienceBeijing100071China

Alternating shear stress is a critical factor in the accumulation of damage during rolling contact fatigue,severely limiting the service life of ***,the specific mechanisms responsible for the cyclic shear fatigue damage in bearing steel have not been fully *** the mechanical response and microstructural evolution of a model GGr15 bearing steel under cyclic shear loading are investigated through the implementation of molecular dynamics *** samples undergo 30 cycles under three different loading conditions with strains of 6.2%,9.2%,and 12.2%,*** findings indicate that severe cyclic shear deformation results in early cyclic softening and significant accumulation of plastic damage in the bearing ***,samples subjected to higher strain-controlled loading exhibit higher plastic strain energy and shorter fatigue ***,strain localization is identified as the predominant damage mechanism in cyclic shear fatigue of the bearing steel,which accumulates and ultimately results in fatigue ***,simulation results also revealed the microstructural reasons for the strain localization(e.g.,BCC phase transformation into FCC and HCP phase),which well explained the formation of white etching *** study provides fresh atomic-scale insights into the mechanisms of cyclic shear fatigue damage in bearing steels.

关键词： Cyclic shear fatigue Molecular dynamic simulation Bearing steels Plastic damage accumulation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

半潜式平台两种锚泊系统的疲劳损伤比较计算

振动与冲击 2014年第13期33卷 1-5,25页

作者：乔东生欧进萍大连理工大学深海工程研究中心大连116024 大连理工大学海岸和近海工程国家重点实验室大连116024

以某座半潜式平台为研究对象,分别对其配置两种具有相同静恢复力特性的锚泊系统,其中锚泊线组成分别为钢链-钢索-钢链和钢链-聚酯纤维系缆-钢链。首先建立半潜式平台及其锚泊系统的耦合数值计算模型,以中国南海S4海域的海况条件作为环... 详细信息

以某座半潜式平台为研究对象,分别对其配置两种具有相同静恢复力特性的锚泊系统,其中锚泊线组成分别为钢链-钢索-钢链和钢链-聚酯纤维系缆-钢链。首先建立半潜式平台及其锚泊系统的耦合数值计算模型,以中国南海S4海域的海况条件作为环境荷载,计算锚泊线在各短期海况下的张力时程曲线;然后采用雨流法对其计数得到对应于各短期海况条件下的疲劳载荷谱;最后根据Miner线性累积损伤模型,对两种锚泊系统在长期海况条件下的疲劳损伤进行比较计算。

关键词：锚泊系统雨流计数短期海况疲劳损伤